Current Electricity (NEET Physics): Questions 40 - 43 of 75

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Question number: 40

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

For the circuit shown in the figure

Circuit diagram with R1, R2 and R3 resistor

Circuit Diagram With R1, R2 and R3 Resistor

R1 = 2kΩ, R2 = 6kΩ and RL = 1.5kΩ are connected with 24V battery as shown in figure.

Select the correct answers and mark it according to the following codes:

  1. The potential difference across R L is 18 V
  2. The current I through the battery is 7.5 mA
  3. Ratio of powers dissipated in R 1 and R 2 is 3
  4. If R 1 and R 2 are interchanged magnitude of the power dissipated in R L will decrease by a factor of 9

Choices

Choice (4) Response

a.

2 and 4

b.

1, 2 and 3

c.

1 and 2

d.

1 and 3

Question number: 41

» Current Electricity » Electric Cell and Its Internal Resistance

MCQ▾

Question

An ammeter with internal resistance 90 Ω reads 1.85 A when connected in a circuit containing a battery and two resistors 700 Ω and 410 Ω in series. Actual current will be

Choices

Choice (4) Response

a.

Less than 1.85 A

b.

Greater than 1.85 A

c.

1.85 A

d.

All of the above

Question number: 42

» Current Electricity » Electric Cell and Its Internal Resistance

Assertion-Reason▾

Assertion (Ꭺ)

voltammeter measures current more accurately than ammeter.

Reason (Ꭱ)

Relative error will be small if measured from voltammeter.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 43

» Current Electricity » Potentiometer

MCQ▾

Question

A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire. The emf of the cells are in the ratio of

Choices

Choice (4) Response

a.

3: 1

b.

1: 2

c.

2: 1

d.

1: 1

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