### Class X

Work done must have same unit as
1. Force
2. Power
3. Energy
4. Efficiency
Specific latent heat of vaporization is
1. Amount of heat required to raise temperature of a 1 kg of a substance by 1 K
2. Amount of heat required to change phase of a substance from liquid to gas without any change in temperature
3. Amount of heat required to change phase of a 1 kg of substance from solid to liquid without any change in temperature
4. Amount of heat required to change phase of a 1 kg of substance from liquid to gas without any change in temperature
Liquids are
1. Very compressible
2. Very little compressible
3. Incompressible
4. B and C both
A car uses total energy of 2500 J and output is 750 J. efficiency of car is
1. 50%
2. 30%
3. 25%
4. 80%
Air trapped inside a single-piston-cylinder exerts a pressure of 760 mmHg. If its volume is increased by 30% at a constant temperature, pressure exerted would be equal to
1. 533 mmHg
2. 544 mmHg
3. 584 mmHg
4. 633 mmHg
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