NEET Physics: Questions 1007 - 1010 of 2098

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Question number: 1007

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

A series LCR arrangement with X L =80Ω, X C = 50Ω, R = 40Ω is applied across a. c. source of 200 V. Choose the correct options.

(1) Wattless current = 3.2 A

(2) Power current = 3.2 A

(3) Power factor = 0.6

(4) Impedance of circuit = 50 Ω

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

Question number: 1008

» Electromagnetic Waves » Electromagnetic Spectrum » Ultraviolet

Assertion-Reason▾

Assertion (Ꭺ)

Ultraviolet radiations are of higher frequency waves and are dangerous to human being.

Reason (Ꭱ)

Ultraviolet radiations are absorbed by the atmosphere.

Choices

Choice (4) Response

a.

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

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 1009

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor is approximately

Choices

Choice (4) Response

a.

0.1

b.

0.30

c.

0.2

d.

0.4

Question number: 1010

» 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

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