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Physics WAEC / WASSCE 1992 Magnetism, Electromagnetism & AC Circuits
The diagram above shows the magnetic field around a bar magnet which has its N-pole pointing north. The neutral points in the field are likely to occur at
Attached Figure / Diagram
Question diagram
A
1 and 2
B
3 and 4
C
5 and 6
D
7 and 8
E
9 and 10
medium Difficulty
Physics WAEC / WASSCE 1992 Electrostatics & Capacitors
A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct?
A
The cap will be positively charged and the negatively charged leaves will diverge
B
The cap will be negatively charged and the positively charged leaves will diverge
C
The cap and the leaves will be positively charged
D
The cap and the leaves will be negatively charged.
E
The leaves will not diverge because the cap has been earthed.
medium Difficulty
Physics WAEC / WASSCE 1992 Current Electricity & Electric Circuits
Calculate the rate at which energy is used up in the circuit illustrated by the diagram
Attached Figure / Diagram
Question diagram
A
0 W
B
2 W
C
4 W
D
8 W
E
16 W
medium Difficulty
Physics WAEC / WASSCE 1992 Current Electricity & Electric Circuits
Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?
A
Polarization
B
Local action
C
Formation of hydrogen electrode
D
Increase in the resistance of the cell
E
Generation of less current by the cell
medium Difficulty
Physics WAEC / WASSCE 1992 Current Electricity & Electric Circuits
Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2 and resistivity 1.1 x 10-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]
A
0.42m
B
2.40 m
C
6.25 m
D
183.75 m
E
590.00 m
medium Difficulty
Physics WAEC / WASSCE 1992 Atomic, Quantum, Nuclear Physics & Electronics
A stream of alpha particles is projected into an electric field between two plates X and Y as shown in the diagram above. Which of the following is correct? The particles are
Attached Figure / Diagram
Question diagram
A
accelerated and they continue in a straight line
B
directionally reversed at the end of the plates
C
deflected towards plate Y
D
attracted by both plates
E
deflected towards plate X.
medium Difficulty
Physics WAEC / WASSCE 1992 Atomic, Quantum, Nuclear Physics & Electronics
An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years
A
1 N atoms8
B
1 N atoms3
C
2 N atoms3
D
5 N atoms6
E
7 N atoms8
medium Difficulty
Physics WAEC / WASSCE 1992 Work, Energy, Power & Simple Machines
When the nucleus of a uranium atom is split into two fragments of nearly equal mass the sum of the masses of the fragments is less than the mass of the original nucleus. This difference is a measure of the
A
experimental error in calculating the separate masses
B
change of momentum of each fragment
C
potential energy lost
D
nuclear energy released
E
kinetic energy lost
medium Difficulty
Physics WAEC / WASSCE 1992 Atomic, Quantum, Nuclear Physics & Electronics
A sheet of paper is placed in the path of a beam of radiations from a radioactive source. Which of the following radiations will pass through the paper?I. Alpha rays II. Beta rays III. Gamma rays
A
I only
B
II only
C
III only
D
II and III only
E
I, II and III
medium Difficulty
Physics WAEC / WASSCE 1992 Atomic, Quantum, Nuclear Physics & Electronics
The process by which a metal, heated to high temperature, gives off electrons from its surface is known as
A
photoelectric emission
B
thermionic emission
C
radioactive emission
D
Held emission
E
secondary emission
medium Difficulty
Physics WAEC / WASSCE 1992 Elasticity, Density, Pressure & Fluids
An electric string of length l is elastically stretched through a length e by a force F. The area of cross- section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?
A
F = EA/eI
B
F = EAI/e
C
F = EAe/l
D
F = EAe
medium Difficulty
Physics WAEC / WASSCE 1992 Atomic, Quantum, Nuclear Physics & Electronics
(a) Explain what is meant by photoelectric emission (b) Draw a labelled diagram showing the structure of a simple type of a photocell and explain its mode of operation. (c) State four applications of photoelectric emission. (d) In a photocell, no electrons are emitted until the threshold frequency of light is reached. Explain what happens to the energy of the light before emission of electrons begins. State one factor that may affect the number of emitted electrons.
A
F = EA/eI
B
F = EAI/e
C
F = EAe/l
D
F = EAe
E
secondary emission
medium Difficulty
Physics UTME / JAMB 1992 Magnetism, Electromagnetism & AC Circuits
PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move
A
Upwards
B
Downwards
C
TOwards The North Pole
D
Towards The South Pole
medium Difficulty
Physics UTME / JAMB 1992 Current Electricity & Electric Circuits
What is the least possible error in using a rule graduated in centimeters?
A
0.1cm
B
0.5cm
C
1.0cm
D
2.0cm
medium Difficulty
Physics UTME / JAMB 1992 Circular Motion, Gravitation & Simple Harmonic Motion
Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.
A
i, ii, and iii
B
ii and iii only
C
i and iii only
D
i and ii only
medium Difficulty
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