AIIMS Full Mock Test 3


200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test 3


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This mock test of AIIMS Full Mock Test 3 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test 3 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test 3 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test 3 exercise for a better result in the exam. You can find other AIIMS Full Mock Test 3 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

A device which converts electrical energy into mechanical energy is

Solution:
QUESTION: 2

Continuous emission spectrum is produced by

Solution:
QUESTION: 3

Three condenser of capacity C each are joined first in series and then in parallel. The capacity becomes n times, where n is

Solution: In first case when they are connected in series their equivalence is C/3 and in parallel that is 3C so 3C is 9times of C/3
QUESTION: 4

A ball is dropped from a height h to the ground. If the coefficient of restitution is 'e' the height to which the ball goes up after it rebounds for nth time is

Solution:
QUESTION: 5

If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same

Solution:
QUESTION: 6

Two resistors whose value are in ratio 2 : 1 are connected in parallel with one cell. Then ratio of power dissipated is

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QUESTION: 7

What will be the ratio of de-Broglie wavelengths of proton and α− particle of same energy

Solution:
QUESTION: 8

The pH of the mixture obtained when equal volumes of N/10 NaOH and N/20 HCI are mixed, is

Solution:
QUESTION: 9

An electron of charge 'E' is liberated from a hot filament and attracted by an anode of potential 'V' volts positive with respect to the filament. The speed of the electron of mass m when it strikes the anode is

Solution:
QUESTION: 10

The working of a dynamo is based on principle of

Solution:
QUESTION: 11

If the no. of turns of a solenoid are doubled and its length is halved keeping the area of cross-section same, then ratio of initial and final self-inductances will be

Solution:
QUESTION: 12

An L.C. circuit contains 10 mH inductor and a 25 μF capacitor. The resistance of the circuit is negligible. The energy stored in the circuit is completely magnetic at time (in milli seconds) being measured from the instant when the circuit is closed

Solution:
QUESTION: 13

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

Solution:
QUESTION: 14

The fact that radiosignals reach the earth from outside the atmosphere, was discovered accidently by

Solution:
QUESTION: 15

There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60° with x-axis is 4 J, then what is the value of E?

Solution:
QUESTION: 16

An electric dipole is kept in a uniform electric field. It experiences

Solution:
QUESTION: 17

If the linear momentum is increased by 50%, the kinetic energy will increase by

Solution:
QUESTION: 18

Two bodies of mass m₁ and m₂ have equal kinetic energies. If p₁ and p₂ are their respective momentum, then ratio p₁ : p₂ is equal to

Solution:
QUESTION: 19

Two circular discs A and B with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

Solution:
QUESTION: 20

A ferromagnetic material is heated above its Curie temperature. Which one is a correct statement ?

Solution:
QUESTION: 21

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V a.c., supply line. The power drawn by the combination in each case respectively will be

Solution:
QUESTION: 22

The magnetic lines of force inside a bar magnet

Solution:
QUESTION: 23

According to the Hooke's law, if stress is increased, then ratio of stress to strain

Solution:
QUESTION: 24

An object with a mass of 10 kg moves at a constant velocity of 10m/s. A constant force then acts for 4 sec on the object and gives it a speed of 2m/sec in opposite direction. The acceleration produced in it is,

Solution:
QUESTION: 25

In radioactive decay, the emitted electrons come from

Solution:
QUESTION: 26

One of the two clocks on the earth is controlled by a pendulum and other by a spring. If both the clocks are taken to the moon, then which clock will have same time period as that on the earth?

Solution:
QUESTION: 27

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): When light goes from a medium of refraction index 1.5 to a medium of refraction index, 1.6, its speed decreases by 1.875 * 108 m/s.
Reason(R): Refraction index = speed of light in vacuum speed of light in air

Solution:
QUESTION: 28

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A steady current flows in a metallic coductor of non-uniform cross-section. Only drift a speed remains constant along the length of the conductor.
Reason(R): vs = one A (symbols have their usual meaning).

