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Consider the following statements:
I. Catalyst converters are fitted into automobiles for reducing emission of poisonous gases.
II. They convert unburnt hydrocarbons to $C{O}_2 and H_{2}O and CO$ and NO to $C{O}_2 and N_2$ respectively.
III. Vehicles equipped with catalytic converter should use leaded petrol.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III

Consider the following statements:
I. Nature selects for fitness.
II. Fitness is based on characteristics that are inherited.
III. Fitness is the end result of the ability to adapt and get selected by nature.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III 

Consider the following statements:
I. The largest known human gene is dystrophin at 2.4 million bases
II. Repeated sequences make up very large portion of the human genome
III. There are about 2.4 million locations where single base DNA differences occur in humans
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. RNA is the genetic material of the QB bacteriophage
II. DNA chemically is less reactive and more stable than RNA
III. Viruses having RNA genome and having shorter life span mutate & evolve slowly.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements
In prokaryotes
I. Photosynthetic lamellae may be present in photosynthetic bacteria
II Flagella is made of flagellin and 9+2 organization is absent
III. Cytoplasmic streaming is observed but microtubules are absent
Which of the above statements are true?
1. I and II only
2. I and III only
3.II and III only
4. I, II and III

Consider the following statements:
I. People affected by phenylketonuria are unable to convert tyrosine to phenylalanine.
II. Alzheimer's disease results from accumulation of amyloid protein plaques in the brain.
III. Klinefelter's and Turner's syndromes are the result of non disjunction of the sex chromosomes in either of sexes.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
 

Consider the following statements:
I. Cells that do not divide frequently have a longer G1 phase
II. The cell in the $G_0$ phase is considered to be withdrawn from cel cycle
III. A cell in $G_0$, if decides to divide, enters S phase to replicate its DNA.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. An asymmetric karyotype is considered as a primitive feature.
II. Lampbrush chromosomes occur at diplotene stage in the primary oocyte nuclei of most animal species, except mammals.
III. Polytene chromosomes occur in some cells of the dipteran larvae
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
Regarding plant mineral nutrition
I. The deficiency symptoms of nitrogen, potassium and magnesium are visible first in senescent leaves
II. Manganese inhibits calcium translocation in shoot apex
III. Lack or low level of N, K, S, Mo causes an inhibition of cell division
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The apoplast system is continuous throughout the plant, except at the casparian strips of the endodermis.
II. Transport proteins of endodermal cells are control points, where a plant adjusts the quantity and type of solute that reaches the xylem.
III.A $C_4$ plant loses about twice as much water as a $C_3$ plant for the same amount of $C{O}_2$ fixed.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?

Consider the following statements:
Regarding C4 photosynthesis plants-
l. PEP is primary ${\mathrm{CO}}_2$ acceptor.
ll. OAA is primary ${\mathrm{CO}}_2$ fixation product.
lll. RuBisCO is not present in these plants.
Which of the above statements are true?
1. l and ll only
2. l and lll only
3. ll and lll only
4. l, ll and lll

Consider the following statements:
Regarding fermentation of glucose -
l. There is a partial breakdown of glucose
ll. There is no gain of ATP
lll. NADH is oxidized to NAD${}^{+}$ slowly
Which of the above statements are true?
1. l and ll only
2. l and lll only
3. ll and lll only 
4. l, ll and lll

Consider the following statements:
Regarding growth in plants -
l. Cell enlargement requires water.
ll. Oxygen helps in releasing metabolic energy for growth activities.
lll. Nutrients are required for synthesis of protoplasm and act as source of energy.
Which of the above statements are true?
1. l ans ll only
2. l and lll only
3. ll and lll only
4. l, ll and lll

Consider the following statements:
I. The common bile duct is guarded by the sphincter of Oddi.
II. Lower esophageal sphincter is also called as the cardiac sphincter
III.The external anal sphincter is under our voluntary control
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements
I. Trypsinogen is activated by enterokinase
II. Goblet cells secrete mucus
III. Bile pigments help in emulsification of fats
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements :
I. The diffusing capacity of ${\mathrm{CO}}_2$ across the respiratory membrane is higher than that of ${\mathrm{O}}_2$
II. The presence of Hb increases the efficiency of ${\mathrm{O}}_2$ transport about 10 times.
III. Carbon monoxide binds to Hb with much more tenacity with respect to ${\mathrm{O}}_2$ 
Which of the above statements are true ?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III

Consider the following statements:
I. Heparin can be used as anticoagulant both in-vivo and in vitro
II. Plasmin prevents thrombus formation.
III. Lack of factor Vill causes hemophilia B
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. 70% of ventricular filling is due to passive opening of AV valves
II. Lub is caused by simultaneous closure of both the AV valves
III. Dub is caused by simultaneous closure of both the semilunar valves
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements :
I. Many bony fishes, aquatic amphibians, and aquatic insects are ammonotelic.
II. Mammals, many terrestrial amphibians, and cartilaginous fishes are ureotelic.
III. Reptiles, birds, land snails, and insects are uricotelic.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements :
I. The DCTs of many nephrons open into the collecting duct
II. In cortical nephrons, loop of Henle is short and does not extend into medulla 
III. Vasa recta is absent or highly reduced in cortical nephrons
Which of the above statements are true ?
1. I and II only
2. I and III only
3. II and III only
4. I,II annd III

