Select incorrect option with respect to sickle cell anaemia:
1. | It is an example of point mutation |
2. | It occurs due to base substitution i.e. transition |
3. | Glumatic acid is replaced by Valine at sixth position in a polypeptide chain |
4. | Mutant haemoglobin molecule undergoes polymerization under low oxygen tension |
1. | -1.5 | 2. | 1.5 |
3. | 0.5 | 4. | 2.5 |
Which one of the following generates new genetic combinations leading to variations?
1. vegetative reproduction
2. parthenogenesis
3. Sexual reproduction
4. Nucellar polyembryony
In 1953, James Watson and F. Crick proposed the Double Helix model of DNA and got Nobel Prize. Their model of DNA was based on:
A. X-ray diffraction of DNA produced by M. Wilkins and R. Franklin
B. Griffith’s experiment.
C. Hershey - Chase experiment
D. Chargaff’s rule of base equivalence (A + G / T + C = 1)
1. A, D
2. A, B, C, D
3. B, C, D
4. A, B, C
The major part of activated sludge is sent to:
1. Anaerobic sludge digesters
2. Aerobic sludge digesters
3. Aeration tank
4. Settling tank
The term 'Nuclein' for the genetic material was used by:
1. Franklin
2. Meischer
3. Chargaff
4. Mendel
Phenomenon in which inheritance of a trait is controlled by two or more genes is known as:
1. Polygenic inheritance
2. Multiple allelism
3. Pleiotropy
4. Co-dominance
A location with luxuriant growth of lichens on the trees indicates that the:-
1. trees are very healthy
2. trees are heavily infested
3. location is highly polluted
4. location is not polluted
1. | Multiple step mutations |
2. | Saltation |
3. | Phenotypic variations |
4. | Minor mutations |
Tailor made plants will supply which of the following alternative resources to industries?
1. Gloden rice
2. Starches
3. Maize
4. Pesticide
Productivity is the rate of production of biomass expressed in terms of:
(i) | (kcal m-3)yr-1 |
(ii) | gm-2 yr-1 |
(iii) | g-1 yr-1 |
(iv) | (kcal m-2)yr-1 |
1. (ii)
2. (iii)
3. (ii) and (iv)
4. (i) and (iii)
Match List - I with List - II
List - I | List - II |
(a) Protoplast fusion | (i) Totipotency |
(b) Plant tissue culture | (ii) Pomato |
(c) Meristem culture | (iii) Somaclones |
(d) Micropropagation | (iv) Virus free plants |
Choose the correct answer from the options given below.
(a) | (b) | (c) | (d) | |
1. | (iii) | (iv) | (i) | (ii) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (iii) | (iv) | (ii) | (i) |
4. | (ii) | (i) | (iv) | (iii) |
Plant growth regulators which inhibit and promote the formation of lateral shoot respectively are:
1. Auxin, gibberellins
2. Cytokinin, ethylene
3. Gibberellins, abscisic acid
4. Auxin, cytokinin
Neurospora, Ustilago and Agaricus are similar in presence of ____________ during sexual life cycle:
1. Endogenous megaspore
2. Dikaryophase
3. Esogenous meiospore
4. Basidiocarp
Which of the following statement is not true?
1. | Plasma membrane is selectively permeable |
2. | Polar molecules cannot pass through the polar lipid bilayer |
3. | Neutral molecules pass the membranes through diffusion |
4. | Active transport is exhibited with the expenditure of ATP |
A collection of species, which bears a close resemblance to one another in the morphological characters of the floral parts is known as :-
1. Class
2. Genus
3. Division
4. Variety
Choose the incorrect statement with respect to pollen grain:
1. | Exine of the pollen grain has prominent apertures called germ pores where sporopollenin is absent. |
2. | Inner wall of the pollen grain is called intine. |
3. | Pollen grains are generally spherical in shape. |
4. | In 60 percent of angiosperms, pollen is shed at three-celled stage. |
Which of the following is considered a hotspot of biodiversity in India?
1. Indo-Gangetic plain
2. Eastern ghats
3. Aravalli hills
4. Western ghats
Stability of the DNA helical structure is conferred by:
1. | Stacking of one base pair over the other in addition to H-bonds |
2. | N-glycosidic bond between nitrogen base and sugar |
3. | Presence of 2' - OH group at every nucleotide |
4. | More than one option is correct. |
Which of the following statements do not justify the importance of photosynthesis?
