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Science M.C.Q. [I MARKS]

Force and Pressure · Bihar Board (BSEB) STD 8 (BSEB - English Medium). 235 questions.

Questions · Page 2 of 5

M.C.Q. [I MARKS]

MCQ 511 Mark
Jay and Puneet go to the amusement park to play the pin ball game. The figure shows the extent to which each of them pulls the striker. Which one of the following statements is correct?
  • A
    Jay's ball will move faster because spring of his striker is more elastic.
  • B
    Puneet's ball will move faster because the spring of his striker is more elastic.
  • C
    Jay's ball will move faster because the spring of his striker stores more potential energy.
  • ✓
    Puneet's ball will move faster because the spring of his striker stores more potential energy.
Answer
Correct option: D.
Puneet's ball will move faster because the spring of his striker stores more potential energy.
Since the extension produced in the spring pulled by Puneet is more than that of pulled by Jay. So, spring of his striker stores more potential energy. Thus, Puneet's ball will move faster.
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MCQ 521 Mark
Muscular force is a type of:
  • A
    Gravitational force
  • ✓
    Contact force
  • C
    Non contact force
  • D
    Frictional force
Answer
Correct option: B.
Contact force
Since muscular force can be applied only when it is in contact with an object, hence it is a type of contact force.
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MCQ 531 Mark
Which type of force a person applies while pulling an object?
  • A
    Frictional Force
  • B
    Gravitational Force
  • ✓
    Muscular Force
  • D
    None of the above
Answer
Correct option: C.
Muscular Force
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MCQ 541 Mark
The non$-$contact force is:
  • A
    Magnetic force
  • B
    Electrostatic force
  • C
    Force of gravity
  • ✓
    All of these
Answer
Correct option: D.
All of these
Magnetic force, electrostatic force, force of gravity, all are non$-$contact forces.
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MCQ 551 Mark
A blunt knife does not cut an object easily because:
  • ✓
    Thicker edge produces lesser pressure.
  • B
    The thicker edge does not transfer the force.
  • C
    It can be used to cut the butter.
  • D
    The weight of knife controlled by object.
Answer
Correct option: A.
Thicker edge produces lesser pressure.
A blunt knife does not cut an object easily because due to its thicker edge, the force of our hand falls over a larger area of the object and produces lesser pressure. This lesser pressure cuts the object with difficulty.
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MCQ 561 Mark
Liquids exert pressure on the walls of the container:
  • ✓
    Yes
  • B
    No
  • C
    Can’t say
  • D
    None of these
Answer
Correct option: A.
Yes
Yes, liquids exert pressure on the walls of the container.
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MCQ 571 Mark
When you and your friend pushed heavy table in the same direction, it becomes easier to move. This is because:
  • ✓
    The net force is the sum of forces.
  • B
    The net force is the difference of force.
  • C
    The net force is division of forces.
  • D
    The net force is multiplication of forces.
Answer
Correct option: A.
The net force is the sum of forces.
If two forces act on an object in the same direction, the net force is equal to the sum of the two forces. This always results in a stronger force than either of the individual forces alone.
Hence, the net force is the sum of forces.
$F_{net}= F_1 + F_2$
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MCQ 581 Mark
Figure shows a container filled with water. Which of the following statements is correct about pressure of water?
  • A
    Pressure at $A$ > Pressure at $B$ > Pressure at $C$
  • B
    Pressure at $A$ = Pressure at $B$ = Pressure at $C$
  • C
    Pressure at $A$ < Pressure at $B$ > Pressure at $C$
  • ✓
    Pressure at $A$ < Pressure at $B$ < Pressure at $C$
Answer
Correct option: D.
Pressure at $A$ < Pressure at $B$ < Pressure at $C$

Pressure at $A$ < Pressure at $B$ < Pressure at $C$ because water pressure increases with increase in depth.

