Science - Force and Pressure
Exam Duration: 45 Mins Total Questions : 30
Which of the following actions describe pushing force?
- (a)
Kicking
- (b)
Lifting
- (c)
Picking
- (d)
Opening
Which of the following is NOT a force?
- (a)
Muscular
- (b)
Magnetic
- (c)
Chemical
- (d)
Electric
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.
- (c)
The body remains at rest.
- (d)
The body breaks up.
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
- (d)
Repeatedly tearing of a paper
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
- (d)
Acceleration in a moving body
Which of the following is a non-contact force?
- (a)
Muscular force
- (b)
Electrostatic force
- (c)
Elastic spring force
- (d)
Frictional force
What causes the atmospheric pressure?
- (a)
The sky above our head
- (b)
The air surrounding the earth
- (c)
The gravitational force of the sun and other planets
- (d)
The mass of the earth
How does the pressure exerted by a liquid change?
- (a)
Increases with depth
- (b)
Decreases with depth
- (c)
Remains constant
- (d)
First increases and then decreases
What is thrust equal to?
- (a)
orcex area
- (b)
Force/area
- (c)
Pressure
- (d)
Pressurex area
When does a body float on water?
- (a)
When no force is acting on it.
- (b)
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
Which of the following effects is NOT caused by the magnetic force between a magnet and a magnetic substance?
- (a)
Change of state
- (b)
Change of shape
- (c)
Change of size
- (d)
Change of chemical composition
In cities, water from an overhead tank is supplied to houses using the principle of
(i) difference in pressure.
(ii) gravitational force.
(iii) decrease of friction in pipes
- (a)
Only (i)
- (b)
Only (i) and (ii)
- (c)
Only (ii) and (iii)
- (d)
(i), (ii) and (iii)
A deep sea diver's ears get hurt when he is inside the water. What is the cause for it?
- (a)
Lack of oxygen
- (b)
Decrease in atmospheric pressure
- (c)
Increase in water pressure
- (d)
All of the above
What does a barometer measure?
- (a)
Liquid pressure
- (b)
Thrust
- (c)
Atmospheric pressure
- (d)
Air temperature
Four forces are acting on a body. If the body does not change its position or shape, then what does it mean?
- (a)
Forces are similar acting in the same direction.
- (b)
Forces are parallel and opposite.
- (c)
Forces add up to zero when taken as vectors.
- (d)
Forces are different acting in the same direction.
Why do deep sea divers use a special suit for diving?
- (a)
To maintain their body temperature in cold sea water
- (b)
To protect against sea animals
- (c)
To counter balance the pressure in the sea.
- (d)
To keep them dry
On what factors does the magnitude of non-contact force depend?
- (a)
Distance between two bodies
- (b)
Mass of the two bodies
- (c)
Chemical composition of the two bodies
- (d)
All of the above
Why does a rubber sucker stick to a surface?
- (a)
It is the inherent property of rubber.
- (b)
Gravitational force acts on it.
- (c)
Elastic spring force acts on it.
- (d)
Atmospheric pressure acts on it.
Which force does an archer use to pull a bow?
- (a)
Muscular force
- (b)
Magnetic force
- (c)
Gravitational force
- (d)
All of the above
Which of the following requires a pushing force?
- (a)
Throwing a stone
- (b)
Grabbing hold of a pencil
- (c)
Leaves falling from a tree
- (d)
A load lifted by a pulley
.Identify the application of low pressure in everyday life.
- (a)
Wide tyres of a heavy vehicle
- (b)
Cutting of an apple with a sharp knife
- (c)
Hammering of a nail into wood
- (d)
All of the above
Which of the following is true of the man in the picture shown below?
- (a)
He is applying force on the stool.
- (b)
He represents only magnitude but no direction.
- (c)
He is not applying any force on the stool.
- (d)
The gravitational pull of earth on the stool is greater.
Which of the following statements about the moon is NOT correct?
- (a)
The moon orbits the earth keeping the same side facing us.
- (b)
The gravitational pull of the moon causes high tides in oceans.
- (c)
The craters on the moon caused long ago still exist because the moon has no atmosphere.
- (d)
The sun lights up the complete moon at anyone time.
A book remains at rest on a table. Why?
- (a)
No force acts on it.
- (b)
There is friction between the book and the surface of the table.
- (c)
Force exerted by the book on the table is the same as the force exerted by the table on the book.
- (d)
All of the above
How is the weight of an astronaut in the outer space in relation with his actual weight?
- (a)
It is less than his actual weight.
- (b)
It is more than his actual weight.
- (c)
It is the same as his actual weight.
- (d)
It is zero.
Why is the atmospheric pressure not felt by us?
- (a)
It is small in magnitude.
- (b)
It acts only on atmosphere and not on us.
- (c)
Our internal body pressure is equal to that of the atmospheric pressure.
- (d)
It does not act at sea level.
The speed of a falling body increases continuously. Why?
- (a)
No force acts on the falling body.
- (b)
The falling body is very light.
- (c)
Air exerts a frictional force on the falling body.
- (d)
The force acting on the body is in the direction of the fall.
Look at the block placed on the table given below:
Which of the following physical quantities is not the same when this block is kept over a table with its different faces touching the table?
- (a)
Pressure
- (b)
Volume
- (c)
Weight
- (d)
Mass
Arrange the given pictures in ascending order according to the air pressure at the highest point in each case.
- (a)
(i), (ii), (iii)
- (b)
(ii), (iii), (i)
- (c)
(ii), (i), (iii)
- (d)
(iii), (ii), (i)
A spirit level is used to determine the surface level as shown in the figure below.
Why does the air bubble at the centre of the tube move to the right when the surface is inclined?
- (a)
The forces acting on the air bubble are in equilibrium.
- (b)
Unbalanced forces act on the air bubble.
- (c)
Air bubbles always rise.
- (d)
Frictional force act on the air bubble.