1. | It is the primary source of all food on earth. |
2. | It is responsible for the release of oxygen into the atmosphere. |
3. | It is responsible for the water balance on earth. |
4. | Use of energy from sunlight by plants doing photosynthesis is the basis of life on earth. |
In the dicot root, the vascular cambium originates from:
1. | Tissue located below the phloem bundles, a portion of pericycle tissue, above the protoxylem. |
2. | Cortical region |
3. | Parenchyma between endodermis and pericycle |
4. | Intrafascicular and interfascicular tissue in a ring |
Which of the following can be used as a biocontrol agent in the treatment of plant disease?
1. Lactobacillus
2. Trichoderma
3. Chlorella
4. Anabaena
Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:
1. Phosphofructokinase
2. Aldolase
3. Hexokinase
4. Enolase
Which of the following statements is incorrect about gymnosperms?
1. They are heterosporous
2. Male and female gametophytes are free-living
3. Most of them have narrow leaves with thick cuticle
4. Their seeds are not covered
1. | Deadly nightshade | 2. | Date palm |
3. | Lupine | 4. | Methselah |
Select the wrong statement:
1. Diatoms are microscopic and float passively in water.
2. The walls of diatoms are easily destructible.
3. ‘Diatomaceous earth’ is formed by the cell walls of diatoms.
4. Diatoms are chief producers in the oceans.
The ovule of an angiosperm is technically equivalent to:
1. megaspore
2. megasporangium
3. megasporophyll
4. megaspore mother cell
Choose correct pair
Placentation | Example | ||
1. | Marginal | - | Dianthus, Silene |
2. | Axile | - | Pea, Acacia |
3. | Parietal | - | Lemon, Petunia |
4. | Basal | - | Triticum, Sunflower |
The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called:
1. Punnett square
2. Net square
3. Bullet square
4. Punch square
What does lac refer to in lac operon?
1. Lactase
2. 1,00,000
3. Lac insect
4. Lactose
1. | Cardiac glycosides | 2. | strychnine |
3. | toxic ricin | 4. | distasteful quinine |
I: | It occurs in virtually all cells |
II: | It is also called as HMP pathway |
III: | It occurs in the cytosol |
IV: | It is the only process in respiration in anaerobic organisms |
Which of the following is the function of mesosomes?
1. | help in cell wall formation |
2. | help in DNA replication and its distribution |
3. | help in respiration, secretion processes and increase surface area |
4. | All of the above |
Viability of seeds:
1. is maybe lost within a few months
2. of Lupinus arcticus was found to be 1000 years
3. recorded in Phoenix is 10000 years
4. can be tested by 0.1% solution of TTC
The floral diagram does not provide which of the following information?
1. Provides information about the number of parts of the flower
2. Arrangement of flower parts
3. Relation of flower parts with respect to each other
4. Medicinal use of plant
Which of the following fungus is used extensively in biochemical and genetic work?
1. Aspergillus
2. Colletortichum
3. Neurospora
4. Claviceps
Coralloid roots of gymnosperms are/have:
1. Irregular roots and possess a large number of roots hairs.
2. Symbiotic association with Rhizobium.
3. Symbiotic association with N2 - fixing cyanobacteria.
4. VAM
1. | Dicot root | Parenchymatous conjunctive tissue between xylem and phloem |
2. | Monocot root | Polyarch xylem bundles and well-developed pith |
3. | Isobilateral leaf | Palisade and spongy parenchyma in mesophyll |
4. | Dorsiventral leaf | Bulliform cells are absent |
How many statements are correct?
(i) | Chlorophyll-a , xanthophylls and carotenoids are called as accessory pigments. |
(ii) | Accessory pigments protect chlorophyll-a from photo-oxidation. |
(iii) | Chlorophylla are the major pigments responsible for trapping of light |
(iv) | chl-a and chl-b forms the reaction centre |
(v) | chl-a transfers the energy to accessory pigments. |
1. 2
2. 3
3. 4
4. 5
In respiration from 180g of glucose, which of the following is formed?
1. 264gm +190gm + 391 Kcal
2. 264gm +108gm + 686 Kcal
3. 390gm +108gm + 686 Kcal
4. 390gm + 264gm + 391 Kcal
Which of the following is true?
