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AIIMS Full Mock Test - 11

200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test - 11

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This mock test of AIIMS Full Mock Test - 11 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test - 11 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test - 11 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test - 11 exercise for a better result in the exam. You can find other AIIMS Full Mock Test - 11 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

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

Solution:

We know, mα = 2mp

QUESTION: 4

A fuse wire of 5 A can withstand a maximum power of 1 W in the circuit. Resistance of the fuse wire is

Solution:
QUESTION: 5

To obtain 3 μF capacity from three capacitors of 2 μF each, they will be arranged

Solution:
QUESTION: 6

The relation F = Ma, can not be deduced from Newton's second law if

Solution:
QUESTION: 7

The mass of a particle is 400 times than that of an electron and the charge is double. The particle is accelerated by 5 V. Initially the particle remained in rest, then its final kinetic energy will be

Solution:
QUESTION: 8

The energy of a photon of light with wavelength 5000Å is approximately 2.5eV. This way the energy of an X-ray photon with wavelength 1Å would be

Solution:
QUESTION: 9

If we consider electrons and photons of the same wavelength, then they will have the same

Solution:
QUESTION: 10

Choke coil works on the principle of

Solution:
QUESTION: 11

Eddy currents are produced when

Solution:

Eddy currents are produced when a metal is kept in a varying magnetic field.

QUESTION: 12

What is self inductance of a which produces 5V, when current in it changes from 3A to 2A in one millisecond ?

Solution:
QUESTION: 13

Which one of the following electromagnetic radiations have the smallest wavelength?

Solution:
QUESTION: 14

What is the value of inductance L for which the current is a maximum in series LCR circuit with C = 10 μF and ω = 1000 s − 1 ?

Solution:
QUESTION: 15

A quatity X is given by ε0 L ΔV /Δt , where ε0 is the permittivity of free space, L is a length, ΔV is potential difference and Δt is the time interval. The dimensional formula for X is the same as that of

Solution:

L] = [capacitance] = [C]
= current

QUESTION: 16

A capacitor of capacity 10 μF is charged to 40V and a second capacitor of capacity 15 μF is charged to 30V. If they are connected in parallel the amount of charge that flows from the smaller capacitor to higher capacitor in μC is

Solution:

Amount of charge flowing = 10 x 40 - 10 x 34 = 60

QUESTION: 17

If the K.E of a particle is doubled, then its momentum will

Solution:
QUESTION: 18

The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if

Solution:

Rate of loss of heat will depend on the surface area
So, when volume is same, the surface area will also be same

QUESTION: 19

If the kinetic energy of a body is increased by 300%, its momentum will increased by

Solution:
QUESTION: 20

There are two bulbs A and B. Bulb A has power 300 W and operating at 220 V. Bulb B has power 500 W and operating at same voltage. Then ratio of resistance offered by A and B will be

Solution:
QUESTION: 21

A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40º. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30º with the magnetic meridian. In this position, the needle will dip by an angle

Solution:
QUESTION: 22

A superconductor exihibits perfect

Solution:
QUESTION: 23

Which of the following affets the elasticity of a substance?

Solution:
QUESTION: 24

A man is standing on a balance and his weight is measured. If he takes a step in the left side. then weight

Solution:
QUESTION: 25

A radioactive sample has half life of 1500 years. A sealed tube containing 1 g of a sample will be containing ........... of the sample after 3000 years. The missing figure is

Solution:
QUESTION: 26

A body is executing S.H.M. when its displacement from the mean position is 4 cm and 5 cm, the corresponding velocity of the body is 10 cm/sec and 8 cm/sec. Then the time period of the body is

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): 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: 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): Virtual images are always erect.
Reason (R): Virtual images are formed by diverging lenses only.

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): For refraction in a plane surface can be used for the light moving from μ1 to μ2.
Reason(R): for light getting into a medium of index μ2 from μ1.

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): An electron moving antiparallel to the field experiences maximum force.
Reason(R): F → = q v → x B → (symbols have their usual meaning).

