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Physics

Physics
An object that has kinetic energy must be

Moving
Falling
At rest
At an elevated position

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Physics
Radio activity is due to

Unstable nucleus
Stable electronic configu-ration
Stable nucleus
Stable electronic configu-ration

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Physics
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

20 cm
5 cm
15 cm
10 cm

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Physics
Man perceives sound vibrations in the frequency ranges of

20 – 20000 Hz
6 – 10 Hz
0 – 5 Hz
11 – 20 Hz

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Physics
The wavelength of a wave is the distance between

Crest and Trough
Both B & C
Trough and Trough
Crest and Crest

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Physics
The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

Newton's third law of motion
Bernoulli's principle
Earth's gravitational force
Magnetic properties of the ship's material

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