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Science M.C.Q. [I MARKS]

Force and Pressure · MP Board (MPBSE) STD 8 (Madhya Pradesh - English Medium). 235 questions.

Questions · Page 4 of 5

M.C.Q. [I MARKS]

MCQ 1511 Mark
Which of the following does not work on the existence of atmospheric pressure?
  • A
    Rise of iodine solution in the glass tube of dropper.
  • B
    Rise of cold drink in a long plastic straw.
  • C
    Sticking of suction hook on the wall of a room.
  • ✓
    Rise of mercury in glass tube of thermometer.
Answer
Correct option: D.
Rise of mercury in glass tube of thermometer.
The rise in the level of mercury in glass tube of thermometer will not work due to the presence of atmospheric pressure. A thermometer works on the principle that mercury expands with increase in temperature. So, the mercury in a glass tube of thermometer will rise only due to increase in temperature.
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MCQ 1521 Mark
Four forces are acting on a body. If the body does not change its position or shape/then what does it mean?
  • A
    Forces are similar acting in the same direction.
  • B
    Forces are parallel and opposite.
  • ✓
    Forces add up to zero when taken as vectors.
  • D
    Forces are different acting in the same direction.
Answer
Correct option: C.
Forces add up to zero when taken as vectors.
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MCQ 1531 Mark
A block of mass $10\ kg$ is suspended through two light spring balances as shown in figure. Then:
  • ✓
    Both the scales will read $10\ kg.$
  • B
    Both the scales will read $5\ kg.$
  • C
    The upper scale will read $10\ kg$ and the lower scale zero.
  • D
    The reading may be anything but their sum will be $10\ kg.$
Answer
Correct option: A.
Both the scales will read $10\ kg.$
Weight of an object is the measure of gravitational force on the object. The force acts on the block whose weight is $10\ kg$ and spring balance measures that force which block produces in spring, so, it is same for both.
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MCQ 1541 Mark
Under which condition can a moving object charge its direction:
  • A
    By reducing friction
  • B
    By increasing friction
  • ✓
    By applying force
  • D
    By not applying force
Answer
Correct option: C.
By applying force
By applying force, a moving object can change its direction.
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MCQ 1561 Mark
The pressure which is exerted by air around us is known as:
  • A
    Force
  • ✓
    Atmospheric pressure
  • C
    Muscular force
  • D
    Friction
Answer
Correct option: B.
Atmospheric pressure
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MCQ 1571 Mark
The same force $“F”$ acts on four different objects having the areas given below, one by one. In which case the pressure exerted will be the maximum?
  • A
    $20m^2$
  • B
    $50m^2$
  • ✓
    $10m^2$
  • D
    $100m^2$
Answer
Correct option: C.
$10m^2$
The force $“F”$ is all the same in all situation making it constant.
Using the formula: pressure = force/ area.
This suggest that since $“F”$ is constant, decrease in area will lead to increase in pressure and vice vasa. This may be represented by a real-life example with a sharp healed shoe of a lady and a normal shoe. If a lady weighing $140N$ may step on you while wearing the sharp healed shoe, the pain will be more severe than while wearing a normal flat shoe. Therefore, the lesser the area, the greater the pressure. Hence, your answer will be $10m^2.$
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MCQ 1581 Mark
A deep sea diver's ears get hurt when he is inside the water. What is the cause for it?
  • A
    Lack of oxygen
  • B
    Decrease in atmospheric pressure
  • ✓
    Increase in water pressure
  • D
    All of the above
Answer
Correct option: C.
Increase in water pressure
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MCQ 1591 Mark
Force changes the
  • A
    Motion of body
  • B
    Speed of body
  • C
    Shape of body
  • ✓
    All of these
Answer
Correct option: D.
All of these
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MCQ 1601 Mark
Which of the following force is utilized in reducing air pollution by removing dust, soot and fly$-$ash particles from the smoke coming out of chimneys of factories?
  • A
    Magnetic force.
  • B
    Gravitational force.
  • C
    Electrostatic force.
  • ✓
    Frictional force.
Answer
Correct option: D.
Frictional force.
An electrostatic precipitator is a type of filter $($dry scrubber$)$ that uses static electricity to remove soot and ash from exhaust fumes before they exit the smokestacks. This one common air pollution control device. Most power stations burn fossil fuels such as coal or oil to generate electricity for use.
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MCQ 1611 Mark
An example of a non$-$contact force is.
  • A
    Force exerted by us to lift a bucket.
  • B
    Push a stationary car.
  • ✓
    Force exerted by magnet.
  • D
    Hit a cricket ball for a $6$ run.
Answer
Correct option: C.
Force exerted by magnet.
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MCQ 1621 Mark
When two forces act in opposite directions, then net force acting two forces.
  • A
    Sum of two factors
  • ✓
    Difference bwteen two factors
  • C
    Both of these
  • D
    None of these
Answer
Correct option: B.
Difference bwteen two factors
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MCQ 1631 Mark
The same force Facts on four different objects having the areas given below, one by one. In which case the pressure exerted will be the maximum?
  • A
    $20m^2$
  • B
    $50m^2$
  • ✓
    $10m^2$
  • D
    $100m^2$
Answer
Correct option: C.
$10m^2$
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MCQ 1641 Mark
Which of the following is not an effect of force?
  • A
    A force can change the speed of a moving object.
  • ✓
    A force can change the direction of a moving object.
  • C
    A force can change the composition of a moving object.
  • D
    A force can change the shape and size of an object.
Answer
Correct option: B.
A force can change the direction of a moving object.
The force can change the direction of motion.
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MCQ 1651 Mark
Which of the following represent correct values for the normal atmospheric pressure?
$A. 101.3$ kilopascals.
$B. 76\ mm$ of mercury.
$C. 101.3$ pascals.
$D. 76\ cm$ of mercury.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $A$ and $D$
  • ✓
    $B$ and $D$
Answer
Correct option: D.
$B$ and $D$
$\text{P}= \frac{\text{F}}{\text{A}}$
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MCQ 1661 Mark
The $SI$ unit of force is:
  • A
    Kilogram
  • B
    Gram
  • ✓
    Newton
  • D
    None of these
Answer
Correct option: C.
Newton

