Force and Pressure Test

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Force and Pressure Test - 41

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Question 1
1 / -0

A wooden piece $$5\, N$$ in weight and $$5cm \times 3cm \times 2cm $$ in size lies on $$5cm \times 2cm$$ face. The pressure exerted by it in $$N\, per\, cm^2$$ is:

A
$$150$$

B
$$50$$

C
$$0.5$$

D
$$15$$

Solution

force on wooden piece
$$=N=mg$$
$$N=5N$$
$$P= \dfrac {N}{A} =\dfrac {5N}{10cm^2} =0.5N/cm^2$$
Question 2
1 / -0

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in the three vessels. The pressure at the base will be

A
Maximum in vessel $$A$$

B
Maximum in vessel $$B$$

C
Maximum in vessel $$C$$

D
Equal in all the vessels

Solution

We know that pressure is force per unit area.
Given that equal volumes of liquid are poured in the three vessels having same base area.
Since there is only one force acting on the base of the vessels i.e gravitation force which is same for all three vessels.
Therefore pressure acting on the base of all three vessels is same.
Question 3
1 / -0

Consider two shoulder bags, one with a thin strap, and the other with a wide strap. If both the bags are equally heavy, the bag with the wide strap will be more comfortable to carry because

A
the thin strap has greater inertia per unit length

B
the thin strap causes greater momentum to be exerted

C
the wide strap allows friction to be spread over a bigger area, thus reducing force between shoulder and the strap

D
the wide strap enables the weight of the bag to be spread over a bigger area, thus reducing the pressure on the shoulder.

Solution

Pressure is defined as $$P =\dfrac{\text { Force }}{\text { Area }}$$

Hence, pressure is inversely proportional to area.

Since, wider strap has more area, than the thinner strap, so less pressure will be applied on shoulder.

Hence, the bag with wider strap is more comfortable.

The correct option is D.
Question 4
1 / -0

Fill in the blanks.
At least _____________ objects must be present to experience a gravitational force.

A
1

B
2

C
3

D
4

Solution

Gravitational force is the mutual attraction between any two objects. When there are more than two objects, all the possible pairs of the objects will experience the gravitational force.
So, we need at least two objects to realize the gravitational force.
Question 5
1 / -0

To move at the same speed, a car with a flat face and another with a streamlined body will require a different amount of force from the engine. The engine of the streamline bodied car will:

A
Exert less force

B
Exert more force

C
Exert zero force

D
Exert no force

Solution

Friction opposes the relative motion between two surfaces in contact. Fluid friction can be minimized by giving suitable shapes to bodies moving in fluids. A car with a streamlined body suffers less air friction while moving and a car with a flat face will suffer higher air friction. As a result car with a streamlined body will require less force from the engine to maintain the same speed.
Question 6
1 / -0

When three forces of 50N, 30N and 15N act on a body, then the body is

A
At rest

B
Moving with a uniform velocity

C
In equilibrium

D
Moving with an acceleration

Solution

Here all the three force will not keep the particle in equilibrium$$,$$
So$$,$$ the net force will not be zero and the part particle will move with an acceleration$$.$$
Hence,
option $$(D)$$ is correct answer.
Question 7
1 / -0

Write true or false. Correct the false statements.

A
The perpendicular distance from the pivot of a rotating body to the line of known as the moment arm.

B
pressure is inversely proportional to the force applied

C
Wooden sleepers are placed under railway tracks in order to increase pres.

D
pressure is independent of the roughness of the surfaces in correct.

Solution
Question 8
1 / -0

Which of the following statements is /are true?

A
The strength of a non contact force is independet of distance between the bodies.

B
Metecors that enter earth atmosphere burn up due to non-contact

C
Magnet force is a non contact force

D
Contact forces are always observes than non-contact forcs.

Solution

Magnetic forces are non-contact forces as the two bodies do not come in contact with each other.
The strength of the non-contact force decreases when distance increases.
When a meteoroid enters the Earth's upper atmosphere, it heats up due to friction from the air.
Question 9
1 / -0

A vehicle sinks into soft ground. The vehicle is changed so that it does not sink as far. Which change is made?

A
A lower centre of mass

B
A more powerful engine

C
Wheels that are further apart

D
Wider tyres

Solution

We know that $$Pressure = \dfrac{thrust}{area}$$

The weight of vehicle with narrow tyre and the one with wide tyre is the same. That means the thrust is equal in both cases. But we can change the effect of this thrust by changing the area on which it acts. The vehicle sinks into soft ground when the pressure is more, i.e the area is less.
To decrease the pressure, wider tyres must have been used. This increases the area on which thrust acts. So that the vehicle does't sink into the soft ground.
Question 10
1 / -0

Consider the following two cases which involve the motion of an object
Case 1: An apple falling from a tree towards the ground.
Case 2: To move a loaded cart on the horizontal ground.

A
Case 1: Involves pushing of the apple by earth's gravitational force

B
Case 1: Involves pulling of apple by earth magnetic force

C
Case 2: Involves loaded cart to be moved by pulling force only

D
Case 2: Involves loaded cart to be moved by both pulling or pushing force

Solution

Force is an external agent (push or pull) which changes the state of motion or rest of an object.
Case 1: An apple falling from a tree towards the ground involves the pulling of the apple by the earth's gravitational force.
Case 2: A loaded cart on the horizontal ground can be moved by both pulling or pushing force.

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Re-Attempt Weekly Quiz Competition

Force and Pressure Test - 41

Result

Force and Pressure Test - 41

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SHARING IS CARING

Question 1

$$150$$

$$50$$

$$0.5$$

$$15$$

Solution

Question 2

Maximum in vessel $$A$$

Maximum in vessel $$B$$

Maximum in vessel $$C$$

Equal in all the vessels

Solution

Question 3

the thin strap has greater inertia per unit length

the thin strap causes greater momentum to be exerted

the wide strap allows friction to be spread over a bigger area, thus reducing force between shoulder and the strap

the wide strap enables the weight of the bag to be spread over a bigger area, thus reducing the pressure on the shoulder.

Solution

Question 4

1

2

3

4

Solution

Question 5

Exert less force

Exert more force

Exert zero force

Exert no force

Solution

Question 6

At rest

Moving with a uniform velocity

In equilibrium

Moving with an acceleration

Solution

Question 7

The perpendicular distance from the pivot of a rotating body to the line of known as the moment arm.

pressure is inversely proportional to the force applied

Wooden sleepers are placed under railway tracks in order to increase pres.

pressure is independent of the roughness of the surfaces in correct.

Solution

Question 8

The strength of a non contact force is independet of distance between the bodies.

Metecors that enter earth atmosphere burn up due to non-contact

Magnet force is a non contact force

Contact forces are always observes than non-contact forcs.

Solution

Question 9

A lower centre of mass

A more powerful engine

Wheels that are further apart

Wider tyres

Solution

Question 10

Case 1: Involves pushing of the apple by earth's gravitational force

Case 1: Involves pulling of apple by earth magnetic force

Case 2: Involves loaded cart to be moved by pulling force only

Case 2: Involves loaded cart to be moved by both pulling or pushing force

Solution

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