HARD
Lower Secondary Stage 7
IMPORTANT
Earn 100
A refrigerator works by using electrical energy to reduce the temperature inside the storage compartment. Use the principle of conservation of energy to explain why the temperature outside the refrigerator must increase.
Important Questions on Energy
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Choose the best answer from the list.
When we switch on a lamp:
MEDIUM
Lower Secondary Stage 7
IMPORTANT
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Look at the bar chart given below. Write a conclusion for the data in the chart.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
HARD
Lower Secondary Stage 7
IMPORTANT
There are different stages in the way coal forms. Write numbers against the following statements to show the correct order. One answer is done in the question.
| A very long time ago, trees used the energy from sunlight to grow | 1 |
|
The squashed remains hardened to form coal |
|
| Eventually, the trees died and fell over into boggy round | |
| Over time, the amount of soil and rocks on top increased and squashed the tree remains | |
| Layers of soil and rocks settled on top of the tree remains |
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Hydroelectricity is a renewable source of energy. Describe the water cycle that produces hydroelectricity.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
HARD
Lower Secondary Stage 7
IMPORTANT
