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Physics

Physics
Period of oscillation of 3 cm microwaves in seconds is

1 × 10–10
1 × 1010
0.01
0.001

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Physics
The point where total mass of a body is supposed to be concentrated is known as

Centre of gravity
Centre of motion
Centre of mass
Dead centre

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Physics
Which of the following circuit elements is used to ''block" DC in an electronic circuit ?

Diode
Inductance
Resistances
Capacitance

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Physics
The sky appears blue due to

Rayleigh scattering
Mie scattering
Back scattering
None of these

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Physics
Sound of frequency below 20 Hz is called

ultrasonic
supersonics
infrasonic
audio sounds

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Physics
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Water, iron and air
Air, water and iron
Iron, air and water
Iron, water and air

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