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): An electronic charge e is revolving in a circular orbit of radius r around a nucleus with speed v. The equivalent current is e 2πr
Reason(R): Charge = Current x Time.

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): 5 x 1026 photon (λ = 663 nm) must strike a totally refelcting screen per second , at normal incidence so that force exerted is 2 Newton .
Reason(R): Force on screen = total change in momentum of photons.

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): Direct vision spectroscope works on the principle of dispersion without deviation.
Reason(R): Crown and flint glass prisms are used to produce the effect of dispersion.

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): A dimensionless quantity may have unit
Reason (R): All unitless quantities are dimensionless

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): An object of mass m is initially at rest. A constant force F acts on it. Then the velocity gained by the object in a fixed displacement is proportional to 1 m .
Reason(R): For a given force and displacement, velocity is always inversely proportional to root of mass.

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): A force is required to put a stationary body in motion or stop a moving body and some external agency is needed to provide this force. The external agency may or may not be in contact with the body.
Reason(R): The external agency can provide force on a body even from a distance.

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 one of the prongs of a fork is broken, there will be only a forced vibration.
Reason(R): On breaking of a prong, it will only be a rod and so a particular frequency of vibration will not be available unless an external agency continues to vibrate.

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): Diatonic scales have eight notes covering double octave.
Reason(R): Mach number is used to express the speed of objects in relation to the speed of sound.

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): Moment of inertia depends on the distribution of mass
Reason(R): Moment of inertia is a scalar quantity.

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): Sound waves are not electromagretic waves.
Reason(R): Sound cannot travel in vacuum.

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): Surface area of a drop of liquid reduces to reduce energy.
Reason(R): Molecules on the surface of a drop have more energy than the molecules in the interior.

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): Pegs are fixed in stringed musical instruments like sitar, violen etc.
Reason(R): By rotating the pegs, the tension in the strings can be kept constant.

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): A larger dry cell has higher emf.
Reason(R): The emf of a dry cell is proportional to its size.

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 similarly charged bodies may attract each other.
Reason(R): When charge on one body (Q) is much greater than that on another (q) and they are close enough to each other then force of attraction between Q and induced charges exceeds the force of repulsion between Q and q.

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): Moving charge particle traces a helical path in a uniform magnetic field provided axis of the helix is perpendicular to magnetic field.
Reason(R): If a moving charges particle enters perpendicularly into a region of magnetic field from outside, it does not complete circular path.

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 capacitance of a condenser increases when a dielectric medium is filled between its plate.
Reason(R): Potential difference between the plates of capacitor is reduced by dielectric medium.

Solution:
QUESTION: 47

A motor boat is travelling with a speed of 3.0 m/sec. If the force on it due to a water flow is 500 N, the power of the boat is

Solution:
QUESTION: 48

A body of mass 0.5 kg is projected under gravity with a speed of 98 m/s at an angle of 30º with the horizontal. The change in momentum (in magnitude) of the body is

Solution:
QUESTION: 49

Ray optics is valid, when size of the object is

Solution:
QUESTION: 50

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is 4D, the power of a cut lens will be

Solution:
QUESTION: 51

For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?

Solution:
QUESTION: 52

When the temperature of silicon sample is increased from 27ºC to 100ºC, the conductivity of silicon will be

Solution:
QUESTION: 53

The voltage across a diode is increased in small steps and the current passing through it recorded at each step. The current

Solution:
QUESTION: 54

Two identical wires of resistance R are first connected in series and then in parallel. The amount of heat produced in both the conditions are in the ratio of

Solution:

QUESTION: 55

For the equation F ∝ Aa Vb Dc , where F is the force, A is the area, V is the velocity and D is the density, the dimensional formula gives the following values

Solution:
QUESTION: 56

Dimensions of coefficient of viscosity are

Solution:
QUESTION: 57

In Young's double slit interference experiment the wavelength of light used is 6000 Å. If the path difference between waves reaching a point P on the screen is 1.5 microns, then at that point P

Solution:
QUESTION: 58

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

Solution:
QUESTION: 59

Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2 m from the slits?

