# AIIMS Physics Mock Test - 8

## 60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Physics Mock Test - 8

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Attempt AIIMS Physics Mock Test - 8 | 60 questions in 60 minutes | Mock test for NEET preparation | Free important questions MCQ to study AIIMS Mock Tests & Previous Year Papers for NEET Exam | Download free PDF with solutions
QUESTION: 1

### When speed of electrons is very large the specific charge

Solution:

If the speed of electron increases, its specific charge decreases

QUESTION: 2

Solution:
QUESTION: 3

### A metal foil of negligible thickness is introduced between two plates of a capacitor of capacitance C at the centre. The new capacitance of the capacitor will be

Solution:
QUESTION: 4

A 4 V battery of internal resistance 1 Ω sends a current through a 3 Ω resistor. The terminal potential difference is

Solution:
QUESTION: 5

The work function of aluminium is 4.125 eV. The cutoff wavelength for photoelectric effect for aluminium will be

Solution:
QUESTION: 6

A bullet of mass X moves with a velocity Y, hits a wooden block of mass Z at rest and gets embedded in it. After collision the wooden block with bullet moves with a velocity

Solution:
QUESTION: 7

In Thomson experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass 208 times that of electrons). No deflection condition in this case satisfied if

Solution:
QUESTION: 8

X-rays are produced due to

Solution:
QUESTION: 9

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

Solution:
QUESTION: 10

In transformer, core is made of soft iron to reduce

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QUESTION: 11

When a.d.c. motor operates at 200 V, its initial current is 5 A, but when it runs at maximum speed, the current is only 3 A. What is its back emf ?

Solution:
QUESTION: 12

A step up transformer operates on a 230 volt line and supplies 2 amp to a load. The ratio of primary and secondary windings is 1:25. Determine the primary current .

Solution:

Ep = 230 V, Is = 2 amp. or Op = ?

QUESTION: 13

A light bulb and a parallel plate capacitor (including a dielectric material between the plates) are connected in series to the 60-Hz ac voltage at a wall outlet. When the dielectric material is removed from the space between the plates, does the brightness of the bulb,

Solution:
QUESTION: 14

According to Maxwell's hypothesis, a changing electric field gives rise to

Solution:
QUESTION: 15

A charge Q is divided into two parts as q and (Q - q) so that for any given separation between q and (Q - q), the electrostatic interaction between q and (Q - q) is maximum. The ratio Q/q is

Solution:
QUESTION: 16

The total flux of the electric field through the six faces of a certain cube is + φ E where φ E is a positive constant. Which of the following statements is not necessarily true?

Solution:
QUESTION: 17

If the unit of force and length be each increased by four times, then the unit of energy is increased by

Solution:
QUESTION: 18

A body of mass 2 kg is thrown up vertically with kinetic energy of 490 joules. If the acceleration due to gravity is 9.8 m/s2, then the height at which the K.E. of the body becomes half its original value is given by

Solution:
QUESTION: 19

A black body, at a temperature of 227ºC, radiates heat at a rate of 84 J-m⁻2-s⁻1. When its temperature is raised to 727ºC, the heat radiated by it in J-m⁻2-s⁻1 will be

Solution:
QUESTION: 20

An electric iron which when hot has a resistance of 80Ω, is used on a 200 V source. Calculate the electric energy spent in kilowatt-hour if it is used for 2 hours.

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

The force between two short bar magnets with magnetic moments M₁ and M₂ whose centres are r meter apart is 8 N, when their axes are in same line. If the separation is increased to 2 r, the force between them is reduced to

Solution:
QUESTION: 23

A wire of length L and area of cross-section A is made of material of Young's modulus y. If the wire is stretched by the amount x, the work done is

Solution:
QUESTION: 24

A cork is submerged in water by a spring attached to the bottom of a pail. When the pail is kept in elevator moving with acceleration downwards, the spring length

Solution:
QUESTION: 25

The first artificial disintegration of an atomic nucleus was achieved by

Solution:
QUESTION: 26

A lift is descending with an acceleration of 0.5 g. The time period of a simple pendulum suspended from its ceiling, if its time-period in stationary lift is 10 s, will be

Solution:
QUESTION: 27

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Friction helps motion of body.
Reason(R): Friction is electromagnetic in motion.

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): Normal stress to volumetric strain will be the Bulk modulus of the given gas.
Reason(R): Compressibility is the reciprocal of Bulk modulus.

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): SI unit of T-m2/s is equivalent to volts.
Reason(R): Both are the units of potential difference

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): A hollow-cylinder and a solid cylinder, each of the same mass will roll down the same incline at different speeds.
Reason(R) : The frictional forces in the two cases may be different.

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): If a battery is connected across a circuit consisting of two identical capacitors and it is found that, in steady state, two capacitors have equal charge the two capacitors must be in series with each other.
Reason(R): When capacitors are in series, same charge passes through the capacitors.

