9th Physics Chapter6 Work and Energy
| Sr # | Questions | A | B | C | D |
|---|---|---|---|---|---|
| 1 | 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 | 2 | In Einstein,s mass energy equation, c is the | speed of sound | speed of light | speed of electron | speed of Earth | 3 | 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. | 4 | The energy stored in coal is | heat energy | kinetic energy | chemical energy | nuclear energy | 5 | Which of the following energy types is associated with the position of an object? | Kinetic energy | Gravitational potential energy | Mechanical energy | Thermal energy | 6 | 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. | 7 | Which one of the following device converts light energy into electrical energy: | Electric bulb | Electric generator | Photo-cell | Electric cell | 8 | 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 | 9 | In Einstein’s mass-energy equation, C is the: | Speed of sound | Speed of light | Speed of earth | Speed of electron | 10 | Which of the following is a non-conservative force? | Friction | Gravity | Spring force | Tension | 11 | 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 | 12 | Rate of doing work is called | energy | torque | power | momentum |