Solution:
QUESTION: 60

A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is

Solution:
QUESTION: 61

Methanol is manufactured by passing compressed water gas with excess of hydrogen over

Solution:
QUESTION: 62

The most stable carbonium ion is:

Solution:
QUESTION: 63

A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group towards o- and p-positions is

Solution:
QUESTION: 64

The homolytic fission of a hydrocarbon results in the formation of

Solution:
QUESTION: 65

The order of activity of the various o- and p-director is

Solution:
QUESTION: 66

The most reactive compound for electrophilic nitration is

Solution:
QUESTION: 67

Which of the following shows electrical conduction?

Solution:
QUESTION: 68

Freon is used as a

Solution:
QUESTION: 69

In piperidine,

The hybrid state assumed by nitrogen is

Solution:
QUESTION: 70

The rate of reaction, A + B → products; is given by the equation, r = k [A] [B]. If B is taken in large excess, the order of the reaction would be

Solution:
QUESTION: 71

When water is added to quick lime, the reaction is

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): HCl is a stronger acid these HI.
Reason(R):Bond energy of H-I is smaller than that of H-Cl.

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): Racemisation is a process by which optically active substance is converted into racemate form.
Reason(R): A pair of diastereoisomers have identical configuration at one chiral carbon, but mirror image configuration at the second chiral carbon.

Solution:
QUESTION: 74

For a reaction A + B → C + D, if concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of reacton is

Solution:

r = k [A]α [B]β .... (i)
2r = k [2.A]α [B]β . . . (ii)
3r = k [A]α [9B]β . . . (iii)
Dividing eqn. (ii) by eqn. (i), we get 2 = 2α or α = 1
Dividing eqn. (iii) by eqn. (i), we get
3 = 9β or 3 = 3 or 2β = 1 or β = 1/2.
∴ order og reaction

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): Heat of neutralisation of nitric acid with NaOH is same to that of HCl and NaOH.
Reason(R): In both cases strong acid and strong bases are neutralised with basic reaction : H+ + OH- → H2O.

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): In titration of strong acid and strong base, we can use phenol-phthalein as indicator.
Reason(R): At the end point pH of solution is in between 8-10.

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): Para-hydrogen has lower internal energy and is favoured at high temperature.
Reason(R): The thermal conductivity of para-hydrogen is lesser than that of ortho-hydrogen.

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): In rock salt structure all the octahedral voids in the close packing of an-ions are occupied by cations.
Reason(R): In rock salt structure, the distance of closest approach between two anions is equal to half the face diagonal of the unit cell.

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): Nitrophenol is stronger acid than phenol.
Reason(R): Nitro group is electron withdrawing group and hence stabilises the anion formed.

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): Phenoxide ion (C6H5- O ⊖) is more reactive than phenol towards electrophiles.
Reason(R): Phenoxide ion is more stable than phenol.

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): Physical absorption of molecules take place on surface only.
Reason(R): In this process, the bonds of the absorbed molecules are broken.

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):White colour mixture is an indication of transition metal salts being absent with few exceptions (Fe2+, Mn2+ etc.).
Reason(R):Most of transition metals salts are coloured.

Solution:

White or near white mixtures normally do not contain transition metal cations in them.
Fe2+ is faintly green, Mn2+ is faintly pink and Zn2+ is white

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): Transition metals form a large number of interstitial compounds.
Reason(R): They have high melting point and boiling point.

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): Chloroform and benezene are miscible liquids and they are separated by fractional distillation.
Reason(R): Boiling point of benzene is less than that of chloroform .

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): Molecular weight of CO2 is 44 and its vapour density is 22.
Reason(R): Mol.wt. = 2 x V.D.

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): Transition metals form stable complexes.
Reason(R): Transition metals have unpaired electrons.

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): When a liquid undergoes evaporation, the temperature of the liquid remains unchanged.
Reason(R): Kinetic energy of the molecules is directly proportional to absolute temperature.

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): Tert. Butyl alcohol undergoes acid catalysed dehydration readily than propanol.
Reason(R): Tertiary alcohols do not give Victor-Meyer's test.

