The experimental proof for semiconservative replication of DNA was first shown in a:
1. Fungus
2. Bacterium
3. Plant
4. Virus
Offsets are produced by:
1. | Meiotic divisions |
2. | Mitotic divisions |
3. | Parthenocarpy |
4. | Parthenogenesis |
Select the correct match:
1. Alec Jeffreys – Streptococcus pneumoniae
2. Alfred Hershey and Martha Chase – TMV
3. Matthew Meselson and F. Stahl – Pisum sativum
4. Francois Jacob and Jacques Monod – Lac operon
Which of the following has proved helpful in preserving pollens as fossils?
1. | Pollen kit | 2. | Cellulosic intine |
3. | Oil content | 4. | Sporopollenin |
1. Temperature
2. Light
3. O2 concentration
4. CO2 concentration
1. | Pachytene | 2. | Diplotene |
3. | Diakinesis | 4. | Zygotene |
The two functional groups characteristic of sugars are:
1. | Hydroxyl and methyl | 2. | Carbonyl and methyl |
3. | Carbonyl and phosphate | 4. | Carbonyl and hydroxyl |
1. | ATP | 2. | NADH |
3. | NADPH | 4. | Oxygen |
Which among the following is not a prokaryote?
1. Saccharomyces
2. Mycobacterium
3. Nostoc
4. Oscillatoria
1. Larger nucleoli are present in dividing cells.
2. It is a membrane-bound structure.
3. It takes part in spindle formation.
4. It is a site for active ribosomal RNA synthesis.
1. Carbon
2. Cl
3. Fe
4. Oxygen
Which of the following is a secondary pollutant?
1. | All the biological factors in the organism environment |
2. | The physical space where an organism lives |
3. | The range of temperature that the organism needs to live |
4. | The functional role played by the organism where it lives |
Natality refers to:
1. Death rate
2. Birth rate
3. Number of individuals leaving the habitat
4. Number of individuals entering the habitat
What type of ecological pyramid would be obtained with the following data?
Secondary consumer: 120 g
Primary consumer: 60 g
Primary producer: 10 g
1. Inverted pyramid of biomass
2. Pyramid of energy
3. Upright pyramid of numbers
4. Upright pyramid of biomass
1. 5th June
2. 21st April
3. 16th September
4. 22nd April
1. | Indian Council of Medical Research (ICMR) |
2. | Council for Scientific and Industrial Research (CSIR) |
3. | Research Committee on Genetic Manipulation (RCGM) |
4. | Genetic Engineering Appraisal Committee (GEAC) |
A 'new variety of rice was patented by a foreign company through such varieties have been present in India for a long time. This is related to the?
1. Co-667
2. Sharbati Sonora
3. Lerma Rojo
4. Basmati
Select the correct Match:
1. Ribozyme - Nucleic acid
2. F2 × Recessive parent - Dihybrid cross
3. T.H. Morgan - Transduction
4. G. Mendel - Transformation
Use of bioresources by multinational companies and organizations without authorization from the concerned country and its people is called?
1. Bio-infringement
2. Biopiracy
3. Biodegradation
4. Bio-exploitation
1. Extension, Denaturation, Annealing
2. Annealing, Extension, Denaturation
3. Denaturation, Extension, Annealing
4. Denaturation, Annealing, Extension
Secondary xylem and phloem in dicot stem are produced by?
1. | Apical meristems | 2. | Vascular cambium |
3. | Phellogen | 4. | Axillary meristems |
Which of the following statement is correct?
1. | Ovules are not enclosed by the ovary wall in gymnosperms. |
2. | Selaginella is heterosporous, while Salvinia is homosporous. |
3. | Horsetails are gymnosperms. |
4. | Stems are usually unbranched in both Cycas and Cedrus. |
Select the wrong statement:
1. | Cell wall is present in members of Fungi and Plantae. |
2. | Mushrooms belong to Basidiomycetes. |
3. | Pseudopodia are locomotory and feeding structures in Sporozoans. |
4. | Mitochondria are the powerhouse of the cell in all kingdoms except Monera. |
Column I | Column II | ||
a. | Herbarium | i. | It is a place having a collection of preserved plants and animals. |
b. | Key | ii. | A list that enumerates methodically all the species found in an area with a brief description aiding identification. |
c. | Museum | iii. | Is a place where dried and pressed plant specimens mounted on sheets are kept. |
d. | Catalogue | iv. | A booklet containing a list of characters and their alternates which are helpful in the identification of various taxa. |
a | b | c | d | |
1. | i | iv | iii | ii |
2. | iii | ii | i | iv |
3. | ii | iv | iii | i |
4. | iii | iv | i | ii |
Winged pollen grains are present in:
1 Mustard
2. Cycas
3. Mango
4. Pinus
After karyogamy followed by meiosis, spores are produced exogenously in?
