Friction Test

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Friction Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Match the following
List I List II
1 Streamlined body structure a Less no. of irregularities
2 Pressing two objects harder against each other b Lubricant
3 Grease c Increase friction
4 Smooth surface d Decrease friction

A
1-d, 2-c, 3-b, 4-a

B
1-d, 2-c, 3-a, 4-b

C
1-a, 2-d, 3-b, 4-c

D
1-a, 2-b, 3-c, 4-d

Solution

1) A streamlined body structure helps in decreasing friction as it helps to move through fluids easily.

2)When two objects are pressed harder against each other, their irregularities lock tightly and increase the friction.

3)Grease acts as a lubricant that reduces friction by forming a layer between two surfaces in contact, thus preventing them from directly rubbing against one another.

4) A smooth surface has fewer irregularities and hence offers less friction.
Question 2
1 / -0

After an aeroplane completes a voyage, its muzzle feels warmer than the middle and back portion of the main body. This is because:

A
the muzzle tears apart the air layers and suffers more air friction

B
the muzzle suffers less air friction

C
the muzzle suffers zero air friction

D
none of these

Solution

Aeroplanes are given streamline shapes. Due to this special shape, the muzzle tears apart the air layers faced while the plane is in motion. So, the muzzle encounters more air friction and becomes warmer.
Question 3
1 / -0

A ball is rolled on four surfaces:
a) marble floor,
b) on sand,
c) on cloth,
d) on wood.
The force of friction acting on the ball on these different surfaces in descending order will be:

A
b > c > d > a

B
c > b > d > a

C
d > b > a > c

D
a > b > c > d

Solution

Friction is caused due to the irregularities in the surfaces in contact. Larger the irregularities, i.e., rougher the surface, more is the friction. The surface of sand is the roughest of all, followed by cloth, wood and marble floor. Thus, maximum friction will be observed in sand followed by cloth, wood and marble floor.
Question 4
1 / -0

If we drop a cup of water on a plate and a cup of oil on another plate, water is seen to spread faster along diameter. This is an example related to:

A
fluid friction

B
rolling friction

C
sliding friction

D
static friction

Solution

This example relates to fluid friction. Speed of spreading of a volume of liquid depends on the liquid friction.Friction offered by water is less as its density is less than oil.Fluid friction depends on density of liquid.
So oil being more dense have more friction and it moves very slowly due to more friction.
Question 5
1 / -0

A car will skid more on a wet road than on a dry road and the car tyres there is more:

A
friction

B
lubricant

C
gravity

D
heat

Solution
Question 6
1 / -0

What measures are taken to reduce fluid friction in aeroplanes?

A
Optimum speed is maintained with respect to the air

B
Metals are choosen in a way to make the aeroplane lighter with smoother surface

C
Streamlined body inspired by birds

D
All of the above

Solution

It is very important to minimize the fluid friction for airplanes because more friction will produce more heat, which may harm the plane. Thus, various measures are taken to reduce friction. An optimum speed is maintained and the body structure of the plane is more streamlined so that it can cut through the air with minimum friction. Also, such metals are chosen to make the body of the airplane, which are light, strong, and able to form a smooth surface. This smooth surface ensures lesser friction.
Question 7
1 / -0

Why are efforts made to reduce friction?

A
Energy is lost in overcoming friction.

B
Overcoming friction is a time consuming process.

C
Both A and B

D
None of the above

Solution

A lot of the applied energy is lost in overcoming friction so as to put a body in motion. Hence efforts are made to reduce friction.
Question 8
1 / -0

When two surfaces are coated with lubricant, then they will:

A
slide upon each other

B
stick to each other

C
roll upon each other

D
jump on each other

Solution

Lubrication is required to reduce the friction between the two surafces. If two surfaces are coated with lubricant then friction will be reduced so they can slide over each other if one is pushed on the other. It is friction which prevents relative motion between two surfaces.
Question 9
1 / -0

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.

Solution

The nature of the surfaces in contacts decides the friction force between them. The friction force will be more if the surfaces in contact are rougher.
Among the following the $$wet\ marble\ floor$$ is least rough therefore least friction force. Then the increasing order of roughness is $$dry\ marble\ floor, news\ paper$$ and most rough is $$towel$$. Therefore the friction force will also be in same order.
Question 10
1 / -0

The depressions and elevations present on the surface of objects causes friction.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

At the atomic level every surface will have depressions and elevations. When one surface is in contact with one another, the elevations in one surface will set into depressions in the other. The interlocking of two surfaces opposes or hinders or resists the relative motion between the two surface . This resisting force which acts in the opposite direction of the movement is called force of friction. Hence the depressions and elevations present on the surface of objects causes friction.

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Re-Attempt Weekly Quiz Competition

	List I		List II
1	Streamlined body structure	a	Less no. of irregularities
2	Pressing two objects harder against each other	b	Lubricant
3	Grease	c	Increase friction
4	Smooth surface	d	Decrease friction

Friction Test - 25

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Friction Test - 25

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Question 1

1-d, 2-c, 3-b, 4-a

1-d, 2-c, 3-a, 4-b

1-a, 2-d, 3-b, 4-c

1-a, 2-b, 3-c, 4-d

Solution

Question 2

the muzzle tears apart the air layers and suffers more air friction

the muzzle suffers less air friction

the muzzle suffers zero air friction

none of these

Solution

Question 3

b > c > d > a

c > b > d > a

d > b > a > c

a > b > c > d

Solution

Question 4

fluid friction

rolling friction

sliding friction

static friction

Solution

Question 5

friction

lubricant

gravity

heat

Solution

Question 6

Optimum speed is maintained with respect to the air

Metals are choosen in a way to make the aeroplane lighter with smoother surface

Streamlined body inspired by birds

All of the above

Solution

Question 7

Energy is lost in overcoming friction.

Overcoming friction is a time consuming process.

Both A and B

None of the above

Solution

Question 8

slide upon each other

stick to each other

roll upon each other

jump on each other

Solution

Question 9

Wet marble floor, dry marble floor, newspaper and towel.

Newspaper, towel, dry marble floor, wet marble floor.

Towel, newspaper, dry marble floor, wet marble floor.

Wet marble floor, dry marble floor, towel, newspaper.

Solution

Question 10

True

False

Ambiguous

Data insufficient

Solution

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