Punjab 10th Class Physics Chapter 5 Current Electricity Mcqs Test Online

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Question 1 of 20

Physics

1. If we double both the current and the voltage in a circuit while keeping its resistance constant, the power:

1.Quarter

2.Remains unchanged

3.Halves

4.Doubles

Question 1 of 20

Question 2 of 20

2. In electrolytes, the flow of current is due to:

1.Only positive charge

2.Only negative charge

3.None of these

4.Both positive and negative charge

Question 2 of 20

Question 3 of 20

3. The first battery made in 1800 consisted of:

1.Copper plates only

2.Copper and zinc plates soaked in saltwater

3.Zinc plates only

4.Copper and zinc plates

Question 3 of 20

Question 4 of 20

4. What is the voltage across a 6 Ω resistor when 3A of current passes through it?

1.18V

2.36V

3.9V

4.2V

Question 4 of 20

Question 5 of 20

5. When resistances are connected in series, the current passing through them is:

1.Different

2.Zero

3.Not the same

4.The same

Question 5 of 20

Question 6 of 20

6. When we double the voltage in a simple electric circuit, we double the:

1.Power

2.Current

3.Resistance

4.Both a and b

Question 6 of 20

Question 7 of 20

7. What happens to the intensity or the brightness of the lamps are added:

1.Decreases

2.Cannot be predicted

3.Remains the same

4.Increases

Question 7 of 20

Question 8 of 20

8. The unit of current in known as:

1.Volt

2.Electron

3.Ohm

4.Ampere

Question 8 of 20

Question 9 of 20

9. Which is not true?

1.1 m A = 1 c 10³ ohm

2.1 mega ohm = 1 x 10⁶ ohm

3.The value of R (resistance) is different for each conductor

4.The property which opposes the flow of current through a conductor is called its resistance

Question 9 of 20

Question 10 of 20

10. Electric potential and e.m.f:

1.Have different unit

2.Both b and c

3.Are the different terms

4.Are the same terms

Question 10 of 20

Question 11 of 20

11. The resistance of a wire is _____________ to its cross-section area:

1.Inversely proportional

2.Not equal

3.Directly proportional

4.Equal

Question 11 of 20

Question 12 of 20

12. An electric current in conductors is due to the flow of:

1.Negative ions

2.Free electrons

3.Positive ions

4.Positive charges

Question 12 of 20

Question 13 of 20

13. The combined resistance of two identical resistors, connected in series is 8 Ω. Their combined resistance in a parallel arrangement will be:

1.4 Ω

2.12 Ω

3.2 Ω

4.8 Ω

Question 13 of 20

Question 14 of 20

14. The equivalent resistance of a parallel combination is:

1.None of these

2.Equal to the sum of all the resistance

3.Is greater than the larger resistance of the combination

4.Is smaller than the smallest resistance of the combination

Question 14 of 20

Question 15 of 20

15. Which of the following has the lowest specific resistance?

1.Platinum

2.Copper

3.Aluminium

4.Silver

Question 15 of 20

Question 16 of 20

16. What is the power rating of a lamp connected to a 12 V source when it carries 2.5A?

1.30 W

2.4.8 W

3.14.5 W

4.60 W

Question 16 of 20

Question 17 of 20

17. As the temperature of a conductor rises, its resistance:

1.None of these

2.Decreases

3.Increases

4.Does not change

Question 17 of 20

Question 18 of 20

18. Why should household appliances be connected in parallel with the voltage source?

1.To provide each appliance the same current as the power source

2.To decrease the resistance of the circuit

3.To provide each appliance the same voltage as the power source

4.To increase the resistance of the circuit

Question 18 of 20

Question 19 of 20

19. Current Flows through the filament of bulb due to:

1.Neutrons

2.x-rays

3.Free electrons

4. Protons only

Question 19 of 20

Question 20 of 20

20. Which statement is not true? In the equation V = IR:

1.The value of R is the same for every conductor

2.The value of R is different for different conductors

3.R is called the resistance of conductor

4.R is a proportionality constant

Question 20 of 20

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