1. | All the elements present in a sample of earth’s crust are also present in a sample of living tissue |
2. | Carbon and Hydrogen are present in more amount in any living organism than earth’s crust. |
3. | Carbon and Hydrogen are present in more in living organisms than in non living matter. |
4. | All of the above |
Identify the correct statement with regard to phase (Gap 1) of interphase:
1. | The reorganisation of all cell components takes place. |
2. | The cell is metabolically active, grows but does not replicate its DNA |
3. | Nuclear Division takes place |
4. | DNA synthesis or replication takes place. |
1. | 10 | 2. | 9 |
3. | 25 | 4. | 15 |
1. | Cytokinins | 2. | Ethylene |
3. | Jasmonates | 4. | GAs |
The condition where urea accumulates in blood is:
1. Glycosuria
2. Uremia
3. Ketonuria
4. Acidosis
The endoplasmic reticulum, Golgi complex, lysosomes and vacuoles are considered together as an endomembrane system because:
1. | These are present in eukaryotic cells |
2. | They lack DNA |
3. | Their functions are coordinated |
4. | They have cisternae |
Identify the statement which is incorrect:
1. Sulphur is an integral part of cysteine.
2. Glycine is an example of lipids.
3. Lecithin contains a phosphorus atom in its structure.
4. Tyrosine possesses an aromatic ring in its structure.
Which of the following cross will produce four different blood groups in children?
1. |A|B X |A|B
2. |A|O X |B|O
3. |A|A X |A|B
4. |A|B X |O|O
Which of the following sequence is correct in terms of abundance?
1. | Neutrophils>Lymphocytes> Monocytes> Eosinophils> Basophils |
2. | Neutrophils>Lymphocytes< Monocytes> Eosinophils> Basophils |
3. | Neutrophils<Lymphocytes> Monocytes> Eosinophils> Basophils |
4. | Neutrophils>Lymphocytes> Monocytes <Eosinophils> Basophils |
Presence of which of the following conditions in urine is indicative of Diabetes Mellitus:
1. Uremia and Renal Calculi
2. Ketonuria and Glycosuria
3. Renal Calculi and Hyperglycaemia
4. Uremia and Ketonuria
1. | (i) & (iv) only |
2. | (ii) & (iii) only |
3. | (i) & (iii) only |
4. | (i), (ii), (iii) , (iv) |
When did an American company got patent rights on Basmati rice?
1. | 1997 | 2. | 1995 |
3. | 1998 | 4. | 1994 |
1. | Ca+2 | 2. | Na+ |
3. | K+ | 4. | Cl- |
In case of poriferans, the spongocoel is lined with flagellated cells called:
1. oscula
2. choanocytes
3. mesenchymal cells
4. ostia
A hormone that is antagonist to the parathyroid hormone is secreted from :
1. Thyroid
2. Adrenal cortex
3. Hypothalamus
4. Parathyroid itself
Which of the following had the smallest brain capacity?
1. Homo erectus
2. Homo sapiens
3. Homo neanderthalensis
4. Homo habilis
In which part of the human female reproductive system do the following events take place?
A. Release of semen by penis.
B. Release of a tiny first polar body.
C. Release of second polar body.
D. Implantation.
Identify the correct option for A, B, C and D:
A | B | C | D | |
1. | Cervix | Ovary | Ovary | Uterus |
2. | Cervix | Abdominal cavity | Fallopian tube | Uterus |
3. | Vagina | Ovary | Abdominal cavity | Uterus |
4. | Vagina | Ovary | Isthmis-ampullary junction of fallopian tube |
Uterus |
Match the following and choose the correct combination from the options given below:
Column I | Column II | ||
A. | Mutualism | 1. | Lion and deer |
B. | Commensalism | 2. | Roundworm and man |
C. | Parasitism | 3. | Birds compete with squirrels for nuts |
D. | Competition | 4. | Sea anemone on hermit crab |
E. | Predation | 5. | Barnacles attached to Whales. |
A | B | C | D | E | |
1. | 4 | 5 | 2 | 3 | 1 |
2. | 3 | 1 | 4 | 2 | 5 |
3. | 2 | 3 | 1 | 5 | 4 |
4. | 5 | 4 | 2 | 3 | 1 |
What is the quantity of human protein in the milk produced by first transgenic cow?
