AIIMS Full Mock Test - 7


200 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Full Mock Test - 7


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This mock test of AIIMS Full Mock Test - 7 for NEET helps you for every NEET entrance exam. This contains 200 Multiple Choice Questions for NEET AIIMS Full Mock Test - 7 (mcq) to study with solutions a complete question bank. The solved questions answers in this AIIMS Full Mock Test - 7 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AIIMS Full Mock Test - 7 exercise for a better result in the exam. You can find other AIIMS Full Mock Test - 7 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

The r.m.s. value of an a.c. of 50 Hz is 10A. The time taken by a.c. in reaching from zero to maximum value and the peak value of current will be

Solution:
QUESTION: 2

In photoeletric effect, the slope of the straight line graph between stopping potential and frequency of incident radiation gives the ratio of plank's constant to

Solution:
QUESTION: 3

A mass of 12Kg at rest explodes into two pieces of masses 4Kg and 8Kg which move in opposite directions. If the velocity of 8Kg piece is 6 ms-1, then the kinetic energy of the other piece in joules is
(Hint : Apply law of conservation of momentum)

Solution:
QUESTION: 4

The resistance of a discharge tube is

Solution:
QUESTION: 5

In Millikan oil drop experiment a drop of charge Q and radius r is kept constant between two plates of potential difference of 800 volt. Then charge on other drop of radius 2 r which is kept constant with a potential difference of 3200 V is

Solution:
QUESTION: 6

An electron and a proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

Solution:
QUESTION: 7

Consider the following statements concerning electrons :
(I) Electrons are universal constitutents of matter
(II) J.J. Thomson received the very first Nobel Prize in Physics for discovering the electron
(III) The mass of the electron is about 1/2000 of that of a neutron
(IV) According to Bohr the linear momentum of the electron is quantised in the hydrogen atom.

Which of the above statements are NOT correct ?

Solution:
QUESTION: 8

The given graph shows the variation of charge q versus potential difference for two capacitors C1 and C2. The two capacitors have same plate separation, but the plate area of C2 is double that of C1.

Solution:


As q = CV so, C = q/V and graph A has a larger slope than B,
So the graph A represents a capacitor of larger capacitance
Also, C = ℇ0A/d hence: C α A
As the plate area of C2 is double of that of C1,
So C2 has a larger capacitance
Hence the line A of the graph corresponds to C2

QUESTION: 9

The working of a dynamo is based on principle of

Solution:
QUESTION: 10

In purely inductive circuit, the relation of phase between current and voltage is

Solution:
QUESTION: 11

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: 12

An e.m.f. of 15 V is applied in a circuit coil containing 5 henry inductance and 10 ohm resistance. The ratio of currents at time t = ∞ and t = 1 second is

Solution:

Here, I = I0 at t = ∞. Let I be the current at t = 1s

QUESTION: 13

The waves which can not travel in vacuum are

Solution:
QUESTION: 14

Two electric charges of 9μC and − C are placed 0.16 m apart in air. There will be a point P at which electric potential is zero on the line joining the two charges and in between them. The distance of P from 9μC charge is

Solution:
QUESTION: 15

In Thomson's method of determing e/m of electrons

Solution:
QUESTION: 16

A unit charge is taken from one point to another over an equipotential surface. The work done in this process will be

Solution:
QUESTION: 17

Two masses of 1 gm and 4 gm are moving with equal kinetic energies. The ratio of the magnitudes of their linear momentum is

Solution:
QUESTION: 18

A light and a heavy body have equal kinetic energy. Which one has a greater momentum ?

