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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.

3,666.

Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible

A.

12 V

B.

8 V

C.

2 V

D.

36 V

Correct answer is B

1/R = 1/R1 + 1/R2 = 1/3 + 1/6
= 3/6
∴ R = 6/3 = 2
E = I(R + r) = 4(2 + 0) = 8v

3,667.

If a light wave has a wavelength of 500nm in air what is the frequency of the wave?
[c = 3 x 108 ms-1]

A.

3.0 x 1014 Hz

B.

6.0 x 1014 Hz

C.

6.0 x 1012 Hz

D.

2.5 x 1014 Hz

Correct answer is B

f = c/λ

∴ f = c = 3 x 108
λ 500 x 10-9


=6.0 x 1014 Hz

3,669.

The wave phenomenon demonstrated in the diagram above is?

A.

reflection

B.

deflection

C.

diffraction

D.

refraction

Correct answer is C

Diffraction is spreading of wave after passing through a slit

3,670.

The pressure of two moles of an ideal gas at a temperature of 27oC and volume 10-2m3 is?
[R = 8.313 J mol-1K-1]

A.

4.99 x 105 Nm-2

B.

9.80 x 103 Nm-2

C.

4.98 x 103 Nm-2

D.

9.80 x 105 Nm-2

Correct answer is A

PV = nRT

∴ P = nRT = 2 x 8.313 x 300
_V ___10-2


= 4.987 x 105 Nm-2