NEET Practice Test - 2 - NEET MCQ

# NEET Practice Test - 2 - NEET MCQ

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## 180 Questions MCQ Test - NEET Practice Test - 2

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NEET Practice Test - 2 - Question 1

### The velocity 'v' of a particle at time 't' is given by 'v' = where 'a', 'b' and 'c' are constants. The dimensions of 'a', 'b' and 'c' are

Detailed Solution for NEET Practice Test - 2 - Question 1
'at' must have the dimensions of velocity.

So, let the dimensions of 'a' be [MxLyTz].

[MxLyTz][T] = [M0L1T-1]

[MxLyTz] = [M0L1T-2]

Hence, the dimensions of 'a' = [L1T-2]

c should have dimensions of time as c and t are added. (Two physical quantities which are added or subtracted should have same dimensions)

Only option (1) satisfies the given result.

NEET Practice Test - 2 - Question 2

### A particle moves for 20 seconds with velocity 3 m/s, then moves with velocity 4 m/s for another 20 seconds, and finally moves with velocity 5 m/s for the next 20 seconds. What is the average velocity of the particle?

Detailed Solution for NEET Practice Test - 2 - Question 2
Average velocity and instantaneous velocities have same value in a uniform motion. Average velocity is that uniform velocity with which the object will cover the same displacement in same interval of time as it does with its actual variable velocity during that time interval.

Here, total distance covered

= (3 m/s × 20 s) + (4 m/s × 20 s) + (5 m/s × 20 s)

= (60 + 80 + 100) = 240 m

Total time taken = 20 + 20 + 20

= 60 s

∴ Average velocity = 240/60 = 4m/s

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NEET Practice Test - 2 - Question 3

### A block of ice of mass 10 kg slides down an inclined 5 m long and 3 m high. A man pushes up on the ice block parallel to the incline so that it slides down at a constant speed. The coefficient of friction between the ice and the incline is 0.1. Find the work done by the man on the block. (g = 10 m/s2)

Detailed Solution for NEET Practice Test - 2 - Question 3
From the figure, sin θ = 3/5 and cos θ = F.D.B. of the block

F = force by the man

f = frictional force

N = normal reaction of the surface

mg = gravity

Since the block slides at a constant speed,

mg sin θ = F + f

⇒ F = mg sin θ – f

as f = μ mg cosθ

(A) Wm = cos 180 = – FS

Here, F = 52 N and S = 5 m

⇒ Wm = –52 5 J = – 260 J

NEET Practice Test - 2 - Question 4

Two blocks of masses 1 kg and 2 kg are connected by a metal wire going over a smooth pulley as shown. The breaking stress of the metal is If g = 10 ms-2, what should be the minimum radius of the wire used if it is not to break?

Detailed Solution for NEET Practice Test - 2 - Question 4

If r is the minimum radius, then

NEET Practice Test - 2 - Question 5

A drum of radius R full of liquid of density d is rotated at ω rad/s. The increase in pressure at the centre of the drum will be:

Detailed Solution for NEET Practice Test - 2 - Question 5
When an incompressible and non-viscous liquids flows in streamlined motion from one place to another, then at every point of its path, the total energy per unit volume is constant.

where P is pressure, p is density, v is velocity and h is height.

Also, v = Rω; where R is radius and ω is angular velocity.

Since velocity at the centre is zero and density p = d, we have

Thus, increase in pressure,

NEET Practice Test - 2 - Question 6

What is the self-inductance of an air-core solenoid of length 3.14 m and cross-sectional area 10–3 m2 with 500 turns?

Detailed Solution for NEET Practice Test - 2 - Question 6

= 10-4 H = 0.1 mH

Hence the correct choice is (1).

NEET Practice Test - 2 - Question 7

If a current of 2 A flows through a coil, then the flux linked with the coil is 2 Weber. If the current through the coil changes at the rate of 1 A/s, then the EMF induced in the coil is

Detailed Solution for NEET Practice Test - 2 - Question 7
I = 2 A

L = self-inductance

ϕ = 2 Weber

dl/dt = 1 A/s

ϕ = Li

L = ϕ/i

L = 1 wb

Induced emf,

e = –1 × 1

e = –1

The magnitude of e is 1 V.