Solution:
QUESTION: 29

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Nuclei having number about 60 are most stable.
Reason(R): When two or more light nuclei are combined into a heavier nucleus, then the binding energy per nucleon will increase.

Solution:
QUESTION: 30

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Pendulum of a clock is made of alloys and not of pure metals.
Reason(R): Use of alloys make the pendulum look good.

Solution:
QUESTION: 31

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Water at 4oC will overflow from a filled container both on heating as well cooling.
Reason(R): Process of regelation is responsible for the expansion of water at 4oC.

Solution:
QUESTION: 32

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Two parallel wires carrying current in the same direction attract each other.
Reason(R): Two similar charges moving parallel to each other in same direction repel each other.

Solution:
QUESTION: 33

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): For stable equilibrium, Force has to be zero and potential energy should be minimum.
Reason(R): For equilibrium, it is not necessary that the force is not zero.

Solution:
QUESTION: 34

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Frictional forces are conservative.
Reason(R): Potential energy can be associated with frictional forces.

Solution:
QUESTION: 35

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Thermistor is a device to detect small change in temperature.
Reason(R): The magnitude of the temperature coefficient of resistivity is often quite large for semiconducting material.

Solution:
QUESTION: 36

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Current is passed through a metallic wire heating it red. When cold water is poured on half of its portion, the rest of half portion becomes more hot.
Reason(R): Resistance decreases due to decrease in temperature and then current through wire increases.

Solution:
QUESTION: 37

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If the string of a descending lift is broken, then it will fall down like a free body.
Reason(R): The acceleration of a free body is always 'g'.

Solution:
QUESTION: 38

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If a body is not in rest position then the net external force acting on it cannot be zero.
Reason(R): If a body is moving with uniform speed it will continue doing so unless frictional force exceeds the force of motion.

Solution:
QUESTION: 39

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Nuclear fission is the basis of a hydrogen bomb.
Reason(R): Fission bomb is much more powerful and destructive than the fission bomb.

Solution:
QUESTION: 40

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Radioactive substances emit both α and β-particles simultaneously.
Reason(R): Any radioactive substance does not have a single element only, but all those elements which are being formed by radioactive emission are present in it.

Solution:
QUESTION: 41

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): When charges are shared between two bodies, there occurs loss of energy.
Reason(R): In case of sharing of charges, conservation of energy fails.

Solution:
QUESTION: 42

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): β-particles are those electrons that were revolving around the nucleus of the atom.
Reason(R): β-particles have the same charge as that of electron.

Solution:
QUESTION: 43

If the de Broglie wavelengths for a proton and for a α-particle are equal, then the ratio of their velocities will be

Solution:
QUESTION: 44

The drift velocity of the electron is doubled if the applied electric field across the conductance is halved.
Reason(R): Drift velocity ∝ 1 Electric field

Solution:
QUESTION: 45

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Hot wire instrument is based on the principle of heating effect of current.
Reason(R): Only A.C. can be measured by hot-wire instrument.

Solution:
QUESTION: 46

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The principle of homogeneity of dimensions state that dimensions on both sides of equation must be same
Reason (R) : An equation which is dimensionally correct is also practically correct

Solution:
QUESTION: 47

An electric motor creates a tension of 4500 newton in a hoisting cable and reels it in at the rate of 2 m/sec. What is the power of electric motor

Solution:
QUESTION: 48

If intensity of incident light is increased in PEE then which of the following is true

Solution:
QUESTION: 49

According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal versus frequency of the incident radiation gives a straight line, whose slope

Solution:
QUESTION: 50

The working of a dynamo is based on principle of

Solution:
QUESTION: 51

A particle reaches its highest point when it has covered exactly one half of its horizontal range. The correspponding point on the displacement time graph is characterised by

Solution:
QUESTION: 52

Doping of a semiconductor (with small traces of impurity atoms) generally changes the resistivity as follows:

Solution:
QUESTION: 53

In an unbiased p-n junction, holes diffuse from the p-region to n-region because

Solution:

In an unbiased p-n junction, hole concentration in p-region is more than in n-region and due to difference in concentration of charge carriers, holes diffuse from p-region to n-region.

