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Some Natural Phenomena

Rita combed her hair with a plastic comb. Then, she noticed that the comb could attract small pieces of paper. This occurs because

a) The comb acquires charges due to friction.
b) The comb acquires heat due to friction.
c) The paper acquires charges due to friction.
d) The paper acquires heat due to friction.

✔Answer

✔Solution

Correct Answer Is : The comb acquires charges due to friction.

Solution Is : During the combing of hair, friction is produced between the hair and the comb. Due to this, some charges are acquired by the comb. When it is brought close to pieces of paper, the pieces acquire opposite charges. Therefore, there is a force of attraction between the comb and the pieces.

Mamta combed her hair with two plastic combs. If she brought the combs close to one another, the combs would

a) Acquire zero charge.
b) Attract each other.
c) Repel each other.
d) Experience zero force.

✔Answer

✔Solution

Correct Answer Is : Repel each other.

Solution Is : The two combs would get charged on rubbing with dry hair. Since the charges acquired by the combs were of same nature, they would repel each other.

One end of a refill is rubbed vigorously with polythene. The same process is repeated on another refill. The rubbed ends are placed on a metallic plate. If they are brought close to one another, they will

a) Attract each other.
b) Repel each other.
c) Experience zero.
d) Retain their charges

✔Answer

✔Solution

Correct Answer Is : Experience zero.

Solution Is : On rubbing, one end of each refill will get charged. However, they will lose their charges on being placed on a metallic plate. So, when they are brought close to one another, they will not experience any force

An earthquake is

a) Phenomenon of discharge of electricity.
b) A sudden trembling of the earth.
c) The occurrence of high tides.
d) A disturbance in the earth`s rotation

✔Answer

✔Solution

Correct Answer Is : A sudden trembling of the earth.

Solution Is : An earthquake is a sudden trembling or shaking of the earth, which is caused by a disturbance deep inside the earth`s crust. It lasts for a very short time.

In the buildings, in an earthquake prone region,

a) The cupboards and shelves should be attached to the walls.
b) The cupboards and shelves should be detached from the walls
c) The wall-clocks and photo-frames should be hung down a nail.
d) There should be less fire-fighting equipments.

✔Answer

✔Solution

Correct Answer Is : The cupboards and shelves should be attached to the walls.

Solution Is : In the buildings, in an earthquake prone region, the cupboards and shelves should be attached to the walls or they may fall on us during powerful earthquakes.

During an earthquake, we should rush

a) Into a building.
b) Out in an open field.
c) Into an open vehicle.
d) Into a park full of trees

✔Answer

✔Solution

Correct Answer Is : Out in an open field.

Solution Is : During an earthquake, buildings, trees, electric poles etc., may fall upon us. So, we should rush out in an open field.

When an ebonite rod is rubbed with some piece of flannel, the type(s) of the charges developed on the rod and the flannel is/are

a) Positive charges.
b) Negative charges
c) Positive and negative charges, respectively.
d) Negative and positive charges, respectively

✔Answer

✔Solution

Correct Answer Is : Negative and positive charges, respectively

Solution Is : On rubbing an ebonite rod with flannel, the rod gains some electrons while the flannel loses some electrons. Due to excess of electrons, the rod gets negatively charged while the latter becomes positively charged.

During the separation of charges in the formation of thunderstorms, positive and negative charges are collected at

a) The lower and upper edges of clouds, respectively.
b) The middle of clouds.
c) The upper and lower edges of clouds, respectively.
d) The lower edges of the clouds.

✔Answer

✔Solution

Correct Answer Is : The upper and lower edges of clouds, respectively.

Solution Is : The air currents move upward, while the water droplets move downward during the formation of thunderstorms. The heavier water droplets gain negative charges and get collected at the lower edges. The lighter air molecules lose negative charges, thereby becoming positively charged and get accumulated at the upper edges.

A copper ball is given some negative charge. Then, it is placed on a plastic stool placed on the ground. The final charge on the ball will be

a) Positive in nature but greater in magnitude.
b) Negative in nature but smaller in magnitude.
c) Zero.
d) Equal to the initial charge in magnitude and nature.

✔Answer

✔Solution

Correct Answer Is : Equal to the initial charge in magnitude and nature.

Solution Is : A plastic stool is an insulator. Therefore, the charge on the copper ball will be retained on it even after placing on the stool as there will be no flow of charge.

A copper ball is given some negative charge. Then, it is placed on an iron stool placed on the ground. The final charge on the ball will be

a) Positive in nature.
b) Negative in nature.
c) Zero.
d) Equal to the initial value in magnitude.

✔Answer

✔Solution

Correct Answer Is : Zero.

Solution Is : On keeping the copper ball on the iron stool placed on the ground, the ball gets earthed. Therefore, all its charge will get discharged to the ground.

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Class 8 Science Study Material

Some Natural Phenomena

Rita combed her hair with a plastic comb. Then, she noticed that the comb could attract small pieces of paper. This occurs because

Correct Answer Is : The comb acquires charges due to friction.

Mamta combed her hair with two plastic combs. If she brought the combs close to one another, the combs would

Correct Answer Is : Repel each other.

Solution Is : The two combs would get charged on rubbing with dry hair. Since the charges acquired by the combs were of same nature, they would repel each other.

One end of a refill is rubbed vigorously with polythene. The same process is repeated on another refill. The rubbed ends are placed on a metallic plate. If they are brought close to one another, they will

Correct Answer Is : Experience zero.

Solution Is : On rubbing, one end of each refill will get charged. However, they will lose their charges on being placed on a metallic plate. So, when they are brought close to one another, they will not experience any force

An earthquake is

Correct Answer Is : A sudden trembling of the earth.

Solution Is : An earthquake is a sudden trembling or shaking of the earth, which is caused by a disturbance deep inside the earth`s crust. It lasts for a very short time.

In the buildings, in an earthquake prone region,

Correct Answer Is : The cupboards and shelves should be attached to the walls.

Solution Is : In the buildings, in an earthquake prone region, the cupboards and shelves should be attached to the walls or they may fall on us during powerful earthquakes.

During an earthquake, we should rush

Correct Answer Is : Out in an open field.

Solution Is : During an earthquake, buildings, trees, electric poles etc., may fall upon us. So, we should rush out in an open field.

When an ebonite rod is rubbed with some piece of flannel, the type(s) of the charges developed on the rod and the flannel is/are

Correct Answer Is : Negative and positive charges, respectively

Solution Is : On rubbing an ebonite rod with flannel, the rod gains some electrons while the flannel loses some electrons. Due to excess of electrons, the rod gets negatively charged while the latter becomes positively charged.

During the separation of charges in the formation of thunderstorms, positive and negative charges are collected at

Correct Answer Is : The upper and lower edges of clouds, respectively.

A copper ball is given some negative charge. Then, it is placed on a plastic stool placed on the ground. The final charge on the ball will be

Correct Answer Is : Equal to the initial charge in magnitude and nature.

Solution Is : A plastic stool is an insulator. Therefore, the charge on the copper ball will be retained on it even after placing on the stool as there will be no flow of charge.

A copper ball is given some negative charge. Then, it is placed on an iron stool placed on the ground. The final charge on the ball will be

Correct Answer Is : Zero.

Solution Is : On keeping the copper ball on the iron stool placed on the ground, the ball gets earthed. Therefore, all its charge will get discharged to the ground.

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