Question

C4. Multiple Choice Questions (MCQs): Choose the correct answer for each of the following.
1. The frictional force exerted by fluids is called
(a) drag.
(b) sliding friction.
(c) rolling friction.
(d) none of these.
2. Friction between two flat surfaces cannot be reduced by
(a) greasing.
(b) polishing.
(c) using ball bearing.
(d) decreasing the area.
3. Rolling friction is always less than the
(a) sliding friction.
(b) static friction.
(c) both (a) and (b).
(d) fluid friction.
4. Which of the following is not an effect of friction?
(a) Moving objects slow down
(b) Moving objects stop
(c) Moving objects wear off
(d) Moving objects have weight
5. A flying machine offering the least frictional force should be
(a) irregular.
(b) tree-like.
(c) symmetrical with many arms.
(d) streamlined.
6. Lubrication of the moving surfaces
(a) removes friction.
(b) reduces friction.
(c) increases friction.
(d) has no effect on friction.​

Answer 1

Answer:

1. drag

2.using ball bearing

3.static friction

4.moving object wear off

5.streamlined

6.reduces friction

Answer 2

Answer:

1. The frictional force exerted by fluids is called

Ans: (b) sliding fiction.

2. Friction between two flat surfaces cannot be reduced by

Ans: (d) decreasing the area.

3. Rolling friction is always less than the

Ans: (c) both (a) and (b).

4. Which of the following is not an effect of friction?

Ans: (d) moving objects have weight.

5. A flying machine offering the least frictional force should be

Ans: (d) streamlined.

6. Lubrication of the moving surfaces

Ans: (b) reduces friction.

Hope this helped you

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