QUESTION: 54

The neutral temperature is the mean of the temperatures of

Solution:
QUESTION: 55

The study of forces and their effect on the objects is studied under

Solution:
QUESTION: 56

Unit of stress are

Solution:
QUESTION: 57

What is the effect on the interference fringes in a Young's double slit experiment, if the monochromatic source is replaced by another monochromatic source of shorter wavelength?

Solution:
QUESTION: 58

Soap bubble looks coloured due to

Solution:
QUESTION: 59

Two coherent light beams of intensity I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are

Solution:
QUESTION: 60

A car travelling at a speed of 30 km/hr is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hr, it can be brought to a halt with the same braking force in

Solution:
QUESTION: 61

Which of the following processes is employed to convert alkyl halide into alcohol?

Solution:
QUESTION: 62

A solution of 10 mL of M/10 FeSO₄ was titrated with KMnO₄ solution in acidic medium, the amount of KMnO₄ used will be

Solution:
QUESTION: 63

The hydrogen phosphate of certain metal has formula MHPO₄. The formula of metal chloride would be

Solution:
QUESTION: 64

Which of the following is formed when toluene reacts with a mixture of concentrated nitric acid and concentrated sulphuric acid?

Solution:
QUESTION: 65

The ortho/para directing group among the following is

Solution:
QUESTION: 66

In graphite, the electrons are

Solution:
QUESTION: 67

The most reactive compound for electrophilic nitration is

Solution:
QUESTION: 68

Freon is used as a

Solution:
QUESTION: 69

Among the following compounds, which has a dipole moment greater than zero?

Solution:
QUESTION: 70

Which of the following statements about the catalyst is true?

Solution:
QUESTION: 71

The order of reaction is decided by

Solution:
QUESTION: 72

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Hydrometallurgy and pyro-metallurgy is essentially same.
Reason(R): Both involve heating With water.

Solution:
QUESTION: 73

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Magnetic moment value for copper (II) acetate is less than that for one unpaired electron.
Reason(R): Interaction between unpaired electrons belonging to different copper atoms occurs via bridging acetate group.

Solution:
QUESTION: 74

Calculate Δ H in KJ for the following reaction Cs + O2g → CO2g Given that
H2Og + Cg → COg + H2g , ΔH = + 131 kJ
COg + 12O2g → CO2g , ΔH = − 282 kJ
H2g + 12O2g → H2Og , ΔH = − 242 k J

Solution:
QUESTION: 75

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If two moles of AgNO3 and 2 moles Cu are reacted , then AgNO3 is the limiting reactant.
Reason(R): AgNO3 is left in excess and copper is consumed fully.

Solution:
QUESTION: 76

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Critical temperature is the temperature at which the real gas exhibits ideal behaviour for considerable range of pressure.
Reason(R): At critical temperature, the densities of a substance in gaseous and liquid states are same.

Solution:
QUESTION: 77

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):But-2-ene shows geometrical isomerism but but-1-ene does not show.
Reason(R):Geometrical isomersim arises due to the restricted rotation of the double bond.

Solution:
QUESTION: 78

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Molarity is a convenient concentration unit.
Reason(R): Number of moles of solution can be calculated with ease No.of moles = Volume of solution Moles of solution 1L solution

Solution:
QUESTION: 79

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): [CO(en)3]Cl3 complex is more stable than [CO(NH3)6]Cl3 complex.
Reason(R): Ethylenediamine is a bidentate ligand.

Solution:
QUESTION: 80

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A mixture of the solutions of a weak acid and its sodium salt acts as a good buffer.
Reason(R): The ratio of the sale to acid in the mixture does not change substantially when small amounts of acids or alkalies are added to the buffer.

Solution:
QUESTION: 81

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Al forms [AIF6]3- but B does not form [BF6]3-.
Reason(R): B does not react with F2.