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MCQ 591 Mark
Two boys $A$ and $B$ are applying force on a block. If the block moves towards the boy $A,$ which one of the following statements is correct?
  • A
    Magnitude of force applied by $A$ is greater than that of $B.$
  • ✓
    Magnitude of force applied by $A$ is smaller than that of $B.$
  • C
    Net force on the block is towards $B.$
  • D
    Magnitude of force applied by $A$ is equal to that of $B.$
Answer
Correct option: B.
Magnitude of force applied by $A$ is smaller than that of $B.$
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MCQ 601 Mark
The pressure with the height of the liquid column.
  • ✓
    Increase
  • B
    Remains same
  • C
    Decrease
  • D
    None of these
Answer
Correct option: A.
Increase
The pressure increases with the height of the liquid column.
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MCQ 611 Mark
Mark the correct option:
  • A
    The state of motion of an object is described by its speed only.
  • B
    Many a time application of force does not result in a change in the state of motion of an object.
  • C
    By sitting on a bicycle seat force is applied to the spring fixed to the seat of the bicycle.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
The statement in option $A$ is true. The object can be in a state of motion or rest which can be described using its speed. State of rest is just a state of motion with speed zero.
In option $B,$ it is common experience that many a time application of force does not result in a change in the state of motion. For example, a heavy box may not move at all even if you apply the maximum force that you can exert.
The force applied on the spring fixed to the seat of the bicycle is an example of effect of force. The force changes the shape of the object $($spring$).$
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MCQ 621 Mark
A container is filled with water as shown in the given figure. Which of the following statements is correct about pressure of water?
  • A
    Pressure at $A >$ Pressure at $B >$ Pressure at $C$
  • B
    Pressure at $A =$ Pressure at $B =$ Pressure at $C$
  • C
    Pressure at $A <$ Pressure at $B >$ Pressure at $C$
  • ✓
    Pressure at $A <$ Pressure at $B <$ Pressure at $C$
Answer
Correct option: D.
Pressure at $A <$ Pressure at $B <$ Pressure at $C$
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MCQ 631 Mark
The atmospheric pressure is usually measured in the unit of:
  • A
    Newtons per square meter.
  • B
    Pascal.
  • C
    Cm of mercury.
  • ✓
    $Mm$ of mercury.
Answer
Correct option: D.
$Mm$ of mercury.
The level of mercury is measured in $mm.$
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MCQ 641 Mark
The surface area of the base of a brick $X$ is $100\ cm^2.$ The surface area of the base of the brick $Y$ is $250\ cm^2.$ Each brick weighs $100N.$ Which of the following is correct if $P_1$ and $P_2$ are the pressures exerted by the bricks $X$ and $Y$ respectively?
  • A
    $\text{P}_1=\text{P}_2$
  • ✓
    $\text{P}_1>\text{P}_2$
  • C
    $\text{P}_1<\text{P}_2$
  • D
    $\text{P}_1= \text{P}_2=0$
Answer
Correct option: B.
$\text{P}_1>\text{P}_2$
For $X, F_1 = 100N, A_1 = 100\ cm^2$
$\therefore \text{P}_1 = \frac{\text{F}_1}{\text{A}_1}= \frac{100}{100}=1\text{Ncm}^{-2}$
For $Y, F_2=100N, A_2 = 250\ cm^2$
$\therefore \text{P}_2 = \frac{\text{F}_2}{\text{A}_2}= \frac{100}{250}=0.4\text{Ncm}^{-2}$
Hence, $\text{P}_1>\text{P}_2$
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MCQ 651 Mark
The force exerted by the earth to pull the object towards itself is called:
  • A
    Electrostatic force
  • ✓
    Gravitational force
  • C
    Muscular force
  • D
    Contact force
Answer
Correct option: B.
Gravitational force
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MCQ 661 Mark
Pushing a rock from a hill top is an example of:
  • ✓
    Muscular force
  • B
    Magnetic force
  • C
    Frictional force
  • D
    Electrostatic force
Answer
Correct option: A.
Muscular force
Pushing a rock from a hill top is an example of muscular force.
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MCQ 671 Mark
When we press the rubber sucker on a flat, smooth surface. A rubber sucker stays attached firmly to a flat surface due to:
  • A
    Gravity of the earth inside.
  • ✓
    Low atmospheric pressure inside.
  • C
    High atmospheric pressure inside.
  • D
    High electrostatic force creates inside.
Answer
Correct option: B.
Low atmospheric pressure inside.
