Physics Past Questions and Answers

A transverse wave is applied to a string whose mass per unit length is 3 x 10^-2kgm^-1. If the string is under a tension 12N, the speed of the propagation of the wave is

A 5 ms^-1
B 20 ms^-1
C 30 ms^-1
D 40 ms^-1

Question 42:

An engineer intends to deviate a light ray from its path by 120^o through reflection from a plane mirror. Calculate the angle of incidence

A 60^o
B 40^o
C 30^o
D 20^o

Question 43:

The diagram above shows a maximum and minimum thermometer divided into three portions P, Q and R. Which of the following is true about the respective content of P,Q and R

A Alcohol, mercury and alcohol
B Air, alcohol and mercury
C Mercury, alcohol and mercury
D Air, mercury and alcohol

Question 44:

The diagram above shows two capacitors P and Q of capacitance 5Î¼F and 10Î¼F. Find the charges stored in P and Q respectively

A 2Î¼C and 4Î¼C
B 4μC and 2μC
C 100Î¼C and 200Î¼C
D 200Î¼C and 100Î¼C

Question 45:

In the diagram above a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b and c respectively represents?

A Red, green and blue
B Green, red and blue
C Yellow , blue and red
D Blue , yellow and red