2018 - JAMB Physics Past Questions and Answers - page 8
71
For what values of F and θ will the forces shown in the diagram below be in equilibrium.
A
60N and 60\(^o\)
B
60N and 30\(^o\)
C
20√3 N and 60\(^o\)
D
20√3N and 30\(^o\)
72
Which of the following phenomena cannot be explained by the molecular theory of matter?
A
Conduction
B
Convection
C
Expansion
D
Radiation
73
The friction which exist between two layers of liquid in relative motion is called.
A
Capillary
B
Surface
C
Viscosity
D
Cohesion
74
A particle of mass M initially at rest splits into two. If one of the particles of mass M1 moves with velocity V1 , the second particle moves with velocity
A
\(\frac{M1V1}{M-M1}\)
B
\(\frac{M1V1}{M1-M}\)
C
\(\frac{M1V1}{M}\)
D
\(\frac{MV}{M-M1}\)
75
To keep a vehicle moving at a constant speed V requires power P from the engine. The force provided by the engine is
A
\(\frac{P}{v}\)
B
(\(\frac{1}{2}\))V
C
PV
D
\(\frac{P}{V^2}\)
76
Which of the following is the dimension of pressure
A
ML\(^{−1}\)T\(^{−2}\)
B
MLT\(^{−2}\)
C
ML\(^{2}\)T\(^{3}\)
D
ML\(^{−3}\)
77
Palm oil from a bottle flows out more easily after it has been heated because the
A
Molecules are given energy during the heating
B
Friction between oil layers is reduced
C
Oil molecules force each other out
D
Adhesion between the oil molecules and those of the bottle is increased
78
A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms\(^{-1}\). Determine the magnitude of the resulting impulse
A
20.0kgms\(^{-1}\)
B
10.0kgms\(^{-1}\)
C
5.0kgms\(^{-1}\)
D
2.5kgms\(^{-1}\)
79
The efficiency of energy conversion on the energy flow through a hydroelectric power is?
A
\(\frac{E1}{E2}\)
B
\(\frac{E3}{E2}\)
C
\(\frac{E2}{E1}\)+ E2
D
\(\frac{E2}{E3}\) + E1
80
An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is
A
25.2N
B
17.4N
C
12.6N
D
9.0N
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