Physics Past Questions and Answers

The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 108ms-1, then the frequency of the ultraviolet radiation is

A 1.3 x 1015Hz
B 7.5 x 105Hz
C 1.2 x 1011Hz
D 7.5 x 1014Hz

Question 412:

Which of the following is most strongly deflected by magnetic field?

A \(\gamma\) - rays
B X- particle
C \(\beta\) - particles
D X - rays

Question 413:

When a box of mass 45kg, is given an initial speed of 5ms-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms-2)

A \( \frac{5}{6} \)
B \( \frac{5}{12} \)
C \( \frac{1}{3} \)
D \( \frac{2}{3} \)

Question 414:

In fig 9 the value of R is

A 3â„¦
B 4Ω
C 5â„¦
D 6â„¦

Question 415:

if the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is

A 0.3A
B 0.8A
C 1.0A
D 1.8A