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# AIIMS Full Mock Test 4

## 200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test 4

Description
This mock test of AIIMS Full Mock Test 4 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test 4 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test 4 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test 4 exercise for a better result in the exam. You can find other AIIMS Full Mock Test 4 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

Solution:
QUESTION: 3

### Three capacitors each of capacitance C and of breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination will be:

Solution:
QUESTION: 4

A particle falls from a height 'h' upon a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, the total distance travelled before rebounding has stopped is

Solution:
QUESTION: 5

Potentiometer measures potential more accurately because

Solution:
QUESTION: 6

An electron is moving with constant velocity along x-axis. If a uniform electric field is applied along y-axis, then its path in the x-y plane will be

Solution:
QUESTION: 7

Cathode rays can be deflected by

Solution:
QUESTION: 8

Uncertainty in position of the electron is of the order of de-Broglie wavelength. Making use of Heisenberg's uncertainty principle, it will be found that uncertainty in velocity ν is of the order of

Solution:
QUESTION: 9

Light of frequency 4v₀ is incident on the metal of the threshold frequency v₀. The maximum kinetic energy of the emitted photoelectrons is

Solution:
QUESTION: 10

A circular ring of area of 0.5 m2 is situated in a non-uniform magnetic field of 4T changing in 2s and making an angle of 60º with the magnetic field. The magnitude of the induced e.m.f. will be

Solution:
QUESTION: 11

What is increased in a step-down transformer

Solution:
QUESTION: 12

A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is

Solution:
QUESTION: 13

A coil of inductances 300mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

Solution:
QUESTION: 14

The displacement current arises when electric field in a region

Solution:
QUESTION: 15

A 10 μF capacitor is charged to a potential difference 50 V and it is then connected to another uncharged capacitor in parallel. If common potential difference becomes 20 V, then capacitance of the second capacitor is

Solution:
QUESTION: 16

A light and a heavy body have equal momentum Which one has greater Kinetic Energy?

Solution:
QUESTION: 17

If electric flux entering and leaving an enclosed surface is φ₁ and φ₂ respectively, the electric charge inside the enclosed surface will be

Solution:
QUESTION: 18

A body of mass 2 kg is projected vertically upwards with a velocity of 2 m sec⁻1. The K.E. of the body just before striking the ground is

Solution:
QUESTION: 19

The original temperature of a black body is 727ºC. The temperature at which this black body must be raised so as to double the total radiant energy, is

Solution:
QUESTION: 20

A 4μ F conductor is charged to 400 volts and then its plates are joined through a resistance of 1 k Ω. The heat produced in the resistance is

Solution:

The energy stored in the capacitor = 1/2 cv2 i.e. - This energy will be converted into heat in the resistor

QUESTION: 21

Curie temperature of iron is the temperature below which it is

Solution:
QUESTION: 22

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved by rotating from above position, the angle by which it is to be rotated is

Solution:
QUESTION: 23

The extension in a string, obeying the Hooke's law, is x. The speed of sound in the stretched string is v. If the string is extended to 1.5 x, then speed of sound will be

Solution:

Speed of sound in a stretched string v Where T is the tension in the string and μ is mass per unit length
According to Hooke's law, F ∝ x
∴ T ∝ x .....(ii) QUESTION: 24

A cold soft drink is kept on the balance. When the cap is open, then the weight

Solution:
QUESTION: 25

The half-life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce to

Solution:
QUESTION: 26

Two simple harmonic motions with the same frequency act on a particle at right angles i.e., along x and y-axis. If the two amplitudes are equal and the phase difference is π/2, the resultant motion will be

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):If we heat a substance, then its mass increases.
Reason(R):Heat-energy is given to the mass.

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): Sum of the mass moment is zero, if centre of mass is at origin.
Reason(R): Position of centre of mass is given by 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): A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy stored becomes K times.
Reason(R): The surface density of charge on the plates remains constant or unchanged.

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): It is easier to start a car engine on a warm day than cold day.
Reason(R): Internal energy of the engine is high on a warm day than a cold day .

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): Ohm's law is applicable to insulators.
Reason(R): For insulators resistance decreases with rise in temperature.

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): The force of friction in the case of a disc rolling without slipping down an inclined plane is zero.
Reason(R): When the disc rolls without slipping, friction is required because for rolling condition velocity of point of contact is zero.