1. | Neurospora | 2. | Alternaria |
3. | Agaricus | 4. | Saccharomyces |
1. | It functions as an enzyme |
2. | It functions as an electron carrier |
3. | It is a nucleotide source for ATP synthesis |
4. | It is the final electron acceptor for anaerobic respiration |
1. | Green sulphur bacteria | 2. | Nostoc |
3. | Cycas | 4. | Chara |
Pollen grains can be stored for several years in liquid nitrogen having a temperature of:
1. | –120 °C | 2. | –80 °C |
3. | –196 °C | 4. | –160 °C |
1. | Ferric | 2. | Ferrous |
3. | Free element | 4. | Both ferric and ferrous |
1. | Fusion of two male gametes of a pollen tube with two different eggs |
2. | Fusion of one male gamete with two polar nuclei |
3. | Fusion of two male gametes with one egg |
4. | Syngamy and triple fusion |
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
1. | Hydrilla | 2. | Yucca |
3. | Banana | 4. | Viola |
1. | hCG, hPL, progesterone, prolactin |
2. | hCG, hPL, estrogens, relaxin, oxytocin |
3. | hCG, hPL, progesterone, estrogens |
4. | hCG, progesterone, estrogens, glucocorticoids |
1. | blocks estrogen receptors in the uterus, preventing implantation. |
2. | increases the concentration of estrogen and prevents ovulation in females. |
3. | is an lUD. |
4. | is a post-coital contraceptive. |
1. | In spermiogenesis, spermatids are formed, while in spermiation, spermatozoa are formed. |
2. | In spermiogenesis, spermatozoa are formed, while in spermiation, spermatids are formed. |
3. | In spermiogenesis, spermatozoa from Sertoli cells are released into the cavity of seminiferous tubules, while in spermiation, spermatozoa are formed. |
4. | In spermiogenesis, spermatozoa are formed, while in spermiation, spermatozoa are released from Sertoli cells into the cavity of seminiferous tubules. |
1. | pre-reproductive individuals are more than reproductive individuals. |
2. | reproductive individuals are less than post-reproductive individuals. |
3. | reproductive and pre-reproductive individuals are equal in number. |
4. | pre-reproductive individuals are less than reproductive individuals. |
Which part of poppy plant is used to obtain the drug Smack?
1. | Flowers | 2. | Latex |
3. | Roots | 4. | Leaves |
Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
(a) | Eutrophication | (i) | UV-B radiation |
(b) | Sanitary landfill | (ii) | Deforestation |
(c) | Snow blindness | (iii) | Nutrient enrichment |
(d) | Jhum cultivation | (iv) | Waste disposal |
Options: | (a) | (b) | (c) | (d) |
1. | (ii) | (i) | (iii) | (iv) |
2. | (i) | (iii) | (iv) | (ii) |
3. | (iii) | (iv) | (i) | (ii) |
4. | (i) | (ii) | (iv) | (iii) |
1. Commensalism
2. Mutualism
3. Parasitism
4. Amensalism
1. | Enzymes of the TCA cycle are present in the mitochondrial matrix. |
2. | Glycolysis occurs in the cytosol. |
3. | Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms. |
4. | Oxidative phosphorylation takes place in the outer mitochondrial membrane. |
Column I | Column II | |
1. | Lampbrush | Diplotene bivalents chromosomes |
2. | Allosomes | Sex chromosomes |
3. | Submetacentric | L-shaped chromosomes |
4. | Polytene | Oocytes of amphibians chromosomes |
Nissl bodies are mainly composed of:
1. | Proteins and lipids | 2. | DNA and RNA |
3. | Nucleic acids and SER | 4. | Free ribosomes and RER |
1. Thecodont, Diphyodont, Homodont
2. Thecodont, Diphyodont, Heterodont
3. Pleurodont, Monophyodont, Homodont
4. Pleurodont, Diphyodont, Heterodont
Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
a. | Glycosuria | i. | Accumulation of uric acid in joints |
b. | Gout | ii. | Mass of crystallized salts within the kidney |
c. | Renal calculi | iii. | Inflammation in glomeruli |
d. | Glomerulonephritis | iv. | Presence of glucose in urine |
Options:
a | b | c | d | |
1. | iii | ii | iv | i |
2. | i | ii | iii | iv |
3. | ii | iii | i | iv |
4. | iv | i | ii | iii |
Match the items given in Column I with those Column II and select the correct option given below:
Column I | Column II | ||
(Function) | (Part of the Excretory system) | ||
(a) | Ultrafiltration | (i) | Henle's loop |
(b) | Concentration of urine | (ii) | Ureter |
(c) | Transport of urine | (iii) | Urinary bladder |
(d) | Storage of urine | (iv) | Malpighian corpuscle |
(v) | Proximal convoluted tubule |
Options: | (a) | (b) | (c) | (d) |
1. | (iv) | (v) | (ii) | (iii) |
2. | (iv) | (i) | (ii) | (iii) |
3. | (v) | (iv) | (i) | (ii) |
4. | (v) | (iv) | (i) | (iii) |
1. Forelimbs of man, bat and cheetah
2. Heart of bat, man and cheetah
3. Brain of bat, man and cheetah
4. Eye of octopus, bat and man
Which of the following characteristics represent the 'Inheritance of blood groups' in humans?
