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 : All of these Crushing can experiment Altimeter Hydraulic press None 2. 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 The pressure exerted by a sharp needle is more The pressure exerted by both is equal None of these None 3. What happens when pressure inside a sealed can is less than the atmospheric pressure? The can is crushed The can bursts No change is observed The can swells None 4. Mark the correct statements Newton's first law of motion, gives us notion of external forces All Force exists only as a result of an interaction of two objects Contact forces are forces in which the two interacting objects are physically in contact with each other None 5. 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: Atmospheric pressure Gravity of the earth Pressure of water Shape of rubber bulb None 6. In terms of physics, which of the following are considered as fluids? Gases and liquids Liquids and solids Solids and Gases Only liquids None 7. 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 10^6 pa 6.4 x 10^7 pa 6.4 x 10^5 pa None 8. 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 (i) False (ii) True Both are false Both are true None 9. Atmospheric pressure exerted on earth is due to the. Revolution of earth Gravitational pull Rotation of earth Uneven heating of earth None 10. Which of the following pairs of forces will never give resultant force of 2N 1N an 1N 1N and 3N 2N and 2N None of these None 11. At what position the fluid experiences more pressure Outside the container At the bottom of container In the middle of container At top of container None 12. 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 pressure exerted is greater when the same force is used The sharp edge is not felt when cutting through the material The sharp edge can pass through the material slowly None 13. 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: 1:4 1:1 4:1 1:2 None 14. Liquid pressure at a point in a liquid does not depend on the Shape of the vessel in which the liquid is kept Depth of the point from the surface Density of liquid Acceleration due to gravity None 15. The fluid itself exerts pressure whose force component is equal to its ___________. Complete the sentence. None Height Weight Depth None 16. 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 same for both the vessels will be more for cylindrical vessel will be zero will be more for cubic vessel 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.
