# CBSE 10th Science Board Exam 2020: Practice Important MCQs from Chapter 12 – Electricity

MCQ Questions for Class 10 Science Electricity with Answers: Students CBSE Board Exams 2020 Time Table is out now. The board is going to conduct a Class 10 CBSE Science Exam on 4th March 2020. As per their official notification, this time CBSE Exam Pattern 2020 is having slight changes. The board decided to add MCQ Questions for Class 10 CBSE Board Exams. Here, you will find important MCQs from CBSE Class 10 Science Chapter 12 Electricity along with the answers.

## CBSE Class 10 Science MCQs of Electricity with Answers

Such Multiple Choice Type Questions are ideal to brushes your basic concepts to answer in CBSE Class 10 Science Exam 2020. Also, this objective type questions will help you to adjust with all various approaches. In this article, we have provided Electricity MCQ Questions for Class 10 CBSE Science Exam 2020 with a detailed explanation of answers. It makes easy to grasp the in-depth concept and logic of the question. So, practice below provided MCQ’s of CBSE Class 10 Chapter 12 Electricity topics to score maximum marks in your pre-board and final board exams.

Question 1. Electric potential is a:
(a) scalar quantity
(b) vector quantity
(c) neither scalar nor vector
(d) sometimes scalar and sometimes vector

Question 2. 1 mV is equal to:
(a) 10 volt
(b) 1000 volt
(c) 10-3 volt
(d) 10-6 volt

Question 3. Coulomb is the SI unit of:
(a) charge
(b) current
(c) potential difference
(d) resistance

Question 4. When electric current is passed, electrons move from:
(a) high potential to low potential.
(b) low potential to high potential.
(c) in the direction of the current.
(d) against the direction of the current.

Question 5. The heating element of an electric iron is made up of:
(a) copper
(b) nichrome
(c) aluminium
(d) iron

Question 6. The electrical resistance of insulators is
(a) high
(b) low
(c) zero
(d) infinitely high

Question 7. Electrical resistivity of any given metallic wire depends upon
(a) its thickness
(b) its shape
(c) nature of the material
(d) its length

Question 8. Which of the following is not correctly matched?

Question 9. Electric power is inversely proportional to
(a) resistance
(b) voltage
(c) current
(d) temperature

Question 10. What is the commercial unit of electrical energy?
(a) Joules
(b) Kilojoules
(c) Kilowatt-hour
(d) Watt-hour

Question 11. Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be
(a) greater than 3 Ω
(b) less than 1 Ω
(c) equal to 2 Ω
(d) between 1 Ω and 3 Ω

Explaination:

Question 12. An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
(a) 440 W
(b) 110 W
(c) 55 W
(d) 0.0023 W

Explaination:
Here, V = 220 V, I = 0.50 A
∴ Power (P) = VI = 220 x 0.50 = 110 W

Question 13. The resistivity of insulators is of the order of
(a) 10-8-m
(b) 101-m
(c) 10-6-m
(d) 106-m

Question 14. 1 kWh = ……….. J
(a) 3.6 × 10-6 J
(b) $\frac{1}{3.6}$ × 106 J
(c) 3.6 × 106 J
(d) $\frac{1}{3.6}$ × 10-6 J

Question 15. Which of the following gases are filled in electric bulbs?
(a) Helium and Neon
(b) Neon and Argon
(c) Argon and Hydrogen
(d) Argon and Nitrogen

Question 16. 100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:
(a) 30 V
(b) 10 V
(c) 20 V
(d) 25 V

Fill in the Blanks

1. The SI unit of current is ……… .
2. According to ……… Law, the potential difference across the ends of a resistor is directly proportional to the ……… through it, provided its remains constant.
3. The resistance of a conductor depends directly on its ……… , inversely on its ……… and also on the ……… of the conductor.
4. The SI unit of resistivity is ……… .
5. If the potential difference across the ends of a conductor is doubled, the current flowing through it, gets ……… .