a. Dominance
b. Co-dominance
c. Multiple allelism
d. Incomplete dominance
e. Polygenic inheritance
1. | b, c, and e | 2. | a, b and c |
3. | b, d, and e | 4. | a, c, and e |
Column I | Column II | |
1. | Medulla oblongata | controls respiration and cardiovascular reflexes. |
2. | Limbic system | consists of fibre tracts that interconnect different regions of brain; controls movement. |
3. | Hypothalamus | production of releasing hormones and regulation of temperature, hunger and Thirst. |
4. | Corpus callosum | band of fibers connecting left and right cerebral hemispheres. |
1. | Aldosterone and Prolactin |
2. | Progesterone and Aldosterone |
3. | Estrogen and Parathyroid hormone |
4. | Parathyroid hormone and Prolactin |
Ciliates differ from all other protozoans in?
1. | using flagella for locomotion |
2. | having a contractile vacuole for removing excess water |
3. | using pseudopodia for capturing prey |
4. | having two types of nuclei |
1. | Presence of a boat shaped sternum on the 9th abdominal segment |
2. | Presence of caudal styles |
3. | Forewings with darker tegmina |
4. | Presence of anal cerci |
1. | Inflammation of bronchioles; decreased respiratory surface |
2. | Increased number of bronchioles; increased respiratory surface |
3. | Increased respiratory surface; inflammation of bronchioles |
4. | Decreased respiratory surface; inflammation of bronchioles |
Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
(a) | Tricuspid valve | (i) | Between left atrium and left ventricle |
(b) | Bicuspid valve | (ii) | Between right ventricle and pulmonary artery |
(c) | Semilunar valve | (iii) | Between right atrium and right ventricle |
Options: | (a) | (b) | (c) |
1. | iii | i | ii |
2. | i | iii | ii |
3. | i | ii | iii |
4. | ii | i | iii |
Column I | Column II | ||
(a) | Tidal volume | (i) | 2500-3000 mL |
(b) | Inspiratory Reserve | (ii) | 1100-1200 mL volume |
(c) | Expiratory Reserve | (iii) | 500-550 mL volume |
(d) | Residual volume | (iv) | 1000-1100 mL |
Options: | (a) | (b) | (c) | (d) |
1. | (iii) | (ii) | (i) | (iv) |
2. | (iii) | (i) | (iv) | (ii) |
3. | (i) | (iv) | (ii) | (iii) |
4. | (iv) | (iii) | (ii) | (i) |
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
1. | AGGUAUCGCAU | 2. | UGGTUTCGCAT |
3. | ACCUAUGCGAU | 4. | UCCAUAGCGUA |
Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
(a) | Proliferative Phase | (i) | Breakdown of the endometrial lining |
(b) | Secretory Phase | (ii) | Follicular Phase |
(c) | Menstruation | (iii) | Luteal Phase |
Options: | (a) | (b) | (c) |
1. | (iii) | (ii) | (i) |
2. | (i) | (iii) | (ii) |
3. | (ii) | (iii) | (i) |
4. | (iii) | (i) | (ii) |
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by:
1. | Only daughters | 2. | Only sons |
3. | Only grandchildren | 4. | Both sons and daughters |
Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
a. | Fibrinogen | i. | Osmotic balance |
b. | Globulin | ii. | Blood clotting |
c. | Albumin | iii. | Defence mechanism |
a | b | c | |
1. | iii | ii | i |
2. | i | ii | iii |
3. | i | iii | ii |
4. | ii | iii | i |
1. | binds to troponin to remove the masking of active sites on actin for myosin. |
2. | activates the myosin ATPase by binding to it. |
3. | detaches the myosin head from the actin filament. |
4. | prevents the formation of bonds between the myosin cross bridges and the actin filament. |
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. . The evolved gaseous mixture is passed through KOH pellets.
