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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

22km
1100m
3.33 km
20km


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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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Multiple numbers of electrical appliances should not be connectted to the same power socket because

it can damage appliance due to overloading
it can damage domestic wiring
it can damage the socket
appliance will not get full voltage


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Who discovered Natural radioactivity ?

Marie curie
Enrico Fermi
Ernest rutherford
Henri Becquerel


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Light year is a unit to measure

Length
Distance
Depth
Width


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It is more difficult to walk on a sandy road because

Sand is soft
Friction is less
Friction is more than normal
sand is grainy


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Point X is at a lower electrical potential than point Y. An electron between them on the line joining them will

remain at rest
move at right angles
move towards A
move towards B


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Sound of frequency below 20 Hz is called

audio
infrasonic
supersonics
ultrasonic


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Some inpurities are added to a semiconductor in order to

increase its resistivity
enable it to withstand higher voltages
increase its electrical conductivity
increase its life


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Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at low temperature
conduct electricity at high temperatures
offer no resistance to the flow of electricity


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