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Physics

Physics
Soap bubble attains spherical shape due to ________

Viscosity
Surface tension
Inertia
Pressure

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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
5R/4
3R/4
R/2

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Physics
The force which makes a vehicle to stop when break is applied is called

Vanderwalls force
Covalant force
Frictional force
Gravitational force

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Physics
X–rays are

Neutral particles
None of these
Negatively charged particles
Positively charged particles

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Physics
The alluminating powers of two sources are compared by

A polarimeter
A spectrometer
A fluxmeter
A photometer

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Physics
Which one of the following wavelengths of light is most effective in photosynthesis ?

Green
Blue
Orange
Yellow

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