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Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

3,356.

The effective capacitance between points X and Y in the diagram below is 1.0μF, What is the value of the capacitance C, measured in micro-farad?

A.

5.0μF

B.

4.0μF

C.

3.0μF

D.

1.0μF

E.

0.5μF

Correct answer is D

No explanation has been provided for this answer.

3,357.

The energy stored in a capacitor of capacitance 5μF is 40J. Calculate the voltage applied across its terminals?

A.

4000V

B.

200V

C.

16V

D.

6V

E.

4V

Correct answer is A

E=CV22

V2=2EC

V2=2×405×106

V2=16×106

V=4×103=4000v

3,358.

A capacitor of capacitance 25μF is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor

A.

0.01

B.

0.02

C.

50.00

D.

100.00

E.

200.00

Correct answer is D

No explanation has been provided for this answer.

3,359.

If the current in the resistor R in diagram above is 0.05A, calculate the p.d. across the inductor.

A.

2.5V

B.

25.0V

C.

49.0V

D.

50.0V

E.

250.0V

Correct answer is A

V= i × l

Xl = inductive reactance → 50

I = current → 0.05A
V = 0.05 × 50

V = 2.5volt

3,360.

Calculate the inductive reactance of the circuit shown above.

A.

50.00

B.

5.00

C.

0.50

D.

0.05

E.

0.02

Correct answer is A

No explanation has been provided for this answer.