Physics Past Questions and Answers

Which property of a wave remains constant when the wave travels from one medium into another?

A Amplitude
B Wavelength
C Velocity
D Frequency

Question 1892:

The anomalous expansion of water occurs in the range

A 0 °C to 100 °C
B 0 °C to 4 °C
C 4 °C to 100 C
D -4 °C to 0 °C

Question 1893:

A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

A 48.6°
B 19.5°
C 20.0
D 45.0

Question 1894:

A rectangular piece of iron measuring 4 cm by 3 cm at 20\(^o\)C is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10\(^{-5}\) K\(^{-1}\)]

A 12.0144 cm\(^3\)
B 12.0346 cm\(^3\)
C 12.0288 cm\(^3\)
D 12.0173 cm\(^3\)

Question 1895:

Two bodies of masses 3.0 kg and 2.0 kg are separated by a distance of 50 cm. Calculate the force of attraction between them. [G = 6.67 x 10\(^{-11}\) Nm\(^2\) kg\(^2\)]

A 1.6 x 10\(^{-9}\)N
B 1.3 x 10\(^{3}\)N
C 2.3 x 10\(^{3}\)N
D 5.0x 10\(^{3}\)N