Solution:
QUESTION: 82

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Black body radiation and photoelectric effect were limitations of electromagnetic wave theory.
Reason (R): Planck's quantum theory explained them.

Solution:
QUESTION: 83

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The ease of dehydration of alcohols follows the order. Primary>Secondary>Tertiary.
Reason(R): Dehydration proceeds through the formation of oxonium ions.

Solution:
QUESTION: 84

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): CH3COOH but not HCOOH can be halogenated in presence of red P and Cl2.
Reason(R): Both formic acid and CH3COOH are highly soluble in water.

Solution:
QUESTION: 85

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Ethyl xanthate is used as a collector in floatation process.
Reason(R): Collectors depress the floatation property of one of the components of the ore and thus help in the separation of different minerals present in the same ore.

Solution:
QUESTION: 86

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The rest mass for electron is 0.0005486 u.
Reason (R): Electron is assumed moving while calculating rest mass.

Solution:
QUESTION: 87

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Acetic acid in vapour state shows a molecular mass of 120.
Reason(R): It undergoes intermolecular hydrogen bonding.

Solution:
QUESTION: 88

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Aniline is stronger base than ammonia.
Reason(R): In aniline electron density decreases at nitrogen due to mesomeric effect.

Solution:
QUESTION: 89

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Trans[Co(en)2Br2]Cl does not show optical activity.
Reason(R): Above coplex can exhibit ionisation isomerism.

Solution:
QUESTION: 90

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Valcanisation depends upon the amount of sulphur used.
Reason(R): Vulcanisation involves cooling of rubbers.

Solution:
QUESTION: 91

The e.m.f. of a galvanic cell with electrode potentials of silver equal to + 0.80 V and that of copper equal to + 0.34 V is

Solution:
QUESTION: 92

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Soap and detergent are macro-molecular colloids.
Reason(R): Soap and detergent are molecules of large size.

Solution:
QUESTION: 93

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Methyl isocyanide can be hydrolysed by acids but not by alkalies.
Reason(R): The carbon atom of isocyanide group in methyl isocyanide carries a negative charge which readily accepts the proton but repels the OH- ion.

Solution:
QUESTION: 94

Which one of the following types of Laser is used in Laser Printers?

Solution:
QUESTION: 95

The molecular weight of methane is 16. If the pressure of this gas changes from 1 atm to 2 atm, then volume occupied by 1.6 g of this gas will be

Solution:
QUESTION: 96

Sodium burns in air and gives

Solution:
QUESTION: 97

An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of

Solution:
QUESTION: 98

Which of the following compounds is used in gun powder?

Solution:
QUESTION: 99

Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 90oC?

Solution:
QUESTION: 100

The solubility AgCl will be minimum in

Solution:
QUESTION: 101

Neutralization reaction in water is best represented by

Solution:
QUESTION: 102

The concept that acid is proton donor and base is proton acceptor was given by

Solution:
QUESTION: 103

A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour is noted, which cation would be present?

Solution: Because Be have no colour in Bunsen flame.
QUESTION: 104

Which of the following solution cannot act as a buffer ?

Solution:
QUESTION: 105

The percentage by weight of hydrogen in H₂O₂ is

Solution:
QUESTION: 106

Clemmensen reduction of a ketone is carried out in presence of

Solution:
QUESTION: 107

The addition of HBr to alkenes in the presence of peroxides is called :

Solution:
QUESTION: 108

Reduction with aluminium isopropoxide in excess of Isopropyl alcohol is called Meerwein Ponndroff-Verley reduction. What will be the final product when cyclohex-2-enone is selectively reduced in MPV reaction ?

Solution:
QUESTION: 109

Which gives more stable product ?

Solution:
QUESTION: 110

Which does not contain conjugate system?

Solution:

In dienes, when the double bonds connected to each other by a single bond, this arrangement is known as conjugated.

QUESTION: 111

Which is not the resonance structure of aniline?

