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A charged glass rod attracts a charged plastic straw. - Science

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प्रश्न

A charged glass rod attracts a charged plastic straw.

पर्याय

  • True

  • False

MCQ
चूक किंवा बरोबर

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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Force of Friction
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 15: Some Natural Phenomena - Exercises [पृष्ठ १९७]

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एनसीईआरटी Science [English] Class 8
पाठ 15 Some Natural Phenomena
Exercises | Q 3.2 | पृष्ठ १९७

संबंधित प्रश्‍न

When a glass rod is rubbed with a piece of silk cloth the rod ______.


Write true or false.

The sliding friction is more than the rolling friction.


Fill in the blank.

We use ball bearings to .................. the friction.


Give an example to illustrate the existence of the force of friction.


State two factors which directly affect the force of friction.


The eraser gets smaller and smaller as you use it more and more. Explain the reason.


Arrange the following in descending order:

  1. static friction
  2. sliding friction and
  3. rolling friction?

A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is

  1. the static friction
  2. sliding friction and
  3. rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.

Answer the following in a word or two or in a sentence.

Why does a rolling ball stop after moving some distance?


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 ........................


Fill in the blank.

Sliding friction and rolling friction are types of .................. friction.


Tick the most appropriate answer.

Friction produces


Tick the most appropriate answer.

If you pour some oil onto a floor, the friction would


Fill in the blank.

Rolling friction is ........... than sliding friction.


Fill in the blank.

Friction depends upon the ............... of an object.


State if the following statement is true or false. Correct the statement if it is false.

Friction has no relation with our walking or running.


Complete the analogy.

Knot in a thread : _____ friction : : Ball bearing : _____ friction


Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play


We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.


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