Solution:
QUESTION: 19

The lengths and radii of two rods made of same material are in the ratios 1:2 and 2:3 respectively. If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio

Solution:
QUESTION: 20

An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Now its power is

Solution:
QUESTION: 21

The direction of magnetic line of force of a bar magnet is

Solution:
QUESTION: 22

The domain formation is a necessary feature of

Solution:
QUESTION: 23

Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. If Young's modulus of steel is twice that of copper, then ratio of elastic potential energies stored per unit volume in steel wire to that in copper wire is

Solution:
QUESTION: 24

The half-life of a radioactive isotope is three hours. If the initial mass of the isotope were 256 g,the mass of it remaining undecayed after 18 hours would be

Solution:
QUESTION: 25

A rectangular block of mass m and area of cross-section A floats in a liquid of density ρ. If it is given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then

Solution:
QUESTION: 26

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): Threshold wavelength of certain metal λ0. Light of wavelength is slightly less than λ0 is incident on the plate. It is found that after some time the emission of electron stops
Reason(R): The ejected electrons experience force of attraction due to development of positive charges on the plate, which after certain time is adequate enough to hold them to plate itself.

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 sunlight is focused on the slit, of a spectrometer, many dark lines are seen in the region of continuous spectrum .
Reason (R): A substance absorbs light of the same wavelength which it emits.

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): If the distance between the parallel plates of a capacitor is halved and dielectric constant is made three times, then capacitance becomes six times.
Reason(R): Capacitance of the capacitor does not depend on the geometry of the plates of the capacitor.

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): Neutrons can be accelerated by cyclotron.
Reason(R): Neutrons are too heavy.

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): Soft iron core is placed within the moving coild galvanometer .
Reason(R): Soft iron has low permeability .

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): A laser beam of 0.2 W can drill holes through a metal sheet whereas a 1000 W torch light cannot.
Reason (R): The frequency of laser is much higher than torch light.

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 bodies of mass 50g and 20g are allowed to fall from the same height. If air resistance for each is same, then both the bodies reach the earth simultaneously.
Reason(R): Acceleration of both the bodies is same.

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): Lighter and heavier bodies moving with same momenta and experiencing same retarding force have equal stopping times.
Reason(R): For a given force and momentum, stopping time is independent of mass.

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): Photon theory is also called the quantum theory of light.
Reason(R): Each photon has a definite energy but a variable linear momemtum.

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 mixed grouping of cells the current in the external circuit will be maximum when the internal resistance of the battery is equal to the external resistance .
Reason(R): In mixed grouping thetotal resistance is the sum of internal and external resistances .

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

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): Binding energy of a nucleus is the energy required to bind the nucleons together in the nucleus.
Reason(R): Binding energy is a measure of the stability of nucleus.

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): When a body moves vertically upwards, then work done by force of gravity is negative.
Reason(R): When a body moves upwards its kinetic energy decreases and potential energy increases.

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): Intensity of light from a point source of power 60 W depends inversely on the square of the distance.
Reason(R): Intensity varies with distance r as r-1 for a cylindrical source.

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): The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre.
Reason(R): If the solenoid is sufficiently long, the field within it is uniform.

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): 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: 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): If half of an isotope of lead is 26.8 minutes, then when this isotope of lead forms some compound by chemical combination, its half life is reduced.
Reason(R): Half life  

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): 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: 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): 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: 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): A particle of mass m collides with another stationary particle of mass M. If the particle m stops just after the collision, the coefficient of restitution of collisions is equal to 1.
Reason(R): Momentum of system just before and after the collision remains constant.

Solution:
QUESTION: 46

If a force is applied on a body and it moves with a velocity ν, the power will be

Solution:
QUESTION: 47

At the top of the trajectory of a projectile the acceleration is

Solution:
QUESTION: 48

The dark lines in the solar spectrum are due to

Solution:
QUESTION: 49

The critical angle for total internal reflection in diamond is 24.5º. The refractive index of the diamond is

Solution:
QUESTION: 50

A convex lens will become less convergent in

Solution:
QUESTION: 51

When a P-N junction diode is forward biased then

Solution:
QUESTION: 52

P-N junction diode can be used as

Solution:
QUESTION: 53

Two electric bulbs (60 W and 100 W respectively) are connected in series. The current passing through them is