Weight (in g) of the remaining product at STP will be:
1. 1.4
2. 3.0
3. 2.8
4. 4.4
The nitration of aniline in a strong acidic medium results in the formation of m-nitroaniline because:
1. | In spite of substituents nitro group always goes to only m-position |
2. | In electrophilic substitution reactions amino group is meta directive |
3. | In absence of substituents nitro group always goes to only m-position |
4. | In an acidic (strong) medium aniline is present as anilinium ion |
The most acidic oxide among the following is -
1. MgO
2. BeO
3. BaO
4. CaO
The difference between amylose and amylopectin is:
1. | Amylopectin has 1→4 α - linkage and 1→6 α-linkage. |
2. | Amylose has 1→4 α-linkage and 1 → 6 β-linkage. |
3. | Amylopectin has 1 → 4 α-linkage and 1 → 6 β-linkage. |
4. | Amylose is made up of glucose and galactose. |
Incorrect statement regarding cross-linked or network polymers is:
1. | They contain covalent bonds between various linear polymer chains. |
2. | They are formed from bi and tri functional monomers. |
3. | Examples are bakelite and melamine. |
4. | They contain strong covalent bonds in same polymer chain. |
1. Dichloromethyl cation \((^{+}CHCl_{2})\)
2. Formyl cation \((^{+}CHO)\)
3. Dichloromethyl anion \((^{-}CHCl_{2})\)
4. Dichlorocarbene (:CCl2)
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to:
1. | Formation of intramolecular H-bonding |
2. | Formation of carboxylate ion |
3. | More extensive association of carboxylic acid via van der waals force of attraction |
4. | Formation of intermolecular H-bonding |
Compound A, is found to react with NaOI (produced by reacting Y with NaOH) and yield a yellow precipitate with a characteristic smell. A and Y are respectively?
1. | |
2. | |
3. | |
4. |
The correct statement among the following is:
1. | the rate of a first-order reaction does not depend on reactant concentration; the rate of a second-order reaction does depend on reactant concentrations. |
2. | the half-life of a first-order reaction does not depend on [A]o; the half-life of a second-order reaction does depend on [A]0 |
3. | a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed. |
4. | the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations |
The correct order of ionic character among CaH2, BeH2, and BaH2 is:
1.
2.
3.
4.
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below:
Then the species undergoing disproportionation is:-
1. | \(\text{BrO}^-_3\) | 2. | \(\text{BrO}^-_4\) |
3. | \(\text{Br}_2\) | 4. | \(\text{HBrO}\) |
Magnesium reacts with an element (X) to form an ionic compound.
If the ground state electronic configuration of (X) is ,
the simplest formula for this compound is:
1.
2.
3.
4.
Iron exhibits bcc structure at room temperature. Above 900 °C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 °C is:
(Molar mass and
atomic radii of iron remain constant with temperature)
1.
2.
3.
4.
The incorrect statement among the following is:
1. | Total orbital angular momentum of an electron in 's' orbital is equal to zero. |
2. | An orbital is designated by three quantum numbers, while an electron in an atom is designated by four quantum numbers. |
3. | The electronic configuration of N atom is |
4. | The value of m for dz2 is zero. |
1. | NO | 2. | CN– |
3. | CN+ | 4. | CN |
An element that cannot form ion is-
1. | Ga | 2. | Al |
3. | B | 4. | In |
In the structure of ClF3, the number of lone pairs of electrons on central atom 'Cl' is:
1. 1
2. 2
3. 3
4. 4
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
1. Fe
2. Zn
3. Mg
4. Cu
The correct order of atomic radii of the group 13 elements is-
1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < Tl < In
4. B < Ga < Al < In < Tl
The correct order of N-compounds in its decreasing order of oxidation states is :
1.
2.
3.
4.
1. The magnitude of the charge on the ion alone
2. Size of the ion alone
3. Both magnitude and sign of the charge on the ion.
4. The sign of the charge on the ion alone.
The following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations :
A)
B)
C)
D)
pH of which one of them will be equal to 1?
1. B
2. A
3. D
4. C
The solubility of BaSO4 in water is g/ litre at 298 K. The value of the solubility product will be: (Molar mass of BaSO4 = 233 gmol–1)
1. | 1.08 × 10-10 mol2 L-2 | 2. | 1.08 × 10-12 mol2 L-2 |
3. | 1.08 × 10-14 mol2 L-2 | 4. | 1.08 × 10-8 mol2 L-2 |
If van der Waals constant "a" for NH3, H2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, then which one of the following gases is most easily liquefied?
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether.
A, B and C are respectively:
1.
2.
3.
4.
Hydrocarbon (A) reacts with bromine by substitution reaction to form an alkyl bromide B.
B undergoes the Wurtz reaction to give a gaseous hydrocarbon containing less than four carbon atoms.
