Physics Past Questions and Answers

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

A Red and blue
B Orange and green
C Red and indigo
D Violet and green
E Yellow and red

Question 12:

Which of the following is/are TRUE of nuclear fission?

I. A heavy nucleus is split into two nuclei of comparable masses
II. Two light nuclei are joined together to form a heavier nucleus
III. The total mass of the products is less than that of the reactants

A I only
B II only
C III only
D I and III only
E II and III only

Question 13:

The image obtained on the screen of a pin-hole camera becomes less sharply defined when the ____________

A Object is moved farther from the pin-hole
B Screen is moved farther from the pin-hole
C Object is made smaller
D Illumination is made more intense
E Pin-hole is made larger.

Question 14:

Which of the following statements about evaporation and boiling is FALSE?

A Evaporation may take place at any temperature.
B In evaporation, vapour escapes only from the surface of a liquid
C The temperature remains constant as long as the liquid is boiling
D The temperature at which boiling takes place can be altered by changing the external pressure
E The rate of evaporation does not depend on temperature.

Question 15:

Which of the following is/areNOT affected by a magnetic field?

I. Alpha particle
II. Cathode rays
III. Neutrons

A I only
B II only
C III only
D I and II only
E I,II & III