2015 - JAMB Physics Past Questions and Answers - page 2
11
In which of the following device in the expansion of solid is a disadvantages?
I. Simple pendulum
II. Fire alarms
III. Thermostat
IV. Bimetallic thermometer
I. Simple pendulum
II. Fire alarms
III. Thermostat
IV. Bimetallic thermometer
A
III only
B
II & III only
C
I only
D
II, III & IV only
correct option: c
Simple pendulum does not depend on thermal expansion
Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid
Users' Answers & CommentsFive alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid
12
If an object is placed at a height of tem above the ground at a stationary point. It posses what types of energy?
A
Mechanical energy
B
Stationary energy
C
Potential energy
D
Vibrational energy
correct option: c
Energy due to position T is potential energy (P.E)
Energy due to motion is kinetic energy (K.E)
Users' Answers & CommentsEnergy due to motion is kinetic energy (K.E)
13
Calculate the gravitation force of attraction between two planets of 1024kg and 1027kg separated by a distance of 1020meters.
A
6.67N
B
6.56N
C
7.5N
D
8.6N
correct option: a
F = (Gm1m2) ÷ r2
M1 = 1024Kg, M2 = 1027Kg , r = 102
(Note: the gravitational constant of G = \(6.67 × 10^{ 7ndash; 11}\) \( Nm^2/Kg^2 \)
F = \( (6.67 × 10^{– 11 + 24 + 27)} 10^40 = 6.67 × (10^40 ÷ 10^40)
= 6.67N
f = 6.67N
Users' Answers & CommentsM1 = 1024Kg, M2 = 1027Kg , r = 102
(Note: the gravitational constant of G = \(6.67 × 10^{ 7ndash; 11}\) \( Nm^2/Kg^2 \)
F = \( (6.67 × 10^{– 11 + 24 + 27)} 10^40 = 6.67 × (10^40 ÷ 10^40)
= 6.67N
f = 6.67N
14
Mr. F. Abioye observed his image though a plane mirror, kept a distance way from him at 4.7m in his room at what distance is the image found from Abioye eye?
A
9.4m
B
7.5m
C
5.7m
D
6.9m
correct option: a
As object and image are usually at equal distance apart from the mirror /p>
Distance between Abioye (a) and hip image (I) = AI
i.e. AI = 4.7 + 47
= 9.4m
Users' Answers & CommentsDistance between Abioye (a) and hip image (I) = AI
i.e. AI = 4.7 + 47
= 9.4m
15
Primary colours of light are
A
Red, blue and green
B
Cyan, magneta and yellow
C
Black, blue and green
D
None of these colours
correct option: a
Primary colours of light are red, blue and green
Secondary colours of light are cyan, magneta and yellow
Users' Answers & CommentsSecondary colours of light are cyan, magneta and yellow
16
Electrons were discovered by
A
James Chadwick B.
B
J.J Thompson
C
Sir Isaac Newton
D
Charles Newton
17
What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage?
A
e = M.A/V.R × 100 %
B
M.A = E.V.R
C
V.R = 1 ÷ sin θ M.A
D
M.A = 1/E × 100%
correct option: a
he relationship between M.A, V.R, e and 100% can be written as
e = M.A/V.R × 100 %
i.e E/100 = M.A/V.R
= L ÷ E/x ÷ y = Ly/Ex
E/100 = Ly/Ex
Users' Answers & Commentse = M.A/V.R × 100 %
i.e E/100 = M.A/V.R
= L ÷ E/x ÷ y = Ly/Ex
E/100 = Ly/Ex
18
The external parts of an object can be measure accurately through the use of which scientific instrument?
A
Micrometer screw gauge
B
Vernier Caliper
C
Meter rule
D
None of the instrument
correct option: a
Micrometer screw gauge measure an objects accurately (mainly on the external parts of the object). It measures the external parts of objects only
Users' Answers & Comments19
Convert 45°C to kelvin
A
318K
B
250K
C
184K
D
120K
20
A member of the crew of a SPACESHIP experiences weightlessness in a space when they
A
Fall freely from the earth’s gravitational field
B
Is walking on the planet
C
In between the sun and the earth
D
Holding anything in space is negative
correct option: a
Weightlessness:– The state of being free from the effects of gravity. (zero gravity)
Users' Answers & Comments