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Physics

Physics
The atmospheric layer reflecting radio waves is called

Ozonosphere
Stratosphere
Mesosphere
Ionosphere

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Physics
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

2000
80
40
4000

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Physics
Quality of a musical note depends on

Amplitude of the wave
Harmonics present
Velocity of sound in the medium
Fundamental frequency

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Physics
A fresh egg when placed in salt water will

Float
Burst
Sink but will not go to the bottom
Sink and go to the bottom

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Physics
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

1.8 km, 0.15 km
2.2 km, 0.20 km
3.3 km, 0.30 km
2.8 km, 0.25 km

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Physics
Stars appears to move from east to west because

The earth rotates from east to west
All stars move from east to west
The background of the stars moves from west to east
The earth rotates from west to east

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