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Physics Questions Answers

Q71 :

Two bodies A and B are of same mass and same amount of heat is given to both of them. If the temperature of A increases more than that of B because of heat addition, then —

A
  

the specific heat capacity of A is more than that of B

B
  

the specific heat capacity of A is less than that of B

C
  

both A and B have the same specific heat capacity but A has greater thermal conductivity

D
  

both A and B have the same specific heat capacity but B has greater thermal conductivity

View Answer
Correct Answer: B

the specific heat capacity of A is less than that of B

No Description Available
Q72 :

A person sitting in an open car moving at constant velocity throws a ball vertically upwards in air. If effect of air resistance is neglected, the ball will fall —

A
  

exactly in the hands of the person

B
  

outside the car

C
  

in the car behind the person

D
  

in the car ahead of the person

View Answer
Correct Answer: A

exactly in the hands of the person

No Description Available
Q73 :

When a thin film of oil is spread over water at rest, coloured bands are observed. This is the result of the phenomenon of —

A
  

Dispersion

B
  

Interference

C
  

Polarisation

D
  

Scattering

View Answer
Correct Answer: B

Interference

No Description Available
Q74 :

Match List I (Type of waves) with List II (Their Application) and select the correct answer using the codes given below the Lists:

List I
(a) Matter Waves
(b) Electromagnetic Waves
(c) Elastic Waves
(d) Longitudinal Waves

List II

1. Surgery using Lasers
2. Acoustic Radar
3. Electron Microscope
4. Musical Instruments

A
  

a-3, b-1, c-4, d-2

B
  

a-1, b-3, c-4, d-2

C
  

a-3, b-1, c-2, d-4

D
  

a-1, b-3, c-2, d-4

View Answer
Correct Answer: C

a-3, b-1, c-2, d-4

No Description Available
Q75 :

Match List I with List II and select the correct answer using the codes given below the Lists:

List I (Discovery)
(a) Radioactivity
(b) Relativity
(c) Gravitation
(d) X-ray

List II (Scientist)
1. Isaac Newton
2. Wilhelm Conrad Roentgen
3. Henri Becquerel
4. Albert Einstein

A
  

a-3, b-1, c-2, d-4

B
  

a-3, b-4, c-1, d-2

C
  

a-1, b-3, c-4, d-2

D
  

a-2, b-4, c-1, d-3

View Answer
Correct Answer: B

a-3, b-4, c-1, d-2

No Description Available
Q76 :

A straight horizontal conductor carries a steady electric current from south to north. Which one of the following events would happen if a small magnetic compass is placed just above the wire? 

A
  

The needle remains perpendicular to the conductor

B
  

The needle remains parallel to the conductor

C
  

The north pole of the needle is deflected towards east

D
  

The north pole of the needle is deflected towards west

View Answer
Correct Answer: C

The north pole of the needle is deflected towards east

Description:

If a straight current carrying conductor in which electric current flowing from south to north and a compass needle placed below the wire then north-pole of the compass needle deflect towards west. It is because electric current produces magnetic field thus deflecting the needle towards west. And if the current is flowing from north to south in the same adjustment then north-pole of the needle gets deflected towards east.

Q77 :

If the angle between two plane mirrors is 60°, the number of images formed will be 

A
  

infinite

B
  

7

C
  

6

D
  

5

View Answer
Correct Answer: D

5

No Description Available
Q78 :

The core of a transformer is laminated, so that

A
  

ratio of the voltages across the secondary and primary is doubled

B
  

the weight of the transformer can be kept low

C
  

the rusting of the core is prevented

D
  

energy loss due to eddy current is minimised

View Answer
Correct Answer: D

energy loss due to eddy current is minimised

No Description Available
Q79 :

Match List I with List II and select the correct answer using the codes given below the Lists:

List I (Theory / Invention)
(a) Exclusion principle
(b) Uncertainty principle
(c) Atomic spectrum of hydrogen atom in visible region
(d) Wave mechanics

List II (Scientist)
1. Balmer
2. Heisenberg
3. Schrödinger
4. Pauli

A
  

a-1, b-4, c-2, d-3

B
  

a-2, b-4, c-3, d-1

C
  

a-4, b-1, c-2, d-3

D
  

a-4, b-2, c-1, d-3

View Answer
Correct Answer: D

a-4, b-2, c-1, d-3

No Description Available
Q80 :

Consider the following statements:
A copper voltameter measures the
1. quantity of current passing through the circuit.
2. amount of copper deposited.
3. resistance of the circuit.
Which of these statements are correct?

A
  

1, 2 and 3

B
  

1 and 2

C
  

2 and 3

D
  

1 and 3

View Answer
Correct Answer: B

1 and 2

No Description Available
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