Solution:
QUESTION: 32

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The expression L = E R + r (where i is current E the emf,and (R + r) total resistance) express the law of conservation of energy for the electrical circuit).
Reason(R): When no current is being drawn from the cell then the potential difference across the plates of the cell equals the emf of the cell.

Solution:
QUESTION: 33

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): When 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: 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): Work function of sodium is 2eV, light of wavelength 7000Å is incident on it. Electrons are emitted from the surface of sodium.
Reason(R): Energy of photo-electrons in greater than the work function of sodium.

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): When a body is projected with velocity v = v0 (where v0 is orbital velocity) then path of the projectile is circular.
Reason(R): Gravitational force between body and the earth provides the centripetal force.

Solution:
QUESTION: 36

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The saturation current increases as the intensity of light increases.
Reason(R): The number of electrons emitted increases.

Solution:
QUESTION: 37

In the following question, a Statement-1 is given followed by a corresponding Statement-2 just below it. Read the statements carefully and mark the correct answer-
Statement-1:
For an observer looking out through the window of a fast moving train, the nearby objects appear to move in the opposite direction to the train, while the distant objects appear to be stationary.
Statement-2:
If the observer and the object are moving at velocities and respectively with reference to a laboratory frame, the velocity of the object with respect to the observer is

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): The induced emf and current will be same in two identical loops of copper and aluminium, when rotated with same speed in some magnetic field.
Reason(R): Induced emf is proportional to rate of change of magnetic flux while induced current depends on resistance of wire.

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): The electron passing through crossed magnetic and electric field is always deflected from its path.
Reason(R): If velocity of electrons is equal to the ratio of electric and magnetic field applied then electron beam may remain undeflected.

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): Siren of mills are heard upto longer distances in rainy season as compared in summer.
Reason(R): Density of moist air is less than the density of dry air .

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):Aeroplanes having wings fly at low altitudes while jet planes fly at high altitudes.
Reason(R):At low altitudes air is dense, whereas at high altitude air is less-dense.

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): Corresponding to the resistance 4.7 X 106 5%, the order of colour coding on carbon resistors is yellow, violet,blue, gold.
Reason(R):The numbers attached to various colours are yellow -4, violet -6, blue -7 .

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):Mass of nuclear is less than the sum of the masses nucleons present in it.
Reason(R):When the nuclers to form a nucleus, some energy is liberated.

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): X-rays are used to study bone fractures due to an accident.
Reason(R): X-rays are electromagnetic waves.

Solution:

X-rays can penetrate into several metals body flesh, etc.
This penetrating power of X-ray is used to detect bone fractures. It passes quite freely through the flesh but is stopped by the bones
So it can photograph the bones inside the body on a photographich flim. Such photograph is known as radiograph. This is used to study bone faractures

QUESTION: 45

In the following question, a Statement-1 is given followed by a corresponding Statement-2 just below it. Read the statements carefully and mark the correct answer-
Statement-1:
For practical, the earth is used as a reference at zero potential in electrical circuits.
Statement-2:
The electrical potential of a sphere of radius R with charge Q uniformly distributed on the surface is given by Q 4 π ℇ 0 R

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): A charged particle moving through a point in a magnetic field does not experience a force.
Reason(R):The charged particle is moving parallel to the magnetic field .

Solution:
QUESTION: 47

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

Solution:
QUESTION: 48

The horizontal range is four times the maximum height attained by a projectile. The angle of projection is

Solution:
QUESTION: 49

Critical angle for light going from medium (i) to (ii) is θ. The speed of light in medium (i) is ν. Then speed in medium (ii) is

Solution:
QUESTION: 50

A concave mirror of focal length f (in air) is immersed in water (μ=4/3). The focal length of the mirror in water will be

Solution:
QUESTION: 51

At 0ºK, fermi level for metals

Solution:
QUESTION: 52

Suitable impurities are added to a semiconductor depending on its use. This is done to

Solution:
QUESTION: 53

4 bulbs marked 40 W, 250 V are connected in series with 250 V mains. The total power is

Solution:
QUESTION: 54

The dimensional equation for magnetic flux is

Solution:
QUESTION: 55

Which of the following pair is wrongly matched?

Solution:
QUESTION: 56

A Nicol prism can be used

Solution:
QUESTION: 57

Wave optics is based on wave theory of light put forward by Huygen and modified later by

Solution:
QUESTION: 58

A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is mv 2 r and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

Solution:

Work done by the centripetal force is zero

QUESTION: 59

In young's double slit experiment, the intensity of central maximum is I. It one slit is closed, the intensity at the same place will become

Solution:
QUESTION: 60

A ray is incident on an equilateral prism of μ = 2 such that ray inside the prism goes parallel to the base. Find angle of minimum deviation?

Solution:
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