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): When a bullet is fired from a gun, the gun gives a large velocity to the bullet in the forward direction and an equivalent velocity of recede is given by the bullet to the gun.
Reason(R): Whenever there is change in momentum of one body, the same change occurs in the momentum of the second body in the opposite direction.

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): P-T graphs of all gases at low density meet at only one point called absolute zero.
Reason(R): Absolute zero is less than 0ºC in a celsius scale.

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): In a parallel combination of capacitors potential difference across all the capacitors is same.
Reason(R): In a parallel combination, the equivalent capacitance is always less than any individual capacitance.

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): The sum and difference of two vectors will be equal in magnitude, when the two vectors are perpendicular to each other.
Reason(R): Either of the two vectors is a null vector.

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): In a nuclear reactor cadmium acts as a moderator.
Reason(R): The cadium rods are so inserted in the graphite block so that they can be slided in and out as per requirement.

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): All processes in which pressure and volume are proportional, take place at constant temperature.
Reason(R): Work done in a thermodynamical process is path dependent.

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): A red object appears dark in yellow light.
Reason(R): The red colour is scattered less.

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): Torque is an axial vector and directed along the axis of rotation.
Reason(R): Torque is equal to vector product of force to the position vector.

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): Heavy water is a suitable moderator in a nuclear-reactor.
Reason(R): Nuclear mass is greater than the mass of neutron.

Solution:

As a result of fission of uranium in the reactor, fast-moving neutrons are produced.
These neutrons must be slowed down if the chain-reaction is to be maintained. For this, they are collided with some moderator
The moderator will be effective in slowing down the neutrons only when its nuclear mass is of the order of the mass of neutron
If nucleus is too heavy, then the neutron, after collision with it, will return back with the same speed. If the nucleus is too light, then the neutron will move forward with almost the same speed.
The mass of heavy water nucleus is of the order of the mass of neutron.
Hence heavy water nuclei slow down the speed of the neutrons

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): Out of galvanometer, ammeter and voltmeter resistance of ammeter is lowest and resistance of voltmeter is highest.
Reason(R): An ammeter is connected in series and a voltmeter is connected in parallel in a circuit.

Solution:
QUESTION: 43

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): In a non-uniform circular motion tangential acceleration arises due to change in magnitude of velocity.
Reason(R): In a non-uniform circular motion centripetal acceleration produce due to change in direction of velocity.

Solution:
QUESTION: 44

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 open organ pipes of same length produce sounds of different frequencies if their diameters are different .
Reason(R): Open pipe produces both even and odd harmonics.

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): If bodies slide down an inclined plane without rolling then all bodies reach the bottom simultaneously.
Reason(R): Acceleration of all bodies are equal and independent of the shape.

Solution:
QUESTION: 46

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: 47

A body is projected at such an angle that the horizontal range is three times the greatest height. The angle of projection is

Solution:
QUESTION: 48

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The nature of image is

Solution:
QUESTION: 49

The refractive index of a certain glass is 1.5, for a light of wavelength 6000 Å . When light (c = 3 x 108 ms−1)  passed through this glass, its wavelength is

Solution:
QUESTION: 50

The wavelength of light diminishes 'μ' times in a medium. A diver from inside water (μ=1.33) looks at an object whose natural colour is green. He sees the object as

Solution:
QUESTION: 51

The valency of an impurity added to germanium crystal in order to convert it into a P-type semi-conductor is

Solution:
QUESTION: 52

In P-type semiconductor, there is

Solution:
QUESTION: 53

A constant voltage is applied on a uniform wire, then the heat is produced. The heat so produced will be doubled, if

Solution:
QUESTION: 54

The physical quantity that has no dimensions

Solution:
QUESTION: 55

Dimensions of 1/μ₀ε₀, where symbols have their usual meaning, are

Solution:
QUESTION: 56

When distance between source of light and observer decreases, then the apparent frequency of light

Solution:
QUESTION: 57

A wave front is the locus of all the particles of a medium, which are vibrating in the

Solution:
QUESTION: 58

The golden view of sea shell is due to

Solution:
QUESTION: 59

A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

Solution:

Work done by the centripetal force is zero

QUESTION: 60

The number of numbers less than and prime to 1024 is

Solution:
QUESTION: 61

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 current carrying wire produces electric field.
Reason(R): The current in a wire is due to the flow of free electrons in a definite direction.

