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Physics

Physics
In a nuclear reactor, one of the following is used as a fuel.

Uranium
Radium
Diesel
Coal

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Physics
Air pressure is usually highest when the air is

Warm and dry
Warm and moist
Cool and moist
Cool and dry

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Physics
A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

C1 = C2
C1>C2
C2>C1
C1pa = C2pg

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Physics
Which of the following is the fastest communication channel?

Radio wave
Microwave
Optical fiber
All are operating at nearly the same propagation speed

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Physics
As we go from Equator to North pole the value of ''g', the acceleration due to gravity

None of these
Decreases
Increases
Remains the same

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Physics
Convex mirrors are used as a rear view mirror in motor cycles because

It forms erect (upright) image
All of these
It forms real image
It forms smaller image as compared with object

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