General Knowledge - Physics

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Exercise

Section 1

"We cannot solve our problems with the same thinking we used when we created them."

- Albert Einstein

43.

Light travels at the fastest speed in

A.	glass	B.	water
C.	hydrogen	D.	vacuum

44.

Railway tracks are banked on curves

A.	necessary centrifugal force may be obtained from the horizontal component weight of the train
B.	to avoid frictional force between the tracks and wheels
C.	necessary centripetal force may be obtained from the horizontal component of the weight of the train
D.	the train may not fly off in the opposite direction

45.

On a cold day when a room temperature is 15^oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15^oC, because

A.	metals have higher thermal capacity than plastics
B.	plastics have a lower density than metals
C.	metals are good conductor of heat
D.	plastics have a higher thermal conductivity than metals

46.

Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

A.	1.8 km, 0.15 km
B.	2.2 km, 0.20 km
C.	2.8 km, 0.25 km
D.	3.3 km, 0.30 km

47.

Intensity of sound at a point is ____ its distance from the source.

A.	directly proportional to
B.	inversely proportional to
C.	directly proportional to square of
D.	inversely proportional to square of

48.

Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

A.	at sea level
B.	at the top of Mt. Everest
C.	at a place in a valley below sea level
D.	in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level