Which of the following statements about the Galilean telescope is not correct?

• A. the final image is inverted
• B. it is shorter than terrestial telescope
• C. the final image is erect
• D. it has a small field of view

Which of the following is a pure semiconductor?

• A) carbon
• B) silicon
• C) transistor
• D) phosphorus

The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

• A. 20
• B. 25
• C. 50
• D. 200

A swinging pendulum between the rest position and its maximum displacement possesses

• A. Kinetic energy only
• B. potential energy only
• C. gravitational energy only
• D. both kinetic and potential energy

(a)  Briefly explain the following terms:

(i)  emission line spectra;

(ii)   line absorption spectra.

(b) Draw a labeled diagram showing the structure of a simple type of photocell and explain its mode of operation.

(c) Statetwo

      (i)  reasons to show that x-rays are waves;

       (ii)  uses of x-rays other than in medicine.

(d) An electron jumps from an energy level of -1.6eV to one of -1.4eV in an atom.  Calculate the energy and wavelength of the emitted radiation. [ h = 6.6 x 10\(^{-34}\)Js; c = 3.00 x 10\(^8\)ms\(^{-1}\);eV = 1.6 x 10\(^{-19}\) J ]  

Electrons were discovered by

• A. Dalton
• B. James Charwick
• C. J.J. Thompson
• D. Niels Bohr

Which of the following statements about a three-pin plug is/are correct. i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth wire is coloured blue

• A. i only
• B. ii only
• C. i and ii only
• D. i, ii and iii

What is the length of liquid column in a barometer tube that would support an atmospheric pressure of 102000Nm^-2 if the density of the liquid is 2600kgm^-3? [g = 10ms^-2]

• A. 0.75m
• B. 0.76m
• C. 3.92m
• D. 39.23m

Total internal reflection will not occur when light travels from

• A. water to air
• B. water into glass
• C. glass to air
• D. glass into water

A force acting on a body causes a change in the momentum of the body from 12kg ms^-1 to 16kg ms^-1 in 0.2s. calculate the magnitude of the force

• A. 140.0N
• B. 20.0N
• C. 4.0N
• D. 0.8N