DAV Class 6 Science Solution Chapter 10 Work and Energy
DAV School Books Class 6 Science Solution Chapter 10 Work and Energy all Question Answer. DAV Class 6 10th Chapter Work and Energy full Chapter explanation by expert teacher.
DAV School Books Class 6 Science Solution Chapter 10 Work and Energy:
A.) Fill in the blanks.
Answer: (1) electric force, displacement.
Answer: (2) Energy.
Answer: (3) Chemical.
Answer: (4) Sun.
Answer: (5) electrical.
B.) Write True or False for the following statements.
Answer: (1) True.
Answer: (2) True.
Answer: (3) False.
Answer: (4) False.
Answer: (5) True.
C.) Tick (✓) the correct option.
1.) In which of the following situations, no ‘work’ is being done?
Answer: (d) just holding a book in your hand for two minutes.
2.) The ability, or capacity, of a body to do work is known as ______.
Answer: (c) Energy.
3.) The form of energy, possessed by flowing water, is known as ____.
Answer: (b) Kinetic energy.
4.) The energy, associated with wind, is an example of _____.
Answer: (b) Kinetic energy.
5.) When a rubber band is stretched, it can be said to have gained _____.
Answer: (c) Potential energy.
D.) Answer the following questions in brief.
1.) Write the meaning of the following terms.
(a) work
(b) energy
Answer: Work -When a force acting on a body produces some displacement of the body in its own direction is known as work.
Energy – capacity to do work is known as energy.
2.) State the conditions under which work is said to have been done.
Answer:-
Work is said to be under these two conditions
1.) Force to be applied
2.) Displacement should be produced in the applied force.
3.) Name any three different forms of energy.
Answer:-
1.) Chemical energy
2.) Heat energy
3.) Sound energy
(4) State the type of mechanical energy possessed by the following:
(a) a bullet fired from a gun.
(b) the wound up spring of a toy car.
(c) the water, stored at a height, in a tank.
(d) a moving bus.
Answer:-
(a) Kinetic energy
(b) Potential energy
(c) Potential energy
(d) Kinetic energy.
(5) State two different uses of light energy.
Answer:-
Different uses of light energy –
(1) Light energy used in solar cells to produce electricity
(2) Plants use light energy for photosynthesis
(E) Answer the following questions.
(1) Is there a difference between ‘applying a force’ and ‘doing work’? Give reason for your answer.
Answer:- Yes there is a difference between applying force and doing work because when something is pushed that time force is applied. But when displacement happens that time work is done.
(2) Explain, by giving an example, that a moving object can do work.
Answer:-
An example of moving objects that can do work is a moving ball that can break the glass of a car.
(3) A porter keeps standing at a place while holding a suitcase of mass 20 kg over his head for five minutes. Has he done some work? Give reason for your answer.
Answer:- When displacement takes place that work is done but the porter has not done any work because displacement does not take place as the poster is standing at a place.
(4) Define the term ‘energy’. Describe an activity to show the inter-relationship between work and energy.
Answer:-
Energy – Energy is the capacity to do work.
Work and energy are interrelated to each other. Work is done when energy is transferred to that object.
Example – When we throw a ball we use the muscular energy and work is done as the ball moves.
(5) Name a device which converts
(a) electrical energy into light energy.
(b) sound energy into electrical energy.
(c) chemical energy into electrical energy.
Answer:-
(a) Electric energy into light energy – electric tubelight.
(b) Sound energy into electric energy – microphone.
(c) Chemical energy into electric energy – battery cells.
Value based questions
Q.) Kshitij visited his native village during the summer vacations. While taking a stroll in the field, he saw a boy aiming his catapult at a bird. He asked the boy not to do so and to use his energy for helping, rather than harming, others.
(1) Which quality of Kshitij’s behaviour do you appreciate?
Answer:- kindness.
(2) What kind of energy is possessed by the –
(a) stretched string of the catapult?
(b) the stone when it gets released from the catapult?
Answer:- (a) stretched string of catapult.
(3) Do you think that Kshitij did the right thing by asking the boy not to hit the bird?
Answer:- Yes she did the right thing by asking the boy not to hit the bird because he can help animals instead of hurting them.
Something To Do
(1) List some examples in which no work is done on a body even though a force acts on it.
Answer:-
Pushing walls and standing with pot on the head are some examples in which no work is done on a body even though a force acts on it.
(2) We can easily perform several tasks, like opening a bottle, or lifting heavy objects, easily by using ‘simple machines’. Suggest some activities/tasks, which illustrate the usefulness of some common machines.
Answer: Scissor is the common machine, door handle, hammer, knife, bottle opener, screwdriver, etc.
For more updates, follow our netexplanations home page