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Science M.C.Q. [I MARKS]

Friction · Bihar Board (BSEB) STD 8 (BSEB - English Medium). 221 questions.

Questions · Page 4 of 5

M.C.Q. [I MARKS]

MCQ 1511 Mark
Burning of the meteor in the atmosphere is due to:
  • A
    Electrostatic force
  • B
    Magnetic force
  • ✓
    Frictional force
  • D
    Gravitational force
Answer
Correct option: C.
Frictional force
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MCQ 1521 Mark
Consider the following statements and choose the incorrect one:
  • A
    The burning of a matchstick would not be possible without friction.
  • B
    We are able to cut wood because there is friction between the saw blade and log of wood.
  • C
    We can hold a glass tumbler in our hands because of friction between the glass tumbler and our hands.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
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MCQ 1531 Mark
Which of the following activities will produce the least amount of frictional force?
  • A
    Walking
  • B
    Running
  • ✓
    Ice$-$skating
  • D
    Rowing a boat
Answer
Correct option: C.
Ice$-$skating
Ice offers the least friction as compared to water and road surfaces.
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MCQ 1541 Mark
Rolling friction is smaller than?
  • A
    Sliding friction
  • B
    Static friction
  • C
    Fluid friction
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
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MCQ 1551 Mark
If we apply oil on door hinges, the friction will.
  • A
    Increase
  • ✓
    Decrease
  • C
    Disappear altogether.
  • D
    Will remain unchanged.
Answer
Correct option: B.
Decrease
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MCQ 1561 Mark
Which of the following actions does not increase friction?
  • A
    Threading tires.
  • B
    Grinding on stones.
  • C
    Making spikes on shoes.
  • ✓
    Powdering a carom board.
Answer
Correct option: D.
Powdering a carom board.
The friction of a surface is increased by increasing its roughness. The roughness of a carom board does not increase when it is powdered. Hence, the friction of a carom board surface does not increase when it is powdered.
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MCQ 1571 Mark
When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts.
  • ✓
    In the backward direction on the front wheel and in the forward direction on the rear wheel.
  • B
    In the forward direction on the front wheel and in the backward direction on the rear wheel.
  • C
    In the forward direction on both front and the rear wheels.
  • D
    None of these.
Answer
Correct option: A.
In the backward direction on the front wheel and in the forward direction on the rear wheel.
The rear wheel moves by the force I communicated to it by pedalling while front wheel I moves by itself. So, when pedalling a bicycle, the force exerted by the rear wheel on ground makes the force of friction act on it in the forward direction.
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MCQ 1581 Mark
In the decreasing order of magnitude, which of the following is correct?
  • A
    Rolling $ < $ static $ < $ sliding friction
  • ✓
    Static $ > $ sliding $ > $ rolling friction
  • C
    Static $ > $ rolling $ > $ sliding friction
  • D
    Sliding $ < $ static $ < $ rolling friction
Answer
Correct option: B.
Static $ > $ sliding $ > $ rolling friction
For the given surfaces static friction is somewhat greater than sliding friction as well as$-$rolling friction. It is easier to roll than to slide. Hence, sliding friction is greater than rolling friction. The decreasing order of magnitude of friction is static, sliding and rolling.
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MCQ 1591 Mark
Friction is a $...........$
  • ✓
    Contact force
  • B
    Non$-$contact force
  • C
    Magnetic force
  • D
    None of these
Answer
Correct option: A.
Contact force
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MCQ 1601 Mark
Tyres are treaded to.
  • A
    Look good.
  • ✓
    Increase friction.
  • C
    Increase its longivity
  • D
    Increase weight of the tyre.
Answer
Correct option: B.
Increase friction.
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MCQ 1611 Mark
The given figure shows three identical carom boards labeled $I, II$, and $III.$ Sand particles have been poured on board $I$ and oil has been poured on board $II.$

