Electric insulators and conductors Quiz 1

Question 1

Due to electric spark, a metallic ball which behaves as a conductor developed a charge of $$1.45	imes {{10}^{-18}}C$$ in it. Choose the correct statements from the following.

Accepted Answer

The metallic ball has nine electrons in excess in it.

Answer

The metallic ball has seven electrons in excess in it.

Answer

The metallic ball is short of nine electrons from it.

Answer

The metallic ball is short of ten electrons from it.

Question 2

In her dream, Shweta saw a large cylindrical container made up of Copper having resistivity $$1.4	imes {{10}^{-3}}\Omega m^{-1}$$. The area of the container is mentioned as $$60\pi \,{{m}^{2}}$$ and the length of the cylinder is $$10m$$ . Later, her dream broke and she woke up. She was so curious that she found out the conductance of this container. What is the value of conductance that Shweta calculated?

Accepted Answer

$$13456\,oh{{m}^{-1}}$$

Answer

$$14656\,oh{{m}^{-1}}$$

Answer

$$16666\,oh{{m}^{-1}}$$

Answer

$$37466\,oh{{m}^{-1}}$$

Question 3

Rahul is passing electricity through three containers. The constituents of all the containers are listed below. $$ \ $$ Container A: It contains solid $$NaCl$$ salt. $$ \ $$ Container B: It contains Distilled water. $$ \ $$ Container C: It contains salt mixed in tap water. $$ \ $$ In which container, will he be able to successfully pass the electricity.

Accepted Answer

Container C

Answer

Container A

Answer

Container B

Answer

Container B and C

Question 4

The dimension of three metallic slabs made up of zinc are mentioned below. $$ \ $$ <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/092c03aa-f0b8-411f-b5fb-b44c6cee97558077191544394232160.png"/> $$ \ $$ The power of conducting electricity $$($$Strength of the conductor$$)$$ will follow the trend as,

Accepted Answer

$$X = Y = Z$$

Answer

$$X > Z > Y$$

Answer

$$Z > Y > X$$

Answer

$$Y > X > Z$$

Question 5

Suman was holding a spherical conductor of radius $$r$$ and whose potential is measured to be an approximate value of $$120V$$ . Tanuja snatched the conductor from Suman and placed it inside another spherical conductor which is hollow and its diameter is $$12m$$ .  She placed the conductor inside the shell such that the conductor just touches the shell. If the potential of the hollow shell is $$40V$$ , then what is the value of radius $$r$$ of the conductor?

Accepted Answer

$$2m$$

Answer

$$1m$$

Answer

$$3m$$

Answer

$$4m$$