CBSE Class 8 Science Force and Pressure Worksheet Set B

Question. The figure shows a cylindrical can with four holes on one side. If water is filled in the can, which figure correctly represents the situation?

Answer : C

Question. We know that the pressure of water increases with depth. Then, which of the following shows the most possible shape of a dam?

Answer : C

Question. A truck, a car and a cycle have left tracks on the mud. Police are trying to find out the order and direction in which these three vehicles passed. Can you help them?

(a) First truck, then car, then cycle - all left to right.
(b) First cycle, then car, then truck - direction not known.
(c) First truck, then car, then cycle - direction not known.
(d) Neither order nor direction can be found.

Answer : C

Question. A special container with tubes P, Q, R, S and T is designed as shown below. Tubes P, Q, R and S have stoppers at the top.
What will happen to the water level in the different tubes if the stoppers in only P, R and S are removed?

(a) The water level in all the tubes will remain unchanged.
(b) The water level in all the tubes will become the same.
(c) The water level in Q will be lower than the others, which will all be the same.
(d) The water level in Q and S will be at one level; and in P, R and T at a higher level.

Answer : C

Question. Figure 1 below shows a boat as seen from a point above it. Figure 2 is the view of the same boat from the same point 5 seconds later. The oar that pushes the boat forward is like a lever having a Load, Effort and Fulcrum. Which point corresponds to the Fulcrum?

(a) A
(b) B
(c) C
(d) D

Answer : D

Question. F = m x a. Here 'F' is Force, 'm' is mass and 'a' is acceleration. If 'a' is replaced by 'g' which is acceleration due to gravity, then 'F' will be replaced by
(a) Mass
(b) Weight
(c) Pressure
(d) Work done

Answer : B

Question. A ball is released from position S on the surface shown. Which of the following can be the position of the ball when it finally stops?

(a) Definitely P
(b) Definitely Q
(c) Definitely R
(d) P or R

Answer : D

Question. Among the following simple machines, which is the odd one out?

Answer : D

Question. Which of the simple machines shown below has the load between the fulcrum and the effort?

Answer : A

Question. I am travelling in a car, which is moving fast along a straight road. The car comes to a sudden halt. I will
(a) Feel a force pulling me ahead.
(b) Feel a force pushing me back.
(c) Feel a force pushing me to the side.
(d) Not feel any force at all.

Answer : A

Question. The picture here shows a nail being removed from a piece of wood. In which direction should force be applied

(a) A
(b) B
(c) C
(d) D

Answer : B

Question. What will happen if a solid having the SAME density as the liquid is placed in it?

(a) It will sink.
(b) It will float.
(c) It will stay in any position within the liquid.
(d) A solid cannot have the same density as a liquid.

Answer : C

Question. Lorna and Kiran (who weigh the same) went to their school's annual day wearing shoes as shown here. Whose shoes would make a deeper impression in the wet, sandy ground there

(a) Lorna's shoes would make a deeper impression.
(b) Kiran's shoes would make a deeper impression.
(c) Both shoes will make impressions of the same depth
(d) It depends on who is fatter, so we cannot tell.

Answer : B

Question. The rate of flow of a liquid is sometimes defined as the mass of the liquid flowing per unit time. Which of these could be the units of rate of flow defined this way?
(a) kg/m
(b) kg/s
(c) m/s
(d) M3/s

Answer : B

Question. The diagram below shows a boat floating on water. The arrows show the force of the water on the boat and also the downward weight force If two people get into the boat what will happen to the sizes of these forces?

(a) Both the weight and upward force will increase equally.
(b) Both will increase, but the increase in the weight will be more.
(c) The weight increases and the upward force decreases.
(d) Both will increase, but the increase in the upward force will be more.

Answer : A
 

              Questions

              Very Short Answer

Q1)       What is force of gravity?

Q2)       What is atmosphere?

Q3)       Define electrostatic force?

Q4)       Define pressure?

Q5)       Who invented the pump to extract air out of a vessel?

             Short Answer

Q6)       What do you understand by the gravitational force?

Q7)       What is pressure exerted by the liquid?

Q8)       Distinguish between gravitational force and electrostatic force?

Q9)       Define atmospheric pressure?

Q10)     What is pressure exerted by the gas?

             Long Answer

Q11)     State the difference between friction and gravity?

Q12)     Explain about non-contact force?

Q13)     Difference between force and pressure?

Q14)     Write short note on magnetic force?

Q15)     Write short note on atmospheric pressure?