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# AFMC Physics Mock Test - 3

## 50 Questions MCQ Test AFMC Mock Test Series 2021 | AFMC Physics Mock Test - 3

Description
This mock test of AFMC Physics Mock Test - 3 for NEET helps you for every NEET entrance exam. This contains 50 Multiple Choice Questions for NEET AFMC Physics Mock Test - 3 (mcq) to study with solutions a complete question bank. The solved questions answers in this AFMC Physics Mock Test - 3 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AFMC Physics Mock Test - 3 exercise for a better result in the exam. You can find other AFMC Physics Mock Test - 3 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### An unknown resistance K₁ is connected in series with a resistance of 10 Ω. This combination is connected to one gap of a metre bridge, while a resistance K₂ is connected in the other gap. The balance point is at 50 cm. Now when the 10 Ω resistance is removed, the balance point shifts to 40 cm. The value of K₁ is

Solution:
QUESTION: 4

Consider the two following statements A and B and identify the correct choice given in the answers; (A) In photovoltaic cells the photoelectric current produced is not proportional to the, intensity of incident light. (B) in gas filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.

Solution:
QUESTION: 5

Which of the following does not obey the phenomenon of mutual induction?

Solution:
QUESTION: 6

If 2.2 kW power is transmitted through a 10 Ω line at 22000 V, the power loss in the form of heat will be

Solution:
QUESTION: 7

Compare electrons accelerated through a certain potential difference and protons accelerated through the same p.d. If initial velocities are negligible, then the emergent

Solution:
QUESTION: 8

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Solution:
QUESTION: 9

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is

Solution:
QUESTION: 10

A uniform wire of 16Ω resistance is made into the form of a square. Two opposite corners of the square are connected by a wire of resistance 16Ω. The effective resistance between the other two opposite corners is

Solution: The resistance of the wires along the sides are 4 Ω each and the diagonal is 16 Ω
Then the above circuit satisfies the Wheatstone's balanced condition
Hence there is no current passing the resistance AC when a potential is applied between B and D
On removing the resistance AC, resistance DA and AB are series, similarly DC and CB are in series and the respective two are in parallel
Then the resistance across D - A - B = 4 + 4 = 8 Ω
Resistance across D - C - B = 4 + 4 = 8 Ω
Now both the 8 Ω are in parallel
Hence the effective resistance of the circuit is = 4 Ω

QUESTION: 11

If 4 x 1020 eV of energy is required to move a charge of 0.25 coluomb between two points, the P.D. between them is

Solution:

E = 4× 1020 eV = 64 J

{ since 1eV = 1.6 × 10-19 J,

4 × 1020 eV = 4 × 1020 × 1.6 ×10-19 J = 6.4 × 10 = 64 J }

charge = 0.25 C

potential difference = work / charge = 64 / 0.25 = 256V.

QUESTION: 12

The value of g on the earth's surface is 980 cm/sec2. Its value at a height of 64 km from the earth's surface is

Solution:
QUESTION: 13

A black body, at a temprature of 227°C, radiates heat at a rate of 20 cal m⁻2s⁻1. When its temperature is raised to 727° the heat radiated by it in cal m⁻2s⁻1 will be closest to

Solution:
QUESTION: 14

Capacitance of a capacitor becomes 7/6 times its original value if a dielectric slab of thickness, t = 2/3 d is introduced in between the plates. 'd' is the separation between the plates. The dielectric constant of the dielectric slab is

Solution:  QUESTION: 15

At OK which of the following properties of a gas will be zero

Solution:
QUESTION: 16

A gas at certain temperature and volume has a pressure equal to 75 cm of Hg. If the mass of the gas is doubled, at the same volume and same temperature, its new pressure will be

Solution:
QUESTION: 17

A marble block of mass 2 kg lying on ice when given a velocity of 6 m−s⁻1 is stopped by friction in 10 s. Then the coefficient of friction is (Take g = 10 m−s⁻2)

Solution:
QUESTION: 18

300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Taking g = 10 m/s2, work done against friction is

