Physics

1. When the key K is passed at t = 0, which of the following statements about the current 1 in the resistor AB of the given circuit is ture?

I = 1mA at all t

I = 2mA at all t

I oscillates between 1mA and 2mA

At t = 0, I = 2mA and with time it goes to 1mA

Question 1 of 15

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

Current only

Drift speed only

Current, electric field and drift speed

Current and drift speed

Question 2 of 15

3. 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

5 x 10⁻⁴ Ω

3.5 x 10⁻⁴ Ω

10 x 10⁻⁴ Ω

2.5 x 10⁻⁴ Ω

Question 3 of 15

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

250 ohms

300 ohms

100 ohms

350 ohms

Question 4 of 15

5. 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:

1:2

3:1

4:1

1:4

Question 5 of 15

6. 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 > 3 > 1 > 2

1 > 2 > 3 > 4

3 > 1 > 2 > 4

4 > 2 > 1 > 3

Question 6 of 15

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

1/0.9 A

0.9 A

9 A

1/9 A

Question 7 of 15

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

None of these

Vessel of the cell

Electrodes of the cell

Electrolyte used in the cell

Question 8 of 15

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

2 Ω

6 Ω

8 Ω

4 Ω

Question 9 of 15

10. 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 10 of 15

11. 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

0.04 A

0.03 A

0.01 A

Question 11 of 15

12. 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 = R₁R₂/(R₂ – R₁)

R = R₁R₂/(R₁ – R₂)

R = R₂ – R₁

Question 12 of 15

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

16 R

4 R

2 R

Zero

Question 13 of 15

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

1.8 A

0.2 A

0.8 A

1.6 A

Question 14 of 15

15. The current in the given circuit is:

0.3 amp

0.4 amp

0.1 amp

0.2 amp

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

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