The $SI$ unit of force is Newton.

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MCQ 1671 Mark
Which of the following is not an effect of force?
  • A
    Change in the direction of an object.
  • B
    Change in the shape and size of an object.
  • ✓
    Change in the mass of an object.
  • D
    Change in the position of a stationary object.
Answer
Correct option: C.
Change in the mass of an object.
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MCQ 1681 Mark
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is:
  • A
    Force of gravity.
  • ✓
    Force of friction.
  • C
    Electrostatic force.
  • D
    Magnetic force.
Answer
Correct option: B.
Force of friction.
The electrostatic force is responsible for it, since on combing the hair, the comb and hair get oppositely charged.
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MCQ 1691 Mark
If two forces act in the opposite directions on an object, the net force acting on it is the.
  • A
    Sum of the two forces.
  • ✓
    Difference between the two forces.
  • C
    Multiplication of the two forces.
  • D
    Division of the two forces.
Answer
Correct option: B.
Difference between the two forces.
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MCQ 1701 Mark
Gravity is.
  • A
    Repulsive
  • B
    Attraction $+$ Repulsive force
  • ✓
    Attractive force
  • D
    Not a force
Answer
Correct option: C.
Attractive force
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MCQ 1711 Mark
What is thrust equal to?
  • A
    Force $\times $ area
  • B
    Force / area
  • C
    Pressure
  • ✓
    Pressure $\times $ area
Answer
Correct option: D.
Pressure $\times $ area
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MCQ 1721 Mark
A boat comes to rest if we stop rowing it due to:
  • A
    Gravitation force
  • ✓
    Force of friction
  • C
    Muscular force
  • D
    None of these
Answer
Correct option: B.
Force of friction
A boat comes to rest if we stop rowing it due to force of friction.
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MCQ 1731 Mark
The force exerted by a magnet is an example of a $..........$ force.
  • ✓
    Non$-$contact force
  • B
    Gravitational force
  • C
    Muscular force
  • D
    Contact force
Answer
Correct option: A.
Non$-$contact force
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MCQ 1751 Mark
A ball rolling on the ground slows down and finally stops. This is because of.
  • A
    Force
  • B
    Less force applied
  • ✓
    Friction
  • D
    None of the above
Answer
Correct option: C.
Friction
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MCQ 1761 Mark
In bullocks, horses, camels pulling carts the effort$($force$)$ is caused by:
  • A
    The woody carts.
  • ✓
    The muscles of animals.
  • C
    Muscles of humans.
  • D
    The frictional force between the roads and wheels of the carts.
Answer
Correct option: B.
The muscles of animals.
In our daily life, we push, pull, or lift many things. The force is caused by the action of muscles in our body. We also see animals like bullocks, horses, and camels pulling carts. In these cases, the muscles of animals apply force. This force is called muscular force.
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MCQ 1771 Mark
A brick is kept in three different ways on a table as shown in Figure The pressure exerted by the brick on the table will be:
  • ✓
    Maximum in position $A.$
  • B
    Maximum in position $C.$
  • C
    Maximum in position $B.$
  • D
    Equal in all cases.
Answer
Correct option: A.
Maximum in position $A.$
Pressure will be maximum in position A because area of contact is minimum in this case and area is inversely proportional to pressure.
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MCQ 1781 Mark
The reason we are not crushed under the force of gravity is that the:
  • ✓
    The pressure inside our bodies is also equal to the atmospheric pressure and balances the pressure from outside.
  • B
    The pressure inside our bodies is also equal to the gravitational pressure and balances the pressure from outside.
  • C
    The friction inside our bodies is also equal to the atmospheric pressure and balances the pressure from outside.
  • D
    $A$ and $B.$
Answer
Correct option: A.
The pressure inside our bodies is also equal to the atmospheric pressure and balances the pressure from outside.
The pressure inside our bodies is also equal to the atmospheric pressure and balances the pressure from outside.
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MCQ 1791 Mark
When a rubber sucker is pressed on a plane surface than it sticks to the surface because of :
  • A
    the pressure exerted by us
  • B
    the air sucked by rubber
  • ✓
    the pressure of atmosphere acting on it
  • D
    none of these
Answer
Correct option: C.
the pressure of atmosphere acting on it
A rubber sucker sticks to the plane surface because of the pressure of atmosphere acting on it.
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MCQ 1801 Mark
Which of the following scientists gave the idea of the existence of gravitational force?
  • A
    Einstein
  • B
    James watt
  • C
    Faraday
  • ✓
    Newton
Answer
Correct option: D.
Newton
The english scientist isaac newton had given the idea for gravitational force when he saw an apple fall from a tree. The force with which the earth pulls the objects towards it, is called the force of gravity. Gravity is a natural force of attraction. We are all pulled $($including every object$)$ to the earth by the force of gravity.
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MCQ 1811 Mark
The strength of force is expressed by?
  • A
    Direction
  • ✓
    Magnitude
  • C
    Both
  • D
    None
Answer
Correct option: B.
Magnitude
Force could be larger or smaller than the other.the strength of a force is usually expressed by its magnitude.
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MCQ 1821 Mark
Change of shape and size due to force can be seen by applying force on:
  • A
    A spring.
  • B
    Asponge.
  • C
    An inflated balloon by pressing between the two hands.
  • ✓
    All of these.
Answer
Correct option: D.
All of these.
When a force is applied on a soft object, the shape and size of the object can change. So, for spring, sponge, and inflated balloon, shape and size are changed by application of force.
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MCQ 1831 Mark
The pressure exerted by a liquid:
  • A
    Decreases with depth
  • B
    Does not change with depth
  • ✓
    Increases with depth
  • D
    Is different in different directions at he same depth
Answer
Correct option: C.
Increases with depth
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MCQ 1841 Mark
Match the column $I$ with column $II$ and select the correct option from the codes given below.
  Column I   Column II
$(A)$ A girl pulling the leash of a running dog $(i)$ Impact force can make stationary object to move by an another moving object.
$(B)$ A driver turning the steering wheel of a car $(ii)$ Gravity acts upon an object
$(C)$ When you hit a nail with a hammer $(iii)$ Force can make an object go slower
$(D)$ A ball released from top of a tower $(iv)$ Force can change the direction of a moving object.
  • A
    $(A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)$
  • ✓
    $(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)$
  • C
    $(A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)$
  • D
    $(A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)$
Answer
Correct option: B.
$(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)$

