Question

6. The flying plane offering the least frictional force, should be :
(a) irregular
(b) tree-like
(c) streamlined
(d) symmetrical with many arms
7. The force of friction is directly proportional to :
(a) size
(b) roughness of surface
(c) weight
(d) All these factors of the moving body
8. Friction between the two flat surfaces can be reduced by :
(a) painting
(b) greasing
(c) using ball bearing (d) decreasing the area
9. It is difficult to walk on ice because
(a) friction is high
(b) friction is low (c) pressure is low
(d) pressure is high
10. Friction is
(a) always an advantage
(b) always a disadvantage
(c) sometimes a disadvantage and sometimes an advantage
(d) neither an advantage nor a disadvantage​

Answer 1

Answer:

Explanation:

The flying plane offering the least frictional force, should be :

(a) irregular

(b) tree-like

(c) streamlined

(d) symmetrical with many arms

7. The force of friction is directly proportional to :

(a) size

(b) roughness of surface

(c) weight

(d) All these factors of the moving body

8. Friction between the two flat surfaces can be reduced by :

(a) painting

(b) greasing

(c) using ball bearing (d) decreasing the area

9. It is difficult to walk on ice because

(a) friction is high

(b) friction is low (c) pressure is low

(d) pressure is high

10. Friction is

(a) always an advantage

(b) always a disadvantage

(c) sometimes a disadvantage and sometimes an advantage

(d) neither an advantage nor a disadvantage