Class 8 Practice – Level 1 – Force and Pressure Leave a Comment / By Gulam Hamza / October 25, 2024 Class 8 Practice – Level 1 – Force and Pressure Total questions: 40 1. Which of the following best describes force? A push or pull acting on an object The mass of an object The speed of an object The gravitational pull of the Earth None 2. Which of these is NOT an effect of force on an object? Changing its speed Changing its shape Changing its color Changing its direction of motion None 3. Which of the following is a contact force? Gravitational force Magnetic force Muscular force Electrostatic force None 4. Pressure is defined as force acting on a unit: Mass Area Distance Time None 5. Force can cause an object to: Change shape only Move only Either move, change shape, or stop Stay in the same state None 6. The force that pulls objects towards the center of the Earth is called: Frictional force Muscular force Gravitational force Magnetic force None 7. The SI unit of pressure is: Newton Joule Pascal Watt None 8. Frictional force acts: Opposite to the direction of motion In the direction of motion Vertically upward Vertically downward None 9. Pushing a shopping cart is an example of: Gravitational force Muscular force Magnetic force Electrostatic force None 10. In a fluid, pressure is exerted: Only in one direction Only upward Equally in all directions Only downward None 11. The SI unit of force is: Pascal Newton Joule Watt None 12. A spring balance is used to measure: Mass Force Temperature Pressure None 13. Which of the following is a force that opposes motion? Magnetic force Friction Gravitational force Muscular force None 14. Which of these can a force NOT do? Start an object in motion Increase the mass of an object Change the shape of an object Stop a moving object None 15. Increasing the area over which a force acts will: Decrease pressure Increase pressure Have no effect on pressure Double the force None 16. What happens when balanced forces act on an object? The object starts moving The object stays stationary or continues moving with the same speed The object changes direction None 17. A force applied on an object in the opposite direction of its motion will: Speed up the object Have no effect Slow down the object Change the mass of the object None 18. A ball rolling on the ground stops after some time because of: Gravitational force Magnetic force Electrostatic force Frictional force None 19. Which of the following statements about pressure in gases is correct? Gases exert pressure in all directions Gases do not exert pressure Gases exert pressure only in the upward direction Gases exert pressure only at the top of a container None 20. On a smooth surface, the frictional force is: High Low Zero Unchanged None 21. The pressure exerted by a liquid at a given point is proportional to: The density of the liquid The color of the liquid The shape of the container The speed of the liquid None 22. Which of the following is an example of a non-contact force? Muscular force Frictional force Gravitational force Mechanical force None 23. Atmospheric pressure is caused by: The wind blowing over the surface The weight of air above us The heat from the Sun The rotation of the Earth None 24. Pressure in a liquid increases with: Increase in depth Increase in temperature Increase in color Decrease in area None 25. A force can change the: Mass of an object Time Shape of an object Distance between two objects None 26. Which of the following instruments is used to measure pressure? Thermometer Barometer Speedometer Galvanometer None 27. When a car accelerates, it is: Undergoing uniform motion In equilibrium Experiencing an unbalanced force Experiencing balanced forces None 28. The pressure exerted by a solid object is referred to as: Hydrostatic pressure Static pressure Dynamic pressure Pascal's pressure None 29. In fluid mechanics, the principle that explains why ships float is known as: Archimedes' principle Bernoulli's principle Pascal's law Newton's law None 30. In which scenario would pressure be the greatest? A balloon filled with air A bottle filled with water A tire filled with air A closed container with a gas None 31. When a soccer ball is kicked, what type of force is applied? Gravitational force Contact force Magnetic force Electrostatic force None 32. What is the typical unit of pressure used in weather reports? Bar Newton Joule Pascal None 33. If two people push a car in the same direction, the forces they apply are: Balanced Unbalanced Opposite Zero None 34. What does gravity do to a dropped object? Makes it float Has no effect Causes it to rise Causes it to fall None 35. In a closed container, the pressure of a gas increases when: The volume increases The temperature decreases The volume decreases The temperature remains constant None 36. Which of the following factors increases gravitational attraction between two objects? Increasing their mass Decreasing their distance Both a and b None of the above None 37. What is the formula for calculating pressure? Force × Area Force / Area Mass × Acceleration Mass / Volume None 38. If the area of contact is doubled while keeping the force constant, the pressure will: Double Halve Remain the same Quadruple None 39. Which of the following uses friction to function effectively? A skateboard A bicycle brake A car tire All of the above None 40. What is the standard unit of force in the International System of Units (SI)? Kilogram Joule Newton Meter None 1 out of 40 Time's up
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