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प्रश्न
A charged glass rod attracts a charged plastic straw.
विकल्प
True
False
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उत्तर
This statement is True.
Explanation:
A charged glass rod has positive charges on its surface, while a charged plastic straw has negative charges on its surface. Since unlike charges attract each other, a charged glass rod attracts a charged plastic straw.
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संबंधित प्रश्न
Name the two kinds of forces in nature.
Name the three kinds of friction.
List three ways of reducing friction.
Give three examples to illustrate that friction is a necessary evil.
Define static friction
Define rolling friction
Answer the following.
What do you understand by a force?
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Answer the following in short.
Define force. Write its SI unit.
Answer the following in detail.
What are the various effects of force? State one example of each.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Tick the most appropriate answer.
Force of friction comes into play when a/an
Tick the most appropriate answer.
Friction is offered by
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Match the following.
| Column I | Column II | |
| a) | Static friction | Viscosity |
| b) | Kinetic friction | Least friction |
| c) | Rolling friction | Objects are in motion |
| d) | Friction between the liquid layers | Objects are sliding |
| e) | Sliding friction | Objects are at rest |
Why is a ball bearing used in a cycle hub?
Friction depends on the ______ of two surfaces in contact.
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
