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Physics

Physics
Sound waves cannot travel in

Hydrogen gas
Water
Vacuum
Glass

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Physics
Kirchhoff's laws are applicable to

C. circuits only
None of these
C. circuits only
C. and A.C. circuits both

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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

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

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Physics
For photoelectric effect to take place, the metal used as the cathode should have ________

Low work function
Low resistance
High melting point
Low melting point

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Physics
Which of the following principle is used to produce ''low-temperatures' ?

Joule-Kelvin effect
Thermo-electric effect
Super conductivity
Adiabatic demagnetisation

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Physics
1 Joule is Equal to

10^3 ergs
10^6 ergs
10^7 ergs
10^5 ergs

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MORE MCQ ON Physics

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