Solution:
QUESTION: 62

Mild oxidation of glycerol with H₂O₂/FeSO₄ gives

Solution:
QUESTION: 63

Assume that the nucleus of the fluorine atom is a sphere of radius 5 x 10-13 cm. What is the density of matter in the nucleus?

Solution:

The radius of a fluorine nucleus is x 10-13 cm
The mass of a F nucleus = 19/6 x 1023 g = 3.2 x 10-26 kg
The volume of a F nucles     QUESTION: 64

1 mol of CH₄ contains

Solution:
QUESTION: 65

Which of the following is most reactive towards electrophilic substitution ?

Solution:
QUESTION: 66

The treatment of benzene with iso-butene in the presence of sulphuric acid gives

Solution:
QUESTION: 67

A compound that easily undergoes bromination is

Solution:
QUESTION: 68

Freon is used as a

Solution:
QUESTION: 69

The compound used as refrigerant is

Solution:
QUESTION: 70

Which of the following is planar?

Solution:
QUESTION: 71

For the first order reaction with rate constant k, which expression gives the half-life period? (Initial conc. = a)

Solution:
QUESTION: 72

The process of osmosis was first discovered by

Solution:
QUESTION: 73

If a gas at constant temperature and pressure expands, then its

Solution:
QUESTION: 74

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): ∆H of a reaction is independent of temperature.
Reason(R):∆Hº of a reaction = ∑Hº (Products)-∑Hº(Reactants).

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): Orlon cannot be used as synthetic fibre.
Reason(R): The monomer of orlon is vinyl chloride.

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):A nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules.
Reason(R):In ice each water molecule forms four hydrogen bonds as each molecule is fixed in the space.

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): Tendency of non-metalsto form ionic bond increases along teh period but decreases down down the group.
Reason(R): electron affinity increases along the period but decreases down the group.

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): Fe3+ion compounds are more stable than Fe2+ ion compounds.
Reason(R): Fe2+ ions are easily oxidised or Fe3+ ions.

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): In Ch3CH2CH2Cl; + I inductive effect in present.
Reason(R): Chlorine is more electronegative than carbon.

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):Carbonate cannot be detected by lime water test if mixture contains sulphite.
Reason(R):Sulphite dissolves calcium carbonate.

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): H₂O₂ can reduce Cl₂ to HCl.
Reason(R): H₂O₂ is also called antichlor.

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): Ionisation energy of F is numerically same to that of its electron affinity but with different sign .
Reason(R): Ionisation energy and electron affinity both depend upon size and effective nuclear charge.

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): PbS is roasted in air and when it is partially converted into oxide, it is further heated in absence of air.
Reason(R): Excess air can form higher oxides.

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): The probability of finding 4s-electron very close to nucleus is not zero.
Reason(R):4s electron density can penetrate into the inner shell electron density.

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): The overall reactivity of acid derivative follows the order:
Acetyl Chloride > Acid Anhyaride > Acid ester > Acid Amide.
Reason(R): Reactivity order as per the basicity order of leaving group Cl- > RCOO- > RO - > NH2-.

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): Oxidation of amino-naphthalene yields phthalic acid.
Reason(R): An amino group attached to the benzene ring renders it sensitive to oxidation.

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): PCl5 is covalent in gaseous and liquid state but ionic in solid state.
Reason(R): The solid state of PCl5 consists of tetrahedral cation and octahedral anion.

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): Potassium and cesium are used in photoelectric cells.
Reason(R): They emit electron on exposure to light.

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): Salts of ClO3- and ClO4- are well-known , but those of FO3- and FO4- are non-existent.
Reason(R): F is more electronegative than O, while Cl is less electro-negative than O.

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): Benzaldehyde with HCN gives two isomeric compounds.
Reason(R): Both nitrile and isonitrile compounds are possible when HCN reacts with carbonyl group.

Solution:
QUESTION: 91

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): Absorption spectrum is always discontinuous.
Reason (R): Light from source is first passed through a chemical solution and then analysed.

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): Magnetic moment values of actinides are lesser than the theoretically predicted values.
Reason(R): Actinide elements are strongly paramagnetic.

Solution:
QUESTION: 93

In a solution of CuSO₄ how much time will be required to precipiate 2g copper by 0.5 ampere current?

Solution:
QUESTION: 94

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): Potassium is not obtained by the electrolysis of fused KCl.
Reason(R): Potassium vaporises at the melting point of KCl.

