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Physics

Physics
Mach number is used in connection with the speed of

spacecraft
sound
ships
aircraft

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Physics
Nuclear reactors used to produce electricity are based on

Nuclear fusion
Nuclear fission
Superconductivity
Cold fusion

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Physics
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?

Dacrease
Remain constant
Will increase first and then dcrease
Increase

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Physics
If lift is going up with acceleration, the apparent weight of a body is

More than the true weight
May be more or less than true weight
Less than the true weight
Equal to the true weight

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Physics
Rear view mirror of car is convex or concave?

Both A & B
Concave
Convex
Can't be determined

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Physics
An electron and a proton starting from rest get accelerated through potential difference of 100 kV. The final speed of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?

Ve < Vp
Cannot be determined
Ve > Vp
Ve = Vp

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