1993 WAEC SSCE Physics Past Questions

1993

Calculate the current, I in the diagram shown above.(Neglect the internal resistance of the cell)

1993

Electrical resistance is the property of an electrical conductor that causes electrical energy to be converted into

1993

The function of the magnanese (IV) oxide in a leclanche cell is to

1993

How long does it take a 750 W heater operating at full rating to raise the temperature of 1 kg of water from 40oC to 70oC? (Take the specific heat capacity of water as 4200 J kg-1 K-1 and neglect heat losses).

1993

What amount of current would pass through a 10 Ω coil if it takes 21s for the coil to just melt a lump of ice of mass 10g at 0oC if there are no heat losses? (Latent heat of fusion of ice = 336 Jg-1).

1993

When a potential difference, V is applied across the ends of a resistor of resistance, R a Current, l passes through the resistor. The heat generated in the resistor in time, t is given by the expression

1993

ln the diagram below, the galvanometer indicates a null-deflection. What is the potential difference between P and Q?

1993

The phenomenon of radioactivity was first discovered by

1993

lf Einstein’s photoelectric equation is represented by hf - W = Φ where h is Planck’s constant, f the frequency of incident radiation and W the work function of the material, what does the symbol Φ up stand for?

1993

When an atom is in the ground state, it is said to be

1993

Eight or - particles and size B - particles are emitted from an atom of 92238U before it achieves stability. What is the nucleon number of the final product in the chain reaction?

1993

Which of the following is not a product of nuclear fission?

1993

Which of the following are emitted from a radioactive substance without altering either the nucleon number or the proton number of the substance?

1993

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

1993

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

1993

(a) Explain the following, illustrating your answer with one example in each case: (i) nuclear fusion: (ii) nuclear fission: (iii) radiation hazards.(b) State two advantages of fusion over fission and explain briefly why…

1993

(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.

1993

(a) With the aid of a labelled diagram, describe an experiment to illustrate the relationship between the volume and the temperature of a given mass of air at constant pressure.(b) A uniform capillary tube of negligible…

1993

(a)(i) Explain what is meant by a machine (ii) Define the terms: mechanical advantage, velocity ratio and efficiency as applied to a machine. Derive the equation connecting the three terms.(b) Explain why the efficiency…

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