Ncert – class 8- science – Chapter 8: Force and Pressure 2 Welcome to your Ncert - class 8- science - Chapter 8: Force and Pressure 2 1. The tremendous pressure exerted by air can be demonstrated by : Altimeter Hydraulic press Crushing can experiment All of these None 2. Two vessels, one cylindrical and another cubical are filled by water to the same height. Near the base, lateral pressure exerted by the liquid on the wall will be more for cubic vessel will be more for cylindrical vessel will be zero will be same for both the vessels None 3. The fluid itself exerts pressure whose force component is equal to its ___________. Complete the sentence. Height Weight None Depth None 4. A block of mass of a 2kg with dimensions 5cm×20cm×10cm respectively. The ratio of minimum to maximum pressure it exerts on the change in orientation is: 1:2 4:1 1:1 1:4 None 5. Why does a sharp knife enable us to cut through things more easily? The pressure exerted is lesser when the same force is used The sharp edge is not felt when cutting through the material The pressure exerted is greater when the same force is used The sharp edge can pass through the material slowly None 6. When we press the bulb of dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to: Pressure of water Gravity of the earth Shape of rubber bulb Atmospheric pressure None 7. Which of the following pairs of forces will never give resultant force of 2N 2N and 2N None of these 1N and 3N 1N an 1N None 8. A 50 kg girl wearing heel shoes balances on a single heel. The heel is circular with a diameter 1 cm. The pressure exerted by the heel on the horizontal floor is then (Take g = 10 ms-2) 6.4 x 10^5 pa 6.4 x 10^7 pa 6.4 x 10^4 pa 6.4 x 10^6 pa None 9. Mark the correct statements Force exists only as a result of an interaction of two objects All Contact forces are forces in which the two interacting objects are physically in contact with each other Newton's first law of motion, gives us notion of external forces None 10. State whether the following statements are true or false? (i) the pressure inside our body is equal to the atmospheric pressure (ii) pressure is inversely proportional to the area. (i) True (ii) False Both are true Both are false (i) False (ii) True None 11. Atmospheric pressure exerted on earth is due to the. Gravitational pull Rotation of earth Revolution of earth Uneven heating of earth None 12. In terms of physics, which of the following are considered as fluids? Liquids and solids Gases and liquids Only liquids Solids and Gases None 13. Compare the pressure exerted by a sharp needle on a surface and the pressure exerted by a blunt needle. The pressure exerted by a sharp needle is more None of these The pressure exerted by a blunt needle is more The pressure exerted by both is equal None 14. Liquid pressure at a point in a liquid does not depend on the Density of liquid Acceleration due to gravity Shape of the vessel in which the liquid is kept Depth of the point from the surface None 15. At what position the fluid experiences more pressure In the middle of container At the bottom of container Outside the container At top of container None 16. What happens when pressure inside a sealed can is less than the atmospheric pressure? The can bursts The can swells No change is observed The can is crushed None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
