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

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Question 1 of 20

Physics

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

1.Current

2.Resistance

3.Both a and b

4.Power

Question 1 of 20

Question 2 of 20

2. Electric potential and e.m.f:

1.Are the same terms

2.Have different unit

3.Both b and c

4.Are the different terms

Question 2 of 20

Question 3 of 20

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

1.Negative ions

2.Positive ions

3.Free electrons

4.Positive charges

Question 3 of 20

Question 4 of 20

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

1.Equal

2.Not equal

3.Directly proportional

4.Inversely proportional

Question 4 of 20

Question 5 of 20

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

1.Halves

2.Quarter

3.Doubles

4.Remains unchanged

Question 5 of 20

Question 6 of 20

6. The equivalent resistance of a parallel combination is:

1.Is smaller than the smallest resistance of the combination

2.Is greater than the larger resistance of the combination

3.Equal to the sum of all the resistance

4.None of these

Question 6 of 20

Question 7 of 20

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

1.Free electrons

2.Neutrons

3. Protons only

4.x-rays

Question 7 of 20

Question 8 of 20

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

1.Silver

2.Copper

3.Platinum

4.Aluminium

Question 8 of 20

Question 9 of 20

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

1.To decrease the resistance of the circuit

2.To increase the resistance of the circuit

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

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

Question 9 of 20

Question 10 of 20

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

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

2.R is called the resistance of conductor

3.R is a proportionality constant

4.The value of R is different for different conductors

Question 10 of 20

Question 11 of 20

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

1.Not the same

2.Different

3.Zero

4.The same

Question 11 of 20

Question 12 of 20

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

1.Only positive charge

2.None of these

3.Only negative charge

4.Both positive and negative charge

Question 12 of 20

Question 13 of 20

13. The first battery made in 1800 consisted of:

1.Copper and zinc plates

2.Copper and zinc plates soaked in saltwater

3.Copper plates only

4.Zinc plates only

Question 13 of 20

Question 14 of 20

14. The unit of current in known as:

1.Volt

2.Ampere

3.Ohm

4.Electron

Question 14 of 20

Question 15 of 20

15. Which is not true?

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

2.1 m A = 1 c 10³ ohm

3.1 mega ohm = 1 x 10⁶ ohm

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

Question 15 of 20

Question 16 of 20

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

1.Remains the same

2.Decreases

3.Cannot be predicted

4.Increases

Question 16 of 20

Question 17 of 20

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

1.9V

2.36V

3.18V

4.2V

Question 17 of 20

Question 18 of 20

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

1.8 Ω

2.2 Ω

3.4 Ω

4.12 Ω

Question 18 of 20

Question 19 of 20

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

1.14.5 W

2.4.8 W

3.30 W

4.60 W

Question 19 of 20

Question 20 of 20

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

1.Decreases

2.None of these

3.Increases

4.Does not change

Question 20 of 20

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