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.

2,031.

A radio wave has a wavelength of 150m. If the velocity of radio waves in free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave

A.

4.50 x 1010Hz

B.

5.0 x 109Hz

C.

4.5 x 109Hz

D.

2.0 x 106Hz

Correct answer is D

f = \(\frac{V}{\lambda} = \frac{3 \times 10^8}{150}\)

= 2.0 x 10\(^6\) Hz

2,032.

A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resultimg wavelength is

A.

transverse

B.

longitudinal

C.

stationary

D.

electromagnetic

Correct answer is B

No explanation has been provided for this answer.

2,033.

What type of motion does the skin of a 'talking' drum perform when it is struck with a drum stick?

A.

Random

B.

Rational

C.

Translational

D.

vibratory

Correct answer is D

No explanation has been provided for this answer.

2,035.

Water of mass 120g at 50°C is added to 200g of water at 10°C and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A.

60oC

B.

40oC

C.

25oC

D.

10oC

Correct answer is C

120 x 4.2(50 - \(\theta\)) = 200 x 4.2(\(\theta\) - 10)

\(\theta = \frac{33600}{1344} = 25^oC\)