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Physics

Physics
Which of the following cannot be used for making lenses?

Glass
Plastic
Soil
Water

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Physics
Which of the following are methods of heat transfer?

Evaporation
Revolution
Convection
Thermal Expansion

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Physics
A body is initially moving with a velocity of 5 m/s. It undergoes an acceleration of 2 m/s2 for 4 seconds. Find the displacement (in m) of this body in these 4 seconds.

72
8
36
4

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Physics
The phenomenon which causes mirage is

Diffraction
Total internal reflection
Interference
Polarisation

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Physics
If lift is going up with acceleration, the apparent weight of a body is

Less than the true weight
Equal to the true weight
More than the true weight
May be more or less than true weight

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Physics
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

0.12638888888889
0.21111111111111
0.12777777777778
0.20902777777778

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