Electricity and Circuits Class 6 Worksheet Science Chapter 9

Q1. Fill in the blanks:

i.                  do not allow current to pass through them.

Ans. Insulators

ii. Air is an               .

Ans. insulator

iii. Our body is a             conductor of electricity.

Ans. good

iv. The metal cap is the                      terminal of the electric cell.

Ans. positive

Q2. True/False:

i. Impure water can also conduct electricity.

Ans. True

ii. An electric cell produces electricity from the chemicals stored inside it.

Ans. True

iii. The metal disc is the positive terminal.

Ans.  False

iv. Brass is a conductor.

Ans.  True

v. Insulators allow current to pass through them.

Ans. False

Q3. Which device is used to open or close an electric circuit?

Ans. Electric switch

Q4. Who invented the first electric bulb?

Ans. Thomas Alva Edison invented the first electric bulb.

Q5. Who invented the first electric cell?

Ans. Alessandro Volta invented the first electric cell.

Q6. Which is the +ve terminal of a cell?

Ans. The metal cap is the positive terminal of the electric cell.

Q7. Which is the –ve terminal of a cell?

Ans. The metal disc is the negative terminal of the electric cell.

Q8. Who invented dry cell?

Ans. French chemist Georges Leclanche invented dry cell.

Q9. Define an electric switch.

Ans. A switch is a simple device that either breaks the circuit or completes it.

Q10. Where does the torch get electricity from?

Ans. Electricity to the bulb in a torch is provided by the electric cell.

Q11. Where does electricity come from?

Ans. A power station provides us with electricity.

Q12. How does an electric cell produce electricity?

Ans. An electric cell converts chemical energy into electricity.

Q13. Name the type of circuit in which switch is in ‘OFF’ position.

Ans. Open circuit

Q14. Can distilled water conduct electricity?

Ans. No, distilled or pure water does not conduct electricity.

Q15. Name the type of circuit in which switch is in ‘ON’ position.

Ans. Closed circuit or complete circuit

Q16. Can tap water or rain water conduct electricity?

Ans. Yes, tap water or rain water can conduct electricity.

Q17. What is a thin wire fixed in the middle of the glass bulb called?

Ans. A thin wire fixed in the middle of the glass bulb is called a filament.

Q18. What is a filament in a light bulb?

Ans. The thin wire that gives off light is called the filament of the bulb.

Q19. Write two examples of conductor and insulators.

Ans. Conductor – Copper and Aluminium

          Insulators – Plastic and Rubber

Q20. What is heating effect of current?

Ans. Heating caused due to conversion of electrical energy into heat energy is called heating effect of current.

Assertion and Reason Questions

Q21. Assertion (A): Insulators do not allow the current to flow through themselves.
Reason (R): They have no free charge carriers.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans. (a)

Q22. Assertion (A): In a closed electric circuit the current passes from one terminal of the electric cell to the other terminal.
Reason (R): Generally, the metal disc of a cell acts as positive terminal.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans. (c)

Q23. Assertion (A): A domestic electric appliance working on a three pin, will continue working even if the top pin is removed.
Reason (R): The third pin is used only for safety purpose.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans. (a)

Q24. Assertion (A): Silver is not used to make electric wires.
Reason (R): Silver is a bad conductor.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans. (c)

Q25. Assertion (A): Air is an insulator.
Reason (R): Those materials that do not allow electric current to pass through them are called insulators.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans. (a)

Q26. Assertion (A): Copper is used to make electric wires.
Reason (R): Copper is a poor conductor of electricity.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans. (c)