1994 - WAEC Physics Past Questions and Answers - page 2
11
A simple magnifying glass is used to view an object. At what distance from the lens must the object be placed so that an image 5 times the size of the object is produced 20cm from the lens?
A
2cm
B
4cm
C
15cm
D
25cm
correct option: b
Users' Answers & Comments12
The inability of the eye to focus near objects is known as
A
Long sight
B
Astigmatism
C
Presbyopia
D
Glaucoma
correct option: a
Users' Answers & Comments13
Which of the following are transverse waves? I. Ripples on water II. Sound waves in air III. Light waves from the sun
A
II only
B
I and II only
C
II and III only
D
I and II only
correct option: d
Users' Answers & Comments14
Which of the following has the shortest wavelength?
A
Infrared rays
B
Gamma rays
C
Ultra violet rays
D
Radio waves
correct option: b
Users' Answers & Comments15
The electrical energy supplied by a Leclanche cell is obtained from the
A
Nuclear energy
B
Magnetic energy
C
Solar energy
D
Chemical energy
correct option: d
Users' Answers & Comments16
Which of the following is not a part of an A.C generator?
A
Carbon brushes
B
Slip rings
C
Commutator
D
Field magnet
correct option: c
Users' Answers & Comments17
Which of the following scientists postulated that moving particles exhibit wave properties?
A
Niels Bohr
B
Ernest Rutherford
C
Werner Heisenberg
D
Louis de Broglie
correct option: d
Users' Answers & Comments18
A battery of e.m.f 10V an internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d
A
8.75V
B
7.50V
C
5V
D
2.50V
19
A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
A
a moving coil ammeter
B
a D.C generator
C
a D.C electric motor
D
An induction coil
correct option: c
Users' Answers & Comments20
A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
A
180Ω
B
27Ω
C
3Ω
D
1.3Ω