Physics
In an optical fibre the signal is transmitted

Due to total internal reflection
In a straight line path
In a curved path
Due to refraction

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Physics
A dynamo is used to convert

Mechanical energy into electrical energy
Magnetic energy into mechanical energy
Electrical energy into mechanical energy
Electrical energy into magnetic energy

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the sun is between the moon and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth

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Physics
Purpose of an optical filter is to

Reflect lights of different colours
Transmit or absorb light of different colours
Refract light of different colours
Dispense light into component colours

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