When we press the rubber sucker on a flat, smooth surface, its concave rubber cup gets flattened to a large extent, pushing out most of the air from beneath it. Since, very little air remains inside the flattened rubber sucker, therefore, the air pressure inside the rubber sucker becomes very low $($and a partial vacuum is created$)$. The much greater atmospheric pressure acting on the rubber sucker from outside fixes the rubber sucker firmly on the flat surface.
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MCQ 681 Mark
If In a tug$-$o$-$war, when two teams are pulling a rope, and the rope does not move towards any team, it implies that.
  • A
    Equal force is being applied in the same direction.
  • ✓
    Equal Force is being applied in opposite direction.
  • C
    No force is applied in any direction.
  • D
    Cannot be explained.
Answer
Correct option: B.
Equal Force is being applied in opposite direction.
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MCQ 691 Mark
There is a magnetic force of repulsion between the like poles of two magnets. Priya is writing some statements, choose the correct statement and help her:
  • A
    The force exerted by a magnet is called magnetic force.
  • B
    There is a magnetic force of repulsion between the like poles of two magnets.
  • C
    There is a magnetic force of attraction between the unlike poles of two magnets.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
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MCQ 701 Mark
Force can also be defined as:
  • A
    Mass per unit volume
  • B
    Distance covered in unit time
  • ✓
    External cause which can change the state of motion
  • D
    None
Answer
Correct option: C.
External cause which can change the state of motion
Force is an external cause which can change the state of rest or motion of a body.
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MCQ 711 Mark
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is:
  • A
    Force of gravity
  • B
    Force of friction
  • ✓
    Electrostatic force
  • D
    Magnetic force
Answer
Correct option: C.
Electrostatic force
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MCQ 721 Mark
Pressure $=$
  • A
    Area / force on which it acts.
  • ✓
    Force / area on which it acts.
  • C
    Volume / force on which it acts.
  • D
    Force / volume on which it acts.
Answer
Correct option: B.
Force / area on which it acts.
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MCQ 731 Mark
Magnetic force is:
  • A
    Contact force
  • ✓
    Non$-$contact force
  • C
    Both $(A)$ and $(B)$
  • D
    None of these
Answer
Correct option: B.
Non$-$contact force
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MCQ 741 Mark
The weight of air that every square centimetre of any surface carries is:
  • ✓
    $1\ kg$
  • B
    $10\ kg$
  • C
    $1\ gm$
  • D
    $100\ kg$
Answer
Correct option: A.
$1\ kg$
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MCQ 751 Mark
A force is applied on an object in the direction of its motion. What is the effect of force on the object?
  • ✓
    The speed of the object will increase.
  • B
    The speed of the object will decrease.
  • C
    The speed of the object will remain unchanged.
  • D
    The object comes to rest
Answer
Correct option: A.
The speed of the object will increase.
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MCQ 761 Mark
The non$-$contact force is:
  • ✓
    force of gravity
  • B
    muscular force
  • C
    force of friction
  • D
    none of these
Answer
Correct option: A.
force of gravity
Force of gravity is non$-$contact force
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MCQ 771 Mark
We are not crushed under the weight of air because:
  • A
    Air has no weight
  • ✓
    The pressure inside our bodies is equal to atmospheric pressure
  • C
    The pressure inside our bodies is more than atmospheric pressure
  • D
    None of these
Answer
Correct option: B.
The pressure inside our bodies is equal to atmospheric pressure
We are not crushed under the weight of air because the pressure inside our bodies is more than atmospheric pressure.
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MCQ 781 Mark
Force of friction always acts on moving objects and its direction shall be$............$
  • A
    On any direction.
  • B
    Along the direction of motion.
  • C
    Perpendicular to the direction of motion.
  • ✓
    Opposite to the direction of motion.
Answer
Correct option: D.
Opposite to the direction of motion.
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MCQ 791 Mark
Which of the following represent correct values for the normal atmospheric pressure?
  • A
    $101.3$ kilopascals and $76mm$ of mercury.
  • B
    $76mm$ of mercury and $101.3$ pascals.
  • ✓
    $101.3$ kilopascals and $76cm$ of mercury.
  • D
    $76mm$ of mercury and $76cm$ of mercury.
Answer
Correct option: C.
$101.3$ kilopascals and $76cm$ of mercury.