Equal forces are applied on three identical pucks on the three carom boards such that their speeds on the three carom boards are $v_1$, $v_2$ and $v_3$ respectively. The relation among the speeds of the pucks on the three carom boards is.
  • A
    $V_1>V_3>V_2$
  • ✓
    $V_1
  • C
    $V_1>V_2>V_3$
  • D
    $V _1< V _2< V _3$
Answer
Correct option: B.
$V_1
The speed of a puck is inversely proportional to the magnitude of the frictional force acting between it and the surface of the carom board. Since the presence of sand increases the force of friction between the board and the puck, the speed of the puck on board $III$ i.e., $v _3$ will be greater than the speed of the puck on board I i.e., $v _1$. The oil poured on carom board $II$ decreases the force of friction between the board and the puck.
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MCQ 1621 Mark
Olivia pushes a toy car on a rough surface. The toy car travels $4 m$ before stopping. The distance travelled by the toy car can be increased by.
  • A
    Loading the toy car with a stone.
  • B
    Removing the wheels of the toy car.
  • C
    Pushing the toy car with less force.
  • ✓
    Pushing the toy car on a smooth surface.
Answer
Correct option: D.
Pushing the toy car on a smooth surface.
Pushing the toy car on a smooth surface will reduce the friction between the wheels of the car and the surface. This will increase the distance covered by the toy car, as compared to the distance covered by it on the rough surface.
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MCQ 1631 Mark
To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
  • ✓
    Stone
  • B
    Plastic block
  • C
    Wooden block
  • D
    Glass block
Answer
Correct option: A.
Stone
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MCQ 1641 Mark
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest.
  • A
    Spread a carpet on the wooden surface.
  • B
    Cover the ball with a piece of cloth.
  • ✓
    Sprinkle talcum powder on the wooden surface.
  • D
    Sprinkle sand on the wooden surface.
Answer
Correct option: C.
Sprinkle talcum powder on the wooden surface.
Talcum powder reduces friction force and the ball will cover longer distance.
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MCQ 1651 Mark
Which of the following statements is incorrect?
  • A
    Static friction is greater than rolling friction.
  • B
    Sliding friction is less than rolling friction.
  • C
    Rolling friction is less than static friction.
  • ✓
    Static friction is greater than sliding friction.
Answer
Correct option: D.
Static friction is greater than sliding friction.
The static friction $ > $ Sliding Friction $ > $ Rolling friction.
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MCQ 1661 Mark
Why are the head of a match stick and the sides of a match box deliberately made rough?
  • ✓
    To increase friction.
  • B
    To decrease friction.
  • C
    To increase the amount of heat.
  • D
    To decrease the amount of heat.
Answer
Correct option: A.
To increase friction.
Due to increased friction, greater frictional heat is produced in the match stick which thus lights up easily.
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MCQ 1671 Mark
Static friction is $...........$ than rolling friction and rolling friction is $...........$ than sliding friction.
  • A
    More, less
  • ✓
    Less, more
  • C
    Equal
  • D
    None of these
Answer
Correct option: B.
Less, more
Static friction is always greater than kinetic friction. Sliding and rolling frictions are types of kinetic friction. Hence, static friction is greater than rolling friction. In sliding, the motion is opposed to the friction of the surface, more than that opposed in rolling friction. Hence, rolling friction is less than sliding friction. Hence, Static friction > Sliding friction > Rolling friction.
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MCQ 1681 Mark
Which force among the following is a contact force:
  • A
    Magnetic
  • B
    Electrostatic
  • C
    Gravitational
  • ✓
    Frictional
Answer
Correct option: D.
Frictional
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MCQ 1691 Mark
Smooth surface has:
  • ✓
    Less friction.
  • B
    More friction.
  • C
    Sometimes less and sometimes more.
  • D
    All of these.
Answer
Correct option: A.
Less friction.
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MCQ 1701 Mark
Lubricants $..........$
  • A
    Increase friction
  • ✓
    Reduce friction
  • C
    Both $(a)$ and $(b)$
  • D
    None
Answer
Correct option: B.
Reduce friction
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MCQ 1711 Mark
Why are spikes provided in the shoes of athletes?
  • A
    As a decoration.
  • ✓
    To increase friction.
  • C
    To decrease friction.
  • D
    To give shape.
Answer
Correct option: B.
To increase friction.
Spikes in the shoes increase friction and prevent slipping.
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MCQ 1721 Mark
When the applied force is doubled on an object and the object is still at rest, then friction becomes.
  • ✓
    Doubled
  • B
    Halved
  • C
    Quadrupled
  • D
    Zero.
Answer
Correct option: A.
Doubled
The force of static friction depends upon the applied force and the nature of the surface in contact. More is the applied force, more will be the force of static friction.
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MCQ 1731 Mark
To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
  • ✓
    Stone.
  • B
    Wooden block.
  • C
    Plastic block.
  • D
    Glass block.
Answer
Correct option: A.
Stone.
Stone will be more suitable because it will exert greater reaction and hence greater friction force which sharpen the blade of a knife easily by rubbing.
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MCQ 1741 Mark
A matchstick struck on a matchbox catches fire easily because.
  • ✓
    Friction may cause fire.
  • B
    Of chemical reaction.
  • C
    Force heated the match stick.
  • D
    None of the above.
Answer
Correct option: A.
Friction may cause fire.
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MCQ 1751 Mark
Which of the following is a disadvantage of friction?
  • A
    It enables the brakes of a car to work.
  • B
    It allows us to hold a pen.
  • C
    It helps us to sandpaper a table.
  • ✓
    It wears out our shoes.
Answer
Correct option: D.
It wears out our shoes.
The wearing out of the soles of shoes is a disadvantage of friction.
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MCQ 1761 Mark
Observe the given activity. What do you conclude from this?
  • A
    The frictional force depends on the nature of the two surfaces in contact.
  • ✓
    Frictional force increases as mass increases.
  • C
    Rolling friction is less than sliding friction.
  • D