Consider the following statements:
I. A motor neuron along with the muscle fibres connected to it constitute a motor unit
II. The neurotransmitter released at the neuro-muscular junction is Acetylcholine.
III. Myosin head has ATPase activity.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Proximal radioulnar joint is a type of ellipsoidal joint.
II. The first carpo-metacarpal joint is a saddle joint.
III. Gleno-humeral joint is a ball and socket joint.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III

Consider the following statements:
I. Somatic neural system relays impulses from CNS to skeletal muscles.
II. Autonomic neural system transmits impulses from CNS to involuntary organs and smooth muscles.
III. Unmyelinated nerve fibres are commonly found in spinal and cranial nerves.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Acetylcholine is released at the electric synapse.
II. Electric synapses are faster.
III. It is more difficult to regulate an electric synapse with respect to a chemical synapse.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III

Consider the following statements:
I. The rate of production of organic matter during photosynthesis is called as gross primary productivity of an ecosystem.
II. The available biomass for the consumption of heterotrophs is called secondary productivity
III. The low productivity of the oceans can mainly be attributed to limited availability of nitrogen
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
The rate is decomposition is high if:
I. The detritus is rich in lignin and chitin.
II. The detritus is rich in nitrogen and sugars
III. The environmental conditions are warm and moist
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. In an aquatic ecosystem, GFC is the major conduit for energy flow.
II. In a terrestrial ecosystem, DFC is the major conduit for energy flow
III. GFC and DFC are not interconnected at any level
Which of the above statements are true
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements
I. Trophic level in an ecosysten represents a functional level, not a species as such
II. Saprophytes are accorded the position of a top consumer in an ecosytem
III. A species can occupy more than one trophic level in the same ecosystem at the same time
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The atmosphere only contains about 1 % of total global carbon
II. Unlike carbon cycle, there is no respiratory release of phosphorus into atmosphere.
III. Sulphur and phosphorus cycles are sedimentary cycles
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The extinction of stellar's cow and passenger pigeon is attributed to over-exploitation.
II. The thylacine was the largest known carnivorous marsupial of modern times.
III. Alien species invasion has led to extinction of many cichlid fish species in lake Victoria.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III

Consider the following statements:
I. The male barrier contraceptives afford protection against STDs.
II. OCPs are the contraceptive method used most commonly by the urban women in India.
III. Then second generation IUDs release copper and the third generation IUDs release hormones.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Platyhelminths are acoelomates and use protonephridia as excretory structures.
II. Aschelminthes are pseudocoelomates and have bilateral symmetry.
III. Adult echinoderms show radial symmetny and exhibit deuterostome type embryonic development.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The members of Phylum Porifera are exclusively marine.
II. Ctenophores are the largest animals that use cilia for locomotion.
III. Nematodes include highly successful parasites but unable to infect plants.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
Chordates-

Which of the above statements are true?
1 I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The first organisms that invaded land were the plants
II. Lobefins evolved into first amphibians.
III. Ramapithecus was monre ape-like and Dryopithecus was more man-like.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
Gymnosperms-
I. Are plants in which the ovules remain exposed, both before and after fertilization.
II. Have male and female gametophytes that have independent free-living existence.
III. Are heterosporous.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Noise was added as a pollutant to Air (Prevention and Control of Pollution Act in 1987)
II. Montreal protocol was signed in 1987 to control emission of ozone depleting substances
III. The Earth Summit for conservation of biodiversity and sustainable utilisation of its benefits was held in 1992
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The "bad ozone is the ozone that is formed in the troposphere.
II. The "good ozone" in stratosphere acts as shield against harmful UV radiations.
III. UV-A radiations can cause skin cancers and snow-blindness cataract.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
 

Which of the above statements are true?

Consider the following statements:
I. When certain exotic species are introduced into a geographical area, they become invasive because the invaded land does not have its natural predators.
II. Competition is best defined as a process in which the fitness of one species is significantly lower in the presence of another species.
III. Biological control methods adopted in agricultural pest control are based on the ability of the predator to regulate prey population
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. In animal cells, lipid like steroidal hormones are synthesized in SER
II. Golgi apparatus is the important site for formation of glycoproteins & glycolipids.
III. Lysosomes carry alkaline hydrolaşes.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The axonemal arrangement of microtubules in cilia is 9+0.
II. The centrioles form the basal body of cilia and flagella and spindle fibers
III. Larger and more numerous nucleoli are present in cells carrying out protein synthesis.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?

Consider the following statements:

Which of the above statements are true?

Consider the following statements:
In a monocot stem-

Which of the above statements are true?

Consider the following statements about dicot leaf:

Which of the above statements are true?

