Physics - Mock Test 30

Question 291

An inductor may store energy in?

A) its electric field B) its coils C) its magnetic field D) both electric and magnetic fields

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Question 292

Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in?

A) Each increases B) Each decreases C) Each remains the same D) One increases whereas that in the other decreases

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Question 293

a voltage V = V?

A) V?/?2R B) V?/?2?R C) V?2/?2R D) V?2/?2?R

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Question 294

In an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then?

A) V = VR+VL+VC B) V2 = VR2+VL2+VC2 C) V2 = VL2+(VR-VC) 2 D) None of these

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Question 295

The phase angle between the voltage and the current in an AC circuit consisting of a resistance is?

A) Zero B) 45? C) 90? D) 180?

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Question 296

Choose the correct statement. In the case of AC circuit ohms law holds for?

A) Peak values of voltage and current B) Effective values of voltage and current C) Instantaneous values of voltage and current D) All of the above

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Question 297

A choke is used as a resistance in?

A) DC circuit B) AC circuits C) Both AC and DC circuit D) Full wave rectifier circuit

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Question 298

The frequency of a circuit consisting of a capacitance C and a resistor R is 1⃣ C/R 2⃣ R/C 3⃣ 1/RC 4⃣ 1/ ?

A) C/R B) R/C C) 1/RC D) 1/ ??RC

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Question 299

What is the self inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1?

A) 0.5 mH B) 0.5H C) 2.0H D) 8.0H

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Question 300

Ammeter connected in an AC circuit measures?

A) Exact value of current B) rms value of current C) Net value of current D) Peak value of current

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