# General Science – Physics MCQs GK SSC UPSC APSC RRB Set 2

## Q.1. While choosing for a material for an electric fuse, what should be taken care of __?

1. The material should have a low melting point
2. The material should have a low resistance
3. The fuse should be connected in parallel to the main switch

Choose the correct option from the codes given below:

[A] Only 1 is correct
[B] Only 1 & 2 are correct
[C] Only 1 & 3 are correct
[D] 1, 2 & 3 are correct

Answer: B [ Only 1 & 2 are correct]

[A] ms-2
[B] ms-3
[C] Kgms-2
[D] ms-1

[A] Sound wave
[B] Seismic wave
[C] Light wave
[D] Water waves

## Q.4. What is the triple point of water?

[A] Temperature = -273.16 K, pressure= 6.11×10-6Pa
[B] Temperature = -273.16 K, pressure= 6.11×10-3 Pa
[C] Temperature = 273.16 K, pressure= 6.11×10-6 Pa
[D] Temperature = 273.16 K, pressure= 6.11×10-3 Pa

Answer: D [Temperature = 273.16 K, pressure= 6.11×10-3 Pa]

## Q.5. Which of the following diodes is mostly commonly used as a voltage regulator?

[A] LED
[B] Varactor diode
[C] Shockley diode
[D] Zener diode

1. Transmission via optical fibres is immune to electromagnetic interference
2. Optical fibres can transmit data at a faster speed in comparison to metals

Select the correct option from the codes given below:

[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2

Answer: C [ Both 1 & 2]

## Q.7. What is the gravitational potential energy for infinite distance?

[A] 0
[B] infinity
[C] 9.8 J
[D] None of the above

[A] Gamma
[B] Visible
[D] Ultra violet

## Q.9. What is the value of Wien’s constant?

[A] 2.9 × 10–1 m K
[B] 2.9 × 10–2 m K
[C] 2.9 × 10–3 m K
[D] 2.9 × 10–4 m K

Answer: C [2.9 × 10–3 m K]

## Q.10. Which type of semiconductor do we get when pure silicon is doped with a group-3 element?

[A] n-type semiconductor
[B] p-type semiconductor
[C] Intrinsic semiconductor
[D] None

## Q.11. All metals are good conductors of heat. What could be the reason(s) behind this?

1.The molecules in them collide very freely
2.They contain free electrons
3.The molecules in them are very close to each other

Choose the correct option from the codes given below:

[A] Only 1 & 2
[B] Only 2 & 3
[C] Only 1 & 3
[D] 1, 2 & 3

Answer: B [ Only 2 & 3]

## Q.12. The acceleration due to gravity on any planet does not depend on which of the following?

[B] Mass of the planet
[C] Density of the planet
[D] Mass of the object

Answer: D [Mass of the object]

## Q.13. What is the relationship between the frequency and the pitch of a sound wave?

[A] Higher the frequency, higher the pitch
[B] Lower the frequency, higher the pitch
[C] Pitch is not dependant on the frequency
[D] None of the above

Answer: A [Higher the frequency, higher the pitch]

## Q.14. Which of the following is the mirror formula?

[A] v + u =f
[B] 1/v + 1/u = 1/f
[C] 1/v + 1/u = f
[D] None of the above

Answer: B [1/v + 1/u = 1/f]

[A] Phosphorus
[B] Arsenic
[C] Antimony
[D] Indium

## Q.16. The magnetic lines of force:

1. are closed continuous curves
2. travel from north to south outside the magnet and from south to north inside the magnet
3. bend along the length of magnet
4. mutually repel each other
5. never intersect each other

Which among the above is / are correct?

[A] Only 1 & 2
[B] Only 1, 2 & 3
[C] Only 1, 2, 3 & 5
[D] 1, 2, 3, 4 & 5

Answer: D [ 1, 2, 3, 4 & 5]

## Q.17. What is the unit of Stress?

[A] N/m
[B] Kg/m
[C] Nm
[D] It has no units

## Q.18. What is the effect on apparent frequency when the distance between the source of the sound and listener is decreased?

[A] it increases
[B] it decreases
[C] it remains same
[D] None of the above

## Q.19. What do we call the long-sightedness caused by loss of elasticity of the lens of the eye?

[A] Myopia
[B] Presbyopia
[C] Hypermetropia
[D] None

## Q.20. What are the majority charge carriers in p-type semiconductors?

[A] electrons
[B] holes
[C] equal concentration of holes and electrons
[D] None of the above

## Q.21. Who among the following is credited for the discovery of ‘Expanding Universe’?

[A] Edwin Hubble
[B] Niels Bohr
[C] S Chandra Shekhar
[D] C.V Raman

[A] Tangential
[B] Linear
[C] Lateral
[D] Longitudinal

## Q.23. In which of the following cases Doppler effect is not seen?

[A] When the velocity of source and listener is equal to or greater than the sound velocity
[B] When source and listener moves in opposite direction
[C] When the velocity of source and listener is less than the sound velocity
[D] None of the above

Answer: A [When the velocity of source and listener is equal to or greater than the sound velocity]

## Q.24. What of the following represents linear magnification?

[A] ratio of the height of the image to the height of the object
[B] ratio of the height of the object to the height of the image
[C] product of the height of the object to the height of the image
[D] difference of the height of the image to the height of the object

Answer: A [ratio of the height of the image to the height of the object]

[A] 0.3 V
[B] 0.7 V
[C] 1 V
[D] 1.7 V