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 : Crushing can experiment Hydraulic press All of these Altimeter None 2. 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 1:4 1:1 None 3. 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 10^6 pa 6.4 x 10^5 pa 6.4 x 10^4 pa 6.4 x 10^7 pa None 4. 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 5. Atmospheric pressure exerted on earth is due to the. Rotation of earth Uneven heating of earth Gravitational pull Revolution of earth None 6. 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 The pressure exerted by both is equal The pressure exerted by a blunt needle is more None of these None 7. 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 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. Both are true (i) True (ii) False (i) False (ii) True Both are false None 9. In terms of physics, which of the following are considered as fluids? Liquids and solids Only liquids Solids and Gases Gases and liquids None 10. Mark the correct statements 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 Newton's first law of motion, gives us notion of external forces All None 11. The fluid itself exerts pressure whose force component is equal to its ___________. Complete the sentence. Height Weight Depth None None 12. 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 Shape of rubber bulb Pressure of water Gravity of the earth None 13. Which of the following pairs of forces will never give resultant force of 2N 1N an 1N None of these 1N and 3N 2N and 2N None 14. At what position the fluid experiences more pressure In the middle of container At the bottom of container At top of container Outside the container None 15. Why does a sharp knife enable us to cut through things more easily? The pressure exerted is greater when the same force is used The sharp edge can pass through the material slowly The sharp edge is not felt when cutting through the material The pressure exerted is lesser when the same force is used None 16. 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 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.
