Some Natural Phenomena Test

Result

Some Natural Phenomena Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

What is the frictional order of the following materials on rubbing:
ebonite, glass rod, wool, plastic

A
Wool, glass rod, ebonite, plastic

B
Glass rod, wool, plastic, ebonite

C
Wool, glass rod, plastic, ebonite

D
Glass rod, wool, ebonite, plastic

Solution

When any of these materials are rubbed together, the one in higher order gets positive charge (+) and the one in the lower order gets negative charge (-). The correct frictional order is: glass, wool, ebonite and plastic.
Question 2
1 / -0

What happens when the end of the paper clip of electroscope is touched by hands?

A
Electric current is produced

B
Foil strips remain as it is

C
Foil strips collapse

D
None of the above

Solution

When the paper clip of electroscope is touched by hands, the foil strips collapse because the charges on foil strips gets discharged through our body.
Question 3
1 / -0

When a charged body is brought near an electroscope:

A
the strips of foils opens up.

B
the strips of foils close.

C
the strips open and close simultaneously.

D
the strips neither open nor close.

Solution

When a charged body is brought near the top conducting disc of an electroscope, the disc gets induced with charges. These charges run down to the metal strips hanging from the paper clip. Now as both the strips get similar charge, those repel each other and thus open up.
Question 4
1 / -0

What kind of electric charge is acquired on a glass rod when it is rubbed with silk cloth?

A
Positive charge

B
Negative charge

C
Partially positive charge

D
Partially negative charge

Solution

By convention, glass acquires a higher charge than silk as it losses electron. So, on rubbing, glass acquires a positive charge and silk acquires a negative charge.
Question 5
1 / -0

When a plastic rod is rubbed with the fur, what charge does the plastic rod get?

A
Positive

B
Negative

C
Neutral

D
None of the above

Solution

Plastic comes below fur in the frictional series of electric charges. So, fur will get positive charge and plastic rod will get the negative charge.
Question 6
1 / -0

When two bodies are charged by rubbing they acquire:

A
equal and opposite charge

B
equal and same charge

C
negative charge

D
positive charge

Solution

When two bodies are rubbed on one another, they acquire charges equal in amount and opposite in nature.
Question 7
1 / -0

An electroscope is used:

A
to detect presence of charge on a body.

B
to determine the nature of charge on a body.

C
to measure the exact amount of charge on a body.

D
for both A and B.

Solution

Electroscope is a device which is use to detect whether a body is carrying charge and also to detect the nature of charge on the body.
Question 8
1 / -0

Why does not a steel spoon get charged on rubbing with polythene or woollen cloth?

A
Because steel is a poor conductor.

B
Because steel is a good conductor.

C
Because steel has high density.

D
Because a steel spoon is shiny.

Solution

Steel is a good conductor. As soon as the steel spoon gets charged by rubbing with another object, the electric charge produced on its surface flow through our hand and body into the earth and the spoon remains uncharged.
Question 9
1 / -0

The device, which can be used to detect whether an object is charged, is:

A
telescope

B
microscope

C
electroscope

D
none of the above

Solution

Electroscope is a device that is used for detection and identification of charge on objects.
Question 10
1 / -0

When plastic comb is used to comb dry hair, which type of charge does the comb acquire?

A
Negative

B
Positive

C
Neutral

D
None of the above

Solution

When we comb our hair, negative charged particles (electrons) leave our hair and travel to the plastic comb. The comb, covered in negatively charged particles, becomes negatively charged as well, and our hair is left with a positive charge.

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Re-Attempt Weekly Quiz Competition

Some Natural Phenomena Test - 13

Result

Some Natural Phenomena Test - 13

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SHARING IS CARING

Question 1

Wool, glass rod, ebonite, plastic

Glass rod, wool, plastic, ebonite

Wool, glass rod, plastic, ebonite

Glass rod, wool, ebonite, plastic

Solution

Question 2

Electric current is produced

Foil strips remain as it is

Foil strips collapse

None of the above

Solution

Question 3

the strips of foils opens up.

the strips of foils close.

the strips open and close simultaneously.

the strips neither open nor close.

Solution

Question 4

Positive charge

Negative charge

Partially positive charge

Partially negative charge

Solution

Question 5

Positive

Negative

Neutral

None of the above

Solution

Question 6

equal and opposite charge

equal and same charge

negative charge

positive charge

Solution

Question 7

to detect presence of charge on a body.

to determine the nature of charge on a body.

to measure the exact amount of charge on a body.

for both A and B.

Solution

Question 8

Because steel is a poor conductor.

Because steel is a good conductor.

Because steel has high density.

Because a steel spoon is shiny.

Solution

Question 9

telescope

microscope

electroscope

none of the above

Solution

Question 10

Negative

Positive

Neutral

None of the above

Solution

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