Solution:
QUESTION: 54

The dimensions of a/b in the equation P = a-t2/bx, where P is pressure, x is distance and t is time, are

Solution:
QUESTION: 55

The sun is rotating about is own axis. The spectral lines emitted from the two ends of its equator, for an observer on the earth, will show

Solution:
QUESTION: 56

Using mass (M), length (L), time (T) and current (A) as fundamental quantities, the dimensions of permeability is

Solution:
QUESTION: 57

When a star moves away from earth, the spectrum of the star shifts towards higher wavelength side. This is due to

Solution:
QUESTION: 58

The phase difference between two waves reaching a point is π/2 . If the individual amplitudes are 3mm and 4mm, the resultant amplitude is

Solution:
QUESTION: 59

Yoe lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2m. In this process you take 5 seconds. The work done by you will depend upon

Solution:
QUESTION: 60

A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released. its centre of mass moves with what acceleration

Solution:
QUESTION: 61

Dehydration of glycerol gives

Solution:
QUESTION: 62

Which of the following is not a nucleophile?

Solution:
QUESTION: 63

The volume of 1.0 g of hydrogen in litres at N.T.P. is

Solution:
QUESTION: 64

If toluene is treated with chlorine in the presence of HCl then which of the following is formed?

Solution:
QUESTION: 65

Which of the following is formed when benzene is heated with concentrated sulphuric acid at 80ºC?

Solution:
QUESTION: 66

Necessary conditions for halogenation of benzene are

Solution:
QUESTION: 67

In graphite, the electrons are

Solution:
QUESTION: 68

which of the following shows electrical conduction?

Solution:
QUESTION: 69

Shape of ClO₃- is

Solution:
QUESTION: 70

Certain compound XY₂ decomposes as XY₂ → X + Y₂(g), at certain temperature. The evolution of Y₂ gas becomes two times faster when initial conc. of the compound is doubled. The reaction is of

Solution:
QUESTION: 71

If one mole of an ideal gas at 27ºC temperature is compressed reversibly from 20 litres to 10 litres, then work done during the process is (R = 8.314J-K⁻1-mol⁻1)

Solution:
QUESTION: 72

Which one of the following statements about the order of a reaction is true?

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): In polysaccharides , mono-saccharides units are linked to each other by glycoside linkage.
Reason(R): Glycoside linkage is an ether linkage .

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): The equilibrium constant for a reaction having positive ∆Hº increases with increase of temperature.
Reason(R): The temperature dependence of the equilibrium constant is related to ∆Sº and not ∆Hº for the reaction.

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): At the isoelectric point of an amino acid, it does not migrate under the influence of an electric field.
Reason(R): An amino acid at the isoelectric point exists as a Zwitter ion.

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): α-Hydrogen atoms in aldehydes and ketons are acidic.
Reason(R): Anions formed after loss of α-hydrogens are stabilised due to inductive effect.

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): Acetic acid does not undergo haloform reaction .
Reason(R): Acetic acid has no alpha hydrogens.

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): Conc. H2SO4 reacts with KCl to give Cl2 gas.
Reason(R): HCl cannot be oxidising by H2SO4.

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): The oxidation state of iron in brown coloured complex formed in ring test is +1.
Reason(R): The measured magnetic moment is 3.87 BM.

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): Zn and iron cannot decompose water to liberate hydrogen gas.
Reason(R): (Zn/Zn(2+)) and (Fe/Fe(2+)) are higher (H2/H+).

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): Sodium reacts with oxygen to form Na₂O₂ whereas potassium reacts with oxygen to form KO₂.
Reason(R): Potassium is more electro-positive than sodium.

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): Allyl and benzyl caronium ions are stable than popyl carbonium ions.
Reason(R): Electron releasing group stabilise carbonium ions.

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): S(N)1 mechanism is facilitated by polar protic solvents like water, alcohol etc.
Reason(R): C₆H₅CH(C₆H₅)−Br is less stable than C₆H₅CH(CH₃)Br in S(N)1 reactions.

