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Physics

Physics
1 m/s equals ________ km/hr

43967
16/5
18/5
43969

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Physics
What will happen if an object is dropped from a height and there is no air resistance?

Both speed and acceleration will increase
Its acceleration will increase
It will fall with a constant speed and acceleration
Its speed will increase

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Physics
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

80
4000
2000
40

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Physics
For which of the following substances, the resistance decreases with increase in temperature?

Copper
Platinum
Pure silicon
Nichrome

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Physics
Rainbow is seen after rain because of hanging molecules of water which act as

Lenses
Slabs
Mirrors
Prisms

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Physics
Transformer is a device to convert

Low voltage D.C. into high voltage D.C.
C. to A.C.
Low voltage A.C. into high voltage A.C.
Mechanical energy into Electrical energy

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