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.

2,691.

Dispersion of light by a glass prism is due to the

A.

different colours of the glass

B.

different speeds of the various colours in glass

C.

defects in the glass

D.

high density of glass

Correct answer is B

No explanation has been provided for this answer.

2,692.

When a yellow card is observed through a blue glass, the card would appear.

A.

black

B.

green

C.

red

D.

white

Correct answer is A

No explanation has been provided for this answer.

2,693.

A far sighted person cannot see objects that are less than 100cm away. If this person wants to read a book at 25cm, what type and focal length of lens does he need?

A.

convex, 20cm

B.

concave, 20cm

C.

convex, 33cm

D.

concave, 33cm

Correct answer is D

No explanation has been provided for this answer.

2,694.

The plane mirrors in a kaleidoscope are usually placed

A.

at an angle of 60o

B.

parallel to one another

C.

perpendicular to one another

D.

at an angle of 45o

Correct answer is A

No explanation has been provided for this answer.

2,695.

The magnification of the image of an object placed in front of a convex mirror is \(\frac{1}{3}\). If the radius of curvature of the mirror is 24cm, what is the distance between its object and its image?

A.

8cm

B.

16cm

C.

24cm

D.

32cm

Correct answer is D

F = uv ; v = 1u

12 = \(\frac{v + 3v}{v + 3v}\)

v = 16cm, u = 48cm

distance between U and V

= 48 - 16 =32cm