Solution:
QUESTION: 19

The coil in the tangent galvanometer must be kept

Solution:
QUESTION: 20

A capillary tube of radius r is immersed in water and water rise in it to a height h. Mass of water in capillary tube is m. If the radius of the tube is doubled, the mass of water that will rise in capillary will be

Solution:
QUESTION: 21

The force of cohesion is maximum in

Solution:
QUESTION: 22

A capillary tube when immersed vertically in a liquid records a rise of 3 mm. If the tube is immersed in the liquid at an angle of 60” with the vertical, then height of the liquid in the capillary tube will be

Solution:
QUESTION: 23

Two water pipes P and Q having diameters 2 cm and 4 cm respectively are joined in series with the main supply line of water. The velocity of water flowering in pipe P is

Solution:
QUESTION: 24

A spherical drop of water has 1 mm radius. If the surface tension of water is 70x10⁻3 N-m⁻1, then difference of pressures between inside and outside of spherical drop is

Solution:
QUESTION: 25

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

Solution:

Speed of sound in a stretched string v = Where T is the tension in the string and μ is mass per unit length
According to Hooke's law, F ∝ x
∴ T ∝ x .....(ii) QUESTION: 26

Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v. The retarding viscous force acting on the spherical ball is:

Solution:
QUESTION: 27

A wire fixed at the upper end, stretches by length l by applying a force F. Work done in stretching done the wire is

Solution: If the wire is increased by infinite small length dl, then the work done is QUESTION: 28

The path of a particle moving under the influence of a force fixed in magnitude and direction is

Solution:
QUESTION: 29

A body is whirled in a horizontal circle of radius 20 cm. It has angular velocity of 10 rad/s. What is its linear velocity at any point on circular path

Solution:
QUESTION: 30

The magnifying power of a telescope is 'm'. If the focal length of the objective is doubled, then its magnifying power will become

Solution: QUESTION: 31

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170 s. The frequency of the wave is

Solution:
QUESTION: 32

In which of the following case, man will not see image greater than himself ?

Solution:
QUESTION: 33

A lens is placed between a source of light and a wall. It forms images of area A₁ and A₂ on the wall, for its two different positions. The area of the source obtained is

Solution:
QUESTION: 34

Single from a remote control to the device operated by it travels with the speed of

Solution:
QUESTION: 35

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is

Solution:
QUESTION: 36

A wheel rotates with a constant acceleration of 2.0 radian/sec2. If the wheel starts from rest the number of revolutions it makes in the first ten seconds will be approximately

Solution:
QUESTION: 37

Let F̅ be the force acting on a particle, having position vector r̅,and T̅ be the torque of this force about the origin, then

Solution:
QUESTION: 38

A body A of mass M while falling vertically downwards under gravity breaks into two parts, a part B of mass M/3 and body C of mass 2M/3. The centre of mass of the bodies B and C taken together

Solution:

No horizontal external force is acting
∴ acm = 0
since vcm = 0
∴ Δxcm = 0

QUESTION: 39

A cylindrical solid of mass M has radius R and length L. Its moment of inertia about a generator is

Solution:
QUESTION: 40

The acceleration of a particle in S.H.M. is

Solution:
QUESTION: 41

A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be

Solution:
QUESTION: 42

One calorie is defined as the amount of heat required to raise the temperature of 1 g of water by 1°C under temperature range at a particular pressure. The correct temperature range and pressure are

Solution:
QUESTION: 43

One second is equal to

Solution:
QUESTION: 44

The S.I. unit of gravitational potential is

Solution:
QUESTION: 45

Chronometer is used to measure

Solution:
QUESTION: 46

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

Solution:
QUESTION: 47

Bubble's of colourless soap solution appear coloured in sun light. This is due to

Solution:
QUESTION: 48

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

Solution:
QUESTION: 49

A tuning fork when sounded along with a standard source of frequency 300 Hz produces 5 beats/sec. The tuning fork when loaded by some wax is again found to give 5 beats/sec with the standard source. The frequency of the fork originally is

Solution:
QUESTION: 50

The kinetic energy of a body is four times it momentum. Its velocity is

Solution: