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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 3 of 5

M.C.Q. [I MARKS]

MCQ 1011 Mark
When we press the bulb of a dropper with its nozzle kept in water air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to:
  • A
    Pressure of water.
  • B
    Gravity of the earth.
  • C
    Shape of rubber bulb.
  • ✓
    Atmospheric pressure.
Answer
Correct option: D.
Atmospheric pressure.
Atmospheric pressure exerted by air.
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MCQ 1021 Mark
When a given force is applied on larger area of contact the pressure exerted by it:
  • A
    Increases
  • ✓
    Decreases
  • C
    Does not change
  • D
    None of these
Answer
Correct option: B.
Decreases
When a given force is applied on larger area of contact than the pressure exerted by it decreases.
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MCQ 1031 Mark
Two boys $A$ (left side) and $B$ (right side) are applying force on a block. If the block moves towards the right, which one of the following statements is correct?
  • ✓
    Magnitude of force applied by $A$ is greater than that of $B.$
  • B
    Magnitude of force applied by $A$ is smaller than that of $B.$
  • C
    Net force on the block is towards $A$.
  • D
    Magnitude of force applied by $A$ is equal to that of $B.$
Answer
Correct option: A.
Magnitude of force applied by $A$ is greater than that of $B.$
Magnitude of force applied by $A$ is greater than that of $B$ because the block moves towards right i.e., towards $B.$
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MCQ 1041 Mark
Which of the following change appreciably when a batsman hits a moving cricket ball?
$A.$ Shape.
$B.$ Direction.
$C.$ Size.
$D.$ Speed.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $A$ and $C$
  • ✓
    $B$ and $D$
Answer
Correct option: D.
$B$ and $D$
The force can change the direction and Speed of motion.
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MCQ 1051 Mark
The ratio of force, acting perpendicular to the area, on which it acts is known as $...........$
  • A
    Force
  • B
    Friction
  • ✓
    Presuure
  • D
    Density
Answer
Correct option: C.
Presuure
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MCQ 1061 Mark
A force can produce many effects. Choose the correct statements:
  • A
    A force can change the speed of a moving object.
  • B
    A force can change the direction of a moving object.
  • C
    A force can change the shape and size of an object.
  • ✓
    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 1071 Mark
In the last year board examination, rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?
  • A
    The drinking straw works on the existence of atmospheric pressure.
  • B
    The syringe works on the existence of atmospheric pressure.
  • C
    A dropper works on the existence of atmospheric pressure.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
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MCQ 1081 Mark
The speed of moving ball increase further if force is applied in
  • A
    Opposite to direction of motion
  • B
    Parallel to direction of motion
  • ✓
    Direction of motion
  • D
    Perpendicular to direction of motion
Answer
Correct option: C.
Direction of motion
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MCQ 1091 Mark
Which of the following is a non$-$contact force?
  • A
    Muscular force
  • ✓
    Electrostatic force
  • C
    Elastic spring force
  • D
    Frictional force
Answer
Correct option: B.
Electrostatic force
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MCQ 1101 Mark
As we go higher up on mountains, our ears pop because:
  • A
    Air pressure around our ears increases.
  • B
    The pressure exerted by the blood near ears increases.
  • ✓
    Air pressure around our ears decreases.
  • D
    None of these.
Answer
Correct option: C.
Air pressure around our ears decreases.
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MCQ 1111 Mark
The diagram shows an object hanging from a string. Which of the following is the correct statement about the diagram?
  • A
    The object does not fall because there is no gravity.
  • B
    The object does not fall because there is friction between the object and the string.
  • C
    The object does not fall because a magnetic force is acting on it.
  • ✓
    The object does not fall because the string is exerting a force against the Earth's gravity.
Answer
Correct option: D.
The object does not fall because the string is exerting a force against the Earth's gravity.
The object does not fall because the force exerted by the string, balances the Earth's gravity and net effect of the force on the object is zero.
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MCQ 1121 Mark
Which of the following is not an example of the force of gravity?
  • A
    A leaf falling from a tree.
  • ✓
    A boy pushing a cart on a level plane.
  • C
    A diver jumping into a swimming pool.
  • D
    A stone falling from the top of a cliff.
Answer
Correct option: B.
A boy pushing a cart on a level plane.
All are the examples of gravity force except one. A boy pushing a cart on a level plane is an example of contact forces. Remember, forces are used in our everyday actions like pulling, pushing, lifting, stretching, pressing and so on.
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MCQ 1131 Mark
By decreasing the contact area the pressure:
  • A
    Is decreased
  • B
    Remain same
  • ✓
    Is increased
  • D
    one of these
Answer
Correct option: C.
Is increased
By decreasing the contact area the pressure is increased.
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MCQ 1141 Mark
A brick is kept in three different ways on a table as shown in given 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 $A$
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MCQ 1151 Mark
Which of the following actions describe pushing force?
  • ✓
    Kicking
  • B
    Lifting
  • C
    Picking
  • D
    Opening
Answer
Correct option: A.
Kicking
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MCQ 1161 Mark
Which of the following is proper example(s) to explain that force on an object may change its shape.
  • A
    A ball of dough rolled into chapati.
  • B
    Pressing a rubber ball kept on table.
  • C
    Making model using clay.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
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MCQ 1171 Mark
Contact forces:
  • A
    Are action at a distance forces.
  • B
    Ex$-$gravitational forces.
  • ✓
    Act when the bodies are in physical contact with other.
  • D
    All.
Answer
Correct option: C.
Act when the bodies are in physical contact with other.
A contact force is any force that requires contact to occur. Contact forces are ubiquitous and are responsible for the most visible interactions between macroscopic collections of matter. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.
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MCQ 1181 Mark
Choose the incorrect statement$(s).$
  • A
    Length of a rubber band increases,when a stretching force is applied.
  • B
    A spring shortens in length on the application of a compressive force.
  • C
    Gold on hammering flattens to form a thin leaf.
  • ✓
    None of these.
Answer
Correct option: D.
None of these.
Force is an external agent $($push or pull$)$ which can change the state of motion or the state of the rest of an object.
Force can also bring change in dimensions and all the above options are its examples.
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MCQ 1191 Mark
In the game of cricket, the stumps fall when the ball strikes them. This is an example of:
  • ✓
    Contact force
  • B
    Non contact force
  • C
    Displacement force
  • D
    None
Answer
Correct option: A.
Contact force
The contact forces represent the result of physical contact between two objects, one by which force is exerted and the other by which force is exerted.
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MCQ 1201 Mark
If force is applied on the body in the direction of motion then:
  • ✓
    Speed of the body will increase.
  • B
    Speed of the body will decrease.
  • C
    Speed of the body will not change at all.
  • D
    All the options are possible.
Answer
Correct option: A.
Speed of the body will increase.
If applied force acts on a body in the direction of motion,the speed of the body will increase.
If the direction of force on the body is opposite to the direction of motion, the speed will decrease.
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MCQ 1211 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.
Newton propound the universal laws of gravitational.
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MCQ 1221 Mark
Which of the following is contact force:
  • A
    Force of gravity
  • B
    Magnetic force
  • ✓
    Force of friction
  • D
    Electrostatic force
Answer
Correct option: C.
Force of friction
Force of friction is contact force.
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MCQ 1231 Mark
Which of the following statements are true?
$i.$ An object will continue moving uniformly until the resultant force on it is zero.
$ii.$ The bodies do not change their state of rest or motion unless acted upon by an unbalanced external force.
$iii.$ If a body is at rest on the surface of the Earth then the net downward force exerted by the Earth and net upward force exerted on the body are not equal to each other.
  • ✓
    Only $(i)$ and $(ii)$
  • B
    Only $(ii)$ and $(iii)$
  • C
    Only $(i)$ and $(iii)$
  • D
    All $(i), (ii)$ and $(iii)$
Answer
Correct option: A.
Only $(i)$ and $(ii)$
According to Newton's third law of motion, for every action, there is an equal and opposite reaction.
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MCQ 1241 Mark
Leaves or fruits fall on the ground due to.
  • A
    Magnetic force
  • ✓
    Gravitational force
  • C
    Electrostatic force
  • D
    Muscular force
Answer
Correct option: B.
Gravitational force
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MCQ 1251 Mark
Between his shoe and the ground In desert areas, a camel can walk very easily as compared to
horse because it has:
  • A
    Lesser weight
  • ✓
    Broader feet
  • C
    Smaller feet
  • D
    Heavier body
Answer
Correct option: B.
Broader feet
Broader feet exerts lesser pressure therefore in desert areas, a camel can walk very easily as
compared to horse.
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MCQ 1261 Mark
Which of the following examples describe the change of shape on applying force?
  • A
    A ball being kicked
  • B
    A fan switched on
  • C
    A man jumping from a height
  • ✓
    Repeatedly tearing of a paper
Answer
Correct option: D.
Repeatedly tearing of a paper
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MCQ 1271 Mark
Knives, needles, saws are made sharp or pointed to:
  • A
    Decrease pressure
  • B
    Can’t say
  • ✓
    Increase pressure
  • D
    None of these
Answer
Correct option: C.
Increase pressure
Knives, needles, saws are made sharp or pointed to increase pressure because decreasing area of contact increases pressure.
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MCQ 1281 Mark
Electrostatic force is exerted by charged body on
  • ✓
    Another charged body or uncharged body
  • B
    Metallic body only
  • C
    Another uncharged body only
  • D
    Another charged body only
Answer
Correct option: A.
Another charged body or uncharged body
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MCQ 1291 Mark
A When does a body float on water?
  • A
    When no force is acting on it.
  • ✓
    When the net force acting on the body is zero.
  • C
    When there is a gravitational pull.
  • D
    When there is friction between the body and the water.
Answer
Correct option: B.
When the net force acting on the body is zero.
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MCQ 1301 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.
Pressure $=$ force / area.
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MCQ 1311 Mark
force is applied from one direction on a body and at the same time, same force is applied to it from the other side. So, what will be the result:
  • A
    Body will move towards left.
  • B
    Body will move towards right.
  • ✓
    Body will not move at all.
  • D
    Body will start rolling at its place.
Answer
Correct option: C.
Body will not move at all.
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MCQ 1321 Mark
A football moves when we:
  • A
    Pushit
  • B
    Hit it
  • C
    Kick it
  • ✓
    All of these
Answer
Correct option: D.
All of these
A football moves when we push it, hit it had kick it.
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MCQ 1331 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
Liquids exert pressure on every direction based on the kinetic energy of their molecules. Now, in case of mustard oil the pressure exerted will not be much due to low kinetic energy of its molecules, while take the example of cold drinks after getting shaked on the other side, the molecules exert so much pressure its almost like it, flood out of the container.
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MCQ 1341 Mark
A sharp knife enable us to cut through things more easily as compare to the blunt knife because:
  • A
    The pressure exerted is lesser when the same force is used.
  • ✓
    The pressure exerted is greater when the same force is used.
  • C
    The sharp edge can pass through the material slowly.
  • D
    The sharp edge is not felt when cutting through the material.
Answer
Correct option: B.
The pressure exerted is greater when the same force is used.
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MCQ 1351 Mark
The force exerted on a normal human being due to atmospheric pressure is:
  • ✓
    $2 \times 104N$
  • B
    $2 \times 105N$
  • C
    $2 \times 106N$
  • D
    None of these
Answer
Correct option: A.
$2 \times 104N$

