Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 93 - 96 of 124

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Question number: 93

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

Assertion-Reason▾

Assertion (Ꭺ)

For an electric lamp connected in series with a variable capacitor and ac source, its brightness increases with increase in capacitance.

Reason (Ꭱ)

Capacitive reactance decreases with increase in capacitance of capacitor.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 94

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

An alternating current is more dangerous than the direct steady current.

Reason (Ꭱ)

The frequency of the alternating current is injurious the human body.

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 false

d.

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

Question number: 95

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

In an ac circuit, V and I are given by ,

. The average power dissipated in circuit is

Choices

Choice (4) Response

a.

2.5 watt

b.

10 4 watt

c.

10 watt

d.

0.025 watt

Question number: 96

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

This circuit will resonate at ω equal to,

In given figure is LCR circuit diagram

In Given Figure Is LCR Circuit Diagram

In figure inductor, capacitor and resistor connected in parallel with 200 V power supply.

Choices

Choice (4) Response

a.

200 rad s -1

b.

2000 rad s -1

c.

50 rad s -1

d.

500 rad s -1

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