Physics Past Questions

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146 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10
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Past Questions

146 questions
Question 1 of 20 146 total questions
Question 51
jamb 2000

The correct position for a fuse in the diagram above is

Abetween P and Q
BQ
CS
DP
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Question 52
jamb 2000

In the diagram above, the values of V1 and V2 are respectively

A1V and 1/3V
B1/3V and 1V
C1/3V and 2/3V
D1V and 2/3V
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Question 53
jamb 2000

In the diagram above a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b and c respectively represents?

Ared, green and blue
BGreen, red and blue
CYellow , blue and red
DBlue , yellow and red
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Question 54
jamb 2000

The diagram above shows two capacitors P and Q of capacitance 5μF and 10μF. Find the charges stored in P and Q respectively

A2μC and 4μC
B4μC and 2μC
C100μC and 200μC
D200μC and 100μC
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Question 55
jamb 2000

The diagram above shows a maximum and minimum thermometer divided into three portions P, Q and R. Which of the following is true about the respective content of P,Q and R

AAlcohol, mercury and alcohol
BAir, alcohol and mercury
CMercury, alcohol and mercury
DAir, mercury and alcohol
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Question 56
jamb 2000
An engineer intends to deviate a light ray from its path by 120o through reflection from a plane mirror. Calculate the angle of incidence
A60o
B40o
C30o
D20o
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Question 57
jamb 2000

A transverse wave is applied to a string whose mass per unit length is 3 x 10-2kgm-1. If the string is under a tension 12N, the speed of the propagation of the wave is

A5 ms-1
B20 ms-1
C30 ms-1
D40 ms-1
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Question 58
jamb 2000
A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is
Ay = 0.15 sin 200π(x - 5.5t)
By = 0.15 sin π(0.01x - 5.5t)
Cy = 0.15 sin 5.5π(x - 200t)
Dy = 0.15 sin π(550x - 0.01t)
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Question 59
jamb 2000

A sonometer wire is vibrating at frequency fo. If the tension in the wire is doubled while the length and the mass per unit length are kept constant, the new frequency of vibration is

Afo/2
B2fo
Cfo/√2
Dfo√2
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Question 60
jamb 2000
A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum
A4.0 m
B3.0 m
C2.0 m
D1.5 m
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Question 61
jamb 2000

The velocity y of a particle in a time t is given by the equation
y = 10 + 2t\(^2\)
Find the instantaneous acceleration after 5 seconds

A60 ms-2
B20 ms-2
C15 ms-2
D10 ms-2
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Question 62
jamb 2000

Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is

A1.7V
B2.0V
C8.0V
D15.0V
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Question 63
jamb 2000
A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is
A0.2N
B0.8N
C3.2N
D8.0N
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Question 64
jamb 2000
A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is
A25%
B33%
C50%
D75%
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Question 65
jamb 2000
A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is
A200 Ω
B50 Ω
C100/π Ω
D25/π Ω
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Question 66
jamb 2000

A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are

Abeta rays
Bgamma rays
Cx-rays
Dultra-violet rays
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Question 67
jamb 2000
If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?
A24 years
B20 years
C10 years
D2 years
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Question 68
jamb 2000

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?
[e = 1.6 x 10\(^{19}\)C, h = 6.63 x 10\(^{-34}\)Js]

A6630.0V
B663.0V
C66.3V
D6.6V
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Question 69
jamb 2000
An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is
A80.0W
B40.0W
C10.0W
D0.1W
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Question 70
jamb 2000
A gas would serve as an electrical conductor under
Areduced pressure and high current
Bincreased magnetic field
Creduced pressure and reduced potential
Dexposure to visible light
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