1. 2.4 g/litre
2. 4.8 g/litre
3. 4.2 g/litre
4. 1.2 g/litre
The neurotransmitter released at the neuromuscular junction is:
1. Adrenaline
2. Nor-adrenaline
3. Dopamine
4. Acetylcholine
Which part of the brain is responsible for thermoregulation?
1. Medulla oblongata
2. Cerebrum
3. Hypothalamus
4. Corpus callosum
Fight or flight reactions cause activation of:
1. | the parathyroid glands, leading to increased metabolic rate |
2. | the kidney, leading to suppression of reninangiotensin-aldosterone pathway |
3. | the adrenal medulla, leading to increased secretion of epinephrine and norepinephrine |
4. | the pancreas leading to a reduction in the blood sugar levels |
Which one of the following correctly explains the function of a specific part of a human nephron?
1. | Henle's loop - most reabsorption of the major substances from the glomerular filtrated |
2. | Distal convoluted tubule - reabsorption of ions into the surrounding blood capillaries |
3. | Afferent arteriole - carries the blood away from the glomerulus towards the renal vein |
4. | Podocytes- create minute spaces (slit pores) for the filtration of blood into the Bowman's capsule |
Select the correct statement from the following regarding cell membrane:
1. | Na+ and K+ ions move across the cell membrane by passive transport |
2. | Proteins make up 60 to 70% of the cell membrane. |
3. | Lipids are arranged in a bilayer with polar heads towards the inner part. |
4. | Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson |
Which group of animals belong to the same phylum?
1. Earthworm, Pinworm, Tapeworm
2. Prawn, Scorpion, Locusta
3. Sponge, Sea anemone, Starfish
4. Malarial parasite, Amoeba, Mosquito
(a) | |
(b) |
Molecule | Source | Use | |
1. | (a) Cocaine | Erythroxylum coca | Accelerates the transport of dopamine |
2. | (b) Heroin | Cannabis Sativa | Depressant and slows down body functions |
3. | (b) Cannabinoid | Atropa belladona | Produces hallucinations |
4. | (a) Morphine | Papaver somniferum | Sedative and pain killer |
Given below is a sample of a portion of DNA strand. What is so special shown in it?
5' GAATTC 3'
3' CTTAAG 5'
1. Replication completed
2. Deletion mutation
3. Start codon at the 5' end
4. Palindromic sequence of base pairs
Convergent evolution | Divergent evolution | |
1. | Bones of forelimbs of vertebrates | Wings of butterfly and birds |
2. | Thorn of Bougainvillea and tendrils of Cucurbita | Eye of Octopus and mammals |
3. | Eye of Octopus and mammals | Bones of forelimbs of vertebrates |
4. | Thorns of Bougainvillea and tendrils of Cucurbita | Wings of butterfly and birds |
The technique called gamete intrafallopian transfer (GIFT) is recommended for those females:
1. | Who cannot provide a suitable environment for fertilisation. |
2. | Who cannot produce an ovum. |
3. | Who cannot retain the fetus inside the uterus. |
4. | Whose cervical canal is too narrow to allow passage for the sperms |
An increase from pH 7.2 to pH 7.4 around hemoglobin causes:
1. | Hemoglobin to release all bound oxygen molecules |
2. | An increase in the affinity of hemoglobin to bind oxygen molecules |
3. | Hemoglobin to denature |
4. | An increase in the binding of H+ by hemoglobin |
The second heart sound during the cardiac cycle is produced by the:
1. Simultaneous opening of the atrioventricular valves
2. Simultaneous closure of the atrioventricular valves
3. Simultaneous opening of the semilunar valves
4. Simultaneous closure of the semilunar valves
At puberty, how many primary follicles are there in each ovary in a female?
