Which of the following devices is associated with alternating currents only?

• A. Step-up transformer
• B. Induction coil
• C. Moving coil galvanometer
• D. Lead-acid accumulator

I. for current amplification.II. for voltage stabilization. III. for power amplification.IV. as a switch.which of the above are the uses of transistor?

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

State three properties of cathode rays which suggest the particle nature of matter

The graphite rods surrounding the uranium fuel rods in a nuclear reactor, are used to

• A. absorb the neutrons and hence halt the nuclear process
• B. create the neutrons and hence slow up the nuclear process
• C. slowdown the neutrons and hence slow up the nuclear process
• D. speed up the neutrons and hence speed up the nuclear process

A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10^oC. If a temperature rise of 30^oC is obtained after 10min, the heat capacity of the material is

• A. 6.0 x 104JoC-1
• B. 4.0 x 104JoC-1
• C. 1.2 x 104JoC-1
• D. 8.0 x 104JoC-1

An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is

• A. 7.2kg
• B. 33.2kg
• C. 43.2kg
• D. 53.2kg

When an object is placed very close to the pole of a concave mirror, the virtual image obtained is

• A. diminished and upright
• B. diminished and inverted
• C. enlarged and inverted
• D. enlarged and upright

(a) Explain the terms: (i) inertia; (ii) inertial mass.

(b) List three factors which affect the rate of evaporation of water in a pond.

(c) Two ice cubes pressed together for some time were found to stick together when the pressure was removed. Explain this observation.

(d) Two vertical capillary tubes of the same diameter are lowered into beakers situated at the same level, containing liquids A and B of densities 9.2 x 10\(^2\) kgm\(^{-3}\) and 1.30 x 10\(^3\) kgm\(^{-3}\) respectively. A suction pump is used to withdraw air from the top of the liquid columns in the tubes by means of a T-piece arrangement until the liquid in A rises to a height of 26.0 cm. Calculate the height of the liquid in tube B.

Light of frequency 6.0 x 10¹⁴ Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass

• A. 4.0 x 10¹⁴Hz
• B. 6.0 x 10¹⁴Hz
• C. 7.5 x 10¹⁴Hz
• D. 9.0 x 10¹⁴Hz

Using the force displacement diagram shown below. Calculate the work done

• A. 2000J
• B. 1000J
• C. 20J
• D. 5J