    Frictional force is muscular force.
Answer
Correct option: B.
Frictional force increases as mass increases.
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MCQ 1771 Mark
Force of friction depends on:
  • A
    Roughness of surface.
  • B
    Smoothness of surface.
  • C
    Inclination of surface.
  • ✓
    All of these.
Answer
Correct option: D.
All of these.
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MCQ 1781 Mark
Why do the soles of our shoes easily wear out?
  • A
    Due to the difference in the material of the sole.
  • B
    Due to poor design.
  • ✓
    Due to friction.
  • D
    Due to their size.
Answer
Correct option: C.
Due to friction.
When we walk on the road, the friction between the soles of our shoes and the road wears out the soles.
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MCQ 1791 Mark
While walking on ice one should take small steps to avoid slipping. This is because smaller steps ensure.
  • ✓
    Large friction.
  • B
    Smaller friction.
  • C
    Large normal force.
  • D
    Small normal force.
Answer
Correct option: A.
Large friction.
Because smaller steps ensure larger friction.
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MCQ 1801 Mark
Fluids are:
  • A
    Liquids
  • B
    Gases
  • ✓
    Both $(a)$ and $(b)$
  • D
    None of these
Answer
Correct option: C.
Both $(a)$ and $(b)$
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MCQ 1811 Mark
Which of the following materials is likely to have the least friction?
  • A
    Wood
  • B
    Cardboard
  • ✓
    Glass
  • D
    Paper
Answer
Correct option: C.
Glass
Glass has comparatively a better polished and regular surface and so, it has the least friction.
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MCQ 1821 Mark
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.
  • ✓
    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
Correct option: A.
Wet marble floor, dry marble floor, newspaper and towel.
Wet marble floor, dry marble floor, newspaper and towel Force of friction depends on the nature of surfaces in contact. The rougher the surface, the more is the friction between the surfaces in contact and vice-versa. Roughness present in the given surfaces can be arranged in an ascending order as wet marble floor, dry marble floor, newspaper and towel. Hence, the correct sequence of these surfaces when arranged according to the increase in the force of friction acting on the car is wet marble floor, dry marble floor, newspaper and towel.
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MCQ 1831 Mark
Friction always acts $...........$ the direction of motion of an object.
  • A
    In the same direction as
  • B
    Perpendicular to
  • ✓
    Opposite to
  • D
    It $45$ degrees angle to
Answer
Correct option: C.
Opposite to
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MCQ 1841 Mark
Why is it harder to start to slide a heavy box across the floor than to keep it sliding?
  • ✓
    Static friction is greater than kinetic friction.
  • B
    Kinetic friction is greater than the static friction.
  • C
    Sliding friction is less than rolling friction.
  • D
    None.
Answer
Correct option: A.
Static friction is greater than kinetic friction.
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MCQ 1851 Mark
Two boxes, having the same weight, are kept between two vertical walls. Calvin lifts one of the boxes $($against the pull of gravitational force$)$ with the help of a rope. Before lifting the second box, he lubricates the vertical walls with oil. As a result, he has to apply less force to lift the second box. Which force is reduced as a result of the lubrication of the walls?
  • A
    Gravitational
  • ✓
    Compressive
  • C
    Frictional
  • D
    Magnetic
Answer
Correct option: B.
Compressive
The given boxes are kept between two vertical walls. When the first box is pulled upward along the walls, frictional force acts between the surfaces of the box and the walls, in the downward direction. When the walls are lubricated with oil, this frictional force is reduced. Oil eliminates the roughness $($as a result of friction$)$ between the surfaces of the box and the walls. This allows the box to slide over with minimum friction. Hence, Calvin had to apply less force to lift the second box.
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MCQ 1861 Mark
Ted learns about force of friction and tries out different ways of reducing as well as increasing the friction on the surface of his driveway. In order to reduce the friction on the surface of the drive way, Ted should.
  • A
    Cover it with small pebbles.
  • B
    Cover it with sand.
  • C
    Spread grit on it.
  • ✓
    Pour oil on it.
Answer
Correct option: D.
Pour oil on it.
In order to reduce the friction on the surface of his driveway, Ted should make its surface very smooth. He should do so because frictional forces become very weak on smooth surfaces. Hence, in order to reduce the friction on the surface of his driveway, Ted should pour oil it.
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MCQ 1881 Mark
If the force of friction were not to exist, then it would be almost impossible to both.
  • A
    Speak and listen.
  • ✓
    Write and walk.
  • C
    Speak and walk.
  • D
    Write and listen.
Answer
Correct option: B.
Write and walk.
Friction is an important aspect of life. We are able to walk on a surface because of the presence of friction between the ground surface and our feet. If friction were to become zero, then the act of walking would become impossible, causing us to slip and fall. One is able to write on a surface $($for example, a blackboard$)$ only if friction is present on the surface. We are able to write on a blackboard because of the presence of friction between the board and the chalk.
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MCQ 1891 Mark
Which of the following does not have a streamlined shape?
  • A
    Aeroplane.
  • B
    Boat.
  • C
    Bird.
  • ✓
    Bus.
Answer
Correct option: D.
Bus.
Bus is not streamlined shape. It is a cuboid shape.
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MCQ 1901 Mark
Joe slides a plank of wood over the floor. As the wood plank slides over the floor, its speed can be increased the most if.
  • A
    The floor is lubricated.
  • ✓
    It is coated with oil.
  • C
    Balls are placed under it.
  • D
    It is smoothed with sand paper.
Answer
Correct option: B.
It is coated with oil.
In order to answer this question successfully, the student must understand that when balls are placed under the plank of wood, it rolls instead of sliding. Hence, its friction is the least and its speed increases the most.
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MCQ 1911 Mark
A man sharpens his knife as shown in the figure. Which of the properties of friction are in use?

