2009 - JAMB Physics Past Questions and Answers - page 1
1
The ability of the human eye to focus object on the retina is referred to as the power of
A
interference
B
diffraction
C
accomodation
D
superposition
2
Which of the following is a secondary colour
A
blue
B
orange
C
red
D
green
3
If negative charges are induced on an electroscope and a positively charged rod is brought near the cap of the electroscope, the leaves will
A
close up
B
become positively charged
C
become negatively charged
D
open further
4
An electric lamp marked 240v, 60 W is left to operate for an hour. How much energy is generated by the filament?
A
3.86 x 105J
B
3.56 x 105J
C
1.80 x 104J
D
2.16 x 105J
5
A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which charges from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f.
A
5.60 v
B
24.00 v
C
0.24 v
D
2.40 v
6
Cancerous cells can be destroyed by
A
ultraviolet rays
B
alpha particules
C
x - rays
D
infrared rays
7
If the decay constant of a radioactive substance is 0.231s1, the half-life is?
A
3.00 s
B
0.12 s
C
0.33 s
D
1.50 s
8
A piece of radioactive material contains 1020 atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is
If the half life of the material is 20 seconds, the number of disintegration in the first second is
A
3.47 x 1018
B
6.93 x 10 20
C
3.47 x 1020
D
6.93 x 1018
9
Thermionic emission is the process whereby
A
β - rays are produced
B
holes are produced
C
x - rays are produced
D
electrons leave a hot element
10
Which of the following can conduct electricity owing to the presence of free mobile electrons?
A
germanium
B
silicon
C
grapefruit
D
copper
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