M.C.Q. [I MARKS]

MCQ 11 Mark

In the given figure, a beaker is filled with water. $A, B$ and $C$ are three holes in beaker, which of the following statements is correct regarding this?

A
The water comes out with maximum pressure from hole $A.$
B
The pressure of water comes out from hole $B$ is greater than the pressure of water comes out from hole $C$ and hole $A$.
✓
The water falls out the farthest through the hole $C.$
D
The water falls out the nearest through the hole $B.$

Answer

Correct option: C.

The water falls out the farthest through the hole $C.$

The water pressure at the base of the container is much greater than at the top. So water falls out the farthest through the hole $C.$

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MCQ 21 Mark

State of motion is described by:

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 31 Mark

$1$ kilogram weight is equal to:

A
$98N$
✓
$9.8N$
C
$0.98N$
D
$0.098N$

Answer

Correct option: B.

$9.8N$

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MCQ 41 Mark

Which of the following effects is caused by frictional force?

A
Change in the shape of an object
B
Change in the direction of the motion of an object
C
Slowing down of a moving object
✓
Acceleration in a moving body

Answer

Correct option: D.

Acceleration in a moving body

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MCQ 51 Mark

Payal is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Payel wants to take help from you:

A
Pressure is produced when a force acts on an object.
B
The force with which the earth pulls the objects towards it, is called the force of gravity.
C
The gravitational force between the sun and the earth which holds the earth in its orbit around the sun.
✓
None of the above.

Answer

Correct option: D.

None of the above.

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MCQ 61 Mark

The instrument used of measure atmospheric pressure is:

✓
Mercury barometer
B
Manometer
C
Pressure meter
D
None of these

Answer

Correct option: A.

Mercury barometer

Mercury barometer is the instrument used to measure atmospheric pressure

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MCQ 71 Mark

The unit of force is $..........$

A
Newton
B
Dyne
C
$kg.$ weight
✓
All of these

Answer

Correct option: D.

All of these

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MCQ 81 Mark

Consider the following statements and choose the incorrect one:

A
The strength of a force is expressed by its magnitude.
B
The magnitude of a force is expressed in the $si$ unit of force called “newton”.
C
An adult man can apply large force on an object whereas a child can apply only a small force on an object.
✓
None of the above.

Answer

Correct option: D.

None of the above.

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MCQ 91 Mark

Opening a door is an example of $..........$

✓
Contact force.
B
Non contact force.
C
Spring force.
D
Magnetic force.

Answer

Correct option: A.

Contact force.

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MCQ 101 Mark

A boy set up an experiment as shown in the diagram. As he slide the magnet across the wooden board, the ball bearing followed the magnet's movement and direction. What does the experiment show?

$i.$ Magnetic force can be seen due to friction between ball bearing and wooden board.
$ii.$ Friction and gravity help to move the ball bearing.
$iii.$ The ball bearing is made of a magnetic substance.
$iv.$ Magnetic force can pass through the wooden board.

A
$(i)$ and $(ii)$
✓
$(iii)$ and $(iv)$
C
$(i), (iii)$ and $(iv)$
D
$(ii), (iii)$ and $(iv)$

Answer

Correct option: B.

$(iii)$ and $(iv)$

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MCQ 111 Mark

Three identical vessels $A, B$ and $C$ contain same quantity of liquid. In each vessel, blocks with different densities but same masses are placed as shown in figure. If $F_A, F_B$ and $F_C$ are the total forces acting on the base of vessels $A, B$ and $C$ respectively, then:

✓
$F_A = F_B = F_C$
B
$F_A < F_B < F_C$
C
$F_A = F_B < F_C$
D
$F_A > F_B > F_C$

Answer

Correct option: A.

$F_A = F_B = F_C$

Force acting on the base of vessels $A, B$ and $C$ is the weight of block and weight of water, which is same for all the three vessels. Hence, $F_A = F_B = F_C.$

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MCQ 121 Mark

A force of $16N$ acts on an area of $50\ cm^2.$ What is the pressure in pascal?

A
$4200 Pa$
B
$5200 Pa$
✓
$3200 Pa$
D
$2200 Pa$

Answer

Correct option: C.

$3200 Pa$

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MCQ 131 Mark

A pressure of $10kPa$ acts on an area of $0.3m^2.$ The force acting on the area will be:

✓
$3000N.$
B
$30N.$
C
$3N.$
D
$300N.$

Answer

Correct option: A.

$3000N.$

Force $=$ pressure $\times $ area
$= 10 \times 1000 \times 0.3 = 3000N.$

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MCQ 141 Mark

A wooden block is floating in water contained in a beaker. If the beaker is placed in a free falling elevator, during the free fall, the up thrust on the block will be:

A
Equal to the weight of the block.
B
Slightly more than the weight of the block.
C
Slightly less than the weight of the block.
✓
Zero.

