Physics Past Questions

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

103 questions
Question 1 of 20 103 total questions
Question 31
jamb 1995

The acceleration of the system show above is

A2ms-2
B4ms-2
C6ms-2
D8ms-2
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Question 32
jamb 1995

The value of T in the figure above is

A10.0N
B11.8N
C20.0N
D40.0N
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Question 33
jamb 1995

In the above fig, PQ and R are vectors, which of the following options, gives a correct relationship between the vectors?

AP = Q + R
BP = Q - R
CP = R - Q
DP + Q + R = O
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Question 34
jamb 1995
An alternating source is connected in series to a capacitor of capacity reactance \( 10^3 \sqrt{3} \) and a resistor of resistance 103 Ohms. The Impedance of the circuit is...
A\( 2000 \sqrt{3} \) Ohms
B2000 Ohms
C\( 1000 \sqrt{3} \) Ohms
D1000 Ohms
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Question 35
jamb 1995
The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days?
A\( \frac{1}{16} \)
B\( \frac{1}{4} \)
C\( \frac{1}{2} \)
D\( \frac{15}{16} \)
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Question 36
jamb 1995
A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is
A0.4eV
B2.5eV
C3.0eV
D7.0eV
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Question 37
jamb 1995
The primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of e.m.f. of 12V is applied to the primary, the secondary e.m.f. will be
A3V
B6V
C24V
D48V
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Question 38
jamb 1995
Which of the following is required to convert a milliammeter to an ammeter?
AA high resistance in parallel
BA high resistance in series
CA low resistance in parallel
DA low resistance in series
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Question 39
jamb 1995
If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
A5.00W
B4.00W
C2.00W
D25W
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Question 40
jamb 1995
An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced
A0.5kJ
B8.0kJ
C20.0kJ
D40.0kJ
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Question 41
jamb 1995

The purpose of a dielectric material in a parallel plate capacitor is to

Aincrease its capacitance
Bdecrease its capacitance
Cinsulate the plate from each other
Dincrease the magnetic field between the plates
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Question 42
jamb 1995
A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is
A16.0A
B8.0A
C0.8A
D0.4A
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Question 43
jamb 1995
If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is
A1 : 6
B1 : 3
C2 : 1
D6 : 1
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Question 44
jamb 1995

At different locations on the earth's surface, the earth's magnetic field is

Athe same in magnitude and direction
Bthe same in magnitude but different in direction
Cdifferent in both magnitude and direction
Ddifferent in magnitude but different in direction
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Question 45
jamb 1995
Two parallel plates at a distance of 8.0 x 10-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?
A4.8 Vm-1
B75.0Vm-1
C4800.0Vm-1
D75000.0Vm-1
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Question 46
jamb 1995

Which of the following pairs of colours gives the widest separation in the spectrum of white light?

ARed and Violet
BGreen and Yellow
CRed and Indigo
DYellow and Violet
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Question 47
jamb 1995

A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is

Aconvex and u =2f
Bconcave and u = 2f
Cconvex and u = f
Dconcave and u = f
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Question 48
jamb 1995
What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?
A21o
B22o
C23o
D24o
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Question 49
jamb 1995
Total eclipse of the sun occurs when the
Aearth is between the moon and the sun
Bsun is between the moon and the earth
Cmoon is between the sun and the earth
Dozone layer is threatened
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Question 50
jamb 1995

The pitch of an acoustic device can be increased by

Aincreasing the frequency
Bincreasing the amplitude
Cdecreasing the loudness
Ddecreasing the intensity
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