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Physics

Physics
In the atmosphere ultraviolet rays are absorbed by

Oxygen
Helium
Nitrogen
Ozone

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Physics
Momentum is measured as the product of :

Mass and force
Mass and inertia
Mass and acceleration
Mass and velocity

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Physics
During hot weather, the fan produces a feeling of comfort. This is because

Fan supplies cool air
Our perspiration eva-porates rapidly
Conductivity of air increases
Fan cools the air

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Physics
When a bullet is fired from a gun

The gun jumps up
The gun does not move
The gun moves forward
The gun recoils with the same momentum as the bullet

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Physics
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

Disk
Sphere
Depends on their masses
Both reach at the same time

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Physics
What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

24
50
12
36

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