Class 8th Science Chapter – 9 Friction
| Textbook | NCERT |
| Class | 8th |
| Subject | Science |
| Chapter | 9th |
| Chapter Name | Friction |
| Category | Class 8th Science |
| Medium | English |
| Source | Last Doubt |
| Class 8th Science Chapter – 9 Friction MCQ With Answer What causes friction?, What are the 3 types of friction?, What are the 4 main types of friction?, What type of force is friction?, What is called friction?, Why is friction important?, Which is useful friction?, Who discovered friction?, How to reduce friction?, What is an example of a friction?, What is SI unit of friction?, What is angle of friction?, How to calculate friction?, What affects friction?, What is a good friction material?, Is friction good or bad why? |
Class 8th Science Chapter – 9 Friction
Chapter – 9
Friction
MCQ
| (1) When one body roth over the surface of another body, the resistance to Its motion is called ? A. sliding friction B. rolling friction C. static friction D. none of these Answer – (B) rolling friction |
| (2) Drag is ? A. frictional force exerted by solids B. frictional force exerted by liquids C. frictional force exerted by gases D. frictional force exerted by fluids Answer – (D) frictional force exerted by fluids |
| (3) Function can be reduced by ? A. using lubricants B. polishing C. using fine powder D. all of these Answer – (D) all of these |
| (4) In which of the following friction is helpful ? A. the engine of car becomes hot after running for some time B. soles of shoes were out after sometime C. pulling a drawer out of a desk D. using a towel to open a tightly closed lid of a bottle Answer – (D) using a towel to open a tightly closed lid of a bottle |
| (5) In which of the following friction is troublesome ? A. sharpening a knife by rubbing it against a stone B. applying the brekes to stop a cycle. C. walking on a wet road D. rubbing the matchstick with the side of matchbox before burning it Answer – (C) walking on a wet road |
| (6) Drag is ? A. frictional force exerted by solids B. frictional force exerted by fluids C. both A. and B. D. none of these Answer – (B) frictional force exerted by fluids |
| (7) Ball hearing ? A. reduces friction B. increases friction C. make no change in friction D. none of these Answer – (A) reduces friction |
| (8) Which of the following has least friction ? A. rolling friction B. static friction C. sliding friction D. none of these Answer – (A) rolling friction |
| (9) To increase friction ? A. the surface is made smooth B. the surface is polished C. the surface is made rough D. powder is sprinkled on the surface Answer – (C) the surface is made rough |
| (10) Friction the rehuye motion between Io surfaces In contact ? A. favours B. opposes C. is D. none of these Answer – (B) opposes |
| (11) To convert the static, sliding friction into rolling friction, the heavy luggage carriers are attached with at their base ? A. ball-bearings B. chains C. tyres D. wheels Answer – (D) wheels |
| (12) Ball-bearings are used to convert static friction into ? A. drag B. sliding friction C. rolling friction D. none of these Answer – (C) rolling friction |
| (13) When two objectives are already moving the friction between them is called ? A. rolling friction B. static friction C. sliding friction D. friction of fluid Answer – (C) sliding friction |
| (14) This type of friction is the most powerful of all types of frictions ? A. static B. rolling C. sliding D. drag Answer – (A) static |
| (15) The frictional force of smooth surface is ? A. less B. more C. zero D. none of these Answer – (A) less |
| (16) The main cause of wear and tear of machine is ? A. poor quality of machine B. friction acting between different moving parts C. gravitational force of earth D. none of these Answer – (B) friction acting between different moving parts ? |
| (17) A coin pushed on a table stops because ? A. no force acts on it B. it is very heavy C. the table exerts a frictional force on it D. the earth attracts it Answer – (A) no force acts on it |
| (18) The force of friction between two bodies is ? A. parallel to the contact surface B. inclined at 30° to the contact surface C. perpendicular to the contact surface D. inclined at 60° to the contact surface Answer – (A) parallel to the contact surface |
| (19) Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be ? A. wet marble floor, dry marble floor, newspaper and towel B. newspaper, towel, dry marble floor, wet marble floor C. towel, newspaper, dry marble floor, wet marble floor D. wet marble floor, dry marble floor, towel, newspaper Answer – (B) newspaper, towel, dry marble floor, wet marble floor |
| (20) Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below – Choose the correct arrangement ? A. rolling, static, sliding B. rolling, sliding, static C. static, sliding, rolling D. sliding, static, rolling Answer – (C) static, sliding, rolling |
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