Class X

Melting is change of state
1. From solid to liquid with change in temperature of 25 °C
2. From liquid to gas with change in temperature of 75 °C
3. From liquid to gas without change in temperature
4. From solid to liquid without change in temperature
Increase rate of evaporation
1. Decrease rate of evaporation
2. Not affect rate of evaporation
3. Disturb rate of evaporation
4. Increase rate of evaporation
A bus travels with a constant force of 5000 N and work done by bus is 2500 J, distance travelled by bus is
1. 2 m
2. 0.5 m
3. 7500 m
4. 2500 m
Provided that latent heat of fusion of a 5.4 kg block of ice has been provided by a heater of 1 kW for 1800 s, specific latent heat of fusion of ice would then be equal to
1. 333 kJ ⁄ kg
2. 340 kJ ⁄ kg
3. 350 kJ ⁄ kg
4. 360 kJ ⁄ kg
A car covers a distance of 5 km in 5 mins, its average speed is equal to
1. 1 km ⁄ h
2. 25 km ⁄ h
3. 60 km ⁄ h
4. None of above
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