9th Physics Chapter6 Work and Energy
| Sr # | Questions | A | B | C | D |
|---|---|---|---|---|---|
| 1 | The energy stored in coal is | heat energy | kinetic energy | chemical energy | nuclear energy | 2 | Energy stored in a dam’s water is: | Potential energy | Kinetic energy | Thermal energy | Electrical energy | 3 | The law of conservation of energy states that: | Energy can be created but not destroyed. | Energy can be destroyed but not created. | Energy cannot be created or destroyed, only transformed from one form to another. | Energy is always decreasing over time. | 4 | The energy stored in a dam is | electric energy | potential energy | kinetic energy | thermal energy | 5 | The work done in lifting a brick of mass 2 kg through the height of 5mm above the ground will be: | 2.5 J | 10 J | 50 J | 100 J | 6 | When is work done on an object considered positive? | When the object moves in the direction of the force applied. | When the object moves opposite to the direction of the force applied. | Work is always zero | Work depends on the object's mass. | 7 | If the direction of motion of the force is perpendicular to the direction of motion of the body, then work done will be: | Maximum | Minimum | Zero | None of the above | 8 | If an object is lifted to a higher position, what happens to its gravitational potential energy? | It decreases. | It remains the same. | It increases. | It depends on the object's shape. | 9 | Which of the following is an example of kinetic energy? | A stationary car | A book on a shelf | A moving bicycle | A piece of paper | 10 | Which of the following energy types is associated with the position of an object? | Kinetic energy | Gravitational potential energy | Mechanical energy | Thermal energy | 11 | 10-joule work is done by machine in 5 seconds. Its power will be: | 2W | 10 W | 25 W | 502 W | 12 | Which of the following is a scalar quantity? | Force | Work | Velocity | Acceleration | 13 | Which one of the following device converts light energy into electrical energy: | Electric bulb | Electric generator | Photo-cell | Electric cell | 14 | The kinetic energy of a body of mass 2 kg is 25 J. Its speed is: | 5 ms-¹ | 125 ms-¹ | 25 ms-¹ | 500 ms-¹ | 15 | If the force and displacement are in the same direction, what can you say about the work done? | Work is positive | Work is negative. | Work is zero. | Work depends on the speed. | 16 | The work by which transfer of heat takes place are: | 45° | 60° | 90° | 180° | 17 | When a body is lifted through a height h, the work done on it appears in the form of its: | Kinetic energy | Potential energy | Elastic potential energy | Geothermal energy | 18 | In Einstein’s mass-energy equation, C is the: | Speed of sound | Speed of light | Speed of earth | Speed of electron | 19 | The unit of work in the International System (SI) is: | Joule (J) | Newton (N) | Watt (W) | Pascal (Pa) | 20 | Which of the following is a non-conservative force? | Friction | Gravity | Spring force | Tension | 21 | If the velocity of a body becomes double ,then its kinetic energy will | remain the same | become double | become four times | become half | 22 | What is the formula for calculating work done (W) when the force (F) and displacement (d) are in the same direction? | W = F/d | W = F * d | W = F - d | W = F + d | 23 | Rate of doing work is called | energy | torque | power | momentum | 24 | In Einstein,s mass energy equation, c is the | speed of sound | speed of light | speed of electron | speed of Earth | 25 | The rate of doing work is called: | Energy | Torque | Power | Momentum |