General Knowledge - Physics

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"Weakness of attitude becomes weakness of character."

- Albert Einstein

73.

One nanometer is equal to

A.	10^-6m	B.	10^-8m
C.	10^-9m	D.	10^-5m

74.

Mica is used in electrical appliances such as electric iron because mica is

A.	a good conductor of heat but a bad conductor of electricity
B.	a bad conductor of heat but a good conductor of electricity
C.	a good conductor of heat as well as electricity
D.	a bad conductor of heat as well as electricity

75.

It is easier to roll a barrel full of coal tar than to pull it because

A.	the full weight of the barrel comes into play when it is pulled
B.	the rolling friction is much less than the sliding friction
C.	more surface area of the barrel is in contact with the road when it is pulled
D.	coal tar is a liquid and it flows in the barrel when it is rolled

76.

Minimum number of unequal vectors which can give zero resultant are

A.	two	B.	three
C.	four	D.	more than four

77.

Intensity of sound has

A.	an object existence
B.	a subject existence
C.	no existence
D.	both subjective and objective existence

78.

Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

A.	east	B.	west
C.	northeast	D.	southeast