1. 60000-80000
2. 120000-160000
3. 30000-40000
4. 12000
The molecule that provides stability to cell membrane is:
1. | 2. | ||
3. | 4. |
1. | proteins secreted by virus infected cells |
2. | cellular barriers in innate immunity |
3. | first line of defence against the entry of pathogen into the body |
4. | secreted in saliva and tears and are bactericidal |
Statement I: | In water, skin acts as aquatic respiratory organ (cutaneous respiration). |
Statement II: | On land, the buccal cavity, skin and lungs act as the respiratory organs. |
1. | fascicle | 2. | motor end plate |
3. | motor unit | 4. | myoneural junction |
1. | acromion | 2. | glenoid cavity |
3. | spine | 4. | scapular notch |
Carnivorous animals - lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as:
1. Character displacement
2. Altruism
3. Resource partitioning
4. Competitive exclusion
Which of the following is part of the thoracic chamber?
1. ribs and vertebral column
2. diaphragm
3. sternum
4. All of the above
The lumen of arteries gets-----because of the ----- of --------
1. narrower, dissolution, fat, cholesterol and fibrous tissues.
2. narrower, deposition, fat, cholesterol and fibrous tissues.
3. wider, deposition, fat, cholesterol and fibrous tissues.
4. wider, dissolution, fat, cholesterol and fibrous tissues.
Which of the following pituitary hormones will have more amount on 29th day of standard menstrual cycle?
1. LH
2. FSH
3. Estrogen
4. Progesterone
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?
1. Foetus
2. Uterus
3. Graafian follicle
4. Corpus luteum
Choose the correct match with respect to animals and their common names:
1. |
Bath sponge |
2. |
Venus flower basket |
3. |
Freshwater sponge |
4. |
Jellyfish |
Which of the following bacteria has a role in removing clots from the blood vessels?
1. Bacillus thuringiensis
2. Clostridium butylicum
3. Streptococcus
4. Lactobacillus
The DNA fingerprinting has applications in:
1. forensic sciences
2. population genetics
3. genetic diversities determination
4. All of the above
Adaptive radiation does not follow which of the following statements?
1. | Blackbirds on Galapagos islands observed by Darwin is an amazing example of Adaptive Radiation. |
2. | All the varieties of Finches evolved on the same island from original seed-feeding finches to insectivorous and vegetarian finches. |
3. | Australian marsupials, which are similar to each other evolved from an ancestral stock but all within the Australian island continent. |
4. | More than one adaptive radiation appeared to have occurred in an isolated geographical area representing different habitats, known as convergent evolution |
Study the given figure showing various human endocrine glands. Select the correct statement(s) regarding these:
(i) | Gland P is stimulated to secrete its hormones by thyrotropin secreted by anterior lobe of pituitary gland. |
(ii) | Gland R is associated with the secretion of hormones corticosteroids, epinephrine and norepinephrine. |
(iii) | Glands T and U represent the sex glands, which are derived from the mesoderm of embryo. |
(iv) | Gland Q is derived from mesoderm of the embryo and its increased size results in ageing. |
(v) | Gland S secretes the hormone glucagon which stimulates the liver to convert glucose into glycogen. |
1. | (i) and (ii) |
2. | (ii) and (iv) |
3. | (i), (ii) and (iii) |
4. | All are correct |
Which of the following statements is wrong?
1. | Movement is one of the significant features of living beings |
2. | Streaming of protoplasm in unicellular organisms like Amoeba is a simple form of movement |
3. | Animals and plants exhibit a wide range of movements |
4. | Movement of cilia, flagella, and tentacles is limited to a few organisms |
Which one is a true statement regarding DNA polymerase used in PCR?
1. It is used to ligate introduced DNA in recipient cell
2. It serves as a selectable marker
3. It is isolated from a virus
4. It remains active at high temperature
Which of the following is not a character of cancerous cells in our body?
1. Contact inhibition
2. Neoplasia
3. Metastasis
4. Inability for differentiation
What is the marriageable age for the females and males in India?
1. 18, 18
2. 18, 25
3. 21, 18
4. 18, 21
1. | transmits sensory information |
2. | transmits motor information |
3. | is the only location of unipolar neurons in the human body |
4. | is the site of coordination of the autonomic neural system |
When neutral or faintly alkaline is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:
1.
2.
3.
4.
The molecular formulae of A and B in the following are-
\(CH_3CH_2Br\xrightarrow{KCN}CH_3CH_2CN\xrightarrow{LiAlH_4}\\ A\xrightarrow {HNO_2,~0 \ ^{o}C}B\)
1. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}, and ~\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\)
2. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}, and ~\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\)
3. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{NH}, and ~\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\)
4. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{NH}, and ~\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\)
Which of the following statements are correct about this reaction?
