Unit Test: Electricity | Science Class 10 PDF Download

Time: 1 hour

M.M. 30

Attempt all questions.

• Question numbers 1 to 5 carry 1 mark each.
• Question numbers 6 to 8 carry 2 marks each.
• Question numbers 9 to 11 carry 3 marks each.
• Question number 12 & 13 carry 5 marks each.

Q1: When electric current is passed, electrons move from: (1 Mark)
(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

Q2: The instrument used for measuring electric current is: (1 Mark)
(a) Ammeter
(b) Galvanometer
(c) Voltmeter
(d) Potentiometer

Q3: The unit of potential difference is __________________. (1 Mark)

Q4: What is the maximum resistance which can be made using five resistors each of 1/5 Ω? (1 mark)
(a) 5 Ω
(b) 10 Ω
(c) 1/5 Ω
(d) 1 Ω

Q5: A piece of wire of resistance R is cut into five equal parts. These parts are then arranged in parallel. If the equivalent resistance of this combination is R′, then the ratio R/R′ is _____. (1 Mark)
(a)  5
(b) 1/5
(c)1/25
(d) 25

Q6: What does an electric circuit mean? (2 Marks)

Q7: Write the relation between the resistance (R) of the filament of a bulb, its power (P) and a constant voltage V applied across it. (2 Marks)

Q8: How does the use of a fuse wire protect electrical appliances? (2 Marks)

Q9:  List the three factors on which the resistance of a conductor depends. (3 Marks)

Q10: What is the commercial unit of electrical energy? Represent it in terms of joules. (3 marks)

Q11: If an electric heater rated 800 W operates 6h/day. Find the Cost of energy to operate it for 30 days at ₹3.00 per unit of consumption. (3 Marks)

Q12: What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life. (5 Marks)

Q13: A hot plate of an electric oven connected to a 220 V supply line has two resistance coils such as A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What will be the currents in the three cases? (5 Marks)