Solution:
QUESTION: 112

Ultra-silicon is prepared by the process of

Solution:
QUESTION: 113

Which type of glass has a property to cut off ultra-violet rays?

Solution:
QUESTION: 114

Which one of the following solutions would produce maximum elevation in B.P. ?

Solution:
QUESTION: 115

Schottky defect is observed in the crystal of

Solution:
QUESTION: 116

One of the following is false for Hg?

Solution:
QUESTION: 117

The ratio of the value of any colligative property for KCl solution to that of sugar solution is nearly

Solution:
QUESTION: 118

Which of the following 0.10 m aqueous solutions will have lowest freezing point ?

Solution:
QUESTION: 119

Geometric isomerism will be exhibited by

Solution:

In this compound both the carbon atoms bonded by the double bond have two different group attached to them

QUESTION: 120

If 30 g of Mg and 30 g of oxygen are reacted, then the residual mixture contains

Solution:
QUESTION: 121

Ligament connects

Solution:
QUESTION: 122

Pneumatic bones, four chambered heart and feathers occur in

Solution:
QUESTION: 123

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Thick cuticle is mostly present in disease resistant plants.
Reason(R): Disease causing agents cannot grow on cuticle and cannot invade the cuticle.

Solution:

The transformation of cellulose or pectic substances of the primary or secondary wall into cutin, which forms a continuous layer, called the cuticle. It generally forms the skin or outermost covering of the stem, leaves and some fruits. A thick cuticle layer serves as a barrier against fungal disease. Cuticle play a structural barrier and it contain substances of high wax content which the fungus finds difficult to penetrate.

QUESTION: 124

Eggs of Anopheles are found

Solution:
QUESTION: 125

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Severe Acute Respiratory Syndrome (SARS) originated in China.
Reason(R): China is the most poulated country of the world.

Solution:

Severe Acute Respiratory Syndrome (SARS) a severe acute type of pneumonia caused by metapneumo virus was first reported in China.
Though China is the most populated country of the world it is not directly responsible for the origin of SARS. The killer pneumonia virus is responsible for SARS origin.

QUESTION: 126

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Endomycorrhiza of forest trees contribute to the efficient nutrient cycling in tropical forest ecosystems.
Reason(R): The fungi that form endomycorrhizal associations with plants store nutrient ions and make them available to the host plants.

Solution:

The fungi of endotrophic mycorrhiza invade the cells of the root cortex, with a portion lying externally as a loose mass of hyphae in the soil. These mycorrhizas are found in the families of Ericales, Orchidaceae and Gentiaceae. Mycorrhizas cause considerable stimulation to groth in nutrient deficient soils.The greatest stimulation occurs in the uptake of phosphates. Mycorrhizas can take up phosphate at that low concentrations at which they are unavailable to non-mycorrhizal roots.

QUESTION: 127

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Adenine cannot pair with cytosine.
Reason(R): Because there would be two hydrogen atoms one at the bonding positions and one at the other.

Solution:

The purine and pyrimidine bases pair only in certain combinations. Adenine pairs with thymine (A:T) and guanine with cytosine (G:C). Adenine and thymine are joined by two hydrogen bonds ( A ═ T ) Cytosine and guanine are joined by three hydrogen bonds ( G ≡ C ) through positions 6', 1' and 2'.

QUESTION: 128

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Extra whorl of calyx is called epicalyx.
Reason (R): Epicalyx is present as inner series of calyx.

Solution:
QUESTION: 129

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Generally the intraspecific competition is more intense than interspecific competition.
Reason (R): Intraspecific competition occurs when the resources are in short supply.

Solution:
QUESTION: 130

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): WBCs accumulate at the site of wounds by diapedesis.
Reason(R): It is the squeezing of leucocytes from the endothelium.

Solution:

During a wound germs are removed by the process of phagocytosis by WBCs. WBCs accumulate at the site of wound by diapedesis. Diapedesis is the sqeezing of leucocytes out from the endothelium of capillaries to fight against foreign agent.

