CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively

• A. 2.38 x 10⁷W
• B. 7.92 x 10⁶W
• C. 3.96 x 10⁶W
• D. 2.64 x 10⁶W

(a) Explain the term critical angle.

(b) List two factors which determine the deviation of a ray of light by a triangular glass prism.

(c) The angle of refraction (r) of a ray of white light from air through a triangular glass prism of refractive index 1.5 is 29.0°. Calculate the angle through which the ray is least deviated.

(d) Study the ray diagram below and use it to answer the questions that follow.

Calculate the:

(i) values of angles P,Q and R;

(ii) refractive index n of the glass prism;

(iii) value of e;

(iv) total deviation D.

A body of weight W N rest on a smooth plane inclined at an angle\(\theta\)^o to the horizontal. What is the resolved part of the weight in Newtons along the plane?

• A. W sin\(\theta\)
• B. W cos\(\theta\)
• C. W sec\(\theta\)
• D. W tan\(\theta\)

A current of 0.5 A flows through a resistor when connected to a 40 V battery. How much energy is dispatched in 2 minutes?

• A. 2400 J
• B. 9600 J
• C. 1500 J
• D. 1200 J

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

• A. 17cm
• B. 20cm
• C. 25cm
• D. 100cm

A wave disturbance travelling in air enters a medium in which its velocity is less than that in air. Which of the following statements is true about the wave medium?

• A. both the frequency of the wave and the wavelength are decreased
• B. the frequency of the wave is decreased while the wavelength is increased
• C. the frequency of the wave is unaltered while the wavelength is decreased
• D. the frequency of the wave is decreased while the wavelength is unaltered

The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--

• A. 3.0 x 10\(^{-5}\)s
• B. 1.0 x 10\(^{-4}\) s
• C. 1.0 x 10\(^{4}\)s
• D. 3.0 x 10\(^{4}\)s

(a) Distinguish between the forces of adhesion and cohension

(b) Give one example each of the forces of adhesion and cohesion.

I. Total internal reflection of light.

II. Conservation of light energy.

III. Relative motion of the earth, sun and moon.

IV. Rectilinear propation of light.

Which of the above is a phenomenon of total solar eclipse?

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

he lead-acid accumulator consists of

• A. lead as the positive electrode
• B. lead acid as the negative electrode
• C. hydrochloric acid as the electrolyte
• D. tetraoxosulphate (vi) acid as the electrolyte