1999
The voltage and current in the primary of a transformer are 200V and 2Arespectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency.
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1999 WAEC SSCE Physics Past Questions
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1999
Magnetic flux density is defined as the
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1999
A resistance wire of length 2 m and of uniform cross-sectional area 5.0 x 10-7 m2 has a resistance of 2.2 Ω Calculate its resistivity
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1999
A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm-1 Calculate the work done on the charge
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1999
Which of the following are the essential parts of an atomic bomb?
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1999
The half-life of a radioactive element is 5 Calculate its decay constant
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1999
The half-life of a radioactive substance is
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1999
A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10-34Js; 1eV = 1.6 x 10-19J)
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1999
Which of the following is not a safety precaution in a nuclear station?
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1999
In the actual exam, a setup will be provided that includes connecting a circuit with an accumulator, a resistance box, a rheostat, an ammeter, and an additional resistor Q. The circuit is arranged as shown in the diagram…
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1999
In the actual exam, a setup will be provided that includes a glass block on a sheet of paper, tracing the outline of the block, and performing a refraction experiment. The experiment involves drawing incident rays at var…
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1999
In the actual exam, a setup will be provided involving a thread AC fixed at a pulley A, passing over a pulley C on a force board, carrying an unknown mass m₀. A line is drawn along the direction of AC on paper behind the…
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1999
(a) Explain: (i) Fusion. (ii) Fission.(b) State three advantages of fusion over fission in the generation of power(c) Calculate in joules, the binding energy for\(\frac{59}{27}\) Co(Atomic mass of \(^{59}_{2} Co\) = 58.9…
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1999
(a) Sketch the magnetic flux pattern around a long; straight, current-carrying wire(b) State two methods by which the sensitivity of a moving-coil galvanometer can be increased.(c) A series RLC circuit comprises a 100-\(…
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1999
(a) State three properties of waves(b)(i) Describe, with the aid of a labelled diagram, an experiment to show how the frequency of the note emitted by a vibrating string depends on the tension in the string(ii) State two…
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1999
(a) Explain (i) work: (ii) power (b) Show that the efficiency E, the force ratio M.A. and the velocity ratio V.R. of a machine are related by the equation: E = M.A. x 100% V.R. (c) An inclined plane of angle 15° is use…
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1999
(a) State the conditions for the equilibrium of a rigid body acted upon by parallel forces(b)(i) Describe an experiment, using the principle of moments, to determine the mass of a metre rule(ii) State two precautions nec…
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1999
(a) State Heisenberg's uncertainty principle.(b) Mention two phenomena that can only be explained in terms of the particulate nature of light.
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1999
(a) Explain electrolysis(b) Classify the following substances as electrolytes and non-electrolytes: Sugar solution, paraffin, salt solution and grapefruit juice.
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1999
(a) State Hooke's law of elasticity(b) A spiral spring, loaded with a piece of metal, extends by 10.5cm hair. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the…
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