NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 778 - 783 of 2142

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Question number: 778

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

Energy stored in an inductor is proportional to (i= current in the inductor)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 779

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

A resistor and a capacitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, applied voltage is,

Choices

Choice (4) Response

a.

12 V

b.

17 V

c.

13 V

d.

5 V

Question number: 780

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

If instantaneous current is given by amperes, then the r. m. s value of current is

Choices

Choice (4) Response

a.

4 ampere

b.

c.

zero ampere

d.

Question number: 781

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

An alternating current does not show any magnetic effect.

Reason (Ꭱ)

Alternating current varies with time.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

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: 782

» Experimental Skills » Screw Gauge

MCQ▾

Question

If linear density of a rod of length 4m varies as λ = 2 + x them the position of the center of gravity of the rod is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 783

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

A resistance of 20Ω is connected to a source of an alternating potential V = 220 sin (100πt). The time taken by the current to change from its peak value to r. m. s value is,

Choices

Choice (4) Response

a.

0.25 sec

b.

0.2 sec

c.

2.5 x 10 -3 sec

d.

25 x 10 -3 sec

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