Solution:
QUESTION: 95

The standard emf of the cell Zn + Cu2⁺ → Cu + Zn2 is 1.10 V at 25ºC. The emf of the cell when 0.1 M Cu2⁺ and 0.1 M Zn2⁺ solutions are used will be

Solution:
QUESTION: 96

In the gas equation PV = nRT, which of the following is correct?

Solution:
QUESTION: 97

Main process for the manufacture of sodium carbonate is

Solution:
QUESTION: 98

Which one of these is most reactive?

Solution:
QUESTION: 99

Bleaching action of bleaching powder is due to the liberation of

Solution:
QUESTION: 100

Which of the following reacts with water at a high rate?

Solution:
QUESTION: 101

Unlike other halogens, fluorine does not show higher oxidation states because

Solution:
QUESTION: 102

The H-O-H bond angle in H₂O molecule is

Solution:
QUESTION: 103

A mixture of a weak acid (say acetic acid) and its salt with a strong base (say sodium acetate) is a buffer solution. Which other pair of substances from the following may have a similar property ?

Solution:
QUESTION: 104

Which of the following is a mixed ketone?

Solution:
QUESTION: 105

A base dissolved in water, yields a solution with a hydroxyl ion concentration of 0.05 mol-L⁻1. The solution is

Solution:
QUESTION: 106

In which of the following, the solubility of AgCl will be maximum ?

Solution:
QUESTION: 107

Which one is not an acid salt ?

Solution:
QUESTION: 108

Acetone on heating with conc. H₂SO₄ mainly gives

Solution:
QUESTION: 109

Which is not the resonance structure of aniline?

Solution:
QUESTION: 110

Conc.HNO3 forms inpresence of:

Solution:
QUESTION: 111

Quartz is a crystalline variety of

Solution:
QUESTION: 112

Which of the following is the example of S N 2 reaction?

Solution:
QUESTION: 113

Most stable alkene is :

Solution:
QUESTION: 114

Which of the following glass is used in making wind screen of automobiles?

Solution:
QUESTION: 115

A solid AB has NaCl type structure. If radius of the cation A is 100 pm, then radius of the anion is

Solution:
QUESTION: 116

Which is heaviest ?

Solution:
QUESTION: 117

Vapour pressure of CCl₄ at 25ºC is 143 mm Hg. 0.5 gm of a non volatile solute (mol weight 65) is dissolved in 100 ml CCl₄. Find the vapour pressure of the solution. (Density of CCl₄ = 1.58g/cm3)

Solution:
QUESTION: 118

Chiral molecules are those which are :

Solution:
QUESTION: 119

10 ml of conc. H₂SO₄ (10 molar) is diluted to 1 litre. The approximate strength of dilute acid could be

Solution:
QUESTION: 120

loss of electron is termed

Solution:
QUESTION: 121

Which of the following alloys contains Cu and Zn?

Solution:
QUESTION: 122

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): Cellular endosperm os formed by both nuclear division and wall formation.
Reason (R): It lacks haustoria.

Solution:
QUESTION: 123

The largest and the most powerful adductor muscle in flying bird is the:

Solution:
QUESTION: 124

Schwann cells and node of ranvier are found in

Solution:
QUESTION: 125

Which one of the following sets of insects includes vectors of human diseases only?

Solution:
QUESTION: 126

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): If the main trunk of Banyan tree is removed it is capable to survive.
Reason (R): Prop roots support the tree.

Solution:
QUESTION: 127

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): Samara is a winged achenial fruit.
Reason (R): Wings may or may not develop from its pericarp.

Solution:
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): Bees often pollinate red flower.
Reason (R): Bees depend on flowers for water only.

Solution:
QUESTION: 129

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): A person who has received a cut and is bleeding needs to be given anti-tetanus treatment.
Reason(R): Anti-tetanus injection provides immunity by producing anitbodies for tetanus.

Solution:

Tetanus is a serious and often fatal disease caused by the neurotoxin tetanospasmin which is produced by the gram positive obligate anaerobic bacterium Clostridium tetani.Ifection begins when the bacteria are introduced into an open injury or wound where they produce tetanospasmin toxin which blocks messages from the spinal cord to the muscles, forcing muscles to go into severe spasm.Therefore a person who has received a cut and is bleeding needs to be given antitetanus treatment.
Antitetanus immunoglobin gives passive immunity. Tetanus is best prevented by active immunization with tetanus toxoid which stimulates the production of protective antitoxin.

