# Physics MCQ for Competitive Exams [Set-5]

`[MCQ 1]` Metal is a conductor of electricity, because:

a) the atoms are free from the electrostatic force
b) there are free electrons present
c) high melting points
d) All of the above

b) there are free electrons present

`[MCQ 2]` How is the resistance of earth wire compared to ordinary wire?

a) both have same resistance
b) ordinary wire has low resistance than earth wire
c) EArth wire has low resistance than ordinary wire
d) can not say

b) ordinary wire has low resistance than earth wire

`[MCQ 3]` Which of the following is a scalar quantity?

a) Velocity
b) current electricity
c) Displacement
d) Area

b) Current electricity

`[MCQ 4]` Why are women’s voices sharp?

a) sound has high frequency compared to male
b) sound has low frequency compared to male
c) sound has large amplitude than male
d) sound has small amplitude than male

Amswer
a) sound has high frequency compared to male

`[MCQ 5]` Rectifier is used in which case?

[A] Ac fan
[B] Battery
[C] wall clock
[D] Mobile charger

Mobile Charger

`[MCQ 6]` What is the equation PV = RT called?

[A] Charle’s law
[B] Boyle’s law
[C] Ideal gas equation
[D] None of these

[C] Ideal gas equation

[MCQ 7] The number of molecule of 44 g of carbon dioxide is

[A] 6.023 × 1022
[B] 6.023 × 1024
[C] 6.023 × 1023
[D] 6.023 × 1021

[C] 6.023 x 1023

[MCQ 8] What is the name of the sound that has a frequency above 20 Hz called?

[A] audible sound
[B] infrasonic
[C] subsonic
[D] supersonic

[D] supersonic

[MCQ 9] Which color among the seven colors of rainbow has the smallest wavelength?

[A] Blue
[B] red
[C] green
[D] violet

[D] violet

[MCQ 10] In which medium, light can travel faster?

[A] Air
[B] Vacuum
[C] Steel
[D] Water