Physics

The S.I.unit of energy is______

1 joule=

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When we rub our hands

• Kinetic energy changes into potential energy

• Potential energy changes into kinetic energy

• Mechanical energy changes into heat energy

• Heat energy changes into mechanical energy

Write the transformation of energy in cooking gas LPG

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What is the speed of light in air or vacuum

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_______Image cannot be obtained on a screen

A plane mirror _______ reflect 100% light falling on it

The angle of incidence on a plane mirror is 30° the angle between the incident ray and reflected ray is

• 30°

• 15°

• 60°

• 90°

No medium is required for the transfer of heat by the process of____

In the process of convection heat travels

• Sideways

• In all directions

• Downwards

• Upwards