$2 \times 105 N$ force is exerted on a normal human being due to atmospheric

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MCQ 1361 Mark
The force of $150N$ is applied to an object of area $3m^2.$ Calculate the pressure.
  • A
    $25N/ m^2$
  • ✓
    $50N/ m^2$
  • C
    $100N/ m^2$
  • D
    $147N/ m^2$
Answer
Correct option: B.
$50N/ m^2$
Force $= 100N,$ Area $= 3m^2$ Putting these values in the formula for pressure:
Pressure $= 100N/ 2m^2 = 50N/ m^2$ Thus, the pressure is $50$ newtons per square meter or $50$ pascals.
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MCQ 1371 Mark
When a force of $5N$ acts on a surface, it produces a pressure of $500Pa.$ The area of surface then must be:
  • A
    $10\ cm^2$
  • B
    $50\ cm^2$
  • ✓
    $100\ cm^2$
  • D
    $0.01\ cm^2$
Answer
Correct option: C.
$100\ cm^2$
Pressure $=$ thrust/ area.
Area $=$ Pressure/ Thrust $= 500/ 5 = 100\ cm^2.$
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MCQ 1381 Mark
A brick is kept in three different ways with the help of $v, l, o$ shapes on a table. The pressure exerted by the brick on the table will be.
  • ✓
    Maximum in position $v.$
  • B
    Maximum in position $o.$
  • C
    Maximum in position $l.$
  • D
    Equal in all cases..
Answer
Correct option: A.
Maximum in position $v.$

Pressure will be maximum in position v, because area of contact is minimum in this case and area is inversely proportional to pressure.

