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Physics

Physics
What is the minimum distance (in metres) required to hear an echo?

10
13
21
17

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Physics
Sound travels fastest in

Water
Vacuum
Glass
Air

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Physics
1 m/s equals ________ km/hr

43969
16/5
18/5
43967

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Physics
To measure the speed of an approaching car a police officer shines

Radio waves on it
Ultra high frequency waves on it
Light waves on it
Microwaves on it

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

2R
R/2
3R/4
5R/4

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Physics
In which of the following cases, kinetic energy is being used in performing work ?

Wind mill grinding wheat grain
Driving a car to cover a distance
Rowing a boat in the lake
Paddling the bicycle to cover a distance

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