NEET Practice Test - 2 - Question 8

Which of the following figures represents the variation of particle momentum and associated de Broglie wavelength?

Detailed Solution for NEET Practice Test - 2 - Question 8
Since we know that p is proportional to 1/λ, so option 4 is the correct answer.
NEET Practice Test - 2 - Question 9

A car moving with a speed of 50 km/h can be stopped by brakes after at least 6 m. If the same car is moving at a speed of 100 km/h, the minimum stopping distance is

Detailed Solution for NEET Practice Test - 2 - Question 9
Using v2 - u2 = 2as

As v = 0,

s' = 4s = 24 m

NEET Practice Test - 2 - Question 10

When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be

Detailed Solution for NEET Practice Test - 2 - Question 10
Power of each bulb = 60 W

When three bulbs are connected in series, power drawn will be

NEET Practice Test - 2 - Question 11

A string of length 'L' is fixed at one end and carries a mass 'M' at the other end. The string makes 2/π revolutions per second around the vertical axis through the fixed end as shown in the figure. The tension in the string is

Detailed Solution for NEET Practice Test - 2 - Question 11

By the diagram T sin θ =

T cos θ = mg

Linear velocity v = rω and sin θ = r/L

Putting these values in eq (i)

we know ω = 2πn

NEET Practice Test - 2 - Question 12

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. The force constant of the longer piece will be

Detailed Solution for NEET Practice Test - 2 - Question 12
The force constant of a spring is inversely proportional to its length. A spring of length L is cut into two pieces of lengths x and (L - x), such that x = 2 (L - x) or x = 2L/3

The force constant of the spring of length x is related to the force constant k of the complete spring of length L as,

NEET Practice Test - 2 - Question 13

The ratio of the velocity of sound in hydrogen (γ = 7/5) to that in helium (γ = 5/3) at the same temperature is

Detailed Solution for NEET Practice Test - 2 - Question 13
Velocity of sound in a gas

As

NEET Practice Test - 2 - Question 14

A particle of mass m carrying charge q is kept at rest in a uniform electric field E and then released. The kinetic energy gained by the particle, when it moves through a distance y, is

Detailed Solution for NEET Practice Test - 2 - Question 14
Using conservation of energy

Increase in kinetic energy = Decrease in potential energy K - 0 = q(-dV) ⇒ K = qEy, where q(-dV) is decrease in potential energy. As displacement and electric field are along the same direction, dV = -Ey.

NEET Practice Test - 2 - Question 15

The magnetic field at a distance r from a long wire carrying current i is 0.4 T. The magnetic field at a distance 2r is

Detailed Solution for NEET Practice Test - 2 - Question 15
Magnetic field at any point due to the straight wire is inversely proportional to the distance from the wire.

Magnetic field at a distance 2r from the wire is B'.

NEET Practice Test - 2 - Question 16

Charge through a cross-section of a conductor is given by Q = (3t2 + 2) C (where t is time in second). The average current through the conductor in the interval t = 1 s to t = 3 s will be

Detailed Solution for NEET Practice Test - 2 - Question 16

NEET Practice Test - 2 - Question 17

Mobility of free electron in a current carrying conductor is proportional to

Detailed Solution for NEET Practice Test - 2 - Question 17
Mobility of free electron depend upon relaxation time
NEET Practice Test - 2 - Question 18

Figure shows graph between / and V for two conductors A and B. Their respective resistances are in the ratio

Detailed Solution for NEET Practice Test - 2 - Question 18
RA = tan 60°

RB = tan 30°

NEET Practice Test - 2 - Question 19

The current through the 5 Ω resistance connected across AB as shown in the given circuit is