Answer

Correct option: D.

Zero.

The wooden block is floating in water. During free fall, weight of block floating in water will be zero, hence no water will be displaced. So up thrust on the block will also be zero.

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MCQ 151 Mark

When bicycle tube is punctured than:

A
It bursts
B
Air escapes very fast
✓
Air escapes slowly
D
None of these

Answer

Correct option: C.

Air escapes slowly

When bicycle tube is punctured than air escapes slowly.

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MCQ 161 Mark

When we walk on sand our feet sink into it and it is difficult for us to walk but a camel can easily walk on sand because:
$i.$ The weight of the camel is the force that is spread over the large area covered by its feet.
$ii.$The pressure exerted by the camel's body on the sand is very large.

✓
Only $(i)$ is correct.
B
Only $(ii)$ is correct.
C
Both $(i)$ and $(ii)$ are correct and $(ii)$ is the conclusion of $(i).$
D
Both $(i)$ and $(ii)$ are correct and $(i)$ is the conclusion of $(ii).$

Answer

Correct option: A.

Only $(i)$ is correct.

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MCQ 171 Mark

In the given diagram, when a weight of $100g$ is hung from the spring, its length is $9\ cm$. When a weight of $150g$ is hung from it, its length is $11\ cm$. What is the length of the spring when there is no weight hanging from it?

A
$2\ cm.$
B
$4\ cm.$
✓
$5\ cm.$
D
$7\ cm.$

Answer

Correct option: C.

$5\ cm.$

Increase in weight by $50g$, length of spring increases by $2\ cm$. oppositely decrease in weight by $50g$, length decreases by $2\ cm$. So original length of spring is $5\ cm.$

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MCQ 181 Mark

In Figure two boys $A$ and $B$ are shown 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 191 Mark

The instrument used to measure pressure of liquids is:

A
Barometer
✓
Manometer
C
Pressure meter
D
None of these

Answer

Correct option: B.

Manometer

The instrument used to measure pressure of liquids is manometer.

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MCQ 201 Mark

Pressure $=$

✓
Force/area
B
Force $\times$ area
C
Area/force
D
None of these

Answer

Correct option: A.

Force/area

Pressure is force/area

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MCQ 211 Mark

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 221 Mark

A body is said to be under balanced forces when the resultant force applied on that body is $............$

A
One
✓
Zero
C
Infinite
D
None of these

Answer

Correct option: B.

Zero

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MCQ 231 Mark

What is force?

A
Pull
B
Push
✓
Push and push both
D
None of these

Answer

Correct option: C.

Push and push both

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MCQ 241 Mark

Length of a rubber band $...........$ when a stretching force is applied.

✓
Increases
B
Decreases
C
Remains same
D
None

Answer

Correct option: A.

Increases

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MCQ 251 Mark

The force involved in falling an apple from a tree is:

A
Magnetic force.
B
Contact force.
C
Electrostatic force.
✓
Gravitational force.

Answer

Correct option: D.

Gravitational force.

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MCQ 261 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.

The reason for repulsion may be either an electrostatic $($in case of similar charges$)$ or a magnetic $($in case of similar poles$)$ force.

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MCQ 271 Mark

When the hammer strikes the gong of an electric bell, which of the following force is responsible for the movement of hammer?

A
Gravitational force alone
B
Magnetic force alone
✓
Electrostatic force alone
D
Frictional force alone

Answer

Correct option: C.

Electrostatic force alone

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MCQ 281 Mark

Which one of the following forces is a contact force?

A
Force of gravity.
✓
Magnetic force.
C
Force of friction.
D
Electrostatic force.

Answer

Correct option: B.

Magnetic force.

Force of friction is a contact force. It always acts when the bodies are in contact.

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MCQ 291 Mark

A charged balloon attaches to a wall because of $........$

A
Muscular force.
✓
Electrostatic force.
C
Magnetic force.
D
Gravitational force.

Answer

Correct option: B.

Electrostatic force.

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MCQ 301 Mark

The unit of force is $.........$

A
Newton
B
Dyne
C
kg. weight
✓
All of these

Answer

Correct option: D.

All of these

It is named after Isaac Newton. One newton is the force needed to accelerate one kilogram of mass at the rate of one meter per second squared in direction of the applied force.
The SI unit of force is the kilogram$-$metre per second squared which is called the newton $(1 N = 1 \ kg-m/s^2).$
$1N = 1\ kg.m.s^{−2}$
$kg =$ kilogram, $m =$ meter, and $s =$ second

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MCQ 311 Mark

Muscular force is also called $..........$ force.

A
Non$-$contact
✓
Contact
C
Gravitational
D
Magnetic

Answer

Correct option: B.

