Q.1.
If a body is moving with a constant speed along a straight line; then in order to change its direction of motion, an external force has to be applied in a direction normal to the direction of motion.
-
50%
True
-
50%
False
Q.2.
Pressure varies inversely with area (A) provided the thrust is same.
-
50%
True
-
50%
False
Q.3.
Pressure varies with force (F) as (provided area is same)
-
50%
$$P\propto F$$
-
50%
$$P\propto \dfrac {1}{F}$$
-
0%
$$P\propto F^2$$
-
0%
$$P\propto \dfrac {1}{F^2}$$
Q.4.
A force produces translational motion:
-
50%
When the body is free to move and applied force pass through the rotation axis
-
0%
When the body is hindered to move
-
0%
When the body is rigidly fixed
-
50%
When the body is free to move and applied force does not pass through the rotation axis
Q.5.
Which of the following force doesn't change with distance?
-
0%
Electrostatic force
-
0%
Gravitational force
-
100%
Frictional force
-
0%
Magnetic force
Q.6.
It is better to use a sharp tipped nail than a blunt nail because :
-
100%
The tip with the smallest area will produce a higher pressure when a force is applied.
-
0%
A sharp tipped nail needs a larger force to drive it into the wooden surface
-
0%
The sharp tip saves cost as less raw materials are required to make such nails
-
0%
The sharp tip has a spiralling effect when the nail is hit on the head
Q.7.
With the increase in the area of contact of an object, the pressure:
(Note : Thrust remains same)
(Note : Thrust remains same)
-
0%
Increases
-
100%
Decreases
-
0%
Is not affected
-
0%
None of these
Q.8.
Which of the statements about force are true?
-
0%
It can be seen
-
100%
It causes an object to move
-
0%
It is pull or a push
-
0%
It can change the motion of an object
Q.9.
The pressure exerted by a women wearing shoes with pointed heels is ...... than what an elephant with one foot can exert on ground :
-
0%
Much lesser
-
100%
Much greater
-
0%
Both equal
-
0%
None of these
Q.10.
Fill in the blank.
Dams are ____ at the base.
-
100%
thicker
-
0%
thinner
-
0%
same
-
0%
can't say
Q.11.
Which of the following has infinite range?
-
0%
Gravitational force
-
0%
Electromagnetic force
-
100%
Strong nuclear force
-
0%
Both a and b
Explanation
Q.12.
The same force acting on a smaller area exerts a larger pressure, and a smaller pressure on a larger area.
-
100%
True
-
0%
False
-
0%
Ambiguous
-
0%
Data insufficient
Q.13.
A box exerts a force of $$420N$$ on a floor. The bottom of the box has an area of $$0.7m^2$$. What is the pressure exerted by the box on the floor?
-
0%
$$600 Pa$$
-
0%
$$500 Pa$$
-
0%
$$400 Pa$$
-
0%
$$700 Pa$$
Q.14.
Ask a friend to drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt you?
-
0%
Because the nail has a sharp point and thus, exert less pressure on wood
-
0%
The force is exerted on the wood, thus it has no effect on out head
-
0%
The relatively large mass of the books and block on your head resists being moved
-
0%
Action-reaction forces cancel out each other
Q.15.
A force $$\displaystyle F_{1}$$ accelerates a particle from rest to a velocity v. Another $$\displaystyle F_{2}$$ decelerates the same particle from v to rest, then:
-
0%
$$\displaystyle F_{1}$$ is always equal to $$\displaystyle F_{2}$$
-
0%
$$\displaystyle F_{2}$$ is greater than $$\displaystyle F_{1}$$
-
0%
$$\displaystyle F_{2}$$ may be smaller than, greater than or equal to $$\displaystyle F_{1}$$
-
0%
$$\displaystyle F_{2}$$ cannot be equal to $$\displaystyle F_{1}$$
Q.16.
Porters (coolies) place a round piece of cloth on their heads, to ______ the area of contact of the load with their head.
-
0%
increase
-
0%
decrease
-
0%
maintain the same
-
0%
Cannot say
Q.17.
It is easier to cut with a sharp knife than with a blunt one, This is because
-
0%
sharp knife exerts more pressure
-
0%
sharp knife exerts less pressure
-
0%
both knives exert equal pressure
-
0%
sharp knife has a better grip
Q.18.
Buildings have wide foundations so that they exert less force on the ground or Earth.
