Physics Past Questions

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

46 questions
Question 1 of 20 46 total questions
Question 1
jamb 1998

In the AC circuit diagram above, the resonance frequency is

A5000π Hz
B2500π Hz
C5000/π Hz
D2500/π Hz
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Question 2
jamb 1998

The total resistance measured at PQ in the diagram above is

A18.0Ω
B11.0Ω
C4.0Ω
D2.0Ω
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Question 3
jamb 1998

A body on the ground is acted on by a force of 10N at a point P as shown in the fig above. What force is needed to stop the body from moving eastwards?

A5N in the direction of east
B5N in the diretion of west
C5V3N in the direction of west
D10N in the southwest direction
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Question 4
jamb 1998
In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is
Agreater than the work function
Bless than the work function
Cequal to the work function
Dequal to the maximium kinetic energy of the electron
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Question 5
jamb 1998
In a nuclear fusion experiment, the loss of mass amounts to 1.0 x 10-6kg. The amount of energy obtained from the fusion is
A3.0 x 10-4J
B3.0 x 10-1J
C9.0 x 104J
D9.0 x 1010J
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Question 6
jamb 1998
The electrochemical equivalent of a metal is 1.3 x 10-7kgC-1. The mass of the metal which 2.0 x 104C of electricity will deposit from a suitable electrolyte is
A6.5 x 10-2kg
B2.6 x 10-2kg
C6.5 x 10-3kg
D2.6 x 10-3kg
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Question 7
jamb 1998
A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.
A0.625A
B1.600A
C2.500A
D6.250A
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Question 8
jamb 1998
Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is
A3.6 x 103J
B5.0 x 103J
C3.0 x 105J
D1.8 x 107J
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Question 9
jamb 1998
The iron core of an induction coil is made from bundles of wire so as to
Aminimize eddy-currents
Bgenerate eddy-current
Cprevent sparking at the contact breaker
Dget the greatest posible secondary voltage
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Question 10
jamb 1998

A parallel plate capacitor has a common plate area of 5 x 10\(^{-8}\)m2 and plate separation of 2 x 10\(^{-3}\)m, Assuming free space,

What is the capacitance? [\(\varepsilon\)o = 9.0 X 10-\(^{-12}\)C2N-1m-2]

A2.25 x 10-17F
B4.50 x 10-17F
C2.25 x 10-16F
D4.50 x 10-16F
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Question 11
jamb 1998
Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts
A50J
B100J
C200J
D400J
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Question 12
jamb 1998
Which of the following can be used to reduce local action in a Laclanche cell?
AA carbon rod as the positive pole
BPure zinc as the negative pole
CPotassium permanganate solution in contact with the positive pole
Dcommon salt solution
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Question 13
jamb 1998
An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because
Aebonite has a negative charge while glass has a positive charge
Bebonite has a positive charge while glass has a negative charge
Cboth have negative charges
Dboth have positive charges
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Question 14
jamb 1998

The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02m apart is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]

A1.8 x 10-10N
B9.0 x 10-8N
C9.0 x 102N
D4.5 x 103N
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Question 15
jamb 1998
Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave
Ai, ii, iii and iv
Bi, ii, iv only
Ci, iii, iv only
Dii, iii, iv only
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Question 16
jamb 1998

A man wears convex lens glasses of focal length 30cm in order to correct his eye defect. instead of the optimum 25cm, his least distance of distinct vision is

A14cm
B28cm
C75cm
D150cm
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Question 17
jamb 1998
The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is
At – n
Bt (1 + 1/n)
Ct (1-1/n)
Dt (1/n - 1)
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Question 18
jamb 1998

The most suitable type of mirror used for the construction of the search light is the?

Aconcave mirror
Bconvex mirror
Cspherical mirror
Dparabolic mirror
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Question 19
jamb 1998
An object is placed in front of two plane mirrors inclined at an angle of 0o. If the total number of images formed is 7, Find the value of \(\theta\)
A30o
B45o
C51o
D90o
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Question 20
jamb 1998

An object 0 lies at a distance m in front of concave mirror of focal length f. If m < f, then the final image obtained will be

Avirtual and diminished
Bmagnified and erect
Creal and inverted
Ddiminished and erect
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