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): Staggered form is less stable than the eclipsed form.
Reason(R): The conformation in which the bond pairs of two central atoms are very far from one another is called staggered form.

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): Maximum number of electrons in a shell can be 2n2.
Reason(R): Maximum number of electrons in a subshell can be 2,6,10,14 in s,p,d,f respectively.

Solution:
QUESTION: 91

The oxidation number of sulphur in Na₂S₄O₆ is

Solution:
QUESTION: 92

Conductivity (Unit:siemen's S) is directly proportionally to the area of the vessel and the concentration of the solution in it and is inversely proportional to the length of vessel,then the unit of constant of proportionally is

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): 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: 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): First four aliphatic monocarbocylic acids are colourless.
Reason(R): carboxylic acids with morethan five carbon atoms are insoluble in water.

Solution:
QUESTION: 95

At what temperature, the rate of diffusion of N₂ would be 1.625 times the rate of diffusion of SO₂ at 500ºC?

Solution:
QUESTION: 96

Which of the following does not liberate O₂ in Bunsen burner?

Solution:
QUESTION: 97

Oxone is

Solution:
QUESTION: 98

As the atomic number of halogens increases, the halogens

Solution:
QUESTION: 99

Strongest bond is in between

Solution:
QUESTION: 100

Which of the following is liberated when beryllium reacts with strong sulphuric acid?

Solution:
QUESTION: 101

Which alkene is formed from the following ylide carbonyl pair CH₃CH₂CH₂CH = PPh₃ + 2-Butanone

Solution:
QUESTION: 102

To a solution containing equimolar mixture of sodium acetate and acetic acid, some more amount of sodium acetate solution is added. The pH of mixture solution

Solution:
QUESTION: 103

Which of the following is correct about heavy water?

Solution:
QUESTION: 104

Aluminium chloride is

Solution:
QUESTION: 105

The pH indicates are

Solution:
QUESTION: 106

At 25ºC, the value of a solution is 6. The solution is

Solution:
QUESTION: 107

Which of the following statements regarding chemical properties of acetophenone are wrong?
I. It is reduced to methylphenylcarbinol by sodium and ethanol
II. It is oxidised to benzoic acid with acidified KMnO₄
III. It does not undergo electrophilic substitution like nitration at meta position
IV. It does not undergo iodoform reaction with iodine and alkali

Solution:
QUESTION: 108

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

Solution:
QUESTION: 109

Which gives more stable product ?

Solution:
QUESTION: 110

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

Solution:
QUESTION: 111

Which is not the resonance structure of aniline?

Solution:
QUESTION: 112

Most stable alkene is :

Solution:
QUESTION: 113

The number of gram equivalents present in 60 ml of 4 N solution is

Solution:
QUESTION: 114

Silicon combines with magnesium in an electric arc furnace between 2000K to 2500 k to produce

Solution:
QUESTION: 115

5.85 gram of NaCl (mol.wt.58.5) dissolved in water and solution made up to 500ml. Molarity of solution will be

Solution:
QUESTION: 116

Coordination number for Cu is

Solution:

Coordination number of ccp (cubic close packing) arrangement is 12
Copper (cu) has ccp structure hence coordination no is 12

QUESTION: 117

10.6 g of a substance of molecular weight 106 was dissolved in 100 ml; 10 ml of this solution was pipetted out into a 1000 ml flask and made upto the mark with distilled water. The molarity of the resulting solution is

Solution:
QUESTION: 118

Which of the following compounds can show optical isomerism?

Solution:
QUESTION: 119

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn blue ?

Solution:
QUESTION: 120

If 0.5g of metal on oxidation formed 0.79 g of its oxide, then equivalent weight of the metal is

Solution:
QUESTION: 121

The nerve transmitter, produced at the synapse and neuromuscular junction, is

Solution:
QUESTION: 122

Solution:
QUESTION: 123

Toes of Owl are adapted for

Solution:
QUESTION: 124

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: 125

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): Lipids present in the outer and inner side of the bilayer membrane are mostly same.
Reason (R): Oligosaccharides are attached to external surface as well as inner surface of biomembrane.