Atmospheric pressure is the pressure exerted by the atmosphere, or rather the weight of air above a point on earth. It can be measured using a barometer. The unit of pressure is pascals. As we go to a higher altitude on earth, the weight of air above it decreases, so the pressure will also be lesser. So atmospheric pressure decreases with increasing elevation. Atmospheric pressure is measured using a barometer. At sea level, the barometer will read a value of standard or normal atmospheric pressure, equivalent to the pressure exerted by $760\ mm$ or $76\ cm$, tall column of mercury or $101.3$ kilopascals.

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MCQ 801 Mark
Read the following sentences carefully, and choose the incorrect one:
  • A
    The force exerted by the muscles of the body is called muscular force.
  • B
    The force which always opposes the motion of one body is called friction force.
  • C
    A force which can be exerted by an object on another object on this through physical touching is called contact forces.
  • ✓
    All the above
Answer
Correct option: D.
All the above
Here, all the statements are correct. Hence, your answer will be option $[D].$
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MCQ 811 Mark
The state of motion of an object is described by its $..........$ and the $.........$ of motion.
  • ✓
    Speed, direction
  • B
    Gravity, force
  • C
    Pressure, distance
  • D
    Force, distance
Answer
Correct option: A.
Speed, direction
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MCQ 821 Mark
The magnitude of atmospheric pressure is equal to the pressure exerted by a:
  • A
    $76\ mm$ tall column of mercury.
  • B
    $760\ mm$ tall column of alcohol.
  • ✓
    $76\ cm$ tall column of mercury.
  • D
    $760\ cm$ tall column of mercury.
Answer
Correct option: C.
$76\ cm$ tall column of mercury.

The standard temperature and pressure ($STP$), refers to nominal conditions in the atmosphere at sea level, which supports $760$ millimeters in a mercurial barometer ($760$ mm Hg).

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MCQ 831 Mark
What is net Force?
  • ✓
    Sum of all forces acting on a body.
  • B
    Multiplication of all forces acting on a body.
  • C
    Sum of all balanced forces acting on a body.
  • D
    Sum of all unbalanced forces acting on a body.
Answer
Correct option: A.
Sum of all forces acting on a body.
Sum of all forces whether balanced or unbalanced acting on a body is the net force acting on the body.
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MCQ 841 Mark
In a science quiz competition, payel is asked a question where she had to choose the statement which was/were incorrect?
  • A
    The greater the depth of a point in a liquid, the greater is the pressure.
  • B
    A liquid exerts pressure on the walls of its container.
  • ✓
    The atmospheric pressure is maximum at the high mountain.
  • D
    None of the above.
Answer
Correct option: C.
The atmospheric pressure is maximum at the high mountain.

On the surface of earth, the atmospheric pressure is maximum at the sea level, because the column of air above us is tallest at the sea level. The atmospheric pressure on the surface of earth (at the sea-level) is $101.3$ kilopascals, which is equivalent to the weight of $10$ elephants pressing on each square metre area. As we go up in the atmosphere from the surface of earth, the atmospheric pressure goes on decreasing.