Consider the following statements:
With respect to secondary growth in dicot root-

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. In custard apple, the fruit is Etaerio of berries.
II. In wheat the fruit is caryopsis
III. In pineapple the fruit is Heperidium
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
Regarding genetic drift

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Inheritance of a character is affected by promoter and regulatory sequences of a structural gene.
II. The split-gene arrangement represents an ancient feature of the genome.
III. The process of splicing represents the dominance of RNA world.
which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. All the reference point while defining a transcription unit is made with coding strand
II. It is the presence of a promoter in a transcription unit that also defines the template and coding strands
III. Exons are said to be sequences that do not appear in mature or processed RNA
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Deoxyribonucleoside triphosphates act as substrates as well as provide energy for polymerization reaction during DNA replication.
II. The replication of DNA is both semiconsenvative and semi- discontinuous
III. In bacterial DNA replication there are multiple ori and replication fork moves bi-directionally
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. If we put them through test cross, all homozygous dominant combinations will breed true but heterozygous genotypes will follow the segregation.
II. Two gene interactions such as epistasis do not follow the Menedelian principle of segregation.
III. In any diploid individual, only two alleles can be found, so multiple alleles can be detected only in a population.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Y chromosome determines maleness in humans and other mammals.
II. Sex-linked recessive characters are more commoniy seen in the males of the species.
III. In birds and butterflies, males are XX and females are XY.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Philadelphia chromosome is characteristically seen in Chronic Myeloid Leukemia.
II. Inversions are used to maintain balanced lethal systems.
III. It was actually a series of reciprocal translocations that was observed by Hugo de Vries in evening primrose
which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The unequivocal proof of DNA being the genetic material was given by Hershey and Chase.
II. Meselson and Stahl proposed that DNA replication is semi- conservative
III. Beadie and Tatum proposed the one -gene one-enzyme hypothesis.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements
I. Biolistics or gene gun can be used to introduce penes in both plant and animal cells
II. Agrobacterium tumefociens does not naturally infect Monocots.
III. Liposomes are used in the gene therapy for cystic fibrosis.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements :

Which of the above statements are true ?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III

Consider the following statements:
I. Humulin is the first therapeutic recombinant product approved for human use
II. Flavr savr is the first GM food approved for human use
III. Bacillus thuringiensis is the first bio-insect
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The VNTRs belong to a class of satellite DNA called as mini- satellite.
II. Southern blotting is the transfer of DNA fragments to a filter cellulose membrane
III. VNTRs are used in DNA fingerprinting as they do not show any variations and are not inherited.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Morphine is clinically used as an analgesic and its receptors are located in CNS and GIT.
II. Cocaine and amphetamines are CNS stimulants and the later is used clinically to treat narcolepsy and morbid obesity.
III. Atropine is a parasympathomimetic drug used to dilate pupil and increase heart rate.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. Cancer is essentially a genetic disease caused by multiple mutational events.
II. Cancerous cells are rapidiy dividing cells that exhibit contact inhibition.
III. Metastasis is the most feared complication of any cancer
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
 

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:

Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements :

1. I and II only
2. I and III only
3. II and III only
4. I,II and III

Consider the following statements:
I. In prokaryotes, control of the rate of transcriptional initiation is the predominant site for control of gene expression.
II. Regulation of lac operon by CAP is referred to as negative regulation.
III. The inducer of lac operon is lactose
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Consider the following statements:
I. The cellular factory responsible for synthesizing proteins is the ribosome.
II. The ribosome also acts as a catalyst for the formation of peptide bond.
III. The UTRs (untranslated regions) in an mRNA are not required for translation
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III onlt
4. I, II and III

Consider the following statements:

Which of the following statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Which of the following compounds possess the maximum number of sp-hybridised carbon atoms?
1. ${\left(CN\right)}_2$
2. $C{H}_2=C=CH-CN$
3. $HC\equiv C-C{H}_2-CH=C=C=C{H}_2$
4. $HC\equiv C-CN$

The Xe atom in $XeO{F}_4$ involves the hybridisation
1. $s{p}^3$
2. $s{p}^{3}d$
3. $s{p}^3{d}^2$
4. $s{p}^3{d}^3$

Which of the following 0.1 M aqueous solutions will exert the highest osmotic pressure?
1. NaCl
2. $BaC{l}_2$
3. $MgS{O}_4$
4. $A{l}_2{(SO}_{}$₄)3

For which of the following reactions Entropy change is negative?
1. $Mg\left(s\right)+C{l}_2\left(g\right)\to MgC{l}_2\left(s\right)$
2. $H_{2}O\left(l\right)\to H_{2}O\left(g\right)$
3. $CaC{O}_3\left(s\right)\to CaO\left(s\right)+C{O}_2\left(g\right)$
4. $I_2\left(g\right)\to 2I\left(g\right)$

$F{e}_2{O}_3$ is reduced to spongy iron near the top of the blast furnace by
1. CO
2. $C{O}_2$
3. C
4. $CaC{O}_3$

Thermodynamically, the most stable form of phosphorus is
1. White
2. Yellow
3. Red
4. Black

Which of the following complex ion will have the maximum number of unpaired electrons?
1. [CrCl₆]^3-
2. [Cr(H₂O)₆]³⁺
3. [Cr(CN)₆]^3-
4. All have the same

Which of the following carbonyl compounds undergoes self-redox reaction in the presence of a concentrated base?
1. 3-Methylpentanal
2. 2-Chlorobutanal
3. 2,2-Dimethylpropanal
4. tert-butylmethyl ketone

Polyethene, PVC, teflon and neoprene are example of -
1. Homopolymer.
2. Addition hetropolymer.
3. Biodegradable polymer.
4. Copolymer.

