Friction and its Effects Quiz Questions and Answers PDF - 85

MCQ 421: A truck engine having mass of 4000 kg is pulling a lorry of mass 1000 kg along a level of path at an acceleration of 0.25 ms^-2. The resistances are 8 N per 1000 kg for the truck engine and 10 N per 1000 kg for the lorry. What is the forward thrust exerted by the engine?

1. 1292 N
2. 1300 N
3. 1350 N
4. 1450 N

MCQ 422: The energy stored in fossil fuels like coal and oil is

1. mechanical energy
2. heat energy
3. kinetic energy
4. chemical potential energy

MCQ 423: If an electric heating coil supplies 60 W of power to a block of metal having mass of 0.5 kg and then raises the temperature of the block from 30 °C to 60 °C in 50 s. What is the specific heat capacity of the metal?

1. 20 J Kg^{-1 -1}
2. 200 J Kg^{-1 -1}
3. 300 J Kg^{-1 -1}
4. 500 J Kg^{-1 -1}

MCQ 424: The process of evaporation as compared to boiling is

1. same
2. quick
3. slow
4. 2 times fast

MCQ 425: 100 g of water requires 13800 J of thermal energy to raise it from 20 °C TO 40°C. What is the heat capacity of 100 g of water?

1. 690 J K^-1
2. 69 J K^-1
3. 6900 J K^-1
4. 69000 J K^-1