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Physics

Physics
Sound of frequency below 20 Hz is called

infrasonic
ultrasonic
audio sounds
supersonics

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Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

< P
> P
2P
P

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Physics
After removing two electrons from helium atom it become?

Alpha particle
UV rays
Gama particle
X rays

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Physics
Negative acceleration is in the opposite direction of:

Force
Momentum
Distance
Velocity

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Physics
Good conductor of electricity is

Kerosene
Graphite
Dry air
Paper

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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
C1pa = C2pg
C2>C1

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