The chemical added to soaps to impart antiseptic properties is : 
1. Salvarsan
2. Bithional
3. Paracetamol
4. Iodine

Which of the following elements has the highest IE?
1. B
2. Al
3. Ga
4. In

Arrange $H_{2}O, HC\equiv CH, N{H}_3, C{H}_3 C{H}_3$ in order of acidity
1. $H_{2}O>HC\equiv CH>N{H}_3>C{H}_{3}C{H}_3$
2. $HC\equiv CH>H_{2}O>N{H}_3>C{H}_3-C{H}_3$
3. $C{H}_{3}C{H}_3>HC\equiv CH>N{H}_3>H_{2}O$
4. $H_{2}O>N{H}_3>HC=CH>C{H}_3-C{H}_3$

The wrong statement about photochemical smog is-
1. Photochemical smog causes irritation in eyes.
2. It has a low concentration of oxidizing agents
3. It can be controlled by controlling the release of ${\mathrm{NO}}_2$, hydrocarbon, ozone, etc.
4. Plantation of some plants helps in controlling photochemical smog.

Boric acid is an acid because its molecule 
1. Contains replaceable $H^{+}$ ion
2. Gives up a proton
3. Accepts $O{H}^{-}$ from water-releasing proton
4. Combines with proton from water molecule

$C{H}_{3}COOH\stackrel{LiAl{H}_4}{\to }P\stackrel{SOC{l}_2}{\to }Q\stackrel{\stackrel{14}{K}CN}{\to }R\stackrel{H_2{O}^{+}}{\to }X, \text{'}X\text{'} is$
1. $C{H}_{3}COOH$
2. $C{H}_{3}C{H}_2\stackrel{14}{C}OOH$
3. $C{H}_3\stackrel{14}{C}OOH$
4. $C{H}_{3}C\stackrel{14}{H_2}CHO$

Which compound does not give $N{H}_3$ on heating?
1. (NH₄)₂SO₄
2. (NH₄)₂CO3
3. NH₄NO₂
4. NH₄Cl

The magnetic moments of complexes given below are in the order
(I) $\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$
(II) ${\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{4-}$
(III) ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$
(IV) ${\left[{\mathrm{CoF}}_6\right]}^{3-}$
1. I < II < III < IV
2. I < III < IV < II
3. IV > II > I > III
4. IV < II < I < III

Heating of ammonium dichromate produces
1. ${\mathrm{NH}}_3,{\mathrm{Cr}}_2{\mathrm{O}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{O}$
2. ${\mathrm{N}}_2,{\mathrm{Cr}}_2{\mathrm{O}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{O}$
3. $\mathrm{NO}, {\mathrm{CrO}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{O}$
4. ${\mathrm{N}}_2\mathrm{O},{\mathrm{CrO}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{O}$

Product Y  is 
1.
2. 
3. 
4. 

Which of the following does not undergo periodic oxidation?
1. 
2. 
3. 
4. 

9.2 mg of an organic compound (A) reacts with excess $C{H}_{3}C{H}_{2}MgBr$ to give 6.72 mL of a gas at STP. What is the number of active present in the compound (A) if its mol. wt. is 92.
1. 2
2. 3
3. 5
4. 7

(1) 
(2) 
(3) 
(4) 

Arrange the following complexes in the order of decreasing electrical conductivity.
I. $\left[{\mathrm{CoCl}}_3{\left({\mathrm{NH}}_3\right)}_3\right]$
II. $\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]{\mathrm{Cl}}_2$
III. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$
IV. $\left[{\mathrm{CoCl}}_2{\left({\mathrm{NH}}_3\right)}_4\right]\mathrm{Cl}$
1. III >II >IV > I
2. II > III > IV > I
3. II > III > I > IV
4. III > IV > II > I

Which of the following has the lowest pKa value?
1. Picric acid
2. p-Nitrophenol
3. Ethyl alcohol
4. Acetylene

Which of the following orders is incorrect with respect to the property mentioned for each?
1. \(\mathrm{NO}^{-}~>~\mathrm{NO}~{>}~ \mathrm{NO}^{+}~ \text {(bond length) }\)
2. \(\mathrm{H}_2>\mathrm{H}_2^{+}>\mathrm{He}_2^{+}~ \text {(bond energy) }\)
3. \(\mathrm{O}_2^{2-}>\mathrm{O}_2>\mathrm{O}_2^{2+} \text { (paramagnetic moment) }\)
4. ${}_{}^{}$\(\mathrm{NO}_2^{+}>\mathrm{NO}_2>\mathrm{NO}_2^{-} ~\text {(bond angle) }\)

A solution which is 10 M each in Mn²⁺, Fe²⁺, Zn²⁺, and Hg²⁺ is treated with 10^-16 M sulfide on the ion. If K of MnS, FeS, ZnS, and HgS are 10^-15, 10^-23, 10^-20, and 10^-54 respectively which one will precipitate first:
1. FeS
2. MgS
3. HgS
4. ZnS

Nylon 6,6 is a strong crystalline fibre due to the presence of intermoleculer forces which are :
1. H-bond
2. covalent bonds
3. van der Walls' attractive forces
4. ionic bonds

The unit cell edge length for LiCl (NaCl type structure) is 5.14 Å. Assuming anion cation contact, calculate the ionic radius for chloride ion:
1. 1.815 Å
2. 3.63 Å
3. 2.75 Å
4. 5.14 Å

Nitrogen dioxide cannot be obtained from:
1. $\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2$
2. $\mathrm{Hg}{\left({\mathrm{NO}}_3\right)}_2$
3. ${\mathrm{NaNO}}_3$
4. ${\mathrm{AgNO}}_3$

$\mathrm{Benzene} +\hspace{0.17em}\mathrm{ICI} \stackrel{{\mathrm{AlCl}}_3}{\to } \mathrm{A}, \mathrm{A} \mathrm{is}$
1. 
2. 
3. 
4. 

