NEET Physics: Questions 465 - 468 of 2098

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Question number: 465

» Current Electricity » Electrical Resistance

MCQ▾

Question

In the circuit shown, the galvanometer G reads zero. If batteries have negligible internal resistances, the value of resistance X will be –

Circuit diagram with resistors, battery, and galvanometer.

Circuit Diagram With Resistors, Battery, and Galvanometer.

In figure X is the unknown resistor and other components are mentioned.

Choices

Choice (4) Response

a.

500 Ω

b.

200 Ω

c.

10 Ω

d.

100 Ω

Question number: 466

» Current Electricity » Temperature Dependence of Resistance

Assertion-Reason▾

Assertion (Ꭺ)

The temperature coefficient of resistance is positive for metals and negative for p-type semiconductor.

Reason (Ꭱ)

The effective charge carriers in metals are negatively charged whereas in p-type semiconductor they are positively charged.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

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: 467

» Current Electricity » Kirchhoff's Laws

MCQ▾

Question

If V B - V A = 4 V in the given figure, then resistance X will be

Circuit diagram consist of two battery and two resistors

Circuit Diagram Consist of Two Battery and Two Resistors

Here in figure between point A and B 5V battery and 10Ω resistor connected in series and parallel to them 2v battery and one unknown resistor connected series.

Choices

Choice (4) Response

a.

5 Ω

b.

20 Ω

c.

10 Ω

d.

15 Ω

Question number: 468

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

The reading of voltmeter in the following circuit will be-

Circuit Diagram of 20Ω and 80Ω resistors, voltmeter and battery

Circuit Diagram of 20Ω and 80Ω Resistors, Voltmeter and Battery

Here in figure 20Ω and 80Ω resistors and battery connected in series. Voltmeter connected across the 80Ω resistors, internal resistance of voltmeter is also 80Ω.

Choices

Choice (4) Response

a.

0.80 volt

b.

2 volt

c.

1.60 volt

d.

1.33 volt

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