(i) | The given reaction follows SN2 mechanism. |
(ii) | (b) and (d) have opposite configuration. |
(iii) | (b) and (d) have the same configuration. |
(iv) | The given reaction follows SN1 mechanism |
Choose the correct option:
1. (i, ii)
2. (ii, iii)
3. (iii, iv)
4. (i, iii)
The dihedral angle of the least stable conformer of ethane is:
1. | 60° | 2. | 0° |
3. | 120° | 4. | 180° |
The spin-only magnetic moment of [MnBr4]2– is 5.9 BM. The geometry of the complex ion is-
1. Square planar
2. Tetrahedral
3. Octahedral
4. None of the above
In a molecule of pyrophosphoric acid, the number of P – OH, P = O and P – O – P bonds/moiety (ies) respectively are :
1. | 4, 2 and 0 | 2. | 2, 4 and 1 |
3. | 4, 2 and 1 | 4. | 3, 3 and 3 |
The correct structure of -anomer of maltose, among the following is-
1. | |
2. | |
3. | |
4. |
Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are:
(A) | (B) | (C) |
1. B only
2. C only
3. B and C only
4. A and B only
The increasing order of the boiling points of the major products A, B and C of the following reactions will be :
(a). | |
(b). | |
(c). |
1. C < A < B
2. B < C < A
3. A < B < C
4. A < C < B
The radius of the second Bohr orbit for hydrogen atom is –
(Planck's Const. h = 6.6262 × 10–34 Js; mass of electron = 9.1091 × 10–31 kg; charge of electron e = 1.60210 ×10–19 C; permittivity of vaccum ∈0 = 8.854185 ×10–12 kg–1m–3A2)
1. 0.529 Å
2. 2.12 Å
3. 1.65 Å
4. 7.76 Å
The molecular formula of a commercial resin used for exchanging ions in water softening is . The maximum uptake of ions by the resin when expressed in mole per gram resin is-
1.
2.
3.
4.
The ionic radii (in Å) of are respectively :
1. 1.36, 1.40 and 1.71
2. 1.36, 1.71 and 1.40
3. 1.71, 1.40 and 1.36
4. 1.71, 1.36 and 1.40
At 25°C, the solubility product of Mg(OH)2 is 1.0 × 10-11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions?
1. 8
2. 9
3. 10
4. 11
In the following sequence of reactions,
then
compound 'D' is –
1. Butanal
2. n-Butyl alcohol
3. n-Propyl alcohol
4. Propanal
A non-ideal solution was prepared by mixing 30 mL chloroform and 50 mL acetone. The volume of the mixture will be:
1. >80 mL
2. <80 mL
3. =80 mL
4. 80 mL
The reaction,
is balanced if :
1. 𝑋 = 5, 𝑌 = 2
2. 𝑋 = 2, 𝑌 = 5
3. 𝑋 = 4, 𝑌 = 10
4. 𝑋 = 5, 𝑌 = 5
The factors that may be regarded as the main cause of lanthanoid contraction among the following is-
1. | Greater shielding of 5d electron by 4f electrons |
2. | Poorer shielding of 5d electron by 4f electrons |
3. | Effective shielding of one of the 4f electrons by another in the sub-shell |
4. | Poor shielding of one of the 4f electrons by another in the sub-shell |
The rate equation for the reaction 2A+B→C is found to be:
rate = k [A] [B]
The correct statement in relation to this reaction is that the:
1. | Unit of k must be s-1 |
2. | t1/2 is a constant |
3. | Rate of formation of C is twice the rate of disappearance of A |
4. | Value of k is independent of the initial concentrations of A and B |
The compound has a minimum boiling point among the following is:
1. n-Butane
2. Isobutene
3. 1-Butene
4. 1-Butyne
The IUPAC name of [Co(NH3)5ONO]2+ ion is:
1. Pentaamminenitritocobalt(IV) ion
2. Pentaamminenitritocobalt(III) ion
3. Pentaamminenitrocobalt(III) ion
4. Pentaamminenitrocobalt (IV) ion
An organic compound C5H10O forms phenyl hydrazone that gives a positive iodoform test and undergoes Wolff Kishner reaction to give isopentane. The IUPAC name of the organic compound among the following is:
1. Pentanol
2. Pentan-2-one
3. Pentan-3-one
4. 3-Methylbutan-2-one
An aqueous solution of 1M NaCl and 1M HCl is :
1. not a buffer but pH < 7
2. not a buffer but pH >7
3. a buffer with pH <7
4. a buffer with pH >7
PCl3 and PCl5 both exist; NCl3 exists but NCl5 does not exist. It is due to:
1. | Lower electronegativity of P and N |
2. | Lower tendency of N to form a covalent bond |
3. | Availability of vacant d-orbital in P but not in N |
4. | The statement is incorrect |
The number of electrons passing per second through a cross-section of Cu wire carrying 10 ampere is :
1.