The equivalent weight of $F{e}_2{S}_3$ in the reaction is
${\mathrm{Fe}}_2{\mathrm{S}}_3+5{\mathrm{O}}_2\to 2{\mathrm{FeSO}}_4+{\mathrm{SO}}_2$
1. M/16
2. M/4
3. M/20
4. M/10

Number of P - O - P bond and hybridization of each P & O atom in P₄O₆ are.
1. 6, sp³
2. 12, dsp²
3. 6, dsp²
4. 4, sp³

The compound (SiH₃)₃N is expected to be: 
1. Pyramidal and more basic than (CH₃)₃N
2. Planar and less basic than (CH₃)₃N
3. Pyramidal and less basic than (CH₃)₃N
4. Planar and more basic than (CH₃)₃N

In which case formation of butanenitrile is possible?
1. ${\mathrm{C}}_3{\mathrm{H}}_3\mathrm{Br}+\mathrm{KCN}$
2. ${\mathrm{C}}_4{\mathrm{H}}_9\mathrm{Br}+\mathrm{KCN}$
3. ${\mathrm{C}}_3{\mathrm{H}}_7\mathrm{OH}+\mathrm{KCN}$
4. ${\mathrm{C}}_4{\mathrm{H}}_9\mathrm{OH}+\mathrm{KCN}$

m-chlorobenzaldehyde on reaction with conc. KOH at room temperature gives
1. potassium m-chlorobenzoate and m-hydroxy benzaldehyde
2. m-hydroxy benzaldehyde and m-chlorobenzyl alcohol
3. m-chlorobenzyl alcohol and m-hydroxy benzyl alcohol
4. potassium m-chlorobenzoate and m chlorobenzyl alcohol

The structure of glycine (amino acid) (Zwitter ion) select the correct statement of the following.
1. Glycine, as well as other amino acids are amphoteric.
2. The acidic functional group in amino acids is $- \stackrel{+}{\mathrm{N}}{\mathrm{H}}_3$
3. The basic functional group in amino acids is $- {\mathrm{CO}}_2^{-}$
4. All the statements are correct .

The resistance of a conductivity cell containing 0.0001 M KCl solution at 298 Kis 1500$\mathrm{\Omega }$. What is the cell constant if the conductivity of 0.001 M KCl solution at 298 K is 0.146 x 10^-3 S cm^-1
1. 0.600 cm^-1
2. 0.219 cm^-1
3. 0.995 cm^-1
4. 0.790 cm^-1

One mole of gas expands with temperature as V = KT^2/3. What is the work done when temperature changes by 30°C
1. 10R
2. 20R
3. 30R
4. 40R

A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity $\omega$. Two objects each of the mass m are attached gently to the opposite ends of a diameter of the ring. The ring will now rotate with an angular velocity
(1) $\omega (M-2m)/(M+2m)$
(2) $\omega M/(M+2m)$
(3) $\omega M/(M+m)$
(4) $\omega (M+2m)/M$

Three identical bodies of equal mass M each are moving along a circle of radius R under the action of their mutual gravitational attraction The speed of each body is:
1. $\sqrt{\frac{\mathrm{GM}}{\mathrm{R}}}$
2. $\sqrt{\frac{\mathrm{GM}}{3\mathrm{R}}}$
3. $\sqrt{\frac{\mathrm{GM}}{\sqrt{3}\mathrm{R}}}$
4. $\sqrt{\frac{\mathrm{GM}}{\sqrt{2}\mathrm{R}}}$

A point Q lies on the perpendicular bisector of an electrical dipole of  dipole moment p. If the distance of Q from the dipole is r ( much larger than the size of the dipole), then electric field at Q is proportional to? 
1. $p^{-1}$ and $r^{-2}$
2. p and $r^{-2}$
3. $p^2 and r^{-3}$
4. p and $r^{-3}$

Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1 m and 1000 turns at the centre of the coil is
(1) 2 x 10^{-1 T}
(2) 4.31 x 10^{-2 T}
(3) 6.28 x 10^{-4 T}
(4) 9.81 x 10^-4 T

$\mathrm{Standing} \mathrm{waves} \mathrm{are} \mathrm{produced} \mathrm{in} \mathrm{a} 10 \mathrm{m} \mathrm{long} \mathrm{stre}tc\mathrm{hed} \mathrm{string}. \mathrm{If} \mathrm{the} \mathrm{string} \mathrm{vibrates}$
$\mathrm{in} 5 \mathrm{segements} \mathrm{and} \mathrm{the} \mathrm{wave} \mathrm{velocity} \mathrm{is} 20\mathrm{m}/\mathrm{s}, \mathrm{the} \mathrm{frequency} \mathrm{is}:$
$\left(1\right) 10 \mathrm{Hz} \left(2\right) 5 \mathrm{Hz}$
$\left(3\right) 4 \mathrm{Hz} \left(4\right) 2 \mathrm{Hz}$

Plancks' constant has the dimensions of
(1) linear momentum
(2) angular momentum
(3) energy
(4) power

A wire of length L having tension T, radius R vibrates with natural frequency n. Another wire of the same metal with length 2L having tension 2T and radius 2R shall vibrate with the natural frequency 
1. n
2. 2n
3. $\frac{4\mathrm{n}}{\sqrt{2}}$
4. $\frac{\mathrm{n}}{2\sqrt{2}}$