-
0%
True
-
0%
False
Q.19.
A $$1.5m$$ wide by $$2.5m$$ long water bed weighs $$1025N$$. Find the pressure that the water bed exerts on the floor. Assume that the entire lower surface of the bed makes contact with the floor.
-
0%
$$273.3Pa$$
-
0%
$$373.5 Pa$$
-
0%
$$173.3Pa$$
-
0%
$$473.3Pa$$
Q.20.
Which of the following is NOT true?
-
0%
A sharp knife can easily cut due to its small cutting surface.
-
0%
It is easier to walk in sand than on road.
-
0%
A battle tank can move easily on soft ground because its tracks have bigger surfaces.
-
0%
The pressure exerted by a needle is much more than the foot of an elephant.
Q.21.
State whether the given statement is TRUE or FALSE.
The foundations of high-rise buildings are kept wide so that they may exert more pressure on the ground.
-
0%
True
-
0%
False
Q.22.
Force can only increase or decrease the speed of a moving object or change its direction.
-
0%
True
-
0%
False
Q.23.
State whether the given statement is TRUE or FALSE.
A liquid in a container exerts pressure in all directions- on the bottom of the container, on its walls, and even upwards.
-
0%
True
-
0%
False
Q.24.
Tick the correct statements.
-
0%
air exerts pressure because it occupies space and has weight.
-
0%
air is more dense near the earth. It goes on thinning out as we go up.
-
0%
oxygen content of the air goes on decreasing as we go up.
-
0%
air is uniformly dense right fron the earth to the sky.
-
0%
air pressure is very high near the earth and it goes on decreasing as we go up.
-
0%
$$99\%$$ of air exists up to a height of nearly $$30\;km$$.
Q.25.
A mountain climber experiences a nose bleed due to:
-
0%
Decrease in atmospheric pressure
-
0%
Increase in atmospheric pressure
-
0%
More gravitational pull
-
0%
Effect of high altitude
Q.26.
If we apply the brakes to a moving car, it comes to rest. This shows that force can make a moving object go slower.
-
0%
True
-
0%
False
-
0%
Ambiguous
-
0%
Data insufficient
Q.27.
A contact force cannot act through
-
0%
Empty space
-
0%
Touching
-
0%
Touching with a metal rod
-
0%
Touching with a wooden rod
Q.28.
(a) A force of $$200\;N$$ acts on an area of $$0.02\;m^2$$. Find the pressure in Pascal.
(b) What force will exert a pressure of $$50,000\ Pa$$ on an area of $$0.5\;m^2$$?
(c) Find out the area of a body which experiences a pressure of $$500\ Pa$$ by a force of $$100\;N$$.
(b) What force will exert a pressure of $$50,000\ Pa$$ on an area of $$0.5\;m^2$$?
(c) Find out the area of a body which experiences a pressure of $$500\ Pa$$ by a force of $$100\;N$$.
-
0%
(a)$$\;10000\;Pa$$, (b)$$\;25000\;N$$, (c)$$\;0.2\;m^2$$
-
0%
(a)$$\;1000\;Pa$$, (b)$$\;2500\;N$$, (c)$$\;2\;m^2$$
-
0%
(a)$$\;100000\;Pa$$, (b)$$\;250000\;N$$, (c)$$\;0.2\;m^2$$
-
0%
(a)$$\;100\;Pa$$, (b)$$\;250\;N$$, (c)$$\;0.2\;m^2$$
Q.29.
Which of the following class of force is different from others?
-
0%
Magnetic force
-
0%
Electrical force
-
0%
Gravitational force
-
0%
Stretching of a spring
Q.30.
$$a$$. To stretch the bow, the archer applies a force that causes a change in its ______
$$b$$. The force applied by the archer to stretch the bow is an example of ______ force.
$$c$$. The type of force responsible for a change in the state of motion of the arrow is an example of a _____ force.
$$d$$. While the arrow moves towards its target, the forces acting on it are due to ______ and that due to _______ of air.
$$b$$. The force applied by the archer to stretch the bow is an example of ______ force.
$$c$$. The type of force responsible for a change in the state of motion of the arrow is an example of a _____ force.
$$d$$. While the arrow moves towards its target, the forces acting on it are due to ______ and that due to _______ of air.
-
0%
Shape
-
0%
Muscular
-
0%
Contact
-
0%
Gravity, Friction