Worksheet 7 Electricity CBSE Board Ten Q/A @ CBSE @NEET Exam 100 % Success

 Electricity 

Very Short Answer Type Questions👇

 1. By what other name is the unit Joule⁄Coulomb called? 

Ans: Potential Difference is said to be 1 Volt between two points if 1 Joule of work is done in moving 1 coulomb of electric charge from one point to another. 

2. Which of the following statements correctly defines a volt? 

(a) A volt is a joule per ampere. 

(b) A volt is a joule per coulomb.

 Ans: The second statement defines "volt" correctly. 

Explanation: One Volt is the electric potential energy per unit charge, and is measured in joules per coulomb. 

3. What do the letters p.d. stand for? 

Ans:  p.d. stands for potential difference. Potential difference between two points in a circuit is the work done in moving unit charge (i.e. one coulomb) from one point to the other. 

4. Which device is used to measure p.d.? 

Ans: Voltmeter is a device which is used to measure potential difference between two point in an electric circuit. 

5. What is meant by saying that the electric potential at a point is 1 volt? 

Ans: Electric Potential at a point being 1 volt means that 1 joule of work is done in moving 1 unit positive charge from infinity to that point 

6.  How much work is done when one coulomb charge moves against a potential difference of 1 volt?

 Ans: 1 Joule of work is done when 1 coulomb of charge moves against a potential difference of 1 volt. As potential difference = 

 7. What is the SI unit of potential difference? 

Ans: The SI unit of potential difference is volt, which is also known as Joule/Coulomb 

8. How much work is done in moving a charge of 2 C across two points having a potential difference of 12 V? 

Ans: 

Given, 

charge = 2 C 

Potential difference between two points = 12V 

Work done (W) =? 

We know that; V = W/Q 

Or, W = V × Q

 Or, W = 12 V × 2 C 

             = 24 J 

9. What is the unit of electric charge? 

Ans:  The SI unit of electric charge is coulomb (C).

10. What is meant by conductors and insulators? Give two examples of conductors and two of insulators.

Ans: Those substance which allow electric current to pass through them easily is called conductors. Examples. Iron, copper, zinc.

 Those substance which do not allow electric current to pass through them is called Insulators. Examples. Mica, Air, Paper.

Ashwani Kumar🙏

ashwanikmr82@gmail.com