Physics

1. The temperature of the cold junction of a thermocouple is 0°C and the temperature of the hot junction is T°C. The relation for the thermo emf is given by; E = AT – ½ BT² (when A = 16 and B = 0.08). The temperature of inversion will be:

600°C

460°C

400°C

500°C

Question 1 of 15

2. A wire of radius r has resistance R. If it is stretched to a radius r/2, its resistance will be:

4 R

2 R

16 R

Zero

Question 2 of 15

3. Same length of two identical wires are first connected is series and then in parallel, then the amount of heat produced in both the conditions are in the ratio:

1:4

1:2

3:1

4:1

Question 3 of 15

4. In the given figure, the equivalent resistance between two points A and B will be:

2 Ω

8 Ω

4 Ω

6 Ω

Question 4 of 15

5. Two identical galvanometers are taken, one is to be converted into an ammeter and other into a milliammeter. Shunt of milliammeter compared to ammeter is

Less

None of these

Zero

Question 5 of 15

6. The resistance of a galvanometer is 50 Ω and current required to give full scale deflection is 100 μA in order to convert it into an ammeter for reading up to 10A. It is necessary to put an resistance of

2.5 x 10⁻⁴ Ω

3.5 x 10⁻⁴ Ω

5 x 10⁻⁴ Ω

10 x 10⁻⁴ Ω

Question 6 of 15

7. A moving coil galvanometer is converted into an ammeter reads up to 0.03 A by connecting a shunt of resistance 4r across it and ammeter reads up to 0.06 A, when a shunt of resistance r is used. What is the maximum current which can be sent through this galvanometer is no shunt is used?

0.02 A

0.01 A

0.04 A

0.03 A

Question 7 of 15

8. The electro-chemical equivalent of a substance in numerical equal to the mass of the substance deposited if a current I flows through the electrolyte for 0.25 seconds. The value of I is:

Question 8 of 15

9. Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R₁ and R₂ (R₂ > R₁). If the potential difference across the source having internal resistance R₂ is zero, then

R = R₂ x (R₁ + R₂)/ (R₂ – R₁)

R = R₂ – R₁

R = R₁R₂/(R₁ – R₂)

R = R₁R₂/(R₂ – R₁)

Question 9 of 15

10. The value of current i in the circuit as shown in figure is:

0.2 A

1.6 A

1.8 A

0.8 A

Question 10 of 15

11. A wire of length L is drawn such that its diameter is reduced to half of its original diameter. If the initial resistance of the wire were 10 Ω, its new resistance would be:

80 Ω

160 Ω

40 Ω

120 Ω

Question 11 of 15

12. A electric bulb marked 40 W and 200V, is used in a circuit of supply voltage 100V. Now its power is:

10 W

100 W

40 W

20 w

Question 12 of 15

13. The current in the given circuit is:

0.2 amp

0.1 amp

0.4 amp

0.3 amp

Question 13 of 15

14. Given a current carrying wire of non-uniform cross-section. Which one of the following is constant throughout the length of wire?

Current only

Current, electric field and drift speed

Drift speed only

Current and drift speed

Question 14 of 15

15. Four wires of the same diameter are connected in turn between two points, maintained at a constant potential difference. Their resistivities are; p and L (wire 1)., 1.2p and 1.2L (wire 2), 0.9 p and 0.9L (wire 3) and p and 1.5 L (wire 4). Rank the wires according to the rates at which energy is dissipated as heat, greatest first

4 > 2 > 1 > 3

1 > 2 > 3 > 4

3 > 1 > 2 > 4

4 > 3 > 1 > 2

Question 15 of 15

Test Name	Current Electricity, Thermal & Chemical Effect of Current MCQs Test
Subject	Physics
Test Type	MCQs
Total Question	15
Total Marks	30
Total Time	15 Mints
Test Help For	Physics Subject Test Prep. All Recruitment Test Prep. B Tech and BDS Test Prep. Medical Test prep. Engineering Test prep. All Admissions Test.

Test By Subject	Physics
Test By Topics	Physics Subject

Test Advisor

Current Electricity, Thermal & Chemical Effect of Current Test Online MCQs

Current Electricity, Thermal & Chemical Effect of Current Test Online MCQs

Physics

Leave a Reply Cancel reply