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Physics

Physics
The least penetrating power ray is

None of these
Alpha rays
Gamma rays
Beta rays

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Physics
Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

K1k2/k1+k2
None
K1+k2/k1k2
2k1k2/k1+k2

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Physics
The sky appears blue because of

Reflection on sea water
Scattering of light
Emision of blue wavelength by the sun
Atmospheric water vapour

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Physics
What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

35 km/sec
21 km/sec
18 km/sec
11.2 km/sec

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Physics
The word "Physics" comes from the Greek word

Phiji
Phusik
None of these
Fusis

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Physics
A rear-view mirror for driving is

Inverted
Convex
Plain
Concave

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