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MCQ 1391 Mark
The magnitude of force is expressed in the unit of force called:
  • A
    Pascal.
  • B
    Kelvin.
  • ✓
    Newton.
  • D
    Magdeburg.
Answer
Correct option: C.
Newton.
The unit of force is newton.
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MCQ 1401 Mark
Gravitational force is acting on
  • A
    Only on moon
  • B
    Only on other planets
  • C
    Only on earth
  • ✓
    All bodies
Answer
Correct option: D.
All bodies
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MCQ 1411 Mark
Force acting on per unit area is called:
  • A
    Non-contact forces
  • B
    Contact forces
  • C
    Force
  • ✓
    Pressure
Answer
Correct option: D.
Pressure
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MCQ 1421 Mark
Reindeers are made to pull the sleds in artic regions. The force involved in this activity is:
  • A
    Frictional force
  • B
    Gravitational force
  • C
    Magnetic force
  • ✓
    Muscular force
Answer
Correct option: D.
Muscular force
In article regions, reindeers are made to pull the sleds that are used as passenger vehicles. In these cases, the muscles of animals apply force. This force is called muscular force.
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MCQ 1431 Mark
Which of the following is not an example of muscular force?
  • A
    A porter carrying a load on a wheel-barrow.
  • ✓
    An apple falling from a tree.
  • C
    A child riding a bicycle.
  • D
    A person drawing water from a well.
Answer
Correct option: B.
An apple falling from a tree.
An apple falling from a tree is an example of gravitational force.
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MCQ 1441 Mark
If two forces act in opposite directions on an object,the net force acting on it is the:
  • A
    Addition of two forces.
  • ✓
    Difference of two forces.
  • C
    Division of two forces.
  • D
    Multiplication of two forces.
Answer
Correct option: B.
Difference of two forces.
Forces applied on an object in the same direction add to one another.
If two forces axt in the opposite directions on an object,the net force acting on it is the difference between the two forces.
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MCQ 1451 Mark
The diagram shows a simple mercury barometer. The mercury level is at a height h when the atmospheric pressure is $100000Pa.$

What is the pressure at $P?$
  • A
    $40000Pa.$
  • ✓
    $60000Pa.$
  • C
    $100000Pa.$
  • D
    $140000Pa.$
Answer
Correct option: B.
$60000Pa.$

One common error is to think that the pressure at $0.4h$ above the surface of the reservoir of mercury is $0.4$ times the atmospheric pressure. The pressure at $P$ is caused by the weight of the mercury above point P. The pressure at $P = 0.6 \times 100000 = 60000$Pa.

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MCQ 1461 Mark
What is state of motion?
  • A
    Position of rest
  • B
    Position of motion
  • ✓
    Both by the state of rest or motion
  • D
    None of these
Answer
Correct option: C.
Both by the state of rest or motion
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MCQ 1471 Mark
What will happen if there is a vacuum just above one limb of the $U$-tube half filled with liquid as shown in figure?
  • ✓
    The liquid will rise up in the limb where a vacuum just above and move down the other.
  • B
    The liquid will move down in the limb where a vacuum just above and rise up the other.
  • C
    The liquid will move down in both the limbs of $U$-ube.
  • D
    The liquid will rise up in both the limbs of $U$-tube.
Answer
Correct option: A.
The liquid will rise up in the limb where a vacuum just above and move down the other.

When there is extra pressure applied to any one limb, the liquid in it is forced down and the level in the other limb rises.

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MCQ 1491 Mark
What is the cause of change in motion or change in the state of motion?
  • A
    Pressure.
  • B
    Atmospheric Pressure.
  • C
    Friction.
  • ✓
    Force.
Answer
Correct option: D.
Force.
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MCQ 1501 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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