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