The density of a cube is measured by measuring its mass and length of its sides. if the maximum error in the measurement of mass and length is 4% and 3% respectively, the maximum error in the measurement of density will be
(1) 7%
(2) 9%
(3) 12%
(4) 13% 

Two simple harmonic motions are given by X = Asin($\mathrm{\omega }$t+$\mathrm{\delta }$) and $\mathrm{y} = \mathrm{A} \sin \left(\mathrm{\omega t} + \mathrm{\delta } + \frac{\mathrm{\pi }}{2}\right)$ act on a particle simultaneously, then the motion of the particle will be
(1) circular anti-clockwise
(2) circular clockwise
(3) elliptical anti-clockwise
(4) elliptical clockwise

The velocity of sound in a gas is inversely proportional to the mⁿ where m is its molecular weight. Then, the value of n=
(1) 1
(2) 0.5
(3) 1.5
(4) 2

There is a flat uniform triangular plate ABC such that AB = 4 cm, BC = 3 cm and $\angle$ABC = 90° as shown in fig. The moment of inertia of the plate about AB, BC, and CA as the axis is respectively, I₁, I₂, and I₃. Which of the following is true? 

1. I₃ > I₂
2. I₂ > I₁
3. I₃ > I₁
4. I₃ > I₂
 

A coil of one turn is made of a wire of certain length and then from the same length, a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic induction at their centres will be
(1) 2:1
(2) 1:4
(3) 4:1
(4) 1:2 

If y be the ratio of specific heats of a perfect gas, the number of degrees of freedom of a molecule of the gas is 
1. $\frac{25}{2}(\mathrm{\gamma }-1)$
2. $\frac{3\mathrm{\gamma }-1}{2\mathrm{\gamma }-1}$
3. $\frac{2}{\mathrm{\gamma }-1}$
4. $\frac{9}{2}(\mathrm{\gamma }-1)$

A simple pendulum of length has a bob of mass m, with a charge q on it. A vertical sheet of charge, with surface charge density o passes through the point of suspension. At equilibrium, the spring makes an angle with the vertical. Its time period of oscillations is T in this position. Then 
1. $\tan \mathrm{\theta }=\frac{\mathrm{\sigma q}}{2{\mathrm{\epsilon }}_0\mathrm{mg}}$
2. $\tan \mathrm{\theta }=\frac{\mathrm{\sigma q}}{{\mathrm{\epsilon }}_0\mathrm{mg}}$
3. $\mathrm{T}>2\mathrm{\pi }\sqrt{\frac{\mathrm{\ell }}{\mathrm{g}}}$
4. $\mathrm{T}=2\mathrm{\pi }\sqrt{\frac{\mathrm{\ell }}{\mathrm{g}}}$

Gases begin to conduct electricity at low pressure because
(1)  at low pressures gases turn to plasma
(2)  colliding electrons can acquire kinetic energy due to increased mean free path leading to ionisation of atoms
(3)  atoms break up into electrons and protons
(4)  the electrons in atoms can move freely at low pressure

An electron is travelling horizontally towards east. A magnetic field in vertically downward direction exerts a force on the electron along
(1) East
(2) West
(3) North
(4) South

In the network shown, the current flowing through the battery of negligible internal resistance is
                       
1.  $\frac{5}{20}$A
2.  $\frac{5}{32}$A
3.  $\frac{5}{40}$A
4.  $\frac{5}{50}$A

The figure shows a process on a gas in which pressure and volume both change. The molar heat capacity for this process is C. Then
 
(1) C=0
(2) C=$C_V$
(3) C>$C_V$
(4) C<$C_V$

Variation in electric potential is maximum if one goes :
1. along the line of force
2. perpendicular to the line of force
3. in any direction
4. no variation in any direction

If a solid sphere is rolling, the ratio of its rotational energy to the total kinetic energy is given by:
1.  7:10
2.  2:5
3.  10:7
4.  2:7

The potential function of an electrostatic field is given by V = 2x². Determine the electric field strength at the point (2 m, 0,3 m)
1. $\overrightarrow{E}=4\hat{i}\left(N{C}^{-1}\right)$
2. $\overrightarrow{E}=-4\hat{i}\left(N{C}^{-1}\right)$
3. $\overrightarrow{E}=8\hat{i}\left(N{C}^{-1}\right)$
4. $\overrightarrow{E}=-8\hat{i}\left(N{C}^{-1}\right)$

P-V diagram of an ideal gas is as shown. Find work done by the gas in the ABCD process:

1. 4${\mathrm{P}}_0{\mathrm{V}}_0$
2. 2${\mathrm{P}}_0{\mathrm{V}}_0$
3. 3${\mathrm{P}}_0{\mathrm{V}}_0$
4. ${\mathrm{P}}_0{\mathrm{V}}_0$

A particle starts simple harmonic motion from the mean position. Its amplitude is A and time period is T. What is its displacement when its speed is half of its maximum speed?
1. $\frac{\sqrt{2}}{3}\mathrm{A}$
2. $\frac{\sqrt{3}}{2}\mathrm{A}$
3. $\frac{2}{\sqrt{3}}\mathrm{A}$
4. $\frac{A}{\sqrt{2}}$

