2013 - JAMB Physics Past Questions and Answers - page 1
1
When a brick is taken from the earth's surface to the moon, its mass
A
remains constant
B
reduces
C
increases
D
becomes zero
correct option: a
Users' Answers & Comments2
The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle 0f 30o with the resultant, find its magnitude.
A
100.0N
B
57.7N
C
43.3N
D
25.0N
3
The pair of physical quantities that are scalar only are ?
A
volume and area
B
moment and momentum
C
length and displacement
D
Impulse and time
correct option: a
This is because volume and the area have only magnitude but no direction
Users' Answers & Comments4
A simple pendulum of length 0.4m has a period of 2s. What is the period a similar pendulum of length 0.8m at the same place?
A
8s
B
4s
C
2\(\sqrt{2}s\)
D
\(\sqrt{2}s\)
correct option: c
T2 = (\sqrt{\frac{L^2 \times T_1^2}{L_1}})
= (\sqrt{\frac{0.8 \times 2^2}{0.4}})
= 2(\sqrt{2}s)
Users' Answers & Comments5
A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2m-2. The time required to bring the train to a complete halt is?
A
5s
B
10s
C
20s
D
40s
6
Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.
[g = 10ms-2]
[g = 10ms-2]
A
686N
B
595N
C
581N
D
105N
7
A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?
[Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]
[Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]
A
0.8
B
0.5
C
0.2
D
0.1
8
An object is moving with a velocity of 5m-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?
A
25.0m
B
20.0m
C
1.3m
D
1.0m
correct option: c
P.E = K.E
Therefore, h = (\frac{v^2}{2g} = \frac{5^2}{2 \times 10})
= 1.25
Approx 1.3 (C)
Users' Answers & Comments9
If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is
A
2.2.5 x 10 5js-1
B
2.5 x 104js-1
C
3.3 x 103js-1
D
3.3 x 102js-1
correct option: c
P = (\frac{mgh}{t})
P = (\frac{5000 \times 10 \times 60}{(15 \times 60)s})
P = 3333.3333
P = 3.3 x 103js-1
Users' Answers & Comments10
The coefficient of friction between two perfectly smooth surface is
A
infinity
B
one
C
half
D
zero
correct option: d
Users' Answers & Comments