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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.

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1,511.

The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface

19^o

21^o

39^o

42^o

View answer & explanation

Correct answer is D

Sin C = $\frac{1}{\eta} = \frac{1}{1.5} = 0.6667$

C = sin $^{-1}$ 0.6667

= 42°

1,512.

At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?

at the centre of curvature

at the principal focus

between the pole and principal focus

between the centre of curvature and principal focus

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,513.

The equation of a certain progressive transverse wave is y = 2 sin 2 $\pi ( \frac{t}{0.01} - \frac{x}{30})$ , where x and y are in cm and t in seconds. Calculate the period of the wave.

0.001s

0.010s

10.000s

100.000s

View answer & explanation

Correct answer is B

Compare: Y = 2 sin 2 $\pi (\frac{t}{0.01} - \frac{x}{30})$

with the wave equation,

y = A sin 2 $\pi (\frac{t}{T} - \frac{x}{\lambda}$ )

⇒ $\frac{t}{T} = \frac{t}{0.01}$

T = 0.010s

1,514.

When salt is dissolved in water, the freezing point of the water

increases

decreases

remains the same

increases and later decrease

View answer & explanation

Correct answer is B

The salt in the water (same for any other impurities) lowers the freezing point of the solution so that water freezes at a lower temperature.

1,515.

An electric heater has a resistance of 50 $\Omega$ . When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings

4200J

1600J

24000J

96000J

View answer & explanation

Correct answer is D

Q = I2RT

= 42 x 50 x 2 x 60

= 96000J

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