The value of critical temperature in terms of Vander Waal's constants a and b is given by 
1. ${\mathrm{T}}_{\mathrm{c}}=\frac{\mathrm{a}}{2\mathrm{Rb}}$
2. ${\mathrm{T}}_{\mathrm{c}}=\frac{\mathrm{a}}{27\mathrm{Rb}}$
3. ${\mathrm{T}}_{\mathrm{c}}=\frac{8\mathrm{a}}{27\mathrm{Rb}}$
4. ${\mathrm{T}}_{\mathrm{c}}=\frac{17\mathrm{a}}{8\mathrm{Rb}}$

Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially, the sample of A and B have an equal number of nuclei. After 80 minutes the ratio of the remaining number of A and B nuclei is
(1) 1:16
(2) 4:1
(3) 1:4
(4) 1:1 

A ring is made of a wire having a resistance R₀ =12 ohms. Find the points A and B as shown in the figure at which a current-carrying conductor should be connected so that the resistance R of the subcircuit between these points is equal to  8/3 ohm:

1. $\frac{{\mathrm{\ell }}_1}{{\mathrm{\ell }}_2}=\frac{3}{8}$
2. $\frac{{\mathrm{\ell }}_1}{{\mathrm{\ell }}_2}=\frac{1}{2}$
3. $\frac{{\mathrm{\ell }}_1}{{\mathrm{\ell }}_2}=\frac{5}{8}$
4. $\frac{{\mathrm{\ell }}_1}{{\mathrm{\ell }}_2}=\frac{1}{3}$

A wire of area of cross-section 10^-6m² is increased in length by 0.1%. The tension produced is 1000N. The Young's modulus of wire is:
1. 10¹² N/m²
2. 10¹¹ N/m²
3. 10¹⁰ N/m²
4. 10⁹ N/m²

An organ pipe of length L open at both ends is found to vibrate in its first harmonic when sounded with a tuning fork of frequency 480 Hz. What should be the length of a pipe closed at one end, so that it also vibrates in first harmonic with the same tuning fork?
1.  $\frac{\mathrm{L}}{4}$
2.  $\frac{\mathrm{L}}{2}$
3.  L
4.  2L

An ionic compound ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$ occurs is of fcc type crystal structure with B ion at the center of each face and A ion occupying corners of the cube. Give the formula ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$
1. ${\mathrm{AB}}_3$
2. ${\mathrm{AB}}_4$
3. ${\mathrm{A}}_3\mathrm{B}$
4. ${\mathrm{A}}_4\mathrm{B}$

During electrolysis, 2A current is passed through an electrolytic solution for 965 s. The number of moles of electrons passed will be
1. 0.02
2. 0.01
3. 200
4. 0.037

$\mathrm{Zn}\left|{\mathrm{Zn}}^{2+}\left({\mathrm{C}}_1\right)\right|\left|{\mathrm{Zn}}^{2+}\left({\mathrm{C}}_2\right)\right|\mathrm{Zn}$. For this cell $∆\mathrm{G}$ is negative
1. ${\mathrm{C}}_1={\mathrm{C}}_2$
2. ${\mathrm{C}}_1>{\mathrm{C}}_2$
3. ${\mathrm{C}}_2>{\mathrm{C}}_1$
4. None of these

In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is 
1. 7.5 min
2. 15 min
3. 30 min
4. 60 min

The emf of the cell $\mathrm{Cu}\left(\mathrm{s}\right)\left|{\mathrm{Cu}}^{2+}\left(1 \mathrm{M}\right)\right|\left|{\mathrm{Ag}}^{+}\left(1 \mathrm{M}\right)\right|\mathrm{Ag}$  is 0.46 V.
Given ${\mathrm{E}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}^0$ =  0.80 v
1. -0.34 V
2. 1.26 V
3. -1.26 V
4. 0.34 V

20 g of chlorine are evolved in 6 hour from sodium chloride solution by the current of 
1. 5 ampere
2. 10 ampere
3. 2.5 ampere
4. 50 ampere

In a solid AB having NaCl structure, 'A' atoms occupy fcc lattice. If all the face centered atoms along one of the axes are removed then the resultant stoichiometry of the solid is 
1. ${\mathrm{AB}}_2$
2. ${\mathrm{A}}_2\mathrm{B}$
3. ${\mathrm{A}}_4{\mathrm{B}}_3$
4. ${\mathrm{A}}_3{\mathrm{B}}_4$

In a double slit experiment to find the separation between slits by displacement method, the separation of images of slits were found to be 16 mm and 9 mm respectively, the actual separation between slits will be 
1. 12.5 mm
2. 12 mm
3. 3.5 mm
4. 144 mm

An opaque disc is placed on the surface of a pond with refractive index = $\frac{5}{3}$, over a point source in liquid at a depth of 4 m. The smallest radius of the disc, so that no light is escaped from liquid is
1. 4 m
2. 3 m
3. $\infty$
4. 5 m

The magnetic field perpendicular to the plane of a conducting ring of radius r changes at the rate dB/dt. Then
1. the potential difference between diametrically opposite points on the ring is half of the induced emf
2. the emf induced in the ring is $2\mathrm{\pi r} \mathrm{dB}/\mathrm{dt}$
3. all the points on the ring are at the same potential 
4. none of the above

Light enters at an angle of incidence in a transparent rod of a refractive index n. For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidence?
1. n > $\sqrt{2}$
2. n = 1
3. n = 1.1
4. n = 1.3