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): Benzene does not undergo ozonolysis.
Reason(R): Benzene does not undergo addition reactions as alkenes and alkynes.

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): A colloidal solution of cellulose nitrate cannot be prepared directly.
Reason(R): Lyophilic sols can be prepared directly by mixing the substance with the dispersion medium.

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

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): KMnO4 is purple in colour due to charge transfer.
Reason(R): MnO4- ion is tetrahedral in shape.

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): 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: 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): Sodium metal cannot be obtained by the electrolysis of its salt in aqueous solution.
Reason(R): Sodium is above hydrogen in electro-chemical series and it reacts with water to produce sodium hydroxide and hydrogen.

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): Naphthalene is colourless while its isomer azulene is a blue compound.
Reason(R): ∆E, energy difference between the excited state and the ground state for nathalene is lower than that of azulene.

Solution:
QUESTION: 91

In the electrochemical cell Pt,  H2 (g)1atm / H+ (IM) / Cu2+ (IM) / Cu (s). Which one of the following statements is true?

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): 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: 93

The equivalent conductance of NaCl,HCl and C₂H₅COONa at infinite dilution are 126.45 , 426.16 and 91 ohm⁻1 cm2 eq-1. The eq.conductance of C₂H₅COOH is

Solution:
QUESTION: 94

The density of methane at 2 atm. pressure and 27ºC is

Solution:

The ideal gas equation :

PV = nRT

w = mass of methane
M = molar mass of methane = 16 g mol-1

QUESTION: 95

In the preparation of sodium carbonate (Na₂CO₃) which of the following is used?

Solution:
QUESTION: 96

Which of the following has the highest melting point?

Solution:
QUESTION: 97

The halogen that is most easily reduced is

Solution:
QUESTION: 98

Which of the following sets can be called isoelectronic species?

Solution:
QUESTION: 99

Which of the following compound of an alkaline earth metal is extremely hard?

Solution:
QUESTION: 100

A white salt is readily solubule in water and gives a colourless solution with a pH of about 9. The salt would be

Solution:
QUESTION: 101

The indicator used in the titration of sodium carbonate with sulphuric acid is

Solution:
QUESTION: 102

If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be

Solution:
QUESTION: 103

When 4 gm of NaOH is dissolved in ten litre of solution the pH is

Solution:
QUESTION: 104

Benzophenone can be converted into benzene using

Solution:
QUESTION: 105

In decinormal solution, CH₃COOH acid is ionised to the extent of 1.3%. If log 1.3 = 0.11. What is the pH of the solution?

Solution:
QUESTION: 106

From which of the following tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

Solution:
QUESTION: 107

Conc.HNO3 forms   in presence of:

Solution:
QUESTION: 108

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

Solution:
QUESTION: 109

In the following, electrophile is:
HO ― NO2

Solution:
QUESTION: 110

Carborundum is formed by the reaction of

Solution:
QUESTION: 111

Which gives more stable product ?

Solution:
QUESTION: 112

p-type silicon is formed by adding a minute amount of an element with

Solution:
QUESTION: 113

What is the strength of dibasic acid (Mol. wt. = 200) present in 100 ml of an aqueous solution? (Normality of solution = 0.1).

Solution:
QUESTION: 114

In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is

Solution:
QUESTION: 115

What weight of ferrous ammonium sulphate to prepare 100 ml 0.1 normal solution ? (mol.wt.392)

Solution:
QUESTION: 116

The normality of a solution of NaOH; 100 ml. of which contains 4 g of NaOH is

Solution:
QUESTION: 117

In which one of the following transition metal complexes does the metal exhibit in zero oxidation state?

Solution:
QUESTION: 118

Which of the following has asymmetric carbon atoms?

