Current Electricity [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 38 - 41 of 291

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Question 38

Question Assertion-Reason▾

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

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Question 39

Question MCQ▾

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

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Question 40

Question MCQ▾

For the circuit shown in the figure

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 RL is 18 V
  2. The current I through the battery is 7.5 mA
  3. Ratio of powers dissipated in R1 and R2 is 3
  4. If R1 and R2 are interchanged magnitude of the power dissipated in RL 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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Question 41

Question MCQ▾

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.

Question does not provide sufficient data or is vague

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