Chapetr 12 friction (quiz)

8/23/2020 CHAPTER 12 - FRICTION
https://testmoz.com/5242602/admin/key?word=0&version=a 1/9
CHAPTER 12 - FRICTION
This quiz contain total 44 questions.
Time - 50 min
Mark - 50 points
each question carry one mark
no negative marking for wrong answer
best of luck!
1. Nature of the surface is one of the factors affecting friction. When
we move on any surface, we apply a force to overcome the
interlocking of the surfaces. Rough surfaces have a larger number of
regularities and greater frictional force.
(1 point)
◯ True
◯ False
2. Can we reduce friction to zero? (1 point)
3. When we push the book on a table, a force is applied on it in the
opposite direction of the motion called force of friction. This force
opposes the movement and the book stops.
(1 point)
◯ True
◯ False
4. Friction is a /an_______ (1 point)
◯ Evil
◯ Foe

◯ Both
◯ None
5. To have a better grip by increasing friction between handle of the bat
and hands.
(1 point)
◯ True
◯ False
6. Friction produces heat. When we rub our hands together, the friction
arises between them and heat is produced. This makes our hands
warm. This is why people often rub their hands in winter.
(1 point)
◯ True
◯ False
7. The worn out tyres are discarded because their tread are worn off
and limiting their effectiveness of providing required amount of
friction.
(1 point)
◯ True
◯ False
8. The frictional force exerted by fluids is called drag. (1 point)
◯ True
◯ False
9. What kind of substances are known as lubricants (1 point)
◯ Increase friction
◯ Decrease friction
◯ Increase or decrease friction
◯ None of these

10. The force required to keep the object moving with the same speed
is a measure of sliding friction.
(1 point)
◯ True
◯ False
11. Which of the following is responsible for wearing out of bicycle
tyres?
(1 point)
◯ Muscular force
◯ Magnetic force
◯ Frictional force
◯ Electrostatic force
12. What is the name of special shape given to objects moving in
fluids?
(1 point)
13. Does friction depend on the nature of objects? (1 point)
14. The sole of shoes and the tyres of vehicles are treaded to
_________ friction.
(1 point)
15. Match the following (7 points)
____ Fluid Friction 1. Drag
____ Lubricants 2. Measures force
____ Wheels 3. Due to friction
____ Spring balance 4. Reduce friction
____ Shape of Aeroplane 5. Rolling friction
____ Rough surface 6. Increases friction
____ Heat generation 7. Streamlined

16. On what force of friction depends? (1 point)
◯ Smoothness of surface
◯ Roughness of surface
◯ Inclination of surface
◯ Al of above
17. Rolling friction is less than sliding friction. (1 point)
◯ True
◯ False
18. Rolling friction is smaller than? (1 point)
◯ Sliding friction
◯ Static friction
◯ Fluid friction
◯ All of the above
19. The shape of the airplane is like a (1 point)
◯ Bird
◯ Car
◯ Dog
◯ All
20. A spring balance is a device which measures the force acting on an
object. It contains a coiled spring. When a force is applied on it, the
spring gets stretched. The pointer moves on the scale showing the
magnitude of the force.
(1 point)
◯ True

◯ False
21. What is the force responsible for wearing out of bicycles tyres?
Answer:
(1 point)
22. The friction is caused by the interlocking of irregularities in the
two surfaces. It is obvious that the force of friction will increase if
two surfaces are pressed harder. This can be experienced by
dragging a mat when nobody is sitting on it and when a person is
sitting on it.
(1 point)
◯ True
◯ False
23. Commonly gases and liquids and solids are called fluids. (1 point)
◯ True
◯ False
24. Fluid are____ (1 point)
◯ Gases
◯ Liquids
◯ Gases and liquids both
◯ None of these
25. Will an object experience any force of friction which is falling
through a long straight glass having no air in it?
(1 point)
26. Which one of these characteristics does a smooth surface has? (1 point)
◯ Less frictional force
◯ More frictional force
◯ Sometimes less and sometimes more force

◯ All of above
27. The regularities on the two surfaces in contact is the cause of
friction.
(1 point)
◯ True
◯ False
28. Fish can easily swim in water because it has a streamlined body
which produces high friction. So it easily cuts through water and
moves in it very easily.
(1 point)
◯ True
◯ False
29. Lubricants ________ (1 point)
◯ Reduce friction
◯ Both
◯ None
30. When lubricants are applied between the moving part of a machine,
a thin layer is formed there and moving surfaces do not directly rub
against each other. Interlocking of irregularities is avoided to a
great extent and the movement becomes smooth.
(1 point)
◯ True
◯ False
31. When we press the brake lever, the brake pads arrest the motion of
the rim due to friction and the wheel stops moving. This is how
brake stops moving bicycles and automobiles.
(1 point)
◯ True
◯ False

