Jamb Physics 2003 Past Questions and Answers

Question 31:

• JAMB 2003

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

A. I and II only
B. II and III only
C. I, III, and IV only
D. II, III and IV only

Question 32:

• JAMB 2003

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

A. Blue and red
B. Green and yellow
C. Indigo and violet
D. Orange and red

Question 33:

• JAMB 2003

The most suitable cell used for short interval switches in electric bells is a

A. Lead- acid accumulator
B. Daniel cell
C. Leclanche cell
D. Nickel iron accumulator

Question 34:

• JAMB 2003

A ray incident on a glass prism undergoes minimum deviation when the

A. Incident angle is equal to the angle of refraction
B. Refraction angle equals 90^o
C. Incident angle equals 90^o
D. Incident angle is equal to the angle of emergence

Question 35:

• JAMB 2003

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later

A. 200 count / min
B. 100 count / min
C. 50 count / min
D. 25 count / min