Ncert – class 8- science – Chapter 8: Force and Pressure 2 Welcome to your Ncert - class 8- science - Chapter 8: Force and Pressure 2 1. 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: Shape of rubber bulb Gravity of the earth Atmospheric pressure Pressure of water None 2. Liquid pressure at a point in a liquid does not depend on the Shape of the vessel in which the liquid is kept Density of liquid Acceleration due to gravity Depth of the point from the surface None 3. 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 can pass through the material slowly The pressure exerted is greater when the same force is used The sharp edge is not felt when cutting through the material None 4. Which of the following pairs of forces will never give resultant force of 2N 1N and 3N 1N an 1N 2N and 2N None of these None 5. What happens when pressure inside a sealed can is less than the atmospheric pressure? The can swells No change is observed The can is crushed The can bursts None 6. The tremendous pressure exerted by air can be demonstrated by : All of these Hydraulic press Altimeter Crushing can experiment None 7. At what position the fluid experiences more pressure Outside the container At top of container In the middle of container At the bottom of container 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 10^4 pa 6.4 x 10^5 pa 6.4 x 10^6 pa 6.4 x 10^7 pa None 9. Mark the correct statements All Newton's first law of motion, gives us notion of external forces Contact forces are forces in which the two interacting objects are physically in contact with each other Force exists only as a result of an interaction of two objects None 10. Atmospheric pressure exerted on earth is due to the. Rotation of earth Revolution of earth Uneven heating of earth Gravitational pull None 11. 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: 1:1 4:1 1:4 1:2 None 12. The fluid itself exerts pressure whose force component is equal to its ___________. Complete the sentence. Weight Height Depth None 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 blunt needle is more None of these The pressure exerted by both is equal The pressure exerted by a sharp needle is more None 14. 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 cylindrical vessel will be same for both the vessels will be more for cubic vessel will be zero None 15. 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. Both are false (i) False (ii) True Both are true (i) True (ii) False None 16. In terms of physics, which of the following are considered as fluids? Solids and Gases Liquids and solids Only liquids Gases and liquids 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 commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
