Top 1000+ Solved Physics MCQ Questions Answer
Q. Energy in reflected light :
a. does not depends on the angle of incidence
b. increases with the increase in angle
c. decreases with the increase in angle of incidence
d. becomes maximum for angle of incidence equal to 45°
Q. A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is –
a. the same in both cases in all respects
b. of higher intensity when train arrives
c. of higher pitch when train arrives
d. of higher pitch when train departs
Q. A dynamo is a device which –
a. creates mechanical energy
b. creates electrical energy
c. converts mechanical energy into electrical energy
d. converts electrical energy into mechanical energy
Q. A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously?
a. They must have the same volume
b. They must have the same density
c. They must have the same mass
d. They must be dropped in vacuum
Q. Woollen cloth protects the body from cold because –
a. it is a good conductor of heat
b. it is a poor conductor of heat
c. external heat rays enter into the body through the woollen cloth
d. it reflects heat
Q. The threshold frequency is the frequency below which -
a. photo current is constant
b. photo current increases with voltage
c. photo current decreases with volt
d. photo electric emission is not possible
Q. Oil rises up the wick in a lamp because
a. Oil is very light
b. Of the diffusion of oil through the wick
c. Of the surface tension phenomenon
d. Of the capillary action phenomenon
Q. The velocity of sound in moist air is more than in dry air because the moist air has
a. less density than city air
b. less pressure than dry air
c. more pressure than dry air
d. more density than dry air
Q. The owl can see most clearly in total darkness because –
a. it has squint eyes
b. it has large eyes with orbs directed forward, giving it binocular sight
c. it has light bulbs in its eyes provided by nature
d. it produces infrasonic sounds
Q. Water boils at a lower temperature on the hills because –
a. it is cold on the hills
b. there is less carbon dioxide on the hills
c. there is a decrease in air pressure on the hills
d. There is less oxygen
Q. Bats can sense obstacles because they produce –
a. supersonic sound waves
b. ultrasonic sound waves
c. infrasonic sound waves
d. micro sound waves
Q. A satellite in vacuum -
a. is kept in orbit by remote control
b. is kept in orbit by retro-rocket
c. derives energy from gravitational fielod
d. does not require any energy for orbiting
Q. The sky appears blue because –
a. All colours interfere to produce blue
b. In white light, the blue component dominates
c. The atmosphere scatters blue colour more than the others
d. It is actually blue
Q. Mercury is commonly used as a thermometric fluid rather than water because
a. specific heat of mercury is less than water
b. specific heat of mercury is more than water
c. mercury has greater visibility than water
d. density of mercury is more than the water
Q. A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.
a. The mercury level starts rising
b. The mercury level starts falling
c. The mercury level does not change
d. The bell jar breaks up