A girl pulling the leash of a running dog makes dog slower. A driver turning the steering wheel of a car is changing the direction of the car. By hitting a nail with a hammer is showing impact force. A ball thrown upwards always comes towards the Earth due to gravity.

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MCQ 1851 Mark
A pressure of $10 kpa$ acts on an area of $0.03m^2.$ The force acting on the area will be:
  • ✓
    $3000n$
  • B
    $30n$
  • C
    $3n$
  • D
    $300n$
Answer
Correct option: A.
$3000n$
A.  $3000n$
Explanation:
We can calculate pressure using the formula, pressure = force/ area.
In this case, pressure $= 10 kpa = 10 \times 1000 = 10000 pa$ and area =$0.3m^2$
So, we can find force as follows:
$Force = pressure \times area = 10000 × 0.3 = 3000$ newtons.
So, a force of $3000n$ is required to create a pressure of $10$ kpa for an object of area $0.3m^2$
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MCQ 1861 Mark
Which of the following are contact forces?
$A.$ Friction.
$B.$ Gravitational force.
$C.$ Magnetic force.
$D.$ Muscular force.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • ✓
    $A$ and $D$
  • D
    $B$ and $D$
Answer
Correct option: C.
$A$ and $D$
Force applied when it is in contact with the object.
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MCQ 1871 Mark
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is:
  • A
    Force of gravity.
  • ✓
    Electrostatic force.
  • C
    Force of friction.
  • D
    Magnetic force
Answer
Correct option: B.
Electrostatic force.
The electrostatic force is responsible for it, since on comparing the hair, the comb and hair get oppositely charged.
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MCQ 1881 Mark
The below figures show the forces required to move a $100g$ object over different surfaces. The friction is greatest at:
  • ✓
    Surface $P$
  • B
    Surface $Q$
  • C
    Surface $R$
  • D
    Surface $S$
Answer
Correct option: A.
Surface $P$

The force required to move a $100g$ mass on surface $P$ is maximum. This means surface $P$ offers maximum friction.

