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Physics

Physics
Which one of the following is an ohmic conductor?

Silicon
Carbon
Silver
Germanium

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Physics
The threshold frequency is the frequency below which :

Photo electric emission is not possible
Photo current decreases with voltage
Photo current is constant
Photo current increases with voltage

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Physics
Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?

4.33 diopters
-4.33 diopters
12.33 diopters
-12.33 diopters

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Physics
Night photography and photopraphy in mist and fog are possible using

Gamma radiation
Microwave radiation
Ultra-violet radiation
Infra-red radiation

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Physics
Purity of a metal can be determined with the help of

Pascal's law
Archimedes principle
Conservation of mass principle
Boyle's law

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Physics
At what temperature do the Fahrenheit and Celsius scales give the same reading?

212 degrees
32 degreees
0 degreees
-40 degreees

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