QUESTION: 131

In the following questions, a statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the statements carefully and mark the answer-
Assertion (A): Leucoplasts give rise to other types of plastids.
Reason (R): Chromoplasts do not get changed to other types of plastids.

Solution:
QUESTION: 132

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): In a food chain members of successive higher levels are fewer in number.
Reason(R): Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

Solution:

In a parasitic food chain the pyramids are always inverted. This is due to the fact that a single plant may support the growth of many herbivores and each herbivore in turn may provide nutrition to several parasites there is a reverse position, which means the number of organisms gradually show an increase.

QUESTION: 133

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Ionizing radiations are harmful for the living organism.
Reason(R): They form toxic photoproducts in the cells.

Solution:

The ionizing radiations can have direct effect on chromosomes. They may directly break chromosomes or alter one of the DNA bases or indirectly may initiate a chain of chemical reactions. The biological effect also depends on the kind of cell and stage of nuclear cycle.

QUESTION: 134

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): The main function of suspensor is to provide nutrition to embryo.
Reason (R): It is attached to embryo by hypophysis.

Solution:
QUESTION: 135

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): In alcoholic drink, the alcohol is converted into glucose in the liver.
Reason(R): Liver cells are able to produce glucose from alcohol by back fermentation.

Solution:

Absorbed alcohol is carried directly to the liver, where it becomes the preferred fuel. Use of moderate amounts of alcohol does not cause liver damage provided adequate nutrition is maintained. The liver becomes enlarged yellow greasy and firm.Hepatocytes are distended by large fat globules which push the hepatocyte nucleus against the cell membrane. Accumulation of fat in the liver of the alcoholic person results from the combination of impaired fatty acid oxidation, increased uptake and esterification of fatty acids to form triglycerides and diminshed lipoprotein biosynthesis and secretion, it means there is increase in the fat synthesis in the liver.

QUESTION: 136

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Cytochromes are only found in mitochondria.
Reason (R): Cytochrome b 5 occurs in the endoplasmic reticulum.

Solution:
QUESTION: 137

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Study of biology requires basic knowledge of chemistry and physics.
Reason(R): Living organisms are made up of atoms and molecules which follow chemical and physical laws.

Solution:

The field of biology is getting advanced day by day to such an extent that basci knowledge of physics, chemistry and other sciences is necessarily required.All the living organisms are made up of atoms and molecules which follow certain laws associated with them. Therefore it becomes essential to have the knowledge of chemical and physical sciences also.

QUESTION: 138

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Old age is not an illness. It is a continuation of life with decreasing capacity for adaptation.
Reason(R): Cessation of mitosis is a normal genetically programmed event.

Solution:

Old age is the result of ageing or senescence which may be defined as the progressive deterioration in structure and function of the body cells, tissues, organs and organ systems of the organism with their advancing age.In old age the body's immune system loses its ability to effectively deal with the antigens. This reduces the resistance as well as adaptation of the body.
Cessation of mitosis is not as such a genetically programmed event. During ageing, there is a decrease in multiplication of cells though it differs in various tissues.

QUESTION: 139

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Piper nigrum shows the presence of perisperm.
Reason (R): The persistent nucellus is called perisperm.

Solution:
QUESTION: 140

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Pollution is always caused by human activites.
Reason(R): Pollution is not different from contamination.

Solution:

Pollution is an undesirable change in thephysical, chemical or biological characteristics of our air, water and land that may or will harmfully affect human lives or other organism. Pollution can be natural or man made. Natural pollution comes from volcanic reuptions, emission of natural gas, soil erosion, ultraviolet rays, etc. Most of the pollution is man-made. Contamination occurs due to the presence of harmful organisms or their porducts or undesirable porducts in a desirable product causing disease or discomfort, for the organism who consume it. Therefore pollution and contamination are two different things.

QUESTION: 141

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): DNA code is not copied in the synthesis of transfer RNA.
Reason(R): Transfer RNA move out of the nucleus and after attaching on the ribosomes, form the template.