Detailed Solution for NEET Practice Test - 2 - Question 19

NEET Practice Test - 2 - Question 20

The equivalent resistance between A and B as shown in the given circuit is

Detailed Solution for NEET Practice Test - 2 - Question 20

Circuit is balanced Wheatstone bridge

NEET Practice Test - 2 - Question 21

A potential difference of 10 V is applied across a conductor of length 5 cm. If drift velocity of electron is 2 x 104 m/s, then electron mobility in (m2V-1s-1) will be

Detailed Solution for NEET Practice Test - 2 - Question 21

NEET Practice Test - 2 - Question 22

A galvanometer of resistance 50 Ω gives full scale deflection at 3 mA current. What should be value of shunt so that it can measure a current of 28 mA?

Detailed Solution for NEET Practice Test - 2 - Question 22
IgRg = RS(I - Ig)

50 x 3 = Rs (28 - 3)

= 6 Ω

NEET Practice Test - 2 - Question 23

Five hundred cells of same emf E and same internal resistance r are connected in series to form a loop in same order (without external resistance). The potential drop across 199 cells is found to be

Detailed Solution for NEET Practice Test - 2 - Question 23
Current through the circuit

i = E/r

= 0

NEET Practice Test - 2 - Question 24

The power dissipated in 3 Ω resistance as shown in the circuit is

Detailed Solution for NEET Practice Test - 2 - Question 24

NEET Practice Test - 2 - Question 25

The resultant resistance value of three resistors each of r Ω are connected in series is x. When given three resistances are connected in parallel, the resultant value is

Detailed Solution for NEET Practice Test - 2 - Question 25
In series

3r = x

r = x/3

In parallel

r/3 = x/9

NEET Practice Test - 2 - Question 26

In a potentiometer experiment the balancing length of the cell was found to be 80 cm. Now, a resistance of 8 Ω is connected across the terminal of this cell the balancing length becomes 60 cm. The internal resistance of this cell is

Detailed Solution for NEET Practice Test - 2 - Question 26

NEET Practice Test - 2 - Question 27

The potential difference between points A and B as shown in the given circuit will be

Detailed Solution for NEET Practice Test - 2 - Question 27

NEET Practice Test - 2 - Question 28

A charged particle moves through a magnetic field perpendicular to its direction, then

Detailed Solution for NEET Practice Test - 2 - Question 28
Momentum of the particle will change and kinetic energy remains same.
NEET Practice Test - 2 - Question 29

When a 20 V m-1 electric field is produced inside a conductor and 4 x 104 A m-2 current density is established in it. Resistivity of the conductor is

Detailed Solution for NEET Practice Test - 2 - Question 29

NEET Practice Test - 2 - Question 30

The drift velocity of the electrons in a current carrying conductor is of the order of:

Detailed Solution for NEET Practice Test - 2 - Question 30
Drift velocity of electrons in a conductor is of the order of 10-4 m/s.
NEET Practice Test - 2 - Question 31

Kilowatt hour is the unit of

Detailed Solution for NEET Practice Test - 2 - Question 31
The kilowatt hour is the unit of energy.
NEET Practice Test - 2 - Question 32

A simple potentiometer circuit is shown in the figure. The internal resistance of the 10 V battery is negligible, AB Is the uniform wire of resistance 4 Ω and length 100 cm. If deflection of the galvanometer is zero. Then length AB will be

Detailed Solution for NEET Practice Test - 2 - Question 32
Current in the circuit

NEET Practice Test - 2 - Question 33

Directions: Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer.

You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion: The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.

Reason: Velocity is a vector quantity and speed is a scalar quantity.

Detailed Solution for NEET Practice Test - 2 - Question 33
Because displacement ≤ distance and so average velocity ≤ average speed.
NEET Practice Test - 2 - Question 34

Match List-I with List-II:

Choose the correct answer from the options given below:

Detailed Solution for NEET Practice Test - 2 - Question 34

Step 1: Find the dimensions of each quantity.