The formula of (A) is:
1.
2.
3.
4.
The compound undergoes the following reactions
C
The product 'C' is-
1. m–Bromotoluene
2. o–Bromotoluene
3. 3–Bromo–2,4,6–trichlorotoluene
4. p–Bromotoluene
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
1. N2O5
2. NO2
3. N2O
4. NO
For the redox reaction,
a
the correct stoichiometric coefficients of the reactants a, b, and c respectively for the balanced equation are:
1. 16, 5, 2
2. 2, 5, 16
3. 2, 16, 5
4. 5, 16, 2
Mark the conditions that favour the maximum product formation in the given reaction.
1. Low temperature and High pressure
2. Low temperature and Low pressure
3. High temperature and High pressure
4. High temperature and Low pressure
When the initial concentration of the reactant is doubled,
the half-life period of a zero-order reaction:
1. | is halved | 2. | is doubled |
3. | is tripled | 4. | remains unchanged |
The bond dissociation energies of and XY are in the ratio of 1 : 0.5 : 1. ∆H for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X2 will be
1. 200 kJ mol–1
2. 100 kJ mol–1
3. 800 kJ mol–1
4. 400 kJ mol–1
P, Q, and R in the above-mentioned sequence of reactions are respectively:
1. | |
2. | |
3. | |
4. |
1. | Aniline | 2. | Acetanilide |
3. | Benzoic acid | 4. | Glycine |
1. | Geometrical isomerism | 2. | Coordination isomerism |
3. | Ionization isomerism | 4. | Linkage isomerism |
1. | \(\mathrm{CrO}_4^{2-} \) | 2. | \(\mathrm{Cr}_2 \mathrm{O}_7^{2-} \) |
3. | \(\mathrm{MnO}_4^{-} \) | 4. | \(\mathrm{MnO}_4^{2-}\) |
1. square planar geometry and diamagnetic
2. tetrahedral geometry and diamagnetic
3. square planar geometry and paramagnetic
4. tetrahedral geometry and paramagnetic
Iron carbonyl, , is classified as:
1. | Tetranuclear | 2. | Mononuclear |
3. | Trinuclear | 4. | Dinuclear |
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II
and select the correct match:
Column I | Column II |
A. Co3+ | i. √8 B.M. |
B. Cr3+ | ii. √35 B.M. |
C. Fe3+ | iii. √15 B.M. |
D. Ni2+ | iv. √24 B.M. |
A | B | C | D | |
1. | iv | iii | ii | i |
2. | i | ii | iii | iv |
3. | iv | i | ii | iii |
4. | iii | iv | i | ii |
The correct order with respect to –I effect of the substituents is:
(R = alkyl)
1. -NH2 > - OR < - F
2. -NR2 < -OR < - F
3. -NH2 > - OR > - F
4. -NR2 > - OR > - F
The most stable carbocation among the following is:
1. | 2. | ||
3. | 4. |
The molecule among the following that has the hybridization from left to right atoms is:
1.
2.
3.
4.
An EM wave is propagating in a medium with a velocity \(\overrightarrow{{v}}={v} \hat{i}\). The instantaneous oscillating electric field of this EM wave is along the \(+y\) axis. The direction of the oscillating magnetic field of the EM wave will be along:
1. \(-z \text-\)direction
2. \(+z \text-\) direction
3. \(-y \text-\) direction
4. \(+y \text-\) direction
The refractive index of the material of a prism is and the angle of the prism is \(30^\circ.\) One of the two refracting surfaces of the prism is made a mirror inwards with a silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if the angle of incidence on the prism is:
1. | \(60^\circ\) | 2. | \(45^\circ\) |
3. | \(30^\circ\) | 4. | zero |
The magnetic potential energy stored in a certain inductor is \(25\) mJ, when the current in the inductor is \(60\) mA. This inductor is of inductance:
1. \(0.138\) H
2. \(138.88\) H
3. \(1.389\) H
4. \(13.89\) H
An object is placed at a distance of \(40\) cm from a concave mirror of a focal length of \(15\) cm. If the object is displaced through a distance of \(20\) cm towards the mirror, the displacement of the image will be:
1. | \(30\) cm away from the mirror |
2. | \(36\) cm away from the mirror |
3. | \(30\) cm towards the mirror |
4. | \(36\) cm towards the mirror |
In the combination of the following gates, the output \(Y\) can be written in terms of inputs \(A\) and \(B\) as:
1. | \(\overline {A\cdot B}\) | 2. | \(A\cdot \overline{B}+ B\cdot \overline{A}\) |
3. | \(\overline {A\cdot B}+ A\cdot B\) | 4. | \(\overline {A+ B}\) |
In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0, and VCE = 0. The values of IB, IC and are given by:
1.
