Q1. Friction depends on theof a surface. a. Smoothnessb. Sizec. Matterd. ColorQ2.Sliding friction isthan static friction. a. Greaterb. Lessc. Equald. Depends Q3.Friction opposes thebetween two surfaces in contact. a. Refractive motionb. Motionc. Rotary motiond. Relative motion Q4. The frictional force exerted by fluids is also called a. Smugb. Slagc. Rungd. DragQ5. Striking a matchstick produces fire by a. Frictionb. Contact forcec. Physical reactiond. Chemical reaction Q6. It is easier to hold an earthen pot than a steel pot as a/an a. Steel pot has more frictionb. Earthen pot has less frictionc. Earthen pot has more frictiond. Steel pot is comparatively heavier Q7. The shape of fish is streamlined to a. Increase fluid frictionb. Facilitate breathingc. Change the directiond. Decrease fluid friction Q8. In which of the following activities friction is useful? a. Heating of moving bodiesb. Movement of machinec. Wearing and tearing of shoe soled. Walking on ground Q9. Soapy water on floor would make it a. Difficult to walkb. More hygienicc. More cleand. Easier to walk Q10. Which of the following is characteristic of friction? a. It can change the direction of motionb. It is a non contact forcec. It works on only resting bodyd. It works opposite to direction of motion Q11. The force required to keep the object moving with same speed is a measure of a. Contact frictionb. Sliding frictionc. Static frictiond. Rolling friction Q12. It is difficult to walk of smooth surface due to a. Less frictionb. More frictionc. Without frictiond. Absolute friction Q13. If an object started moving, it would never stop if a. There is moderate frictionb. There is low frictionc. There is high frictiond. There is no frictionQ14. A polished surface is a. Very slipperyb. Entirely friction freec. Very roughd. Very high friction Q15. The frictional force on an object in a fluid depends on its a. Density of fluidb. Mass of objectc. Color of fluidd. Speed of objectQ16. All vehicles are designed to have shapes which a. Increase frictionb. Reduce frictionc. Neglect fluid frictiond. Make fluid friction zero Q17. It is difficult to write on polished surface with pencil because a. Friction prevents the movement of pencilb. Polished surfaces have no frictionc. Polished surfaces have less frictiond. Polished surfaces have high frictionQ18. Boat and ship have pointed tips to a. Increase the beautyb. Decrease friction due to liquidc. Increase friction due to liquidd. Make them more attractive Q19. When we attempt to move any surface, we apply a force to overcome a. Vander wall forces between surfacesb. Interlocking between surfacesc. Gravitational forced. Electrostatic forces between particlesQ20. The sole of shoes becomes flat after using few months because of a. Wearing due to rough weatherb. Wearing due to bad qualityc. Wearing due to frictiond. All of the above

samridhi , 4 Years ago

Grade 8