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): Sigmoid growth curve consists of four parts.
Reason (R): Lag phase is called as grand phase of growth.

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): Ethylene is a gaseous hormone.
Reason (R): Ethylene is formed in almost all plant parts.

Solution:
QUESTION: 128

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): UV radiation causes photodissociation of ozone into O2 and O, thus causing damage to the stratospheric ozone layer.
Reason(R): Ozone hole is resulting in global warming and climate change.

Solution:

Stratosphere zone of earth's atmosphere contains a layer of ozone (O3) which prevents the erath surface from about 99% of incoming solar ultra violet radiations.The primary chemicals responsible for ozone depletion are a group of chlorine containing compounds called chloroflourocarbons (CFCs) used as coolants in refrigeration and air conditioners and propellants for aerosol cans and foam blowing agents for insulation and packaging and also as solvents.After their release into troposphere CFCs go to stratosphere when these are broken down by ultraviolet radiations releasing chlorine or bromine which break O3 molecules into O2 and O.
Due to depletion of O3 layer, higher levels of ultra violet rays reach earth surface. Depletion in the concentration of ozone over a restricted area called ozone hole.Ozone depletions results in problems like skin cancer, cataract animals becoming blind, mutations, inhibiting photosynthesis, decreases in productivity. Decreased photosynthetic activity will increase O2 concentration of the atmosphere resulting in global warming.

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): Gram-negative bacteria do not retain the stain when washed with alcohol.
Reason(R): The outer face of the outer membrane of Gram-negative bacteria contains lipopolysaccharides, a part of which is integrated into the membrane lipids.

Solution:

The Gram staining technique was discovered by Christian Gram.The cell wall of gram+ve bacteria contains both horizontal and vertical peptide linkages due to which mesh is dense and stain does not come out.But the cell wall of gram-ve bacteria has either horizontal or vertical peptide linkages, due to which mesh is loose and hence stain comes out when washed with alcohol.

QUESTION: 130

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 embryo sac is 7-called, 7-nucleated structure.
Reason (R): All cells are haploid.

Solution:
QUESTION: 131

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): The atmospheric concentration of CO2 at which photosynthesis just compensates for respiration is referred to as CO2 compensation point.
Reason(R): The CO2 uptake is less than that generated through respiration because the level of CO2 in the atmosphere is more than the required for achieving CO2 compensation point.

Solution:

The atmospheric concentration of CO2 at which photosynthesis just compensates for respiration is referred to as the CO2 compensation point.
Photosynthesis is strogly limited by the low CO2 concentration while respiratory rates remain unaffected. As a result there is a negative balance between CO2 fixed by photosynthesis and CO2 by respiration and a net efflux of CO2 from the plant.

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): Interferons are a type of antibodies produced by body cells infected by bacteria.
Reason(R): Interferons stimulate inflammation at the site of injury.

Solution:

Interferons are not antibodies.These are defence proteins that are produced by body cells that are infected by a virus. They travel to nearby cells and prevent the spread of the virus.
Cells that have been infected produce chemical called histamine. This chemical causes the blood capillaries to dilate (get wider) and become more porous. As a result the area swells, gets red, becomes warm, and is painful. This results in more white blood cells coming to the area to fight the infection. If the inflammation happens over the whole body we get a fever. The fever is the body’s way to combat bacteria and viruses. The higher temperature inhibits the pathogen from reproducing.Interferons do not stimulate inflammation at the site of injury.

QUESTION: 133

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: 134

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): Thiamine deficiency results in beri-beri causing paralysis.
Reason(R): People eating raw fish may also suffer from paralysis due to the deficiency of vitamin B1. Cooked fish has no such effect.

