Learn Science Force And Pressure, Class 8 Science Force And Pressure Exercise, Free Online Force And Pressure Lessons

Class 8 Science Study Material

An Educational platform for Preparation and Practice Class 8. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 8. This study material help Class 8, Science students in learning every aspect of Force And Pressure. Students can understand Force And Pressure concept easily and consolidate their learning by doing Online Practice Tests on Science,Force And Pressure chapter repeatedly till they excel in Class 8, Force And Pressure. Free ONLINE PRACTICE TESTS on Class 8, Force And Pressure comprise of Hundreds of Questions on Force And Pressure, prepared by the highly professionals team. Every repeat test of Force And Pressure will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Force And Pressure. Attempt ONLINE TEST on Class 8,Science,Force And Pressure in Academics section after completing this Force And Pressure Question Answer Exercise.

Unique pattern

Topic wise:Force And Pressure preparation in the form of QUESTION & ANSWER.
Evaluate preparation by doing ONLINE TEST of Class 8, Science,Force And Pressure.
Review performance in PRACTICE TEST and do further learning on weak areas.
Attempt repeat ONLINE TESTS of Science Force And Pressure till you excel.
Evaluate your progress by doing ONLINE MOCK TEST of Class 8, Science, All TOPICS.

Force And Pressure

A car slips on a wet road because

a) Water increases the friction between the road and the tyres.
b) Brakes can be applied on a wet road.
c) The friction between the brakes shoes and the wheels is reduced.
d) Water reduces the friction between the road and the tyres.

✔Answer

✔Solution

Correct Answer Is : Water reduces the friction between the road and the tyres.

Solution Is : Water lubricates the area in contact between the tyres and the road. This reduces the friction and the car slips on a wet road.

Force exerted during the digestion of food in alimentary canal is

a) Muscular force.
b) Electrostatic force.
c) Magnetic force.
d) Gravitational force.

✔Answer

✔Solution

Correct Answer Is : Muscular force.

Solution Is : When the food passes through the alimentary canal, the muscles surrounding it contracts and relax. Here, the action of muscles helps in the digestion of food. So, the food getting pushed in the alimentary canal is an example of muscular force.

The force exerted on the block of wood to push it on the floor is the/an

a) Muscular force.
b) Magnetic force.
c) Gravitational force.
d) Electrostatic force.

✔Answer

✔Solution

Correct Answer Is : Muscular force.

Solution Is : The force exerted on an object due to the action of muscles of the body is called muscular force. Here, the muscles are used to push the block of wood on the floor.

Pressure is directly proportional to

a) Force.
b) Volume.
c) Thickness.
d) Area.

✔Answer

✔Solution

Correct Answer Is : Force.

Solution Is : Pressure is the force per unit area applied in a direction perpendicular to the surface of an object. Hence, pressure is directly proportional to force.

Two bodies in the universe attract each other by a force called

a) Contact force.
b) Gravitational force.
c) Muscular force.
d) Frictional force.

✔Answer

✔Solution

Correct Answer Is : Gravitational force.

Solution Is : Any two bodies in the universe attract each other by a force called gravitational force. The magnitude of this force depends on the masses of two bodies and the distance between them.

The weight of a body is due to

a) Magnetic force.
b) Electrostatic force.
c) Gravitational force.
d) Frictional force.

✔Answer

✔Solution

Correct Answer Is : Gravitational force.

Solution Is : A body has weight due to gravitational force which acts on it. Gravitational force acts in the downward direction and thus, an object is pulled towards the earth by its gravity in the downward direction only. Weight of a body is given by `mg`, where, m = mass of the body and g = acceleration due to gravity.

The boiling point of a liquid increases due to

a) Increase in pressure.
b) Decrease in pressure.
c) Increase in volume.
d) Decrease in volume.

✔Answer

✔Solution

Correct Answer Is : Increase in pressure.

Solution Is : An increase in pressure means increase in force, which increases the motion of the liquid molecules in the fixed area of the container. Molecules now collide more frequently and thereby, the temperature of the liquid increases. So, there is an increase in the boiling point of the liquid.

Any change in the pressure on a confined gas will not change its

a) Volume.
b) Weight.
c) Temperature.
d) Area.

✔Answer

✔Solution

Correct Answer Is : Weight.

Solution Is : Pressure = force/ area = (force x length/ volume). An increase in pressure means increase in force, which increases the motion of the gas particles in the fixed area of the container. Particles now collide more frequently and thereby, the temperature of the gas increases. Thus, a change in pressure on an confined gas results in the change in its volume, area and temperature. Whereas, weight is given by `mg` which does not change with change in pressure as the mass of the gas and acceleration due to gravity remains constant.

A camel is able to walk on sand because

a) It has flat broad feet.
b) It has round broad feet.
c) It has flat narrow feet.
d) It has round narrow feet.

✔Answer

✔Solution

Correct Answer Is : It has flat broad feet.

Solution Is : Camel has flat broad feet which increases the area of contact with the sand. Thus, less pressure is exerted by the camel on the sand as pressure = force/area and the feet of the camel sinks very little in the sand.

Mercury column calculated for one atmospheric pressure at sea level is

a) 520 mm
b) 25 mm
c) 740 mm
d) 760 mm

✔Answer

✔Solution

Correct Answer Is : 760 mm

Solution Is : Atmospheric pressure is always calculated at sea level using a mercury barometer. Pressure(P) = hdg, where, d = 13.6 gram per cubic centimetre; and g = 9.8 metre per second squared. Therefore, for 1 atmospheric pressure, the height of the mercury column is calculated to be 76cm or 760mm.

Coloring With Vigor

Stories & Rhymes

Exploration

English

Maths

Puzzles

Class 8 Science Study Material

Force And Pressure

A car slips on a wet road because

Correct Answer Is : Water reduces the friction between the road and the tyres.

Solution Is : Water lubricates the area in contact between the tyres and the road. This reduces the friction and the car slips on a wet road.

Force exerted during the digestion of food in alimentary canal is

Correct Answer Is : Muscular force.

Solution Is : When the food passes through the alimentary canal, the muscles surrounding it contracts and relax. Here, the action of muscles helps in the digestion of food. So, the food getting pushed in the alimentary canal is an example of muscular force.

The force exerted on the block of wood to push it on the floor is the/an

Correct Answer Is : Muscular force.

Solution Is : The force exerted on an object due to the action of muscles of the body is called muscular force. Here, the muscles are used to push the block of wood on the floor.

Pressure is directly proportional to

Correct Answer Is : Force.

Solution Is : Pressure is the force per unit area applied in a direction perpendicular to the surface of an object. Hence, pressure is directly proportional to force.

Two bodies in the universe attract each other by a force called

Correct Answer Is : Gravitational force.

Solution Is : Any two bodies in the universe attract each other by a force called gravitational force. The magnitude of this force depends on the masses of two bodies and the distance between them.

The weight of a body is due to

Correct Answer Is : Gravitational force.

The boiling point of a liquid increases due to

Correct Answer Is : Increase in pressure.

Any change in the pressure on a confined gas will not change its

Correct Answer Is : Weight.

A camel is able to walk on sand because

Correct Answer Is : It has flat broad feet.

Solution Is : Camel has flat broad feet which increases the area of contact with the sand. Thus, less pressure is exerted by the camel on the sand as pressure = force/area and the feet of the camel sinks very little in the sand.

Mercury column calculated for one atmospheric pressure at sea level is

Correct Answer Is : 760 mm

Other Topics

Kids Learning

Academics

Competitive Exams

Govt. Jobs Exams