Question 546:

• JAMB 1989

When a yellow card is observed through a blue glass, the card would appear.

A. Black
B. Green
C. Red
D. White

Question 547:

• JAMB 1989

Dispersion of light by a glass prism is due to the

A. Different colours of the glass
B. Different speeds of the various colours in glass
C. Defects in the glass
D. High density of glass

Question 548:

• JAMB 1989

Which of the following pairs is NOT part of the electromagnetic spectrum? i. Radio waves. ii. Beta rays. iii. Gamma rays. iv. Alpha rays

A. I and ii
B. Iii and iv
C. I and ii
D. Ii and iv

Question 549:

• JAMB 1989

Two insulated charged spheres of different sizes and carrying opposite charges are connected together by a metallic conductor. Current will flow from one sphere to the other until both sphere

A. Carry the same magnitude and sign of charge
B. Are at the same potential
C. Are at the same temperature
D. Are of the same size

Question 550:

• JAMB 1989

When a number of identical small magnets are arranged in a line, the strength of the resultant magnet

A. Ia largest when they are arranged end to end
B. Is greatest when they are arrangedparallel with like poles adjacent to each other
C. Depends only on the number of magnets provided they arev parallel
D. Is greater when the magnets are arranged on a wooden surface than on a metaln surface