Solution:
QUESTION: 119

Haemoglobin contains 0.334% of iron by weight. If molecular weight of haemoglobin is approximately 67200, then the number of iron atoms (At.wt. of Fe is 56) present in one molecule of haemoglobin are

Solution:

Percentage of Fe = 0.33% molecular weight of haemoglobin
Therefore,
Weight of Fe present = x 67200 = 221.76
Atomic mass of Fe = 56
Number of approximate atoms present = = 3.96 ∼ 4
Hence, there are 4 Fe atoms in one haemoglobin molecule

QUESTION: 120

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): Phenetole on cleavage with HI yields phenol and ethyl iodide.
Reason(R): Phenetole is a mixed aromatic ether.

Solution:
QUESTION: 121

Ligament connects

Solution:
QUESTION: 122

Elephantiasis is spread by

Solution:
QUESTION: 123

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 cymose in inflorescence, the main axis shows continuous growth.
Reason (R): The arrangement of flower in this inflorescence is centrifugal.

Solution:
QUESTION: 124

During migration, birds determine compass direction using:

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): Clones are group of organism of identical genotype, produced by same kind of sexual reproduction and same sexual processes.
Reason(R): These are prepared by a group of cells that descended from many cells or by inbreeding of a completely heterozygous line.

Solution:

Clone is a group of cells descended from the same single parent cell. In most of the cases, nucleic acid sequences are said to be cloned when they are inserted into vectors such as plasmids and copied within host cells during gene manipulation.

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): Smaller the organism higher is the rate of metabolism per gram weight.
Reason(R): The heart rate of a six month old baby is much higher than that of an old person

Solution:

The basal metabolic rate is defined as the energy requirement of the human body at rest reflects the caloric needs of the body.BMR can be determined by total body weight and the amount of muscle mass. BMR is inversely related with the weight or volume of an organism, which means the smaller the organism higher is the basal metabolic rate.
Heart rate of six month old baby is 110 to 112 beats/minute. Though it is higher then normal adult person, but it is lower than the old person.At the age of 60 years a man have maximum heart rate of 160 beats/minute.

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): In plant tissue culture, somatic embryos can be induced from any plant cell.
Reason(R): Any viable plant cell can differentiate into somatic embryos.

Solution:

Any viable somatic cell of a plant has the ability to form full fledged plants. This ability of plant cell is known as cellular totipotency.

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): Plants possessing C4- pathway of carbon fixation have a higher net primary productivity than the C3-pathway possessing plants.
Reason(R): For each unit weight of fixed carbon, C4- pathway possessing plants require less water than the C3-pathway possessing plants.

Solution:

C3 plants exclusively fix CO2 via the Calvin Benson pathway. The leaf cells of C4 plants possess two types of chloroplast, bundle sheath cells and mesophyll cells. The mesophyll cells of C4 plants mesophyll cells. The mesophyll cells of C4 plants carboxylase, which catalyses the fixation of CO2 with PEP to form oxaloacetic acid. The bundle sheath cells exhibit high RuBP carboxylase and the other enzymes of the Calvin-Benson cycle. C4 plants are highly productive photosynthetically in view of the low affinity of RuBP carboxylase for its substrate. But CO2 is concentrated as C4 acids due to the activity of the PEP carboxylase, which in effect maintains high pool levels of CO2. C4 plants are related to very high light-harvesting saturation points. C4 plants exhibit low rates of photorespiration only in bundle sheath cells. C4 plants are adapted to high temperature. C4 plants show better utilization of available water but it cannot be the cause of its higher productivity.

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): An organism with lethal mutation may not even develop beyond the zygote stage.
Reason(R): All types of gene mutations are lethal.

Solution:

Mutations are sudden and abruptive qualitative or quantitative change in the genetic material of an organism. According to their effects on the phenotype, mutations may be classified as lethals, and supervitals. Lethal mutations results in death of the cells or organism in which they occur. The organism may not even develop beyond the zygote stage. Subvital reduces the chances of survival. Supervital mutations results in the improvement of biological fitness under certain conditions. There may also be mutations which are neither harmful nor beneficial to the organisms in which they occur.

