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it is easier to roll a stone up a sloping road than to lift it because

work done in rolling a stone is less than in lifting it
work done in both is same but the rate of doing work is less in rolling
work done in lifting the stone is equal to rolling it
work done in rolling is more than in lifting


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Suppose the rain is falling vertically, from which direction does it appear to be coming from if the person is running east-wards?

east
west
northwest
southwest


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One nanometer is equal to

10-6m
10-9m
10-8m
10-5m


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Which of the following phenomena is responsible for making a rainbow?

Refraction
Internal reflection
Bath A & B
None of the above


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Solar eclipse forms when

The sun is between The moon and The earth
The earth is between The sun and The moon
The moon is between The sun and The earth
Mercury comes between The sun and The earth


This can happen only at new moon, when the Sun and the Moon are in conjunction as seen from Earth in an alignment referred to as syzygy. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses only part of the Sun is obscured.

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One watt-hour is equivalent to

6.3 x 103 J
3.6 x 10-3 J
6.3 x 10-7 J
3.6 x 103 J


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Light year is a unit to measure

Length
Distance
Depth
Width


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Rectifiers are used to convert

Alternating current to Direct current
low voltage to high voltage
Direct current to Alternating current
high voltage to low voltage


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Sound of frequency below 20 Hz is called

audio
infrasonic
supersonics
ultrasonic


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When flying aeroplane at a high altitude

the pressure remains same
the pressure decreases
normal atmospheric pressure is maintained
normal humidity is maintained


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