Dimensions of gravitational constant, [G] = [M-1L3T-2]

Dimensions of gravitational potential energy, [U] = [ML2T-2]

Dimensions of gravitational potential, [U] = [L2T-2]

Dimensions of gravitational intensity, [I] = [LT-2]

NEET Practice Test - 2 - Question 35

Statement I: (Newton's 1st Law of Motion) Every body continues in its state of rest or of uniform motion in a straight line except in so far as it be compelled by an externally impressed force to act otherwise.

Statement II: It is observed that when a car brakes suddenly, the passengers are thrown forward.

Detailed Solution for NEET Practice Test - 2 - Question 35
If the net external force on a body is zero, its acceleration is zero. Acceleration can be non zero only if there is a net external force on the body.
NEET Practice Test - 2 - Question 36

In Young's double slit experiment, if the distance between the slits and the screen is doubled and the separation between the slits is reduced to half, the fringe width

Detailed Solution for NEET Practice Test - 2 - Question 36
Since β = λD/d, if D is doubled and d is halved, the fringe width β will become four times. Hence the correct choice is (2).
NEET Practice Test - 2 - Question 37

A balloon of mass M is rising up with an acceleration a. If a mass m is removed from the balloon, its acceleration becomes:

Detailed Solution for NEET Practice Test - 2 - Question 37
The forces acting on the balloon are its weight acting downwards and upthrust F acting upwards.

Thus F - Mg = ma ...(i)

When mass m is removed, we have

F - (M - m) g = (M - m) a' ...(ii)

where a' is the new acceleration. Eliminating F from (i) and (ii) and simplifying we get a'

NEET Practice Test - 2 - Question 38

A rocket is launched vertically from the surface of Earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by

Detailed Solution for NEET Practice Test - 2 - Question 38
On the surface of the earth, the total energy is KE + PE

where m is the mass of the rocket and M that of earth. At the highest point, v = 0 and the energy is entirely potential.

where h is the maximum height attained. From the law of conservation of energy, we have

Hence the correct choice is (1).

NEET Practice Test - 2 - Question 39

The dimensions of (μ0ε0)-1/2 are

Detailed Solution for NEET Practice Test - 2 - Question 39
We know that the speed of an electromagnetic wave is given by

Therefore, (μ0ε0)-1/2 has the dimensions the same as that of speed.

∴ Dimensions: LT-1

NEET Practice Test - 2 - Question 40

A body of mass m hits normally a rigid wall with velocity v and bounces back with the same velocity. The impulse experienced by the body is

Detailed Solution for NEET Practice Test - 2 - Question 40
Let initially the body be moving along the positive x-axis with speed v.

So, momentum of the body initially,

After bouncing back, the body moves along the negative x-axis with same speed.

So, momentum of the body finally,

Thus, change in momentum of body,

Impulse experienced, 1 = Δp = -2

NEET Practice Test - 2 - Question 41

A container having 1 mole1 mole of a gas at a temperature 27℃ has a movable piston which maintains at constant pressure in container of 1 atm1 atm. The gas is compressed until temperature becomes 127℃. The work done is

Detailed Solution for NEET Practice Test - 2 - Question 41
Work done at constant pressure is

W = p ΔV = nR ΔT

Where p is presure, ∆V the volume change, R the gas constant, ∆T the change in temperature and n the number of moles.

Given, n = 1, T2 = 127℃ = 400K

∴ W = 1 × 8.314 × (400 − 300)

W = 831.4 J

NEET Practice Test - 2 - Question 42

Beats are produced by two travelling waves each of loudness I and nearly equal frequencies n1 and n2. The beat frequency will be_______and maximum loudness heard will be________.

Detailed Solution for NEET Practice Test - 2 - Question 42
Beat frequency = number of beats s−1

= n1 − n2

And maximum loudness = (a + a)2 = 4a2 = 4I

NEET Practice Test - 2 - Question 43

Directions: Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion: The position-time graph of a uniform motion, in one dimension of a body cannot have negative slope.

Reason: In one – dimensional motion the position does not reverse, so it cannot have a negative slope.