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MCQ 851 Mark
A man walking on the street slips on a banana skin because:
  • A
    It is sticky
  • B
    His foot crushes it
  • ✓
    At that point there is very little friction
  • D
    All of these.
Answer
Correct option: C.
At that point there is very little friction
A man walking on the street slips on a banana skin because at that point there is very little
friction between his shoe and the ground.
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MCQ 861 Mark
Like poles of magnet
  • ✓
    Repels each other
  • B
    Attach with each other
  • C
    Either attract or repels
  • D
    Attract each other
Answer
Correct option: A.
Repels each other
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MCQ 871 Mark
When two forces act in opposite directions, then net force acting is the:
  • A
    Sum of two forces
  • ✓
    Difference between two forces
  • C
    Both of these
  • D
    None of these
Answer
Correct option: B.
Difference between two forces
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MCQ 881 Mark
Two objects repel each other. This repulsion could be due to:
  • A
    Frictional force only
  • B
    Electrostatic force only
  • C
    Magnetic force only
  • ✓
    Either a magnetic or an electrostatic force
Answer
Correct option: D.
Either a magnetic or an electrostatic force
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MCQ 891 Mark
Which of the following is/ are contact forces:
  • A
    Normal force
  • B
    Tension force
  • C
    Friction force
  • ✓
    All
Answer
Correct option: D.
All
Contact forces are those types of forces which result when the two interacting objects are perceived to be physically contacting each other. Examples of contact forces include frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.
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MCQ 901 Mark
A batsman hits the ball for a boundary past the bowler i.e. four runs. The batsman thus.
  • ✓
    Changes the direction $\&$ speed of the ball.
  • B
    Does not change the direction but speed only.
  • C
    Does not change the speed but direction only.
  • D
    Does not change either direction or speed.
Answer
Correct option: A.
Changes the direction $\&$ speed of the ball.
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MCQ 911 Mark
The strength of force is expressed by?
  • A
    Weight
  • B
    Mass
  • ✓
    Magnitude
  • D
    Longitudinal force
Answer
Correct option: C.
Magnitude
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MCQ 921 Mark
Which of the following is not an example of contact force:
  • A
    Muscular force
  • ✓
    Gravitational force
  • C
    Frictional force
  • D
    None
Answer
Correct option: B.
Gravitational force
Contact forces are the forces which result when two interacting bodies are in direct contact with each other.some of the examples are muscular forces,frictional forces,air resistance forces and so on.
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MCQ 931 Mark
A push or pull on an object is called.
  • A
    Pressure
  • B
    Push$-$pull
  • ✓
    Force
  • D
    All of the above
Answer
Correct option: C.
Force
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MCQ 941 Mark
Force that enables us to perform all activities like movement or bending of the body is:
  • A
    Gravitational force
  • B
    Frictional force
  • ✓
    Muscular force
  • D
    Magnetic force
Answer
Correct option: C.
Muscular force
It is the muscular force that enables us to perform all activities involving movement or bending of our body. It is the force resulting due to the action of muscles. Our muscles generate this force by the contraction and relaxation.
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MCQ 951 Mark
What will be the effect of force while squeezing a piece of lemon between the fingers?
  • A
    Change in Speed
  • B
    Change in Direction
  • ✓
    Change in Shape
  • D
    All of the above
Answer
Correct option: C.
Change in Shape
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MCQ 961 Mark
The pressure exerted by the air is known as:
  • A
    Air pressure
  • B
    Gas pressure
  • ✓
    Atmospheric pressure
  • D
    None of these
Answer
Correct option: C.
Atmospheric pressure
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MCQ 971 Mark
If the area over which the force acts decreases, the pressure:
  • ✓
    Increases
  • B
    Decreases
  • C
    Remains the Same
  • D
    None of the above
Answer
Correct option: A.
Increases
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MCQ 981 Mark
Some mustard oil is kept in a beaker. It will exert pressure:
  • A
    Downwards only.
  • B
    Sideways only.
  • C
    Upwards only.
  • ✓
    In all directions.
Answer
Correct option: D.
In all directions.
Fluid exerted pressure in all direction.
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MCQ 991 Mark
Which of the following statement is or are incorrect?
  • A
    A push or pull on an object is called force.
  • B
    When we push the door to open it, then we apply a force on the door in certain direction.
  • C
    An interaction of an object with another object results in a force between the two objects.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
Here, all the statements are correct. Hence, your answer will be option $[D].$
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MCQ 1001 Mark
The force acting on a unit area of a surface is called:
  • A
    Gravity
  • B
    Contact force
  • C
    Non$-$contact force
  • ✓
    Pressure
Answer
Correct option: D.
Pressure
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