NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 491 - 495 of 2320

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Passage

In the circuit shown in the figure,

5Ω resistor and 1Ω internal resistance of battery of 12 V

5Ω Resistor and 1Ω Internal Resistance of Battery of 12 V

Question number: 491 (3 of 3 Based on Passage) Show Passage

» Current Electricity » Series and Parallel Combinations of Resistors

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MCQ▾

Question

Rate of conversion of chemical energy within the battery is

Choices

Choice (4)Response

a.

24W

b.

14W

c.

20W

d.

4W

Question number: 492

» Current Electricity » Potentiometer

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MCQ▾

Question

In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be value of x if the radius of cross-sectional area the wire AB is doubled

Circuit diagram of potentiometer experiment

Circuit Diagram of Potentiometer Experiment

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 493

» Current Electricity » Electrical Resistivity

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The resistivity of a semiconductor decreases with temperature.

Reason (Ꭱ)

The atoms of a semiconductor vibrate with larger amplitude at higher temperatures thereby increasing its resistivity.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 494

» Current Electricity » Resistances of Different Materials

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MCQ▾

Question

The shunt required for 10 % of main current to be sent through the moving coil galvanometer of resistance 99 Ω will be

Choices

Choice (4)Response

a.

11 Ω

b.

9.9 Ω

c.

90 Ω

d.

0.9 Ω

Question number: 495

» Current Electricity » Series and Parallel Combinations of Resistors

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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

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.

1 and 2

b.

1 and 3

c.

1,2 and 3

d.

2 and 4

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