Detailed Solution for NEET Practice Test - 2 - Question 43
The negative slope of the position-time graph represents that the body is moving towards the negative direction. Thus the assertion is correct. But if the slope of the graph decrease with time then it represents the decrease in speed i.e. retardation in motion. So, the constant negative slope of the position-time graph can not represent the decrease in speed. Therefore, the reason is incorrect.
NEET Practice Test - 2 - Question 44

Match the units mentioned in List-I with the units in List-II.

Detailed Solution for NEET Practice Test - 2 - Question 44
Hint: Henry is the SI unit of inductance.

Step 1: Convert each option in list-I into appropriate units.

NEET Practice Test - 2 - Question 45

A block of mass M lies at rest on a horizontal table.

Statement I: (Newton's 3rd Law) To every action, there is an equal and opposite reaction. Action and reaction forces act on different bodies and in opposite directions.

Statement II: The normal reaction is the reaction force, while the weight is the action.

Detailed Solution for NEET Practice Test - 2 - Question 45
To every action, there is always an equal and opposite reaction.

Newton’s wording of the third law is so crisp and beautiful that it has become a part of common language. For the same reason perhaps, misconceptions about the third law abound. Let us note some important points about the third law, particularly in regard to the usage of the terms : action and reaction.

NEET Practice Test - 2 - Question 46

Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

Detailed Solution for NEET Practice Test - 2 - Question 46
SN1 substitution proceeds through the formation of a carbocation intermediate and the preference for this mechanism depends on the stability of the carbocation formed.

The order of preference is as follows: benzyl > allyl > tertiary > primary > secondary > primary > alkyl halides.

Moreover, SN1 reaction is favoured over SN2 by heavy groups on the carbon atom attached to halogen due to steric hindrance.

Since benzyl carbocation is resonance stabilised, nucleophilic substitution of Benzyl chloride invariably proceeds through SN1.

NEET Practice Test - 2 - Question 47

The order of stability of the following carbocations is

Detailed Solution for NEET Practice Test - 2 - Question 47
Order of stability is III > I > II.

(Stability ∞ extent of delocalization)

NEET Practice Test - 2 - Question 48

According to Fajan's rule, which of the following ions shows the greatest polarising power?

Detailed Solution for NEET Practice Test - 2 - Question 48
The smaller the size of cation, the more the polarising power.
NEET Practice Test - 2 - Question 49

The correct order of covalent character of the following compounds is

Detailed Solution for NEET Practice Test - 2 - Question 49
High polarisability of the iodide ion among the halide ions stems from larger size, where the outer electrons are more loosely held and can be more easily distorted by the cation. Hence, the covalent character is maximum in AlI3 and least in case of AlF3.
NEET Practice Test - 2 - Question 50

If ∆0 < P, then the electronic configuration for a d4 system will be

Detailed Solution for NEET Practice Test - 2 - Question 50
If ∆0 < P, then the electronic configuration for d4 system will be t2g3 eg1.
NEET Practice Test - 2 - Question 51

The temperature of a fixed mass of a gas increases from 10 K to 50 K. How will the volume be affected?

Detailed Solution for NEET Practice Test - 2 - Question 51

According to Charles's law, volume varies directly as temperature at a constant pressure.

Thus, if temperature increases five times from 10 K to 50 K, then volume will also increase by five times the original value.

NEET Practice Test - 2 - Question 52

At what pH will a solution be acidic at 100°C? (Kw at 100°C = 5.6 x 10-13)

Detailed Solution for NEET Practice Test - 2 - Question 52
Kw = [H3O+] [-OH]

In water, [H3O+] = [-OH]

So, Kw = [H3O+]2

log Kw = 2 log [H3O+]

pH = - log [H3O+] = - log Kw = - log {5.6 x 10-13}

= 6.1259 (for neutral solution)

Below this pH, the solution is acidic in nature.

NEET Practice Test - 2 - Question 53

Which of the following bases is not present in RNA?