2.
3.
4.
In a \(\mathrm{p\text{-}n}\) junction diode, the change in temperature due to heating:
1. | affects only reverse resistance. |
2. | affects only forward bias. |
3. | does not affect the resistance of the \(\mathrm{p\text{-}n}\) junction. |
4. | affects the overall \(\mathrm{V\text{-}I}\) characteristics of a \(\mathrm{p\text{-}n}\) junction. |
A small sphere of radius \(r\) falls from rest in a viscous liquid. As a result, heat is produced due to the viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to:
1. \(r^3\)
2. \(r^2\)
3. \(r^5\)
4. \(r^4\)
A sample of \(0.1\) g of water at \(100^{\circ}\mathrm{C}\) and normal pressure (\(1.013 \times10^5\) N m–2) requires \(54\) cal of heat energy to convert it into steam at \(100^{\circ}\mathrm{C}\). If the volume of the steam produced is \(167.1\) cc,
then the change in internal energy of the sample will be:
1. \(104.3\) J
2. \(208.7\) J
3. \(42.2\) J
4. \(84.5\) J
Two wires are made of the same material and have the same volume. The first wire has a cross-sectional area \(A\) and the second wire has a cross-sectional area \(3A\). If the length of the first wire is increased by \(\Delta l\) on applying a force \(F\), how much force is needed to stretch the second wire by the same amount?
1. | \(9F\) | 2. | \(6F\) |
3. | \(4F\) | 4. | \(F\) |
The power radiated by a black body is \(P\) and it radiates maximum energy at wavelength \(\lambda_0\)
1. \( \frac{3}{4} \)
2. \( \frac{4}{3} \)
3. \( \frac{256}{81} \)
4. \( \frac{81}{256}\)
A set of '\(n\)' equal resistors, of value '\(R\)' each, are connected in series to a battery of emf '\(E\)' and internal resistance '\(R\)'. The current drawn is \(I.\) Now, if '\(n\)' resistors are connected in parallel to the same battery, then the current drawn becomes \(10I.\) The value of '\(n\)' is:
1. | \(10\) | 2. | \(11\) |
3. | \(20\) | 4. | \(9\) |
A battery consists of a variable number \(n\) of identical cells (having internal resistance \(r\) each) which are connected in series. The terminals of the battery are short-circuited and the current \(I\) is measured. Which of the graphs shows the correct relationship between \(I\) and \(n?\)
1. | 2. | ||
3. | 4. |
A carbon resistor (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be:
1. Violet - Yellow - Orange - Silver
2. Yellow - Violet - Orange - Silver
3. Yellow - Green - Violet - Gold
4. Green - Orange - Violet - Gold
Which one of the following statements is incorrect?
1. | Rolling friction is smaller than sliding friction. |
2. | Limiting value of static friction is directly proportional to the normal reaction. |
3. | Frictional force opposes the relative motion. |
4. | Coefficient of sliding friction has dimensions of length. |
A moving block having mass \(m\) collides with another stationary block having a mass of \(4m.\) The lighter block comes to rest after the collision. When the initial velocity of the lighter block is \(v,\) then the value of the coefficient of restitution \((e)\) will be:
1. \(0.5\)
2. \(0.25\)
3. \(0.8\)
4. \(0.4\)
A body initially at rest and sliding along a frictionless track from a height \(h\) (as shown in the figure) just completes a vertical circle of diameter \(\mathrm{AB}= D.\) The height \({h}\) is equal to:
1. \({3\over2}D\)
2. \(D\)
3. \({7\over4}D\)
4. \({5\over4}D\)
Three objects, A: (a solid sphere), B: (a thin circular disk) and C: (a circular ring), each have the same mass \(\mathrm{M}\) and radius \(\mathrm{R}.\) They all spin with the same angular speed about their own symmetry axes. The amount of work (\(\mathrm{W}\)) required to bring them to rest, would satisfy the relation:
1. | \(\mathrm{W_C}>\mathrm{W_B}>\mathrm{W_A} ~~~~~~~~\) |
2. | \(\mathrm{W_A}>\mathrm{W_B}>\mathrm{W_C}\) |
3. | \(\mathrm{W_B}>\mathrm{W_A}>\mathrm{W_C}\) |
4. | \(\mathrm{W_A}>\mathrm{W_C}>\mathrm{W_B}\) |
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of \(27^{\circ}\mathrm{C}\), to successive resonances are produced at \(20\) cm and \(73\) cm column length. If the frequency of the tuning fork is \(320\) Hz, the velocity of sound in air at \(27^{\circ}\mathrm{C}\) is:
1. | \(330\) m/s | 2. | \(339\) m/s |
