Physics

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

A. 1200 m

B. 0.33 km

C. 3.33 km

D. 33 km

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

Intensity of sound has

A. an object existence

B. a subject existence

C. no existence

D. both subjective and objective existence

Minimum number of unequal vectors which can give zero resultant are

A. two

B. three

C. four

D. more than four

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

One nanometer is equal to

A. 10-6m

B. 10-8m

C. 10-9m

D. 10-5m

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

Planets are

A. luminous heavenly bodies revolving around a star

B. non-luminous heavenly bodies

C. luminous heavenly bodies that twinkle

D. luminous heavenly bodies that do not twinkle

Natural radioactivity was discovered by

A. Marie Curie

B. Ernest Rutherfor

C. Henri Becquerel

D. Enrico Fermi

Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?

A. I, II and III

B. I and II

C. II and III

D. I and III

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