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Class 12 Physics Mcqs

Q:

Two equally charged spheres attract each other. Now if they touch each other then they will _____

A) Attract each other with the same amount of force B) Repel each other
C) Attract each other with less amount of force D) Don’t attract or repel
 
Answer & Explanation Answer: D) Don’t attract or repel

Explanation: The two spheres are oppositely charged by the same amount. So if they come in contact, both of their charges are neutralized. So they become uncharged and don’t attract or repel each other.

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45
Q:

Gold-leaf electroscope can be used _______

A) Only to detect the presence of charge B) To detect the presence of charge as well as its nature (positive or negative)
C) To measure the surface charge density D) To measure current
 
Answer & Explanation Answer: B) To detect the presence of charge as well as its nature (positive or negative)

Explanation: If the apparatus is initially in contact with some positively charged body and then comes in contact with another charged body and if the divergence increases we can deduce that the second body is also positively charged. If the divergence decreases then the second body must be negatively charged.

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83
Q:

Dr. Gilbert tried to hold a brass rod by hand and induce static electricity in it by friction. Why did he fail?

A) Static electricity is induced only on insulators while brass is conducting B) The induced static charge flew through his hand and body to the ground
C) The static charge was not produced at all D) It is not possible to induce static electricity by friction
 
Answer & Explanation Answer: B) The induced static charge flew through his hand and body to the ground

Explanation: The human body is a good conductor and hence the charge produced by friction flew through his body to the ground. We can tackle the problem simply by holding the brass rod with the help of some insulated holder.

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71
Q:

What happens to the plates of the apparatus if we measure alternating charge using a Gold-leaf oscilloscope?

A) It doesn’t diverge at all B) It diverges momentarily
C) The plates give a proper divergence D) The degree of divergence increases and decreases repeatedly
 
Answer & Explanation Answer: C) The plates give a proper divergence

Explanation: The divergence of the plates of the Gold-leaf oscilloscope depends only on the presence of a charge, not on the quality of charge i.e. positive or negative. So, if the charge changes from positive to negative and vice versa the degree of divergence of the plates remains the same.

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40
Q:

Why is gold used in the Gold-leaf electroscope?

A) Gold is easily available in nature B) Gold is malleable
C) Gold is conducting in nature D) Gold is cheap
 
Answer & Explanation Answer: B) Gold is malleable

Explanation: Though gold is a costly metal it is used in electroscope because of the property malleability. This means very thin and light sheets can be formed from gold simply by hammering or rolling and hence the deflection of the light gold plates increases.

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Category: School MCQs
Sub Category: Class 12 Physics Mcqs

68
Q:

The attraction is the real proof of an object being charged.

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: If an object is attracted by another charged body, the first object may be oppositely charged or not charged because we know both an uncharged object and an oppositely charged object are attracted by another charged object.

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