Solution:

tRNA is synthesized in the nucleus as a DNA template. Only 0.025% of DNA codes for tRNA. tRNA is an exception to other cellular RNAs in that a part of its ribonucleotide sequence (-CCA) is added after it comes off the DNA template tRNA is formed from only a small part of DNA molecule. Therefore, it does not show any obvious base relationship to DNA.

QUESTION: 142

In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Our body secretes adrenaline in intense cold.
Reason(R): Adrenaline raises metabolic rate.

Solution:

Adrenalin is a catecholamine hormone,a lso known as epinephrine, secreted by the mammalian adrenal medulla as well as the adrenergic nerve endings. Its secretion is stimulated by the sympathetic nervous system under conditions of stress.
Adrenaline stimulates blood flow to skeletal muscles and increases blood glucose levels. It also raises metabolic rate.

QUESTION: 143

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Natural germination inhibitors do not affect the viability of seeds.
Reason (R): Natural germination inhibitors may be found inside as well as outside of the seed.

Solution:
QUESTION: 144

Cellulose occurs in

Solution:
QUESTION: 145

R.Q. is more than one in case of-

Solution:
QUESTION: 146

Which of the following can fix atmospheric nitrogen?

Solution:
QUESTION: 147

The function of the nodes in the lymphatic system is to

Solution:
QUESTION: 148

Nucleotide on hydrolysis does not give :

Solution:
QUESTION: 149

The flax fibres are obtained from

Solution:
QUESTION: 150

Which of the following are liver waste products?

Solution:
QUESTION: 151

A gene which synthesises a repressor protein is

Solution:
QUESTION: 152

Which one is correct

Solution:
QUESTION: 153

Manipulation of DNA in genetic engineering became possible due to the discovery of

Solution:
QUESTION: 154

Cocaine is obtained from

Solution:
QUESTION: 155

Red:Pink:white is an example of

Solution:
QUESTION: 156

In Drosophilia the XXY constitution determines

Solution:
QUESTION: 157

Humoral immunity is due to

Solution:
QUESTION: 158

Some bacteria are not easily killed because of

Solution:
QUESTION: 159

Segments of antigen that are recognised by antibody are

Solution:
QUESTION: 160

In cyathium the ratio between female to male flowers is

Solution:
QUESTION: 161

Rh factor is named after

Solution:
QUESTION: 162

Resistance against disease is provided by

Solution:
QUESTION: 163

Sulphur is absorbed by plants as

Solution:
QUESTION: 164

Main substance involved in transfer of electrons in photosynthesis is

Solution:
QUESTION: 165

The law of limiting factors for photosynthesis was enunciated by

Solution:
QUESTION: 166

The scientist to isolate streptomycin for the first time is

Solution:
QUESTION: 167

The speed of a nerve impulse along a sensory neuron depends on the

Solution:
QUESTION: 168

Mule is product of

Solution:
QUESTION: 169

Basic difference between vessel and tracheid is in

Solution:
QUESTION: 170

Sclereids belong to

Solution:
QUESTION: 171

Minamata and itai-itai are caused by pollution of

Solution:
QUESTION: 172

Which of the following amino acid has been regarded as a ketogenic amino acid ?

Solution:
QUESTION: 173

In angiosperms, endosperm is formed by

Solution:
QUESTION: 174

Which of the following would be affected by removal of the prostate gland?

Solution:
QUESTION: 175

Vas deferens is a part of

Solution:
QUESTION: 176

Oxygen-poor blood becomes oxygen-rich blood at the

Solution:
QUESTION: 177

Maintenance of favourable internal conditions despite changes in the environment through self-regulating mechanism is called

Solution:
QUESTION: 178

Transcriptional control in eukaryotes may involve changes in :

Solution:
QUESTION: 179

Hybrid breakdown is failure of

Solution:
QUESTION: 180

Smallest bone in rabbit and man is

Solution:
QUESTION: 181

The ‘Internationally Recommended Transit Corridor’, where naval ships escort merchant ships, is located in the