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Physics

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

36
24
12
50

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Physics
When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are

Waves are not produced
Transverse
Longitudinal
Both longitudinal and transverse

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Physics
Why is weightlessness experienced while orbiting the earth in space ships ?

Zero gravity
Acceleration
None of these
Inertia

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Physics
Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is :

2
1.5
1
1.2

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Physics
According to the theory of relativity, which of the following always remains constant ?

Velocity of light
Time
Length of an object
Space

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Physics
Magnetic keepers are used to protect magnets from :

Earth's magnetic field
Demagnetization due to heating
Self-demagnetization
Effect of other magnets

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