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Physics

Physics
1 WH =

3600 joules
36 joules
360 joules
36000 joules

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Physics
The distance between node and adjacent antinode is 30 cm. The wavelength is

30 cm.
120 cm.
60 cm.
90 cm.

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Physics
Which of the following is not caused by atmospheric refraction of light ?

Twinkling of stars at night
Sun appearing higher in the sky than it actually is
Sun appearing red at sunset
Sun becoming visible two or three minutes before actual sunrise

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Physics
Echolocation is an adaptation bats use to

Locate flowering plants
All of these
Find warm places for hibernation
Hunt insects in flight

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Physics
Flight Recorder is technically called :

Dark box
Black box
Blind box
Altitude meter

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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
2P
> P
< P

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