32. The speed of the object with respect to the fluid, shape of the object
and nature of the fluid affect fluid friction.
(1 point)
◯ True
◯ False
33. Friction is sometimes _________ . (1 point)
34. The force acting on a moving object equal and opposite to the
direction of motion is called force of friction
(1 point)
◯ True
◯ False
35. Which surface does produce more friction—smooth or rough
surface?
(1 point)
36. The rolling friction is smaller than the sliding friction. In most
machines, sliding is replaced by rolling by using ball bearings to
reduce friction. This is why ball bearings are used between the hub
and axle of ceiling fan and bicycle.
(1 point)
◯ True
◯ False
37. When the box starts sliding, the contact points on its surface, do not
get enough time to lock into the contact points on the floor. So, the
sliding friction is slightly smaller than the static friction. Hence, it
is somewhat easier to move the box already in motion than to get it
started.
(1 point)
◯ True
◯ False
38. Is the friction same for all objects? (1 point)

39. Complete the sentence. Friction always ____________ (1 point)
◯ helps the motion
◯ opposes the motion
◯ both of these
◯ none of these
40. A soapy floor is slippery due to increased friction. (1 point)
◯ True
◯ False
41. The soles of shoes and tyres of vehicles like cars, trucks, etc., are
grooved to provide better grip on the floor or roads to move safely
because grooving increases friction.
(1 point)
◯ True
◯ False
42. The force required to overcome friction at an instant an object
starts moving from rest is a measure of _______ friction.
(1 point)
43. Friction is a __________ (1 point)
◯ Contact force
◯ Non-contact force
◯ Magnetic force
◯ None of these
44. Will force of friction come into play when a rain drop rolls down a
glass window pane?
(1 point)

https://testmoz.com/5242602/admin/key?word=0&version=a&key=1&explanations=1 1/9
CHAPTER 12 - FRICTION
This quiz contain total 44 questions.
Time - 50 min
Mark - 50 points
each question carry one mark
no negative marking for wrong answer
best of luck!
1. Nature of the surface is one of the factors affecting friction. When
we move on any surface, we apply a force to overcome the
interlocking of the surfaces. Rough surfaces have a larger number of
regularities and greater frictional force.
(1 point)
◯ True
⚫ False
2. Can we reduce friction to zero? (1 point)
no
3. When we push the book on a table, a force is applied on it in the
opposite direction of the motion called force of friction. This force
opposes the movement and the book stops.
(1 point)
⚫ True
◯ False
4. Friction is a /an_______ (1 point)
◯ Evil
◯ Foe

⚫ Both
◯ None
5. To have a better grip by increasing friction between handle of the bat
and hands.
(1 point)
⚫ True
◯ False
6. Friction produces heat. When we rub our hands together, the friction
arises between them and heat is produced. This makes our hands
warm. This is why people often rub their hands in winter.
(1 point)
⚫ True
◯ False
7. The worn out tyres are discarded because their tread are worn off
and limiting their effectiveness of providing required amount of
friction.
(1 point)
⚫ True
◯ False
8. The frictional force exerted by fluids is called drag. (1 point)
⚫ True
◯ False
9. What kind of substances are known as lubricants (1 point)
⚫ Decrease friction
◯ Increase or decrease friction
◯ None of these

10. The force required to keep the object moving with the same speed
is a measure of sliding friction.
(1 point)
⚫ True
◯ False
11. Which of the following is responsible for wearing out of bicycle
tyres?
(1 point)
◯ Muscular force
◯ Magnetic force
⚫ Frictional force
◯ Electrostatic force
12. What is the name of special shape given to objects moving in
fluids?
(1 point)
Streamlined
13. Does friction depend on the nature of objects? (1 point)
YES
14. The sole of shoes and the tyres of vehicles are treaded to
_________ friction.
(1 point)
increase
15. Match the following (7 points)
1 Fluid Friction 1. Drag
4 Lubricants 2. Measures force
5 Wheels 3. Due to friction
2 Spring balance 4. Reduce friction
7 Shape of Aeroplane 5. Rolling friction
6 Rough surface 6. Increases friction
3 Heat generation 7. Streamlined

