Punjab 12th Class Physics Chapter 2 Current Electricity Mcqs Test Online

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Question 1 of 9

Physics

1. A wire of uniform cross-section. A length L resistance R is cut into two equal parts. The resistivity of each part will be:

1.Remain the same

2.Halved

3.One fourth

4.Doubled

Question 1 of 9

Question 2 of 9

2. Thermocouple is an arrangement of two different metals:

1.To convert heat energy in to electrical energy

2.To produce more heat

3.To convert heat energy into chemical energy

4.To convert electric energy in to heat energy

Question 2 of 9

Question 3 of 9

3. Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

1.R/3 Ω

2.2R/3 Ω

3.3 R Ω

4.2R/4 Ω

Question 3 of 9

Question 4 of 9

4. Thermocouple is an arrangement of two different metals:

1.4:3

2.2:1

3.1:3

4.1:2

Question 4 of 9

Question 5 of 9

5. The resistivity of two wires is p₁ and p₂ which are connected in series. If there dimensions are same then the equivalent resistivity of the combination will be:

1.p₁/p₂

2.(p₁ + p₂)

3.p₁ + p₂/2

4.1/p₁ + 1/p₂

Question 5 of 9

Question 6 of 9

6. Seven resistances are connected as shown in the figure. The equivalent resistance between A and B is:

1.4Ω

2.5Ω

3.4.5Ω

4.3Ω

Question 6 of 9

Question 7 of 9

7. When a wire is stretched and its radius becomes r/2, then its resistance will be:

1.2 R

2.16 R

3.0

4.4 R

Question 7 of 9

Question 8 of 9

8. Calculate current in 2Ω resistor:

 

1.0.73 A

2.1 A

3.1.43 A

4.1.29 A

Question 8 of 9

Question 9 of 9

9. 10⁶ electrons are moving through a wire per second, the current developed is:

1.10⁶ A

2.1.6 x 10⁻¹⁹ A

3.1.6 x 10⁻¹³ A

4.1 A

Question 9 of 9

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