MCQ'S ON FRICTION - CBSE, SSC

1. Friction:

A)   produces heat 

B)    causes wear and tear

C)    opposes motion         

D)   all of these

2. Wheel is made circular, because :

A)   it minimises friction   

B)    it increases friction

C)    to make them attractive          

D)   none of these

3. A cricketer catches a ball. The force coming in action is :

A)   contact force  

B)    gravitational force

C)    frictional force          

D)   all of these

4. Tyres are provided with deep grooves on their surface to :

A)   reduce the cost of material used

B)    increase the friction

C)    decrease the friction  

D)   make them attractive

5. Friction is :

A)   always a disadvantage           

B)    always an advantage

C)    sometimes a disadvantage and sometimes an advantage

D)   neither an advantage nor a disadvantage

6. Rockets have a special streamlined body in order to :

A)   increase friction        

B)    reduce friction

C)    make them attractive 

D)   none of these

7. The force of friction :

A)   increases with the weight of body

B)    decreases with the weight of body

C)    is not affected by the weight of body

D)   none of these

8. A matchstick struck on a matchbox catches fire easily because

A)   Friction may cause fire

B)    Of chemical reaction

C)    Force heated the match stick

D)   None of the above

9. Lubricants are substances which

A)   Increases friction

B)    Are used to light fire

C)    Reduces friction

D)   Are used to put off fire

10. The frictional force exerted by fluid is also called ______

A)   Drug

B)    drag

C)    drop

D)   drown

11. Four children were asked to arrange forces due to rolling, static and sliding frictions in a

increasing order. Their arrangements are given below. Choose the correct arrangement.

A)   Rolling, Static, Sliding

B)    Static, Rolling, Sliding

C)   Rolling, sliding, static

D)   Sliding, Static, Rolling

12.The sole of the shoes becomes plain after wearing it for several months. The reason is

A)   Wearing out due to friction   

B)    Wearing out due to no friction

C)    Sole is of bad quality

D)   None of the above

13. The body will move only when

A)   Force of friction = applied force

B)    Force of friction > applied force

C)    Force of friction < applied force

D)   All the above

14. Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

A)   only if the objects are solid.

B)    only if one of the two objects is liquid.

C)   

only if one of the two objects is gaseous.     

D)   irrespective of whether the objects are solid, liquid or gaseous.

15. In Fig, a boy is shown pushing the box from right to left.
The force of friction will act on the box

A)   from right to left (←)

B)    from left to right (→)

C)    vertically downwards (↓)

D)   vertically upwards (↑)

16. To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

A)   stone

B)    plastic block

C)    wooden block

D)   glass block