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Physics

Physics
Which colour has the highest frequency?

Green
Red
Indigo
Violet

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Physics
The light rays used for eliminating bacteria

Infrared rays
Microwave radiation
Ultra-violet radiation
X-rays

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Physics
Sound waves cannot travel in

Water
Hydrogen gas
Glass
Vacuum

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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?

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

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Physics
When all the forces and torques are balanced in a mechanical body it is said to be in

Equilibrium
Static
Buoyancy
None of these

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Physics
An instrument that records earthquakes is

Thermograph
Seismograph
Ediograph
Ergograph

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