$i.$ Friction helps us to hold objects.
$ii.$ Friction acts in the opposite direction of motion.
$iii.$ Friction causes the surfaces in contact to wear away.
$iv.$ Friction produces heat energy.
  • A
    $(i)$ and $(ii)$
  • B
    $(i), (iii)$ and $(iv)$
  • ✓
    $(iii)$ and $(iv)$
  • D
    All $(i), (ii), (iii)$ and $(iv)$
Answer
Correct option: C.
$(iii)$ and $(iv)$
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MCQ 1921 Mark
Luis throws four stones having the same weight on four different surfaces. The surfaces are icy, dry, sandy, and cemented. He throws each stone with the same force. On which of the given surfaces will the stone go the maximum distance before it stops?
  • ✓
    Icy surface.
  • B
    Dry surface.
  • C
    Sandy surface.
  • D
    Cemented surface.
Answer
Correct option: A.
Icy surface.
The stone will go the maximum distance on the surface that has the least friction. An icy surface has the least friction among the given surfaces. Hence, before stopping, the stone will go the maximum distance on the icy surface.
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MCQ 1931 Mark
Which of the following activities will not be possible in the absence of friction?
  • A
    Holding a glass.
  • B
    Writing on a paper.
  • C
    Sitting on a chair.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
Holding a glass, writing on a paper and sitting on a chair are the activities which are not possible without friction.
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MCQ 1941 Mark
The force of friction decreases with ____$i$___ in interlocking between the surfaces in contact and it increases with ____$ii$____ in the pressing force between the surfaces. The information in which alternative completes the given statement?
  • A
    i-an increase, ii-an increase.
  • ✓
    i-a decrease, ii-an increase.
  • C
    i-an increase, ii-a decrease.
  • D
    i-a decrease, ii-a decrease.
Answer
Correct option: B.
i-a decrease, ii-an increase.