Contact

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MCQ 321 Mark

Lungs expand and contract while we inhale and exhale air during breathing.The force involved in this activity is called:

A
Breathing force
✓
Muscular force
C
Kinetic force
D
Pulmonary force

Answer

Correct option: B.

Muscular force

Force resulting due to action of muscles is known as muscular force.And in breathing internaland external intercoastal muscles are involved.

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MCQ 331 Mark

If no force acts on a body at rest, then what effect can be observed?

A
The body changes shape.
B
The body moves with increased speed.
✓
The body remains at rest.
D
The body breaks up.

Answer

Correct option: C.

The body remains at rest.

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MCQ 341 Mark

When two forces,applied on an object, equal and opposite,then the forces:

A
May move the object.
B
May stop the object.
C
May move the object and also cause a change in its shape.
✓
Do not move the object but may cause a change in its shape.

Answer

Correct option: D.

Do not move the object but may cause a change in its shape.

A force may not always succeed in bringing a change in the state of motion of an object.
When equal and opposite force is applied it do not let the body to move,but cause change in shape of the body.

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MCQ 351 Mark

Force is:

A
Only push on an object
B
Only pull on an object
✓
Either push or pull on an object
D
None of these

Answer

Correct option: C.

Either push or pull on an object

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MCQ 361 Mark

Which force enables us to perform all activities involving movement or bending of our body?

A
Frictional force
B
Magnetic force
C
Electrostatic force
✓
Muscular force

Answer

Correct option: D.

Muscular force

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MCQ 371 Mark

As we go to the higher altitude the atmospheric pressure $............$

A
Increases
✓
Decreases
C
Remains same
D
Cannot say

Answer

Correct option: B.

Decreases

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MCQ 381 Mark

If we release a magnet held in our hand, it falls to the ground. The force responsible for this is:

A
Muscular force.
B
Magnetic force.
C
Electrostatic force.
✓
Gravitational force.

Answer

Correct option: D.

Gravitational force.

The force with which the earth pulls the objects towards it, is called the force of gravity. Gravity is a natural force of attraction or pull. If we drop a stone from some height, it falls down towards the earth. A leaf falls from the tree due to gravity. Rain falls down to earth due to the force of gravity. When we open a tap, water begins to flow down towards the ground due to the force of gravity. There are so many examples of gravitational force.

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MCQ 391 Mark

Which of the following objects exerts the maximum pressure on the floor? $($All objects have the same mass$)$.

Answer

Correct option: A.

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MCQ 401 Mark

Bikash is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

A
The pull exerted by objects possessing mass is called gravitational force.
B
The force exerted by an electrically charged object is called electrostatic force.
C
The drinking straw works on the existence of atmospheric pressure.
✓
None of the above.

Answer

Correct option: D.

None of the above.

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MCQ 411 Mark

Leaves fall down on the ground due to:

A
Electrostatic force
B
Magnetic force
✓
Gravitational force
D
Muscular force

Answer

Correct option: C.

Gravitational force

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MCQ 421 Mark

Force applied on an object in same direction

A
Divide on another
✓
Add to one another
C
Multiply on another
D
Subtract to one another

Answer

Correct option: B.

Add to one another

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MCQ 431 Mark

The force exerted by our muscle is called:

A
Electrostatic force
✓
Muscular force
C
Gravitational force
D
Non$-$contact force

Answer

Correct option: B.

Muscular force

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MCQ 441 Mark

A spring balance is used for measuring:

A
Mass
✓
Weight
C
Pressure
D
Speed

Answer

Correct option: B.

Weight

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MCQ 451 Mark

A $..............$ exerted by an object on another is a force.

✓
Push or pull
B
Contact or non$-$contact force
C
Pressure
D
Magnitude

Answer

Correct option: A.

Push or pull

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MCQ 461 Mark

Force acts on an object may change.

A
Direction
B
Shape
C
Speed
✓
All of above

Answer

Correct option: D.

All of above

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MCQ 471 Mark

There are three tins filled with water and have holes of the same size as shown in figure. Which of the following options is correctly identifies true $(T)$ and false $(F)$ for the given statements?

$i.$ The farthest spout is from the middle hole in case $(a).$
$ii.$ The stream of water falls out the farthest through the upper hole in case $(b).$
$iii.$ The farthest spout is from the lowest hole in case $(c).$

A
$(i) - T, (ii) - T, (iii) - T$
B
$(i) - F, (ii) - T, (iii) - T$
✓
$(i) - F, (ii) - F, (iii) - T$
D
$(i) - F, (ii) - F, (iii) - F$

Answer

Correct option: C.

$(i) - F, (ii) - F, (iii) - T$

The pressure exerted by water in all directions is the same at the same depth. The pressure of the water increases with depth and is independent of the size or shape of the container.

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MCQ 481 Mark

Identify the type of force in diagram: