Force and Pressure Worksheet-5

Force and Pressure Worksheet-5

1. A rubber sucker sticks to a surface because of:

(a) property of rubber                (b) gravitational force

(c) elastic spring force                (d) atmospheric pressure

2. A body submerged in the sea is brought upto its surface. Which of the following graphs represents correctly the variation of the pressure on the body with decrease in the depth?

(a)

(b)

(c)

(d)

3. Four forces are acting on a body. If the body doesn't change its position or shape, the forces:

(a) must be of equal magnitude

(b) must be parallel & opposite

(c) must add up to zero when taken as vectors

(d) must be in a single line

4. While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure:

(a) larger friction                         (b) smaller friction

(c) larger normal force               (d) smaller normal force

5. The force between two charged bodies is called

(a) Muscular force                       (b) Gravitational force

(c) Magnetic force                        (d) Electrostatic force

6. Match the columns and mark the correct option from the codes given below.

(a) (A)-(I), (B)-(II), (C)-(III)

(b) (A)-(II), (B)-(III), (C)-(I)

(c) (A)-(II), (B)-(I), (C)-(II)

(d) (A)-(III), (B)-(II), (C)-(I)

7. Jaya noted that the pointer shows a reading of 25 cm on the ruler. When she placed 50 g mass on the dish, the pointer showed a reading of 20 cm.

Which one of the following is most possible explanation for this?

(a) The 50 g mass was wrongly labelled

(b) The spring weakened its elastic spring force

(c) The ruler was placed the wrong way round

(d) The ruler moved with the spring

8. Gautam finds it difficult to walk on an icy surface because _______.

(a) Gravitational force exerted on an icy surface is less than on other surface

(b) Gravitational force exerted on an icy surface is greater than on other surfaces

(c) There is little or no friction between his shoes and the ice

(d) There is too much friction between his shoes and the ice

9. The below figures show the forces required to move a 100 g object over different surfaces. The friction is greatest at.

(a) Surface P     (b) Surface Q    (c) Surface R    (d) Surface S

10. In which of the following activities is work done

(a) A boy shaking a tree

(b) All pushing against the wall

(c) A man pushing a stalled car

(d) A worker pushing a loaded car

Answer Key:

(1)-(d); (2)-(b); (3)-(c); (4)-(d); (5)-(d); (6)-(b); (7)-(c); (8)-(c); (9)-(a); (10)-(c)