Force and Pressure Worksheet-3

Force and Pressure Worksheet-3

1. The given figure shows the cross section of a dam and its reservoir. The widening of the wall, towards the bottom is because of_____.

(a) increase in pressure with depth of water

(b) decrease pressure with depth of water

(c) change in density of water

(d) increase in mass of the wall

2. Which of the following statements is NOT true for friction force?

(a) Friction force is produced when two objects rub against each other

(b) A lighter object will experience a smaller frictional force

(c) friction produces more wear and tear

(d) friction is harmful

3. We use a straw (narrow pipe) to drink juice from a glass. This is possible due to presence of:

(a) liquid pressure                       (b) atmospheric pressure

(c) gravitational pull                   (d) all of these

4. The magnetic force between a magnet and a magnetic substance can cause:

(a) change of state                        (b) change of shape

(c) change of size                          (d) change of property

5. Two magnets A & B are placed with like poles having one above another. What will happen?

(a) A will stuck to B

(b) A will remain as shown in the figure

(c) A will move side ways

(d) Can't say

6. In cities water supply from an overhead tank to the houses is done due to:

(a) difference in pressure

(b) gravitational force

(c) decrease of friction in pipes

(d) flow of liquid

7. A mountain climber experiences a nose bleed due to:

(a) decrease in atmospheric pressure

(b) increase in atmospheric pressure

(c) more gravitational pull

(d) effect of high altitude

8. A deep sea diver may hurt his ear drum during diving because of:

(a) lack of oxygen                        (b) more atmospheric pressure

(c) more water pressure             (d) all of these

9. Which of the following is NOT true?

(a) A sharp knife can easily cut due to its small cutting surface

(b) It is easier to walk in sand than on road

(c) A battle tank can move easily on soft ground because its tracks have bigger surface

(d) The pressure exerted by a needle is much more than the foot of an elephant

10. What is wrong in this figure?

(a) water flowing through hole 'P' will move a smaller distance as comp­ared to Q and R

(b) water flowing through hole 'Q' will be maximum

(c) water flowing through 'R' will be more than 'Q' but less than 'P'

(d) water flowing through all holes will travel same distance as pressure exerted by a liquid is equal in all direction

Answer Key:

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