Question 456:

• JAMB 1987

Which of the following instruments has a pure tone?

A. Guitar
B. Vibrating strings
C. Tuning fork
D. Siren

Question 457:

• JAMB 1987

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz?

A. 1
B. 2
C. 3
D. 4

Question 458:

• JAMB 1987

Which of the following statements supports the assumption that light travels in straight lines?

A. Light can be diffracted
B. A source of light produces distinct shadows of opaque objects
C. A source of light produces interference patterns on a suitably placed screen
D. Light can be reflected

Question 459:

• JAMB 1987

When the length I of a piece of wire under constant tension is varied, the relationship of the frequency of the vibration f\(\alpha\)/ is

A. F\(\alpha\)/
B. F\(\alpha \frac{1}{I^2}\)
C. F \(\alpha\sqrt I\)
D. F\(\alpha \frac{1}{1}\)

Question 460:

• JAMB 1987

If an object is placed in front of two mirrors inclined at 90^o, how many images will be formed?

A. Five
B. Four
C. Three
D. Two