NEET Physics: Questions 469 - 473 of 2098

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Question number: 469

» Current Electricity » Potentiometer

Assertion-Reason▾

Assertion (Ꭺ)

A potentiometer of longer length is used for accurate measurement.

Reason (Ꭱ)

The potential gradient for a potentiometer of longer length with a given source of emf becomes small.

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: 470

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

Which of the following statements are correct?

  1. Voltmeter should have high resistance.
  2. Ammeter should have low resistance.
  3. Voltmeter is placed in parallel across the conductor in a circuit.
  4. Ammeter is placed in parallel across the conductor in a circuit.

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

Choices

Choice (4) Response

a.

1 and 2

b.

2 and 4

c.

1, 2 and 3

d.

1 and 3

Passage

A battery is connected to a potentiometer obtained at 84 cm along the wire. When a resistance of 5Ω is connected as a shunt with the cell, the balance point is obtained at 70 cm.

Question number: 471 (1 of 3 Based on Passage) Show Passage

» Current Electricity » Potentiometer

MCQ▾

Question

Find the new position of the balance point when 5 Ω resistances is replaced by 4 Ω resistors.

Choices

Choice (4) Response

a.

52 cm

b.

67.2 cm

c.

83.3 cm

d.

26.5 cm

Question number: 472 (2 of 3 Based on Passage) Show Passage

» Current Electricity » Potentiometer

MCQ▾

Question

Calculate the internal resistance of the cell.

Choices

Choice (4) Response

a.

4 Ω

b.

5 Ω

c.

2 Ω

d.

1 Ω

Question number: 473 (3 of 3 Based on Passage) Show Passage

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

How can we change a galvanometer with R g = 20.0 Ω and I g = 0.00100 A into a voltmeter with a maximum range of 10.0 V?

Choices

Choice (4) Response

a.

By adding a resistance 8890 Ω in series with the galvanometer

b.

By adding a resistance 8890 Ω in parallel with the galvanometer

c.

By adding a resistance 9980 Ω . in parallel with the galvanometer

d.

By adding a resistance 9980 Ω in series with the galvanometer

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