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): Mangroves show breathing roots.
Reason (R): Soil air is almost negligible in swamps.

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): Secreting hypotonic urine is effective in reducing urinary loss of water.
Reason(R): Hypotonic urine is more concentrated and higher in osmotic pressure than the blood.

Solution:

When there is a threat of excessive water loss from the body of the animal then the urine excreted needs to be hypertonic and not hypotonic because excessive water loss from the body possess the threat of a rise in osmoconcentration of blood. Since hypertonic urine is more concentrated and higher in osmotic pressure than the blood, therefore it helps in reducing the loss of water with urine.
Human urine is hypertonic which is more concentrated than the blood.So an isotonic glomeruler filterate is first filtered into the Bowman's capsules of nephrons in kidneys. The tubules of nephrons then reabsorb a large volume of water from the glomerular filtrate not accompained by the reabsorption of proportionate amounts of solutes. This leaves the urine more concentrated than the blood which is very effective in reducing the urinary loss of water.

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

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): Polytene chromosomes have a high amount of DNA.
Reason(R): Polytene chromosomes are formed by repeated replication of chromosomal DNA without separation of chromatids.

Solution:

Polytene chromosomes are quite common in salivary glands of insects and so are called salivary chromosomes. These chromosomes have high amount of DNA of almost 1000 times in Drosophila as compared to ordinary somatic chromosomes. These chromosomes are multistranded. They are in permanent prophase stage. These chromosomes are formed by somatic pairing between homologous chromosomes and repeated replication of their chromonemata without separation of chromatids. All the chromosomes may remain attached to one another at a common point called chromocentre.

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): Typhoid carriers may be cured by surgical removal of their spleen.
Reason(R): The disease germs remain concentrated in it.

Solution:

Typhoid carriers may be interfered by surgical removal of gall bladder. As the bacteria are more concentrated in the gall bladder. But this typhoid bacilli may take up a natural habitat somewhere in the intestinal tract independent of the gall bladder.

QUESTION: 135

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): Medullary rays are called pith rays in higher plants.
Reason (R): Pith cells are found between the vascular bundles.

Solution:
QUESTION: 136

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): Glogi complex forms zymogen granules.
Reason (R): The process is called vitellogenesis in oocytes.

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): In morula stage, the cells divide without any increase in size.
Reason(R): Zona pellucida remains undivided till cleavage is complete.

Solution:

After fertilization the zygote undergoes a number of mitotic divisions known as cleavage. Cleavage produces a solid ball of small blastomeres. Th embryo now looks like a mulberry and is known as morula.Cleavage restores the cell size and nucleocytoplasmic ratio characteristic of the species.
Zona pellucida is a glycoprotein layer found in eggs of mammals. It remains undivided till the cleavage is complete.Blastocyst is a product of cleavage and is surrounded by zona pellucida.

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): Amber codon is a termination codon.
Reason(R): If in m-RNA, a termination codon is present, the protein synthesis stops abruptly whether the protein synthesis is completed or not.

Solution:

There are three codons UAA, UAG and UGA which are designated as termination codons. UAA (also known as ochre), UAG (also known as amber) and UGA (also known as opal) are three codons which whenever present in mRNA, would bring about termination of polypeptide chain which would then be released from ribosome. m-RNA has a "termination codon" region which consists of UAA, UAG or UGA.So Amber alone can not terminate the process of protein synthesis.

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): Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals.
Reason(R): Eggs of most mammals, including humans, are of centrolecithal type.

Solution:

In holoblastic cleavage the cleavage furrows bisect the entire egg, or in other words entire egg divides by each cleavage furrow in placental mammals having isolecithal or microlecithal egg the holoblastic cleavage produces blastomeres of equal or approximately equal size.
Centrolecithal eggs are found in insects and in some hydrozoa. Here yolk is concentrated at the centre of egg and the cytoplasm is present surrounding it. Meroblastic cleavage occurs in them.

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): The hair of cotton has lignin thickening.
Reason (R): In aerial parts, epidermal hair serves for defence.

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): Water and mineral uptake by root hairs from the soil occurs through apoplast until it reaches endodermis.
Reason(R): Casparian strips in endodermis are suberized.

Solution:

The apoplast is the system of adadjcent cell walls which is continuous through the plant. As water evaporates from the mesophyll cell walls into the intercellular air spaces, tension develops in the continuous stream of water in the apoplast, and water is drawn through the walls in a mass flow by the cohesion of water molecules.
When water through spaces in the cell wall reaches the endodermis then it is stopped by a waterproff substance called suberin which is deposited in cell walls in the form of bands called casparian strips.Therefore water and ssolutes must pass through the cell surface membrane and into the cytoplasm of the cells of the endodermis.

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): Estuaries are generally productive.
Reason (R): An estuary is formed by river.

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): The gutted liquid is pure water.
Reason (R): Guttation generally is found in humid tropical areas.

Solution:
QUESTION: 144

Blood pressure will be at its highest when

Solution:
QUESTION: 145

Oval and eccentric starch grains occur in

Solution:
QUESTION: 146

R.Q. of germinating castor seed is-

Solution:
QUESTION: 147

Which of the following is not a source of drug?

Solution:
QUESTION: 148

Which of the following is a medicinal plant?

Solution:
QUESTION: 149

AGCT are nitrogenous bases of DNA. The pairing is :

Solution:
QUESTION: 150

Two glands that are responsible for secreting protein-digesting enzymes are

Solution:
QUESTION: 151

Jute is grown on a large scale in India in

Solution:
QUESTION: 152

Reverse transcriptase

Solution:
QUESTION: 153

The major advantage of bipedal locomotion is that it

Solution:
QUESTION: 154

A sequence of DNA genetic code specifying a polypeptide is a

Solution:
QUESTION: 155

If an albino marries a normal woman and 50% offspring are albino, the woman is

Solution:
QUESTION: 156

Parents are heterozygous albino. What will be the first three children?

Solution:
QUESTION: 157

Antibody production is carried out by

Solution:
QUESTION: 158

Events in body defence against infection is

Solution:
QUESTION: 159

A kind of allergy is

Solution:
QUESTION: 160

Rhipidium inflorescence of Solanum nigrum is

Solution:
QUESTION: 161

AIDS spreads due to

Solution:
QUESTION: 162

A protein rich organisms is

Solution:
QUESTION: 163

Leprosy is caused by

Solution:
QUESTION: 164

Interval cork of Apple/browning of cauliflower is deficiency symptom of

Solution:
QUESTION: 165

Which of the components of the nervous system has both autonomic and somatic divisions?

Solution:
QUESTION: 166

Water soluble pigment is

Solution: Anthocyanins are water-soluble flavonoid pigments that appear red to blue, according to pH. They occur in all tissues of higher plants, providing color in leaves, plant stem, roots, flowers, and fruits, though not always in sufficient quantities to be noticeable.
QUESTION: 167

Companion cells are usually seen associated with

Solution:
QUESTION: 168

The conversion of nitrate to nitrous oxide and nitrogen gas is termed as

Solution:
QUESTION: 169

A narrow thin-walled cell with large nucleus and lying on the side of sieve tube is absent in

Solution:
QUESTION: 170

ATP formation in chloroplast and mitochondrion is explained by

Solution:

Chemiosmotic coupling hypothesis is the most widely accepted explanation for oxidative phosphorylation in mitochondria and photophos- phorylation in thylakoid membranes. Mitchell proposed the idea of chemiosmotic coupling.
He suggested that a concentration gradient of protons is established across the mitochondrial membrane because there is an accumulation of hydrogen ions on one side of the mitochondrial membrane. The proton accumulation is necessary for energy transfer to the endergonic ADP phosphorylation process.

QUESTION: 171

5th June is

Solution:
QUESTION: 172

Casein contained in milk is