Science Physics MCQ-39

General Science-Physics online Exam NDA, CDS, UPPSC, JPSC, RBI, UPSC, SSC, CivilsPrelims Exams



Assertion: The motion of a body moving in a circle with a constant speed is accelerated.

Reason: The velocity of the body is changing with time since the direction of its velocity is continuously changing.

 
 
 
 

Assertion: The resistance of the filament of an electric bulb is higher when it is glowing than when it is not.

Reason: The resistance of a conductor increases with increase in temperature.

 
 
 
 

Assertion: The small ozone layer in the earth’s atmosphere is crucial for the survival of life on the earth.

Reason: The ozone layer absorbs the harmful ultraviolet radiation from the sun.

 
 
 
 

Assertion: The speed of sound in steel is greater than that in air.

Reason: Sound is a longitudinal wave.

 
 
 
 

Assertion: The twinkling of stars is not observed by astronauts in a spacecraft for above the earth.

Reason: There is no atmosphere in the space around the spacecraft.

 
 
 
 

The resources which can be used continuously, year-after-year are called

 
 
 
 

Water boils at a lower temperature on the hills because

 
 
 
 

Refrigerators keep food unspoiled because

 
 
 
 

The temperature which has the same reading on both Fahrenheit and Celsius scales is

 
 
 
 

If a boy sitting in a train, moving at a constant velocity, throws a ball straight up into the air

 
 
 
 

When an object is placed between the two mirrors placed parallel to each other, how many images will be formed?

 
 
 
 

‘Green house effect’ means

 
 
 
 

Clothes keep us warm in winter because they

 
 
 
 

When a person enters a dark room from bright light, he cannot see anything clearly for some time. Slowly, he starts seeing things. This is because the

 
 
 
 

Bolometer is used to measure

 
 
 
 

A soap bubble shows colours when illuminated with white light. This is due to

 
 
 
 

The instrument used to see the distant objects on the Earth is

 
 
 
 

It is difficult to cook rice

 
 
 
 

A dynamo is a device which

 
 
 
 

A person is hurt on kicking a stone due to

 
 
 
 

The fuse in our domestic electric circuit melts when there is a high rise in

 
 
 
 

Which of the following is an example for cantilever beam?

 
 
 
 

X-rays were discovered by

 
 
 
 

A perfect black body has the unique characteristic feature as

 
 
 
 

Laser is a device to produce