NEET Physics: Questions 492 - 495 of 2142

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Question number: 492

» Current Electricity » Electrical Resistivity

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 true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 493

» Current Electricity » Resistances of Different Materials

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.

90 Ω

b.

0.9 Ω

c.

9.9 Ω

d.

11 Ω

Question number: 494

» 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: 495

» 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

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