# [Set-4] Physics MCQ for Competitive Exams

`MCQ-1` Which among the following gases does not help in the depletion of ozone in the ozone layer?

A) NO
B) NO2
C) CFC
D) CO2

D) CO2

`MCQ-2` Which among the following substances has the highest heat conductivity?

A) Silver
B) Diamond
C) Copper
D) Aluminium

B) Diamond

`MCQ-3` Let violet and red light has same incident angle on prism and r and v are the angle of refraction from the prism respectively. Which relation among the following is correct?

A) r = v
B) r > v
C) r < v
D) r = 1/v

r < v

`MCQ-4` Coulomb’s law is applicable when of the two charges

A) one is point, one is spherical
B) both are spherical
C) one is point, one is extended
D) both are points

D) both are points

`MCQ-5` The characteristics of a fuse wire are

A) high resistance, high melting point
B) low resistance, low melting point
C) low resistance, high melting point
D) high resistance, low melting point

high resistance, and low melting point.

`MCQ-6` Present in alpha particle

A) one proton, one neutron
B) one proton
C) two proton, two neutron
D) one electron

C) two proton, two neutron

`MCQ-7` Which of the following is not a periodic property of elements?

A) density
B) boiling point
C) melting point

`MCQ-8` Choose whether the following statement is true or false:
StateMent: Among copper, invar and iron the linear expansion coefficient of iron is the lowest.

A) True
B) False

False: invar has the lowest expansion coefficient

`MCQ-9` Which kind of nuclear reaction produces energy in a nuclear reactor?

A) Fission
B) Fusion
C) Both
D) None

A) Fission

`MCQ-10` Where in the front of a concave mirror image of an extended object placed at infinity will be formed by the mirror?

A) at focus
B) between focus and pole
C) at double the focus
D) at infinity