Physics

1. 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 – R₁

R = R₂ x (R₁ + R₂)/ (R₂ – R₁)

R = R₁R₂/(R₁ – R₂)

R = R₁R₂/(R₂ – R₁)

Question 1 of 15

2. A potentiometer is connected between A and B and the balance point is obtained at 203.6 cm. When the end of the potentiometer connected to B is shifted to C, then the balance point is obtained at 24.6 cm. If now the potentiometer be connected between B and C, the balance point will be at

197.2 cm

228.0 cm

212.0 cm

179.0 cm

Question 2 of 15

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

8 Ω

4 Ω

6 Ω

2 Ω

Question 3 of 15

4. Two resistances equal at 0°C with temperature coefficient of resistance α₁ and α₂ joined in series act as a single resistance in a circuit. The temperature coefficient of their single resistance will be:

α₁ + α₂/2

α₁α₂/ α₁+α₂

α₁ - α₂/2

α₁ + α₂

Question 4 of 15

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

4 R

16 R

2 R

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

3.5 x 10⁻⁴ Ω

5 x 10⁻⁴ Ω

10 x 10⁻⁴ Ω

2.5 x 10⁻⁴ Ω

Question 6 of 15

7. When the power delivered by a 100 volt battery is 40 watts the equivalent resistance of the circuit is:

100 ohms

300 ohms

250 ohms

350 ohms

Question 7 of 15

8. 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:

4:1

3:1

1:2

1:4

Question 8 of 15

9. What is the equivalent resistance across A and B in the figure shown, if R = 3Ω?

15 Ω

8 Ω

9 Ω

12 Ω

Question 9 of 15

10. 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

4 > 3 > 1 > 2

3 > 1 > 2 > 4

1 > 2 > 3 > 4

Question 10 of 15

11. A battery of e.m.f. 20 V and internal resistance 6Ω is connected to a resistor as shown in figure. If the current in the circuit is 1 amp, the resistance of the resistor will be:

14 Ω

28 Ω

16 Ω

7 Ω

Question 11 of 15

12. In the figure shown, the capacity of the condenser C is 2μF. The current in 2Ω resistance is

0.9 A

1/0.9 A

9 A

1/9 A

Question 12 of 15

13. The internal resistance of a cell is the resistance of:

Vessel of the cell

None of these

Electrodes of the cell

Electrolyte used in the cell

Question 13 of 15

14. Two filaments of same length are connected first in series then in parallel. For the same amount of main current flowing, the ratio of the heat produced is:

2:1

4:1

1:4

1:2

Question 14 of 15

15. 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

Zero

Less

None of these

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

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

Physics

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