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): There is no chance of transmission of malaria to man on the bite of a male Anopheles mosquito.
Reason(R): It carries a non-virulent strain of Plasmodium.

Solution:

There is no chance of transmission of malaria to man on the bite of a male Anopheles mosquito. The mouthparts of male mosquito is organised in such a manner that they can not suck the human blood. They feed mainly on the leaf and fruit juices.

QUESTION: 131

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): In C3 plants, photosynthesis is reduced on high temperature.
Reason (R): C4 plants have high photosynthesis of high temperature.

Solution:
QUESTION: 132

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): Food web consists of several food chains.
Reason (R): Food web decreases the stability of an ecosystem.

Solution:
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): Monocot stem consists of collateral open vascular bundles.
Reason(R): If cambium is absent such vascular bundles are called closed type.

Solution:

Monocot stem possess collateral CLOSED vascular bundle. If cambium is present in vascular bundles of dicot is called open bundles.

QUESTION: 134

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): Lysosomes show stability in the living cell.
Reason (R): Lysosomal membrane is not digested by the lysosomal enzymes

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): A plant girdled upto bast will die.
Reason(R): Water transportation will cease.

Solution:

A plant girdled upto bast will eventually die because the girdled region has only xylem and no phloem(bast).Translocation of food to roots does not occur and therefore, roots die which in turn affects the absorption of water.
Water transportation will cease if the xylem portion is girdled.

QUESTION: 136

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): Conifer trees produce a large quantity of wind borne pollen grains.
Reason(R): The pollen grains have wings.

Solution:

Conifers (e.g.,Pinus) are heterosporous plants producing mega and microspores inside megasporangium and micro-sporangium respectively.
Each micro-sporangium is a small, sessile and elongated sac like structure having two layered wall. Inside the wall lie tapetum which is a nourishing layer. Inside the cavity are large number of dusty and two winged micro-spores present. On maturity the microsporangium wall bursts from the upper side forming a longitudinal slit. A large number of yellow pollen grains are liberated which are carried by wind due to the presence of wings.

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): In cells engaged in active secretion, as in pancreas, the rough endoplasmic reticulum is well developed.
Reason(R): Ribosomes attached to endoplasmic reticulum are actively engaged in protein synthesis.

Solution:

Rough endoplasmic reticulum possess rough membrane due to presence of a number of ribosomes attached to their outer surfaces.Therefore RER is also called granular endoplasmic reticulum. The membrane of the endoplasmic reticulum bears a fine pore in the area of attached ribosome which passes the synthesised polypeptide into the channel of endoplasmic reticulum for transport. RER contains two types of glycoproteins (ribophorin I and ribophorin II) for attachment to ribosomes. The rough ER is engaged in synthesising proteins and enzymes, due to the presence of of ribosomes. It is, rich in cells which are actively engaged in protein synthesis and secretory activity, e.g., pancreatic acinus cells, plasma cells, fibroblasts, goblet cells.

QUESTION: 138

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): Water absorption is reduced by lowering O2 tension.
Reason (R): The accumulation of CO2 reduces water absorption.

Solution:
QUESTION: 139

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): Algae and fungi are classified as thallophytes.
Reason(R): They both are autotrophs.

Solution:

Eicher classified plant kingdom into two subdivivsions-Cryptogamae and Phanerogamae. Cryptogamae is again divided into 3 divisions thallophyta, bryophyta and pteridophyta. Thallophyta is divided into 2 classes, algae and fungi. They are called thallophyta because they have thallus likeplant body, which is not differentiated into true root, stem and leave, and they are non vascular plants. Algae are chlorophyllous and hence show autotrophic mode of nutrition i.e. they can prepare their own food. But fungi are non-chlorophyllous and cannot prepare their own food. So they are heterophic in nature.

QUESTION: 140

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): Relationship between sea anemone and hermit crab is said to be an example of obligate mutualism.
Reason (R): Obligate mutualism is a positive (beneficial) interaction between two species.

Solution:
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): In tropical rain forests, O-horizon and A-horizon of soil profile are shallow and nutrientpoor.
Reason(R): Excessive growth of micro-organisms in the soil depletes its organic content.