In the circuit given in figure, ${\mathrm{A}}_1 \mathrm{and} {\mathrm{A}}_2$ are ammeters. Just after key K is pressed to complete the circuit, the reading will be 

1. zero in both ${\mathrm{A}}_1 \mathrm{and} {\mathrm{A}}_2$
2. maximum in both ${\mathrm{A}}_1 \mathrm{and} {\mathrm{A}}_2$
3. zero in ${\mathrm{A}}_1$,maximum in ${\mathrm{A}}_2$
4. maximum in ${\mathrm{A}}_1$, zero in ${\mathrm{A}}_2$

The Rydberg constant R for hydrogen is 
1. $\mathrm{R}=-\left(\frac{1}{4{\mathrm{\pi \epsilon }}_0}\right)\frac{2{\mathrm{\pi }}^2{\mathrm{me}}^2}{{\mathrm{ch}}^2}$
2. $\mathrm{R}=\left(\frac{1}{4{\mathrm{\pi \epsilon }}_0}\right)\frac{2{\mathrm{\pi }}^2{\mathrm{me}}^2}{{\mathrm{ch}}^2}$
3. $\mathrm{R}={\left(\frac{1}{4{\mathrm{\pi \epsilon }}_0}\right)}^2\frac{2{\mathrm{\pi }}^2{\mathrm{me}}^2}{{\mathrm{c}}^2{\mathrm{h}}^2}$
4. $\mathrm{R}={\left(\frac{1}{4{\mathrm{\pi \epsilon }}_0}\right)}^2\frac{2{\mathrm{\pi }}^2{\mathrm{me}}^4}{{\mathrm{ch}}^3}$

The electron emitted in beta radiation originates from
1. inner orbits of atoms
2. free electrons existing in nuclei
3. decay of neutron in a nucleus
4. photon escaping from the nucleus

In the given circuit, a switch is in position a. For what value of R(unknown resistance), will circuit have a time constant of 10$\mu s$ ?

1. 2.0 K$\Omega$
2. 2.5 K$\Omega$
3. 1.0 K$\Omega$
4. None of these

A solenoid has an inductance of 60 henry and a resistance of 30 ohms. If connected to a 100-volt battery, how long will it take for the current to reach $\frac{e - 1}{e} \approx 63.2\%$ of its final value?
1.  1 second
2.  2 seconds
3.  e seconds
4.  2e seconds

A series \(R, L,\) and \(C\) circuit is shown here. The source frequency \(f\) is varied, but the current is kept unchanged. Which of the curves shows changes of \(V_C\) and \(V_L\) with frequency that would be valid for the circuit under consideration?
   

1.		2.
3.		4.

Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy gaps represented by \(\left(E_g\right)_C,(E_g)_{Si}~\text{and}~(E_g)_{Ge}\) respectively. Which one of the following relationships is true in their case?
1. \(\left(E_g\right)_C<\left(E_g\right)_{G e} \)
2. \(\left(E_g\right)_C>\left(E_g\right)_{S i} \)
3. \(\left(E_g\right)_C=\left(E_g\right)_{S i} \)
4. \(\left(E_g\right)_C<\left(E_g\right)_{S i}\)

A light ray incident normally on one face of an equilateral prism and emerges out grazingly at the other face. The refractive index of the prism is :
1. $\sqrt{3}$
2. $\sqrt{2}$
3. $\frac{2\sqrt{3}}{5}$
4. $\frac{2}{\sqrt{3}}$

Consider the following statements :

Which of the above statements are true?

Consider the following statements :
I. Asexual reproduction preserves the genetic information while sexual reproduction permits variations.
II. Traditional hybridisation often leads to inclusion and multiplication of undesirable genes along with the desired genes.
III. rDNA technology allows us to isolate and introduce only one or set of desirable genes without introducing undesirable genes in the target organism
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III

Consider the following statements :
I. The uterine endometrium undergoes cyclical changes during the menstrual cycle
II. Estrogen secreted during the pre-ovulatory phase of the menstrual cycle helps in the development of follicle
III. hCG secreted by trophoblast cells helps in the maintaining corpus luteum.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III

Consider the following statements :
I. The primary follicles present at birth carry primary oocytes arrested at meiosis I
II. The secondary oocyte arrested at meiosis II is released at ovulation
III. The second meiotic division is completed by the secondary oocyte just prior to the entry of the sperm into it.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III

A body is moving under the action of two forces $\overrightarrow{{\mathrm{F}}_1}=2\hat{i}-5\hat{j} , \overrightarrow{{\mathrm{F}}_2}=3\hat{i}-4\hat{j}$. Its velocity will become uniform under an additional third force $\overrightarrow{{\mathrm{F}}_3}$, given by :
1. $5\hat{\mathrm{i}}-\hat{\mathrm{j}}$
2. $-5\hat{\mathrm{i}}-\hat{\mathrm{j}}$
3. $5\hat{\mathrm{i}}+\hat{\mathrm{j}}$
4. $-5\hat{\mathrm{i}}+9\hat{\mathrm{j}}$

A ball of mass 3 kg moving with a speed of 100 m/s, strikes a wall at an angle 60$°$(as shown in fig.). The ball rebounds at the same speed and remains in contact with the wall for 0.2 sec, the force exerted by the ball on the wall is 
 
1. $1500\sqrt{3} \mathrm{N}$
2.  1500 N
3. $300\sqrt{3} \mathrm{N}$
4. 300 N