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MCQ 1891 Mark
A stone thrown with a catapult $($Gulal$)$ falls back on the ground because :
  • A
    The muscles apply force
  • B
    The stone applies force
  • ✓
    The earth exerts force
  • D
    The catapult exerts force
Answer
Correct option: C.
The earth exerts force
A stone thrown with a catapult $($Gulal$)$ falls back on the ground because the earth exerts force
on it
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MCQ 1901 Mark
Force per unit area is called $..........$
  • A
    Motion
  • B
    Gravity
  • ✓
    Pressure
  • D
    Friction
Answer
Correct option: C.
Pressure
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MCQ 1911 Mark
Which of the following change appreciably when a batsman hits a moving cricket ball?
  • A
    Shape and direction.
  • B
    Direction and size.
  • C
    Shape and size.
  • ✓
    Direction and speed.
Answer
Correct option: D.
Direction and speed.
A force can change the speed of a moving object. A force can change the direction of a moving object. A force can change the composition of a moving object. A force can change the shape and size of an object. But when a batsman hits a moving cricket ball, its direction and speed changed, not shape and size.
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MCQ 1921 Mark
Fill in the blank.
A rubber balloon $.............$ when the molecules of air exert force on its walls.
  • ✓
    Expands
  • B
    Contracts
  • C
    No change in dimension is seen
  • D
    All of the above
Answer
Correct option: A.
Expands
Force can bring change in dimension.A rubber balloon expands when the molecules of air exert force on its walls.
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MCQ 1931 Mark
The pressure of the water at the bottom of the pond is $...........$ at the surface of the pond.
  • A
    Lower than
  • ✓
    Higher than.
  • C
    Same
  • D
    Either lower or higher.
Answer
Correct option: B.
Higher than.
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MCQ 1941 Mark
In the electric bell circuit, when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of hammer?
  • A
    Gravitational force alone
  • B
    Electrostatic force alone
  • ✓
    Magnetic force alone
  • D
    Frictional force alone
Answer
Correct option: C.
Magnetic force alone
It will be magnetic force because as electric current flows through the coil, it behaves like electromagnet and magnetic force is created.
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MCQ 1951 Mark
The force exerted by a charged body on another char:
  • A
    Gravitational force
  • ✓
    Electrostatic force
  • C
    Non$-$contact force
  • D
    Contact force
Answer
Correct option: B.
Electrostatic force
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MCQ 1961 Mark
A rectangular wooden block has length, breadth and height of $50\ cm, 25\ cm$ and $10\ cm$, respectively. This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground?
  • A
    The maximum pressure is exerted when the length and breadth form the base.
  • B
    The maximum pressure is exerted when length and height form the base.
  • ✓
    The maximum pressure is exerted when breadth and height form the base.
  • D
    The minimum pressure is exerted when length and height form the base.
Answer
Correct option: C.
The maximum pressure is exerted when breadth and height form the base.

As we know that pressure exerted by the body is inversely proportional to the area where force is applied. So, which has less area of cross section in contact with the surface will exert more pressure on the ground. It is clear that height from the base exerts more pressure. Therefore, the maximum pressure is exerted when length and height form the base.

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MCQ 1971 Mark
The unit of pressure is:
  • A
    Newton
  • ✓
    Newton/metres
  • C
    Newton metres
  • D
    Newton/metre
Answer
Correct option: B.
Newton/metres
The unit of pressure is Newton/metres.
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MCQ 1981 Mark
A water tank has four taps fixed at points $A, B, C, D$ as shown in Figure The water will flow out at the same pressure from taps at:
  • ✓
    $B$ and $C$
  • B
    $C$ and $D$
  • C
    $A$ and $B$
  • D
    $A$ and $C$
Answer
Correct option: A.
$B$ and $C$

Since, $B$ and $C$ are at the same level. So, the pressure will remain same at $B$ and $C$.

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MCQ 1991 Mark
How does the pressure exerted by a liquid change?
  • ✓
    Increases with depth
  • B
    Decreases with depth
  • C
    Remains constant
  • D
    First increases and then decreases
Answer
Correct option: A.
Increases with depth
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MCQ 2001 Mark
Which of the following is not a non$-$contact force?
  • A
    Electrostatic force.
  • ✓
    Gravitational force.
  • C
    Frictional force.
  • D
    Magnetic force.
Answer
Correct option: B.
Gravitational force.
Friction force is an example of contact force.
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