6th Std Science 11 Work and Energy l Question and Answer l

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Science Studies -  6th Standard

11. Work and Energy

Question And Answer

1. Fill in each blank with the appropriate term from the brackets.

(a) A bucketful of water is to be drawn from a well. Work will be done when a force is applied to do this, because there will be a displacement of water.

(displacement, work, force)

(b) If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the ground. That is, transformation of potential energy into kinetic energy takes place.

(kinetic, potential, motion)

(c) You might have seen some beautiful fireworks during Diwali. It is an example of transformation of chemical energy into light energy.

(light, atom, chemical, solar) 

(d) The solar cooker is an application of the heat energy of the sun, while solar cells, solar lamps are applications of the light energy of the sun.

(light, chemical, heat)

(e) One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance. equal work will be done.

(equal,more, less) 

(f) The capacity that an object has for doing work is called energy.

(energy, displacement, force)

2. Match the pairs.

3. Can you tell ?

(a) When can we say that displacement has taken place ?

Ans: We can say that displacement has done when the position of the object change.

(b) What should be taken into account for measuring work ?

Ans: Force and displacement

(c) What are the various forms of energy ?

Ans: 1) Mechanical energy 2) Heat energy 3) Light energy 4) Sound energy 5) Chemical energy 6) Electrical energy

(d) Describe one natural chain of transformation of energy.

Ans: 1) Water cycle evaporate due to heat of the sun. This water vapour forms clouds that gives rain.

2) Rainwater flows into rivers and a store in reservoirs on dams.

3) This hour at a height and therefore their water has potential energy which transfer made into kinetic energy as the water falling downward.

4) When the water falls on the turbine, its kinetic energy is transferred to the turbine.

5) The turbine producing electrical energy. Electrical energy is used in our house for various purpose. 

(e) Why should we save energy ?

Ans: 1) Saving energy is as good as generating energy.

2) Due to the increasing population and increasing use of energy resources, there is a danger that the limited resources of coal, petrol, diesel, crude oil and natural gas will be exhausted.

3) Also due to overuse of energy, lots of polluting gases are released in the atmosphere this leads to pollution and global warming. Thus in order to preserve natural resources and conserve environment, we must save energy. 

(f) What is ‘green energy’ ?

Ans: The energy resources which do not produce smoke and carbon gases such as carbon dioxide or carbon monoxide is

called green energy.

(g) What are the non-conventional energy resources ?

Ans: Non-conventional energy resources are inexhaustible and continuous and can be used in various forms again and again. Ex. 1) solar energy 2) wind energy 3) tidal energy 4) hydroelectric or hydro power 5) atomic energy 

(h) Which forms of energy from the sun are used in solar energy devices ?

Ans: Heat energy, Light energy, Chemical energy

(i) Why should we maximise the use of non-conventional

energy resources ?

Ans: Due to increasing population and increasing use of energy resources were there is a danger that the limited resources of coal, petrol, diesel, crude oil and natural gas will get exhausted. Therefore we should maximize the use of non-conventional energy resources.

4. Who is the odd-one-out ?

(1) Diesel, crude oil, natural gas, wind

Ans: Wind

(2) A running car, hauling a log, a book kept on a table, picking up the school bag.

Ans: A book kept on a table

(3) Sunlight, wind, waves, petrol

Ans: Petrol

(4) Leaving the fan on in a vacant room, leaving the TV on while working, using AC during winter, putting off the light when

going out.

Ans: Putting off the light when going out 

5. Find out the types of energy from the following puzzle.

Ans:

Thank You..

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