Which of the following is a derived unit?

• A. Ampere
• B. Kilogramme
• C. Second
• D. Ohm

A rectangular piece of iron measuring 4 cm by 3 cm at 20\(^o\)C is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10\(^{-5}\) K\(^{-1}\)]

• A. 12.0144 cm\(^3\)
• B. 12.0346 cm\(^3\)
• C. 12.0288 cm\(^3\)
• D. 12.0173 cm\(^3\)

Which of the following metals will provide the greatest shield against ionizing radiation

• A. Iron
• B. Manganese
• C. Alminium
• D. Lead

(a) State two factors which affect the angle of deviation of a ray of light through a triangular glass prism.

(b) Seven virtual images of an object are formed when two plane mirrors are inclined at an angle 0 to each other. Calculate the value of 0.

(c) By means of a ripple tank, a student was able to generate series of transverse waves by varying the frequency of the dipper and all the waves so generated covered a distance of 0.80 m in 0.2s.

(i) Determine the speed, v, of the waves.

Copy and complete the table given in your answer booklet.

(iii) Plot a graph with f on the vertical axis and \(\lambda ^{-1}\) on the horizontal axis.

(iv) What does the slope of the graph represent?

If a light wave has a wavelength of 500nm in air what is the frequency of the wave? [c = 3 x 10⁸ ms^-1]

• A) 3.0 x 10¹⁴ Hz
• B) 6.0 x 10¹⁴ Hz
• C) 6.0 x 10¹² Hz
• D) 2.5 x 10¹⁴ Hz

(a) State the laws of electromagnetic induction.

(b) Draw a labelled diagram of a simple d.c. generator and explain how it works.

(c) State three methods by which higher e.m.f. could be obtained from the generator.

To produce an enlarged and erect image with a concave mirror,the object must be positioned

• A. at the principal focus
• B. beyond the centre of curvature
• C. between the principal focus and the centre of the curvature
• D. between the principal focus and the pole

Which of the following is the exclusive property of a transverse wave?

• A. diffraction
• B. refraction
• C. compression
• D. polarization

A wave that travels through stretched strings is known as

• A. electromagnetic wave
• B. micro wave
• C. mechanical wave
• D. seismic wave

Increasing the frequency of a sound wave produces a sound with

• A. higher pitch
• B. longer wavelength
• C. more overtones
• D. reduced loudness