Force and Pressure Test

Result

Force and Pressure Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

A person used force ($$F$$), shown in the figure to move a load with a constant velocity on a given surface.
Identify the correct surface profile.

A

B

C

D

Solution

The figure shows that the force is constant during loading and unloading. In figure (d), the force needs to change at every point as the inclination of the surface changes at every point.
In figures (b) and (c), there are regions of constant slope. Thus no force is required in loading through those regions. But the force always has a magnitude.
The correct surface is option (a) where a loading force of $$mgsin\theta$$ is required, and $$mgsin\theta$$ acts in opposite direction while unloading.
Question 2
1 / -0

Which of the following statements is incorrect?

A
Pressure cooker cooks food faster than open utensil

B
At higher altitudes the food is not cooked properly in open utensil due to low atmospheric pressure

C
At high pressure temperature becomes more than $$100^\circ$$C and food cooks faster

D
All of these

E
None of these
Solution
The atmospheric pressure inside the pressure cooker is boosted by the trapped steam. This causes the boiling point of the water to increase . This elevated boiling point temperature is the reason foods cook faster in a pressure cooker.
At high altitude, pressure is less. At low pressure, the boiling point temperature of water is also less. Since the maximum temperature of liquid water (boiling point) is less in high altitude, it takes more time to cook there.
Food is cooked more quickly at higher pressure because at the higher pressure , the boiling point of water rises from 100 °C to 121 °C . Not because the actual temperature rises but because of increase in boiling point of water.
Hence option C is incorrect.
Question 3
1 / -0

Suppose a ball is kept still on a level surface of a table. At this condition, the ball is acted upon by _______.

A
Magnetic force

B
Gravitation force

C
Muscular force

D
No force at all

Solution

Gravitational force is an attractive force. It acts on bodies all the time under all conditions. So, when a ball is kept still on a level surface of a table, a gravitational force acts on the body.
Question 4
1 / -0

Why does a straw get attracted towards another straw which is rubbed with a sheet of paper?

A
Due to friction force

B
Due to electrostatic force

C
Due to magnetic force

D
Due to gravitational force

Solution

When a substance is rubbed, it acquires charge on its surface which leads to development of electrostatic force. In above example force acting is electrostatic force.
Question 5
1 / -0

To move a roller, a force of $$300 N$$ is required. You alone can produce a force of $$30 N$$. How many of your friends who are equally strong as you should join you to move the roller?

A
9

B
10

C
5

D
None of these

Solution

Force applied by you $$= 30 N =$$ force applied by any of your friends.
So, let there be $$x$$ people in total to push the roller.
When $$x$$ people, each giving a force of $$30N$$, give force in same direction, total force = $$(30 \times x)$$ newton
To move the roller, $$30x=300$$
So, $$x=\dfrac{300}{30}=10$$
$$\therefore$$ number of friends to join you $$=(10-1)=9$$ (excluding you)
Question 6
1 / -0

The air pressure inside our body is equal to the ____?

A
internal pressure

B
atmospheric pressure

C
both a and b

D
none of the above

Solution

The pressure inside our bodies is equal to the atmospheric pressure and balances the pressure from outside.

If the pressure inside us would be more, our bodies will burst. And if it would be less. then our bodies will get crushed under the atmospheric pressure.
Question 7
1 / -0

A force of $$100N$$ is applied on an area of $$4m^2$$. the pressure being applied on the area is

A
$$50Pa$$

B
$$25 Pa$$

C
$$12.5 Pa$$

D
$$400Pa$$

Solution

Given, $$froce=100N$$
and $$area=4m^2$$
$$\therefore$$$$pressure=\dfrac{force}{area}=\dfrac{100N}{4m^{2}} =25 Pa$$
Question 8
1 / -0

What happens, when the pressure inside a sealed bottle exceeds the atmospheric pressure?

A
The bottle bursts out

B
The bottle gets crushed

C
The bottle remains as it is

D
None of the above

Solution

When the pressure inside a sealed bottle exceeds the atmospheric pressure, it bursts out.
Question 9
1 / -0

Ink does not spill out of an ink dropper when the atmospheric pressure and ____ pressure are equal.

A
external

B
internal

C
air

D
vaccuum

Solution

As the pressure inside the dropper, i.e, the internal pressure and the atmospheric pressure are equals, Ink does not spill out.
Question 10
1 / -0

When the piston of a pump is pulled up, the pressure inside_____

A
decreases

B
increases

C
remains same

D
none of the above

Solution

We know that $$PV=constant$$
$$\implies P \propto \dfrac{1}{V}$$
So, when the piston of the pump is pulled up, the volume inside the pump increases which result in a decrease in pressure.