Detailed Solution for NEET Practice Test - 2 - Question 53
DNA contains thymine instead of uracil.

The nitrogenous bases in DNA are:

Adenine and thymine, which are purines

Cytosine and guanine, which are pyrimidines

The RNA molecule contains uracil instead of thymine.

NEET Practice Test - 2 - Question 54

Match the items of Column I with items of Column II and choose the correct option.

Detailed Solution for NEET Practice Test - 2 - Question 54
Ethylene glycol (antifreeze) is used in the cooling of a car radiator during the winter because it has a much lower freezing point than water.

Ethanol is a good solvent for fatty and waxy substances. Fats and waxes provide odour to perfumes. Apart from being a good solvent, it is less irritating to the skin. So, it is used in perfumes.

Now-a-days, methyl alcohol is mostly manufactured from water gas. Methyl alcohol obtained by this method is 99% pure.

Phenol is an antiseptic and disinfectant. It is active against a wide range of micro-organisms including some fungi and viruses.

NEET Practice Test - 2 - Question 55

The hybridisation and the geometry of ICl3 in liquid phase are ____ and _____, respectively.

Detailed Solution for NEET Practice Test - 2 - Question 55
ICI3 has T-shaped structure with sp3d hybridisation.

In ICl3, there are three bond pairs and two lone pairs, which are arranged in trigonal bipyramidal geometry.

It is T-shaped. Two of the bond pairs occupy axial positions and the third one occupies equatorial position.

The two lone pairs, therefore, are arranged at equatorial positions by making an angle of 120° with each other.

NEET Practice Test - 2 - Question 56

Consider the polymerisation reactions provided in the options. Which of these will produce thermosetting polymer?

Detailed Solution for NEET Practice Test - 2 - Question 56
Phenol + Formaldehyde produces Bakelite, which is thermosetting due to highly cross-linked polymer chains.

Though p-cresol with formaldehyde (HCHO) produces phenol-formaldehyde based polymer, but methyl group at para position in phenol prevents cross-linking of polymer chains which causes polymer to become fusible.

In options (3) and (4), nylon-6 and Dacron are produced, respectively and these are thermoplastics.

NEET Practice Test - 2 - Question 57

Na+, Mg++, Al3+ and Si4+ are isoelectronic. The order of their ionic size is

Detailed Solution for NEET Practice Test - 2 - Question 57
Amongst isoelectronic ions, the size of the cation decreases as the magnitude of the charge increases.
NEET Practice Test - 2 - Question 58

Which among the following is a geminal dihalide?

Detailed Solution for NEET Practice Test - 2 - Question 58
1,1-dichloroethane (ethylidene dihalide) is a geminal dihalide.
NEET Practice Test - 2 - Question 59

Detailed Solution for NEET Practice Test - 2 - Question 59
Ammonium ion has no resonance structures. So, no delocalized orbitals are present.
NEET Practice Test - 2 - Question 60

The number of geometrical isomers of [Cr(NH3)(OH)2Cl3]2– ion is

Detailed Solution for NEET Practice Test - 2 - Question 60
There are three geometrical isomers

NEET Practice Test - 2 - Question 61

The compound in which metal exhibits more than one oxidation states, is

Detailed Solution for NEET Practice Test - 2 - Question 61
Fe0.94O = x × Fe3++ (0.94 − x)Fe2+ + O2− x(+3) + (0.94 – x) × (+2) + (–2) × 1 = 0 x = 0.12 Fe3+
NEET Practice Test - 2 - Question 62

Among the following, the species which cannot disproportionate is

Detailed Solution for NEET Practice Test - 2 - Question 62
C-atom is in maximum +4 oxidation state
NEET Practice Test - 2 - Question 63

The type of silicate unit present in Beryl silicate {Be3Al2[Si6O18]} is

Detailed Solution for NEET Practice Test - 2 - Question 63
(Si6O18)12– are cyclic silicates
NEET Practice Test - 2 - Question 64

Select the element having lowest atomic radius.