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Physics

Physics
When the barometer reading dips suddenly, it is an indication of

Dry weather
Storm
Calm weather
Hot weather

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Physics
In a refrigerator what produces the cooling ?

None of these
The ice which deposits on the freezer
The evaporation of a volatile liquid
The sudden expansion of a compressed gas

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Physics
Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be

P/3
3P
P
2p/ 3

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Physics
Which of the following has the shortest wavelength?

Gamma rays
Radio waves
Infrared rays
Microwaves

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Physics
The hydraulic brakes used in automobiles is a direct application of :

Archimedes' principle
Bernoulli's theorem
Pascal's law
Toricellian law

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Physics
A gap is left between two rails of a railway track to accommodate...... of the metal.

Areal expansion
Linear expansion
Apparent expansion
Volume expansion

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