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.

2,026.

In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. Calculate the focal length of the eye lens

A.

0.3cm

B.

2.7cm

C.

3.4cm

D.

8.3cm

Correct answer is C

\(\frac{1}{f} = \frac{1}{u} + \frac{1}{v} = \frac{1}{3} - \frac{1}{25} = \frac{22}{75}\)

f = 3.4cm

2,027.

A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens

A.

10.00cm

B.

6.00cm

C.

5.00cm

D.

1.50cm

Correct answer is B

\(\frac{1}{u} + \frac{1}{v} = \frac{1}{f} = \frac{1}{15} + \frac{1}{10}\)

u = 6.00

2,028.

The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium

A.

68o

B.

56o

C.

34o

D.

18o

Correct answer is C

c = \(\sin^{-1} \frac{1}{n} = \sin^{-1} \frac{1}{1.8} = 34^o\)

2,029.

The size of the hole of a pin hole camera is increased. The resultant image formed becomes

A.

sharper

B.

reduced in size

C.

enlarged

D.

blurred

Correct answer is D

No explanation has been provided for this answer.

2,030.

In the wave equation y = Eo, sin(299t - \(\pi\)), Eo represents the

A.

amplitude

B.

frequency

C.

period

D.

wavelength

Correct answer is A

No explanation has been provided for this answer.