16. On what force of friction depends? (1 point)
◯ Smoothness of surface
◯ Roughness of surface
◯ Inclination of surface
⚫ Al of above
17. Rolling friction is less than sliding friction. (1 point)
⚫ True
◯ False
18. Rolling friction is smaller than? (1 point)
◯ Sliding friction
◯ Static friction
◯ Fluid friction
⚫ All of the above
19. The shape of the airplane is like a (1 point)
⚫ Bird
◯ Car
◯ Dog
◯ All
20. A spring balance is a device which measures the force acting on an
object. It contains a coiled spring. When a force is applied on it, the
spring gets stretched. The pointer moves on the scale showing the
magnitude of the force.
(1 point)
⚫ True

◯ False
21. What is the force responsible for wearing out of bicycles tyres?
Answer:
(1 point)
Frictional
22. The friction is caused by the interlocking of irregularities in the
two surfaces. It is obvious that the force of friction will increase if
two surfaces are pressed harder. This can be experienced by
dragging a mat when nobody is sitting on it and when a person is
sitting on it.
(1 point)
⚫ True
◯ False
23. Commonly gases and liquids and solids are called fluids. (1 point)
◯ True
⚫ False
24. Fluid are____ (1 point)
◯ Gases
◯ Liquids
⚫ Gases and liquids both
◯ None of these
25. Will an object experience any force of friction which is falling
through a long straight glass having no air in it?
(1 point)
NO
26. Which one of these characteristics does a smooth surface has? (1 point)
⚫ Less frictional force
◯ More frictional force
Sometimes less and sometimes more force

◯
◯ All of above
27. The regularities on the two surfaces in contact is the cause of
friction.
(1 point)
◯ True
⚫ False
28. Fish can easily swim in water because it has a streamlined body
which produces high friction. So it easily cuts through water and
moves in it very easily.
(1 point)
◯ True
⚫ False
29. Lubricants ________ (1 point)
⚫ Reduce friction
◯ Both
◯ None
30. When lubricants are applied between the moving part of a machine,
a thin layer is formed there and moving surfaces do not directly rub
against each other. Interlocking of irregularities is avoided to a
great extent and the movement becomes smooth.
(1 point)
⚫ True
◯ False
31. When we press the brake lever, the brake pads arrest the motion of
the rim due to friction and the wheel stops moving. This is how
brake stops moving bicycles and automobiles.
(1 point)
⚫ True

◯ False
32. The speed of the object with respect to the fluid, shape of the object
and nature of the fluid affect fluid friction.
(1 point)
⚫ True
◯ False
33. Friction is sometimes _________ . (1 point)
undesirable
34. The force acting on a moving object equal and opposite to the
direction of motion is called force of friction
(1 point)
⚫ True
◯ False
35. Which surface does produce more friction—smooth or rough
surface?
(1 point)
Rough surface
36. The rolling friction is smaller than the sliding friction. In most
machines, sliding is replaced by rolling by using ball bearings to
reduce friction. This is why ball bearings are used between the hub
and axle of ceiling fan and bicycle.
(1 point)
⚫ True
◯ False
37. When the box starts sliding, the contact points on its surface, do not
get enough time to lock into the contact points on the floor. So, the
sliding friction is slightly smaller than the static friction. Hence, it
is somewhat easier to move the box already in motion than to get it
started.
(1 point)
⚫ True
◯ False

38. Is the friction same for all objects? (1 point)
No
39. Complete the sentence. Friction always ____________ (1 point)
◯ helps the motion
⚫ opposes the motion
◯ both of these
◯ none of these
40. A soapy floor is slippery due to increased friction. (1 point)
◯ True
⚫ False
41. The soles of shoes and tyres of vehicles like cars, trucks, etc., are
grooved to provide better grip on the floor or roads to move safely
because grooving increases friction.
(1 point)
⚫ True
◯ False
42. The force required to overcome friction at an instant an object
starts moving from rest is a measure of _______ friction.
(1 point)
static
43. Friction is a __________ (1 point)
⚫ Contact force
◯ Non-contact force
◯ Magnetic force
◯ None of these
44. Will force of friction come into play when a rain drop rolls down a (1 point)

glass window pane?
YES

Chapetr 12 friction (quiz)

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

More from Pooja M

More from Pooja M (20)

Recently uploaded

Recently uploaded (20)

Chapetr 12 friction (quiz)