Some Natural Phenomena Test

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Some Natural Phenomena Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following causes electric sparks?

A
Wind blowing and shaking electric poles.

B
When amber rubbed with fur.

C
When we take off woollen and polyester clothes.

D
All of the above.

Solution

Electric sparks, small or large, are caused when electric poles are shaken by the wind, amber is rubbed with fur and woollen or polyester clothes are taken off.
Question 2
1 / -0

How can we be safe when there is occurrence of lightning?

A
Taking shelter inside building or house

B
When travelling through car or bus, making sure windows and doors are shut

C
If in forest, taking shelter under short trees

D
All of the above
Solution
During lightning, we can be safe:
by taking shelter under buildings.
by ensuring that windows and doors of a car are shut while travelling in a car / bus.
by taking shelter under short trees while in forest.
Question 3
1 / -0

When two positively charged materials will be placed close together:

A
they will repel each other.

B
they will become negative.

C
they will attract each other.

D
no interaction / change will be observed.

Solution

Same charges repel while opposites charges attract each other when placed together.
Question 4
1 / -0

Lightning is:

A
caused by accumulation of charges in cloud

B
caused by dispersion of charges in cloud

C
caused by rotation of charges in cloud

D
none of the above

Solution

Lightning is caused by the accumulation of charges in cloud. The positive charges form at the top of the cloud and the negative charges form at the bottom of the cloud. Since, opposite attracts, that causes positive charge to build up on the ground beneath the cloud. The electrical charge at the ground concentrates around anything , resulting in an electrical discharge from the cloud to the ground or lightning.
Question 5
1 / -0

What are may happen if a building does not have earthing?

A
Lightning may strike a building due to the opposite charge causing fire or damage to the building

B
In the rainy season, water increases the chances of lightning striking a building causing damage

C
Both A & B

D
None of the above

Solution

Sometimes electric discharge can take place between the charged cloud and earth. While passing over a tree or a tall building an opposite charge may be induced causing lightning to a building and if the charge is large it may cause severe damage and may prove to be fatal. In the rainy season water being a good conductor of electricity increases the chances of lightning striking a building.
Question 6
1 / -0

Inflate two balloons. Hang them in such a way that they do not touch each other. Rub both balloons with woollen cloth and release them. Then:

A
both balloons attract each other.

B
both balloons repel each other.

C
both balloons remain at same position.

D
none of the above happens.

Solution

The balloons will be seen to repel each other as both are charged with same polarity.
Question 7
1 / -0

What happens when charged glass rod is brought near a charged plastic straw after being rubbed with silk?

A
Repulsion is observed.

B
Attraction is observed.

C
No reaction is observed.

D
None of the above is observed.

Solution

When rubbed with silk, glass acquire positive charge. So, the glass rod become positive. The plastic straw, after being rubbed by silk, get negative charged . So both glass and plastic being opposite charges will atrract each other.
Question 8
1 / -0

When charges move, they constitute:

A
energy

B
light

C
power

D
electric current

Solution

Moving charges constitute electric current.
Question 9
1 / -0

The electrical charges generated by rubbing are:

A
dynamic

B
static

C
neutral

D
none of the above

Solution

Static charges are generated by rubbing or friction.
Question 10
1 / -0

What happens when a used plastic refill is rubbed with polythene?

A
Only refill gets charged.

B
Refill and polythene gets charged.

C
Only polythene gets charged.

D
Both gets discharged.

Solution

Both of them, refill as well as polythene, gets charged by friction.Due to friction between them on rubbing little heat produced leads to loss of electrons from one material to another hence both gets charged.

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Re-Attempt Weekly Quiz Competition

Some Natural Phenomena Test - 21

Result

Some Natural Phenomena Test - 21

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SHARING IS CARING

Question 1

Wind blowing and shaking electric poles.

When amber rubbed with fur.

When we take off woollen and polyester clothes.

All of the above.

Solution

Question 2

Taking shelter inside building or house

When travelling through car or bus, making sure windows and doors are shut

If in forest, taking shelter under short trees

All of the above

Solution

Question 3

they will repel each other.

they will become negative.

they will attract each other.

no interaction / change will be observed.

Solution

Question 4

caused by accumulation of charges in cloud

caused by dispersion of charges in cloud

caused by rotation of charges in cloud

none of the above

Solution

Question 5

Lightning may strike a building due to the opposite charge causing fire or damage to the building

In the rainy season, water increases the chances of lightning striking a building causing damage

Both A & B

None of the above

Solution

Question 6

both balloons attract each other.

both balloons repel each other.

both balloons remain at same position.

none of the above happens.

Solution

Question 7

Repulsion is observed.

Attraction is observed.

No reaction is observed.

None of the above is observed.

Solution

Question 8

energy

light

power

electric current

Solution

Question 9

dynamic

static

neutral

none of the above

Solution

Question 10

Only refill gets charged.

Refill and polythene gets charged.

Only polythene gets charged.

Both gets discharged.

Solution

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