A stone is projected vertically upward with a speed of 30ms\(^{1}\) from the top of a tower of height 50 m. Neglecting air resistance, determine the maximum height it reached from the ground. [g = 10 ms\(^-2\)]

Which of the following statements about the molecules of solids and liquids is correct? They both

• A. have weak attraction.
• B. have wide separations.
• C. exhibit random motion.
• D. exhibit vibratory motion.

At which of the following distances from the lens should a slide be placed on a slide projector if f is the focal length of the projector length?

• A. less than f
• B. greater than f but less than 3f
• C. equal to f
• D. equal to 2f

I. Mass

II. Density

III. Temperature

IV. Nature of substance

Which of the above affect diffusion?

• A) I and II only
• B) I,II and IV only
• C) II, III and IV only
• D) I, II, III and IV

Two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period

• A. 0.5s
• B. 1.0s
• C. 1.2s
• D. 2.0s

I. Low pressure. II. High pressure. III. High p.d. IV. Low p.d. Which combination of the above is true of the conduction of electricity through gases?

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

The earth is not a perfect sphere because its equatorial axis is longer than the polar axis. where on the earth's surface would an object have its greatest weight?

• A. half way between the equator and the north pole
• B. near the equator
• C. half way between the equator and the south pole
• D. at either pole

What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?

• A. 21^o
• B. 22^o
• C. 23^o
• D. 24^o

(a) Explain thermiopic emission

(b) State two applications of electrical conduction through gases.

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

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