Force and Pressure - CLASS 08 - SCIENCE - Work Sheet

CBSE

Force and Pressure WS 10

CLASS 08 - SCIENCE

	Section A
1	In atmosphere, wind blows due to a) Heat difference at tropics b) Heat difference at equators c) Equal heating at two places d) Unequal heating at two places	[1]
2	A boy having area of 70 cm sq. exerts a pressure of 7N/cm sq. on the ground. The Force acting on the ground will be a) 77 N b) 10 N c) 490 N d) 100 N	[1]
3	At higher altitude, nose bleeding is a common problem because a) Blood pressure increase at higher altitude b) Atmospheric pressure is less at higher altitude c) Atmospheric pressure is more at higher altitude d) Blood pressure decreases at higher altitude	[1]
4	At high altitudes atmospheric pressure a) Is always zero b) Increases c) Remain same d) Decreases	[1]
5	One atmospheric pressure is equal to a) 2.5 10  N/m b) 1.1 10  N/m c) 1.01 10  N/m d) 1.5 10  N/m	[1]
6	The pressure inside our body is a) Less than atmospheric pressure b) More than atmospheric pressure c) Equal to the atmospheric pressure d) Absent	[1]
7	The weight of air in a column of the height of the atmosphere and area 10cm 10 cm is equal to a) 100 kg b) 1000 kg c) 58 kg d) 9.8 kg	[1]
8	Assertion (A): Sea divers wear special suits. Reason (R): The gravity is not affect under the sea. a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not the correct explanation of A. c) A is true but R is false. d) A is false but R is true.	[1]
9	Assertion (A): There is high atmospheric pressure in the space. Reason (R): Astronauts wear special suits. a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not the correct explanation of A. c) A is true but R is false. d) A is false but R is true.	[1]
10	Astronauts wear special suits when they go into space because pressure inside the suit is maintained at ______ . a) Body pressure b) Very low pressure c) Atmospheric pressure d) Variable pressure	[1]
11	The pressure inside our bodies is __________ to the atmospheric pressure. a) More b) Equal c) Less d) Negligible	[1]
12	Define the term atmospheric pressure.	[1]
13	What is atmosphere?	[1]
14	Can you separate two hemispheres, if all the air is suck out from them?	[1]
15	What is atmospheric pressure?	[1]
16	Do gases also exert pressure on the walls of containers?	[1]
	Section B
17	We know that there is a huge amount of atmospheric pressure on us. But we do not experience its effects why?	[2]
18	Observe the vessels A, B, C, and D shown in Fig. carefully. Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.	[2]
	Section C
19	What experiment was performed to prove that air has pressure?	[3]
	Section D
20	1.          What is meant by atmospheric pressure? What is the cause of atmospheric pressure? 2.          Why are our bodies not crushed by the large pressure exerted by the atmosphere?	[4]
21	1.          How does the pressure of a liquid depend on its depth? 2.          Explain why, the walls of a dam are thicker near the bottom than at the top?	[4]
22	Explain the atmospheric pressure used in the drinking straw.	[4]

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