Question

1. Tick the correct option:
(a) Work is done by:
(i) force
(ii) energy
(iii) both (i) and (ii) (iv) none of these
(b) The force present between two surfaces is
force
(i) frictional (ii) gravitational (iii) magnetic
(iv) muscular
(c) The force of gravitation:
(1) pulls objects down
(ii) pushes objects upwards
(iii) keeps objects static
(iv) all of the above
(d) Force can:
(i) move an object
(ii) slow down a moving object
(iii) change the shape of an object
(iv) all of these
(e) Scissors, pliers and tongs are all examples of:
(i) lever
(ii) pulley
(iii) screw
(iv) wedge
2. State true (T) or false (F):
(a) A moving object comes to a stop when a force acts on it.
(b) A smooth surface has more friction.
(c) Work is done when force is applied.
(d) A pulley is used to draw water from a well.
(e) Windmills use energy of blowing wind to generate electricity.
3. Fill in the blanks:
(a) Food gives us....
to do work
(b) Plants make their food by using energy from the......
(c) Force can....
things which are at rest.
(d) Electricity is produced by.....
in dams.
e).......energy runs a mixer grinder.
...​

Answer 1

1. force
2. frictional
3. pulls objects down
4. all of these
5. true
6. false
7. false
8. true
9. true

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Answer 2

Answer is:

1.

(a). Force.

(b). Frictional.

(c). Pulls object down.

(d). all of these.

(e). wedge.

2.

(a). true.

(b). false.

(c). true.

(d). true.

(e). true.

3.

(a). Energy.

(b). sunlight.

(c). Water turbine.

(e). potential.