Force of friction occurs because of irregularities present on material surfaces. When two surfaces are in contact, interlocking occurs between the surfaces. Greater the interlocking between the surfaces, greater is the force required to overcome the interlocking. Hence, force of friction decreases with a decrease in interlocking between the surfaces. Also, greater the pressing force, greater is the interlocking between the surfaces. Hence, force of friction increases with an increase in the pressing force between the surfaces.

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MCQ 1951 Mark
Which of the following is not an advantage of fiction?
  • A
    It enables drawing to be made on paper.
  • B
    It enables fallen things to be picked up.
  • ✓
    It enables rubber pads to be rubbed off.
  • D
    It enables vehicles to move on ground.
Answer
Correct option: C.
It enables rubber pads to be rubbed off.
There are many advantages and disadvantages of friction force. Here, all are the advantages mentioned in all options, except one i.e., option $[c].$ Friction enables rubber pads to be rubbed off, the tyres of vehicles wear out gradually, soles of our shoes tear out, brake pads of vehicles rubbed off also.
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MCQ 1961 Mark
In a cycling race, it is observed that a cyclist normally bends his body forward $($as shown in the given figure$).$

The cyclist bends in order to
  • A
    Feel comfortable.
  • B
    Reduce his weight.
  • ✓
    Reduce the air drag.
  • D
    Increase energy consumptionlution.
Answer
Correct option: C.
Reduce the air drag.
When an object moves through air, its motion is opposed by air or wind resistance known as drag. This eventually results in consumption of more energy of the cyclist to sustain a constant speed. During a cycling race, the cyclist bends his body forward to make the system streamlined to reduce the air drag $($as shown in the given figure$).$

This is possible as most of the air flows past smoothly through the cyclists streamlined shape. Hence, less energy is required to move or maintain high speed.
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MCQ 1971 Mark
John pushes a table with wheels under it. At the same time, Abraham pushes a table without any wheels under it. Both the tables weigh the same. The two tables move at the same speed, but John applies lesser force than Abraham.

Which force is reduced by the wheels under John's table?
  • A
    Magnetic
  • ✓
    Frictional
  • C
    Electrostatic
  • D
    Gravitational
Answer
Correct option: B.
Frictional
Frictional force always opposes the motion of a body. This force can be reduced by using wheels under the moving body. Wheels under John?s table reduce the surface of contact between the floor and the table. As a result, frictional force between the table and the floor decreases.
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MCQ 1981 Mark
To every action there is always an equal and opposite reaction. Which of the following statements is correct regarding this?
  • ✓
    The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless.
  • B
    The horse pulls the buggy forward slightly harder than the buggy pulls the horse backward, so they move forward.
  • C
    The horse can pull the buggy forward only if the horse weighs more than the buggy.
  • D
    None of these.
Answer
Correct option: A.
The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless.
The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless.
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MCQ 1991 Mark
Which one of these characteristics does a smooth surface has?
  • ✓
    Less frictional force
  • B
    More frictional force
  • C
    Sometimes less and sometimes more force
  • D
    All of above
Answer
Correct option: A.
Less frictional force
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MCQ 2001 Mark
Which of the following mechanical systems will produce the maximum amount of heat because of friction?
  • ✓
  • B
  • C
  • D
Answer
Correct option: A.
In this alternative, the box and the surface are in direct contact with each other. Therefore, this system has the maximum frictional force between the box and the surface. As a result, this system will generate the maximum amount heat because of friction. The correct answer is $A.$ Why alternatives $B, C$ and $D$ are wrong: The amount of rolling friction is always less when compared to static friction. Hence, the heat generated because of friction by the systems shown in alternatives $B$ and $C$ will be less as compared to the heat generated because of friction by the system shown in alternative $A$. In the system shown in alternative $D$, the surface is covered by a thin layer of oil. The box will slide over this layer. As a result, the friction between the box and the surface will become reduced. Hence, the heat generated in this case will be less.
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M.C.Q. [I MARKS] - Page 4 - Science STD 8 Questions - Vidyadip