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Physics

Physics
The S.I. unit of electric charge is :

E.s.u
Kelvin
Coulomb
Ampere

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

R/5
5 R
4 R/5
5 R/4

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Physics
In electronics what comes under tank circuit ?

Resistance and inductance
Resistance, capacity and inductance
Capacity and inductance
Resistance and capacity

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Physics
The speed of light in air is

8 × 103 m/s
Infinity
3 × 10–8 m/s
3 × 108 m/s

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Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

They use less oxygen
Their lungs are very large
They have extra air sacs
They fly inactively

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Physics
Instrument used to measure the force and velocity of the wind is

Ammeter
Altimeter
Anemometer
Audiometer

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