2006 - JAMB Physics Past Questions and Answers - page 4
31
I. The number of neutrons released exceeds the number that caused the fission.
II. There is loss of mass.
III. Energy is produced.
IV. Smaller nuclei merge to form larger nuclei
which of the statement above are correct about nuclear fission?
A
II,III and IV only
B
I, II and IV only
C
I,II and III only
D
I, III and IV only
32
A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?
A
boron and antimony
B
boron and antimony
C
aluminium and indium
D
arsenic and antimony
33
A p-n junction diode is used as?
A
a rectifier in a d.c circuit
B
an amplifier in d.c circuit
C
an anplifier in an a.c circuit
D
a rectifier in an a.c circuit
34
An object placed 10cm from a concave mirror of focal length 5cm would have its image
A
at the centre of convature
B
at the radius of curvature
C
at infinity
D
10 cm from the focus
35
A submarine is observed to rise from a real depth off 80 m to 60 m in water. calculate the change in apparent depth.
[Refraction index of water (4)/3]
A
45 m
B
80 m
C
15 m
D
60 m
36
Non-luminous object can be seen because they
A
reflect light
B
are near
C
are polished
D
emit light
37
The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?
A
33 cm
B
44 cm
C
22 cm
D
17 cm
38
A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?
A
37.50 cm
B
75.00 cm
C
18.75
D
25.00 cm
39
If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600 µC across the field is?
A
0.8 J
B
1.8 J
C
9.0 J
D
18.0 J
40
A conductor has a diameter of 1.00 mm and length 2.00m. if the resistance of the material is 0.1Ω, its resistivity is?
A
2.55 x 105 Ωm
B
2.55 x 102 Ωm
C
3.93 x 10-6 Ωm
D
3.93 x 10-8 Ωm
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