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.

3,461.

Which of the following statements is correct about cathode rays? They are fast moving

A.

atoms

B.

ions

C.

neutrons

D.

protons

E.

electrons

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

3,462.

lf the frequency of the a.c. circuit illustrated is 500Hz/ π what would be the reactance in the circuit?

A.

0.01Ω

B.

190.91 Ω

C.

200.00 Ω

D.

795.46 Ω

E.

1000.00Ω

View answer & explanation

Correct answer is C

C1 + C = 2 + 3 = 5μF

Capacitive reactance =
1/2πfc

X =
1/2π x 500 x 5 x 10-6
= 200

3,463.

What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?

A.

q2/4πεor2

B.

q/4πεor2

C.

q2/4πεor

D.

qr/4πεo

E.

4πεoq2r

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

3,464.

The diagrams above show lines of force in electric fields. In which of the diagrams would a positive test charge experience the least force as it moves from x to y?

A.

I only

B.

II only

C.

III only

D.

I and II only

E.

II and III only

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

3,465.

Calculate the energy stored in 20μF capacitor if the potential difference between the plates is 40 V.

A.

3.2 x10-2J

B.

1.6x102J

C.

8.0x10-4J

D.

4.0x10-4J

E.

2.0x10-4J

View answer & explanation

Correct answer is B

E = 1/2cv2 = 1/2 x 10 x 10-6 x 402 = 1.6 x 10-2J


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