CLASS 10 / PHYSICS / ELECTRICITY( ELECTRIC CURRENT) / WORKSHEET-1

Class 10 – Physics

 Ch 12 – Electricity

(WORKSHEET - 1)

Subtopic – (12.1) Electric current and circuit

MCQ's

1.  One coulomb charge is equivalent to the charge contained in :

(a) 2.6 x 10¹⁹ electrons
(b) 6.2 x 10¹⁹ electrons
(c) 2.65 x 10¹⁸ electrons

(d) 6.25 x 10¹⁸ electrons

2.  Which of the following units could be used to measure the electric charge?

(a) Ampere
(b) Joule
(c) Volt
(d) Coulomb

3.  Which of the following units could be used to measure the electric current?

(a) Ampere
(b) Joule
(c) Volt
(d) Coulomb

4.  Device used to detect electric current in circuit-

(a) Galvanometer
(b) Ammeter
(c) Voltmeter
(d) Barometer

5.  Device used to measure electric current in circuit-

(a) Galvanometer
(b) Ammeter
(c) Voltmeter
(d) Barometer

6.  The resistance of Ammeter should be-

(a) Small
(b) Large
(c) Very large
(d) Doesn’t matter

7.  In an electric circuit Ammeter should be connected in-

(a) Series
(b) Parallel
(c) both (a) and (b)
(d) neither (a) nor (b)

8.  For current to flow through a circuit, the circuit must be__________.

(a) Closed
(b) Open
(c) Can’t say depend on circuit
(d) All above

9.  Which of the following equations shows the correct relationship between electric units?

(a) 1 A = 1 C / sec
(b) 1 C = 1 A / sec
(c) 1 A = 1 C x 1 sec
(d) 1 C = 1 A x 1 sec

10.     Which of the following relation are correct

(a) 1 m A = 10^-3 A and 1 µA = 10^-3 A
(b) 1 m A = 10^-3 A and 1 A = 10^-6 µA
(c) 1 µA = 10^-3 A and 1 m A = 10^-3 A
(d) 1 m A = 10^-3 A and 1 µA = 10^-6 A

  

NUMERICAL

1.  A radio set draws a current of 0.36 A for 15 minutes. Calculate the amount of electric charge that flows through the circuit? ( ans = 324 C )

2. If the charge of an electron is 1.6 x 10^-19 coulomb, how many electrons should pass through a conductor in 1 second to constitute 1 ampere of current?

( ans = 6.25 x 10¹⁸ electrons)  

3. If 18400 C of charge flows through an air conditioning unit every hour, what current does it draws? ( ans = 5.1 A )           

4. A current of 3 A flows into a television set. For how long would it take 1500 C of charge to flow through it? ( ans = 500 sec )           

5. How many electrons are flowing per second past a point in a circuit in which there is a current of 5 ampere? ( ans = 31.25 x 10¹⁸ )