2.
3.
4.
The internal energy change when a system goes from state A to B is 40 k J/mol . If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy?
1. 40 kJ
2. > 40kJ
3. < 40 kJ
4. zero
Correct statement among the following is -
1. Sn2+ is oxidising agent while Pb4+ is reducing agent
2. Sn2+ and Pb2+ both are oxidising agent
3. Sn4+ is reducing agent while Pb4+ is oxidising agent
4. Sn2+ is reducing agent while Pb4+ is oxidising agent
1. | The reactant molecule is assumed to be a hard sphere. |
2. | Collision frequency between reactants is the only factor that determines the rate of the reaction. |
3. | The steric factor takes into account the relative orientation of the reactant molecules during collisions. |
4. | The theory does not take into account the structural aspects of the molecules during a collision. |
1. | 20° and 90° | 2. | 90° and 180° |
3. | 90° | 4. | 180° |
1. | Weak acid and it's salt with a strong base. |
2. | Equal volumes of equimolar solutions of weak acid and weak base. |
3. | Strong acid and its salt with a strong base. |
4. | Strong acid and its salt with a weak base. (The pKa of acid = pKb of the base) |
1. | A and B | 2. | A and D |
3. | A and C | 4. | B and C |
Assertion (A): | Oxygen has less negative electron gain enthalpy than sulphur. |
Reason (R): | The electronegativity of oxygen is higher than that of sulphur. |
1. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are correct but (R) is not the correct explanation of (A). |
3. | (A) is correct, but (R) is not correct. |
4. | (A) is not correct, but (R) is correct. |
In the preparation of compounds of Xe, Bartlett had taken as a base compound. This is because-
1. | Both O2 and Xe have the same size. |
2. | Both O2 and Xe have the same electron gain enthalpy. |
3. | Both O2 and Xe have almost the same ionisation enthalpy. |
4. | Both Xe and O2 are gases. |
When 0.1 mol CoCl3(NH3)5 is treated with an excess of AgNO3, 0.2 mol of AgCl are obtained. The conductivity of the solution will correspond to-
1. 1:3 electrolyte
2. 1:2 electrolyte
3. 1:1 electrolyte
4. 3:1 electrolyte
The reaction that does not give benzoic acid as the major product is:
1. | |
2. | |
3. | |
4. |
Order of acidic strength of the following compounds will be:
A. | B. | \(C_6H_5OH\) | |
C. | D. |
1. C > D > B > A
2. D > C > B > A
3. A > B > C > D
4. B > A > C > D
During the change of O2 to , the incoming electron that goes to the orbital is-
1. | \(\sigma _{2pz}^{*}\) | 2. | π2py |
3. | \(\sigma _{2pz}\) | 4. | π*2px |
The standard Gibbs energy for the given cell reaction in kJ mol–1 at 298 K is :
Eº(cell) = 2V at 298 K
(Faraday’s constant, F = 96000 C mol–1)
1. -192 kJ mol–1
2. 192 kJ mol–1
3. -384 kJ mol–1
4. 384 kJ mol–1
5 moles of AB2 weight kg and 10 moles A2B2 weight kg. The molar mass of A (MA) and molar mass of B (MB) in kg mol are:
1. | MA = 10×10-3 and MB = 5×10-3 |
2. | MA = 25×10-3 and MB = 50×10-3 |
3. | MA = 5×10-3 and MB = 10×10-3 |
4. | MA= 50×10-3 and MB = 25×10-3 |
At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. The vapour pressure in mm Hg of n-heptane in its pure state is:
1. 500
2. 600
3. 700
4. 800
If 75 % of a first order reaction was completed in 90 minutes, 60 % of the same reaction would be completed in approximately (in minutes)-
(Take : log 2 = 0.30 ; log 2.5 = 0.40)
1. 50 min
2. 60 min
3. 70 min
4. 65 min
The solubility of Ca(OH)2 in water is:
[Given: Ksp Ca(OH)2 in water = 5.5 × 10–6]
1. 1.77 × 10–6
2. 1.11 × 10–6
3. 1.11 × 10–2
4. 2.77 × 10–2