Solution:

Thiamine deficiency results in Beri-beri disease causing paralysis.
Thiamine or vitamin B1 is an antineuritic vitamin. Beri-beri is characterized by loss of appetite and weight, retrded growth, degeneration of nerves and muscle atrophy, thus in acute cases leads to paralysis.
Raw freshwater fish and shellfish contain chemicals that destroy thiamine. Eating a lot of raw fish or shellfish can contribute to thiamine deficiency. But cooked fish and seafood are OK. They don't have any affect on thiamine, because cooking destroys the chemicals that harm thiamine.

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): Rhoeo leaves contain anthocyanin pigments in epidermal cells.
Reason(R): Anthocyanins are accessory photosynthetic pigments.

Solution:

Anthocyanin is a colouring pigment of certain higher plants that imparts a bluish or reddish colour.
Rhoeo leaves contain anthocyanin pigments in epidermal cells.

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): Red algae contribute in producing coral reefs.
Reason(R): Some red algae secrete and deposit calcium carbonate over their walls.

Solution:

Formation of Coral reefs is done by accumulation of calcareous exoskeletons of coral animals, calcareous red algae and molluscs. The foundation of reefs is formed by secretion of calcium carbonate skeleton.This foundation provides protection for the coral polyps.

QUESTION: 137

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): Corm is a highly condensed and specialised underground stem.
Reason (R): Corm has circular nodes.

Solution:
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): The endodermal cells of dicot root form casparian strip.
Reason (R): Endodermis functions as a biological check post.

Solution:
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): Exocrine glands are also known as ductless glands.
Reason (R): Thyroid gland directly pours its secretion, i.e., thyroxine, into the blood.

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): In angiosperms the conduction of water is more efficient because their xylem has vessels.
Reason(R): Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

Solution:

In angiosperms, vessels are composite structure as these are formed by dissolution of end walls of row of cells i.e., vessel elements. So angiosperms, have more efficient system of conduction due to presence of vessels. The xylem parenchyma are mainly for storage function but sometimes help in conduction.

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): 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: 142

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): Autogamy is pollination between two flowers on the same plant.
Reason (R): Xenogamy is pollination between two flowers on the different plant.

Solution:
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): Carotene is a type of carotenoid.
Reason (R): Carotene is a precursor of vitamin A.

Solution:
QUESTION: 144

The highest blood pressure in the aorta occurs when the

Solution:
QUESTION: 145

Correct sequence in electron acceptors in ATP synthesis is

Solution:
QUESTION: 146

The alkaline tide occurs when _____ is/are secreted into the blood.

Solution:
QUESTION: 147

Starch is a polymer of

Solution:
QUESTION: 148

Transfer of genetic information from one genration to the other is accomplished by :

Solution:
QUESTION: 149

Azadirachtin, a common constituent of mosquito repellant coils comes from

Solution:
QUESTION: 150

One of the following is a source of rubber

Solution:
QUESTION: 151

Cocaine is obtained from

Solution:
QUESTION: 152

During DNA replication, the strands of DNA are separated

Solution:
QUESTION: 153

The function of promoter of lac-operon is to

Solution:
QUESTION: 154

Solution:
QUESTION: 155

First geneticist/father of genetics was

Solution:
QUESTION: 156

XO chromosome abnormality is

Solution:
QUESTION: 157

Antibody is connected with

Solution:
QUESTION: 158

Universal recipient blood group is

Solution:
QUESTION: 159

Antibody formation and immunity production by globulin protein is found in

Solution:
QUESTION: 160

T-lymphocytes recognise

Solution:
QUESTION: 161

Antibiotics are

Solution:
QUESTION: 162

The inflorescence present in Euphorbia is

Solution:

The genus Euphorbia has inflorescence cyathia (sing. Cyathium) usually organised in umbels.

QUESTION: 163

Nitrogen fixing organism which can be symbiotic is

Solution:
QUESTION: 164

Chlorophyll molecules are green in colour, because they

Solution:
QUESTION: 165

Vermis is

Solution:
QUESTION: 166

Blackman's law was conceived in connection with

Solution:
QUESTION: 167

The technique of obtaining large number of plantlets through tissue culture is

Solution:
QUESTION: 168

Bordered pits occur in

Solution:
QUESTION: 169