3. | \(350\) m/s | 4. | \(300\) m/s |
An electron falls from rest through a vertical distance \(h\) in a uniform and vertically upward-directed electric field \(E\). The direction of the electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest through the same vertical distance \(h\). The fall time of the electron in comparison to the fall time of the proton is:
1. | smaller | 2. | \(5\) times greater |
3. | \(10\) times greater | 4. | equal |
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m/s2 at a distance of 5 m from the mean position. The time period of oscillation is:
1. | 2 s | 2. | s |
3. | 2 s | 4. | 1 s |
The electrostatic force between the metal plates of an isolated parallel plate capacitor \(C\) having a charge \(Q\) and area \(A\) is:
1. | independent of the distance between the plates |
2. | linearly proportional to the distance between the plates |
3. | proportional to the square root of the distance between the plates |
4. | inversely proportional to the distance between the plates |
An electron of mass m with an initial velocity \(\vec v= v_0\hat i\)\( ( v_o > 0 ) \) enters in an electric field\(\vec E = -E_0 \hat i (E_0 = \text{constant}>0)\) at \(t=0\). If \(\lambda_0\)\(\lambda_0\)
1. \(\frac{\lambda_0}{\left(1+ \frac{eE_0}{mv_0}t\right)}\)
2. \(\lambda_0\left(1+ \frac{eE_0}{mv_0}t\right)\)
3. \(\lambda_0 t\)
4. \(\lambda_0\)
For radioactive material, the half-life is \(10\) minutes. If initially, there are \(600\) number of nuclei, the time taken (in minutes) for the disintegration of \(450\) nuclei is :
1. \(20\)
2. \(10\)
3. \(30\)
4. \(15\)
When the light of frequency \(2\nu_0\)(where \(\nu_0\) is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is \(v_1\). When the frequency of the incident radiation is increased to \(5\nu_0,\) the maximum velocity of electrons emitted from the same plate is \(v_2.\) What will be the ratio of \(v_1\) to \(v_2\)?
1. | \(1:2\) | 2. | \(1:4\) |
3. | \(4:1\) | 4. | \(2:1\) |
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:
1. \(1:1\)
2. \(1:-1\)
3. \(2:-1\)
4. \(1:-2\)
The moment of the force, \(\overset{\rightarrow}{F} = 4 \hat{i} + 5 \hat{j} - 6 \hat{k}\) at point (\(2,\) \(0,\) \(-3\)) about the point (\(2,\) \(-2,\) \(-2\)) is given by:
1. \(- 8 \hat{i} - 4 \hat{j} - 7 \hat{k}\)
2. \(- 4 \hat{i} - \hat{j} - 8 \hat{k}\)
3. \(- 7 \hat{i} - 8 \hat{j} - 4 \hat{k}\)
4. \(- 7 \hat{i} - 4 \hat{j} - 8 \hat{k}\)
A block of mass \(m\) is placed on a smooth inclined wedge \(ABC\) of inclination \(\theta\) as shown in the figure. The wedge is given an acceleration '\(a\)' towards the right. The relation between \(a\) and \(\theta\) for the block to remain stationary on the wedge is:
1. \(a = \frac{g}{\text{cosec}\theta}\)
2. \(a = \frac{g}{\text{sin}\theta}\)
3. \(a = g~\text{cos}\theta\)
4. \(a = g~\text{tan}\theta\)
A toy car with charge \(q\) moves on a frictionless horizontal plane surface under the influence of a uniform electric field \(\vec E.\)Due to the force \(q\vec E,\) its velocity increases from \(0\) to \(6~\text{m/s}\) in a one-second duration. At that instant, the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between \(0\) to \(3\) seconds are respectively:
1. \(2~\text{m/s}, ~4~\text{m/s}\)
2. \(1~\text{m/s}, ~3~\text{m/s}\)
3. \(1~\text{m/s}, ~3.5~\text{m/s}\)
4. \(1.5~\text{m/s},~ 3~\text{m/s}\)
A student measured the diameter of a small steel ball using a screw gauge of least count \(0.001\) cm. The main scale reading is \(5\) mm and zero of circular scale division coincides with \(25\) divisions above the reference level. If the screw gauge has a zero error of \(-0.004\) cm, the correct diameter of the ball is:
1. \(0.521\) cm
2. \(0.525\) cm
3. \(0.053\) cm
4. \(0.529\) cm
Unpolarised light is incident from the air on a plane surface of a material of refractive index \(\mu\). At a particular angle of incidence \(i\), it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
1. | the reflected light is polarised with its electric vector parallel to the plane of incidence. |
2. | the reflected light is polarised with its electric vector perpendicular to the plane of incidence. |