Solution:

A cross section of well developed soil shows more or less distinct layers called horizons. O-horizon is the topmost layer of soil and A-horizon comes below O horizon. In the topmost layer, vegetation grows and various biological activities takes place. Tropical rain forests are found in tropical zone of the world and are characterized by very high temperature and abundance of rainfall. Soil in these area are erd latosols and are exceedingly thick. Leaching of minearls from the top soil occurs rapidly buut cycling of nutrients also occur here. The laterite soils are generally infertile because of intensive leaching and not due to growth of micro organisms.

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): Leguminous plants are best preferred for rotation of crops.
Reason(R): They have root nodules which have nitrogen fixing bacterium Clostridium.

Solution:

Usually non-leguminous crops like wheat, rice, millets etc. are rotated with leguminous crops gram , pea, pulses, beans, groundnut, alfalfa, clover, etc. Leguminous plants bear nodulated roots. The root nodules contain nitrogen fixing bacteria of the genus Rhizobium. The bacteria convert molecular nitrogen into salts of nitrogen. The later enrich the leguminous crop as well as soil. Therefore, crop rotation maintains the nitrogen fertility of the soil when legume crop is rotated with others.

QUESTION: 143

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): Use of fertilizers greatly enhances crop productivity.
Reason(R): Irrigation is very important in increasing crop productivity.

Solution:

The direct application of fertilizers to crop or soils is a simple route to increase crop yield.Average yield per hectare has increased from 1.1 tons in 1950 to 2.3 tons in 1986 by the use of inorganic fertilizers.
Irrigation is very important in increasing crop productivity as water is an essential component of vital activities of a plant.

QUESTION: 144

DNA strands are antiparallel because of the presence of :

Solution:
QUESTION: 145

On hydrolysis of cane sugar we can obtain

Solution:
QUESTION: 146

Which of the following best describes a vein?

Solution:
QUESTION: 147

A 5-carbon compound of kreb's cycle is a key compound in nitrogen metabolism. It is

Solution:
QUESTION: 148

Succus entericus is the name given to

Solution:
QUESTION: 149

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): Generally, a woman does not conceive during the lactation period.
Reason(R): The hormone 'prolactin' initiates and maintains lactation in a postpartum woman.

Solution:

Generally a woman does not conceive during the lactation period. LActation stimulates prolactin secretion and there is evidence that prolactin inhibits GnRH secretion and antagonizes the action of gonadotropins on the ovaries. Ovulation is inhibited and the ovaries are inactive so estrogen and progestrone output falls to low levels.Only 5 to 10 % chances of getting pregnant are there during lactation period.
Prolactin is a protein hormone of the adenohypophysis of the pituitary gland that induces and maintains lactation in the postpartum mammalian female .

QUESTION: 150

The family homonidae includes a single genus

Solution:
QUESTION: 151

IPM (Intergrated Pest Management) involves

Solution:
QUESTION: 152

Reserpine, a drug, is extracted from

Solution:
QUESTION: 153

Information from DNA is conveyed by

Solution:
QUESTION: 154

Who made discovery for genetic engineering ?

Solution:
QUESTION: 155

Sugar is extracted from sugarcane and also from the crops of

Solution:
QUESTION: 156

An externally observable characters of an individual are called

Solution:
QUESTION: 157

AIDS spreads due to

Solution:
QUESTION: 158

Confirmatory test for AIDS is

Solution:
QUESTION: 159

A human male has one one barr body in his somatic cell nuclei. The chromosome constitution must be

Solution:
QUESTION: 160

A person with antigen 'B' in RBC and antibodies 'a' in the plasma belongs to the blood group

Solution:
QUESTION: 161

A person stung with bee is administered penicillin. The person dies. Death may be due to

Solution:
QUESTION: 162

*Genes are packed in bacterial chromosome by

Solution:
QUESTION: 163

A free living aerobic and nonphotosynthetic nitrogen fixing bacterium is

Solution:
QUESTION: 164

Verticillaster inflorescence occurs in

Solution:
QUESTION: 165

Which of the following would increase the heart rate?

Solution:
QUESTION: 166

Warburg effect is decrease in the rate of photosynthesis at

Solution:
QUESTION: 167

Photosynthetically active radiation represent the range of wavelength

Solution:
QUESTION: 168

Which one is polymerised to yield proteins ?

Solution:
QUESTION: 169

Bordered pits are found in

Solution:
QUESTION: 170

Result of ozone hole is

Solution:
QUESTION: 171

Which of these can preserve food stuffs?