Total number of lone pair of electrons in \({I }_{3}^{-}\) ion are:
1. | 3 | 2. | 6 |
3. | 9 | 4. | 12 |
Assuming ideal behaviour, the magnitude of log K for the following reaction at 25°C is
x × 10–1 . The value of x is-
1. 860
2. 875
3. 855
4. 895
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is-
(at. mass Ag = 108; Br = 80)
1. 24
2. 36
3. 48
4. 60
The compound among the following that shows geometrical isomerism is:
1. 1-Phenyl-2-butene
2. 3-Phenyl -1-butene
3. 2-Phenyl-1-butene
4. 1,1-Diphenyl-1-propene
The most stable carbocation among the following is:
1. | 2. | ||
3. | 4. |
Two stars of masses \(m\) and \(2m\) at a distance \(d\) rotate about their common centre of mass in free space. The distance of the centre of mass from the heavier mass is:
1. \(\frac{d}{3}\)
2. \(\frac{2 d}{3}\)
3. \(\frac{4 d}{3}\)
4. \(\frac{5 d}{3}\)
1. | much greater than one |
2. | one |
3. | between zero and one |
4. | equal to zero |
1. | initial magnetic flux only |
2. | final magnetic flux only |
3. | rate of change of magnetic flux |
4. | the net change in magnetic flux |
1. | \(10\sqrt 2\) volt | 2. | \(20\) volt |
3. | \(20\sqrt 2\) volt | 4. | \(40\) volt |
1. | is increased |
2. | is decreased |
3. | remains unchanged |
4. | increases or decreases according to the nature of the gas |
1. | Thick wire |
2. | Thin wire |
3. | Both show the same expansion |
4. | None of the above |
1. | distance, distance, acceleration, time |
2. | distance acceleration, distance, time |
3. | acceleration, distance, distance, time |
4. | none of the above |
1. | Both cannot be zero. |
2. | One of the two may be zero. |
3. | Both must be zero. |
4. | If one is positive, the other is negative, and vice-versa. |
1. | always flows from A to B |
2. | always flows from B to A |
3. | first flows from A to B then from B to A |
4. | first flows from B to A and then from A to B |
1. | four times, doubled |
2. | doubled, remains unchanged |
3. | remains unchanged, doubled |
4. | four times, remains unchanged |
Select the correct option based on statements below:
Assertion (A): | The escape velocities of planet A and B are same. But A and B are of unequal mass. |
Reason (R): | The product of their mass and radius must be same, \(M_1R_1=M_2R_2.\) |
1. | Both (A) and (R) are correct but (R) is not the correct explanation of (A). |
2. | (A) is correct but (R) is not correct. |
3. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
4. | (A) is not correct but (R) is correct. |
Images of the same size are formed by a convex lens when the object is placed at \(20\) cm or at \(10\) cm from the lens. The focal length of the convex lens is:
1. | \(5\) cm | 2. | \(10\) cm |
3. | \(15\) cm | 4. | \(20\) cm |
A man runs along a horizontal road holding his umbrella vertical in order to afford maximum protection from the rain. The rain is actually:
1. | falling vertical |
2. | coming from the front of the man |
3. | coming from the back of the man |
4. | either of \(1,\) \(2,\) or \(3\) |
The center of mass of a thin conical surface of height \(h\) lies at a distance \(\lambda h\) from its apex, the base of the cone being hollow. The value of \(\lambda\) equals:
1. \(\frac12\)
2. \(\frac23\)
3. \(\frac34\)
4. \(\frac25\)
1. | Current flows through \(D_1\) but no current flows through \(D_2\) |
2. | Current flows through \(D_2\) but no current flows through \(D_1\) |
3. | Current flows through both \(D_1,D_2\) |
4. | No current flows through either \(D_1\) or \(D_2\) |