3. | \(i = \text{sin}^{-1}\frac{1}{\mu}\) |
4. | \(i = \text{tan}^{-1}\frac{1}{\mu}\) |
In Young's double-slit experiment, the separation \(d\) between the slits is \(2~\text{mm}\), the wavelength \(\lambda\) of the light used is \(5896~\mathring{\text{A}}\) and distance \(D\) between the screen and slits is \(100~\text{cm}\). It is found that the angular width of the fringes is \(0.20^{\circ}\). To increase the fringe angular width to \(0.21^{\circ}\) (with same \(\lambda\) and \(D\)) the separation between the slits needs to be changed to:
1. \(1.8~\text{mm}\)
2. \(1.9~\text{mm}\)
3. \(2.1~\text{mm}\)
4. \(1.7~\text{mm}\)
An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:
1. | small focal length and large diameter. |
2. | large focal length and small diameter. |
3. | large focal length and large diameter. |
4. | small focal length and small diameter. |
The volume (\(V\)) of a monatomic gas varies with its temperature (\(T\)), as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state \(\mathrm{A}\) to state \(\mathrm{B}\) will be:
1. | \(2 \over 5\) | 2. | \(2 \over 3\) |
3. | \(1 \over 3\) | 4. | \(2 \over 7\) |
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is \(20~\text{cm}\), the length of the open organ pipe is:
1. \(13.2~\text{cm}\)
2. \(8~\text{cm}\)
3. \(12.5~\text{cm}\)
4. \(16~\text{cm}\)
The efficiency of an ideal heat engine (Carnot heat engine) working between the freezing point and boiling point of water is:
1. \(26.8\%\)
2. \(20\%\)
3. \(6.25\%\)
4. \(12.5\%\)
At what temperature will the \(\text{rms}\) speed of oxygen molecules become just sufficient for escaping from the earth's atmosphere?
(Given: Mass of oxygen molecule \((m)= 2.76\times 10^{-26}~\text{kg}\), Boltzmann's constant \(k_B= 1.38\times10^{-23}~\text{J K}^{-1}\))
1. \(2.508\times 10^{4}~\text{K}\)
2. \(8.360\times 10^{4}~\text{K}\)
3. \(5.016\times 10^{4}~\text{K}\)
4. \(1.254\times 10^{4}~\text{K}\)
1. | \(7.14\) A | 2. | \(5.98\) A |
3. | \(14.76\) A | 4. | \(11.32\) A |
An inductor of \(20~\text{mH}\), a capacitor of \(100~\mu \text{F}\), and a resistor of \(50~\Omega\) are connected in series across a source of emf, \(V=10 \sin (314 t)\). What is the power loss in this circuit?
1. \( 0.79 ~\text{W} \)
2. \( 0.43 ~\text{W} \)
3. \( 2.74 ~\text{W} \)
4. \( 1.13 ~\text{W}\)
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from:
1. | the current source |
2. | the magnetic field |
3. | the lattice structure of the material of the rod |
4. | the induced electric field due to the changing magnetic field. |
The current sensitivity of a moving coil galvanometer is \(5~\text{div/mA}\) and its voltage sensitivity (angular deflection per unit voltage applied) is \(20~\text{div/V}\). The resistance of the galvanometer is:
1. \(40~\Omega\)
2. \(25~\Omega\)
3. \(250~\Omega\)
4. \(500~\Omega\)
If the mass of the sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following statements would not be correct?
1. | Raindrops would drop faster. |
2. | Walking on the ground would become more difficult. |
3. | Time period of a simple pendulum on the earth would decrease. |
4. | Acceleration due to gravity \((g)\) on earth would not change. |
A solid sphere is in rolling motion. In rolling motion, a body possesses translational kinetic energy (Kt) as well as rotational kinetic energy (Kr) simultaneously. The ratio Kt : (Kt + Kr) for the sphere will be:
1. 7:10
2. 5:7
3. 10:7
4. 2:5
The kinetic energies of a planet in an elliptical orbit around the Sun, at positions \(A,B~\text{and}~C\) are \(K_A, K_B~\text{and}~K_C\) respectively. \(AC\) is the major axis and \(SB\) is perpendicular to \(AC\) at the position of the Sun \(S\), as shown in the figure. Then:
1. | \(K_A <K_B< K_C\) | 2. | \(K_A >K_B> K_C\) |
3. | \(K_B <K_A< K_C\) | 4. | \(K_B >K_A> K_C\) |
A solid sphere is rotating freely about its axis of symmetry in free space. The radius of the sphere is increased keeping its mass the same. Which of the following physical quantities would remain constant for the sphere?
1. | angular velocity |
2. | moment of inertia |
3. | rotational kinetic energy |
4. | angular momentum |