JAMB UTME - Physics - 1984
Frage 1 Bericht
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Frage 2 Bericht
Two cells each of e.m.f. 1.5V and an internal resistance \(2\ \Omega\) are connected in parallel. Calculate the current flowing when the cells are connected to a \(1\ \Omega\) resistor
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rT = 2×22+2
= 1
e.m.f. = I(R + r)
1.5 = I(1 + 1)
I = 0.75Ω
Frage 3 Bericht
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Frage 4 Bericht
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Frage 5 Bericht
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= 1000×10×1010
= 10kW
Frage 6 Bericht
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= 650watts
Energy(kWhr) = 650 x 10-3 x 10
= 6.5 kWhr
1kWhr cost 2 kobo ; 6.5 kWhr will cost 2×6.51
= 13 kobo
Frage 7 Bericht
A short bar magnet is placed in earth's magnetic field, as shown above, which of the points II and III are/is possible positions of a neutral point?
Frage 8 Bericht
Frage 9 Bericht
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Frage 10 Bericht
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4 = F2 - 256
F2 = 260Hz
Frage 11 Bericht
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Frage 12 Bericht
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Frage 14 Bericht
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Frage 15 Bericht
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Frage 16 Bericht
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Frage 17 Bericht
Frage 19 Bericht
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Efficiency = m.AV.R x 100%
60 = 120effort x 12 x 100
Effort = 100N
Frage 20 Bericht
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Frage 21 Bericht
Which of the following i. \( \beta \)-particles ii. protons iii. neutrons iv. \( \alpha \)-particles. may be found in light nuclei?
Frage 22 Bericht
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Frage 23 Bericht
All the heat generated in a \(5\ \Omega\) resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
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mL = I2Rt
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1
Frage 24 Bericht
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3 x 108 = λ x 800 x 103
λ = 375.0m
Frage 25 Bericht
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2 x v = 1.6 x 10-2 x 150
v = 1.2ms-1 in opposite direction
Frage 26 Bericht
A body of mass 5kg initially at rest is acted upon by two mutually perpendicular forces 12N and 5N as shown in fig.3. If the particle moves in the direction QA, calculate the magnitude of the acceleration
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R = 13N and R = F = ma
13 = 5 x a
= 2.60ms-2
Frage 27 Bericht
In the circuit Shown above, calculate the effective capacitance between X and Y
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Frage 28 Bericht
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mcθ = power x time
5 x 1 x 10-2 x C = 100 x 20
C = 4.0 x 104Jkg-1k-1
Frage 30 Bericht
A force varying linearly with the distance acts on a body as shown above, The work done on the body by the force during the first 10m of motion is
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Frage 31 Bericht
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Frage 33 Bericht
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Frage 34 Bericht
A given mass of an ideal gas occupies a volume V at a temperature T and under a pressure p. If the pressure is increased to 2p and the temperature reduced to \( \frac{1}{2T} \), then the percentage change in the volume of the gas is
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P2 = 2P1
T1 = 2T2
2P1V2T2 = P1V12T1
V2 --V1
% change = V1−14V1V1 X 100%
= 75%
Frage 36 Bericht
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Frage 38 Bericht
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49mm .... θ
0mm .... 0oC
49−0210−0 = θ−0100−0
49210 = θ100
θ = 23.3oC
Frage 39 Bericht
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= m x a x d
= kg x ms2 x m1
= ML2T2
Frage 40 Bericht
Frage 41 Bericht
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= 0.880.02 = 44 rad/s
2π F = W = 44
F = 442×3.142
= 7Hz
Frage 42 Bericht
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Frage 44 Bericht
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4.2 x 7.2 x 102 = v x 8.4 x 102
= 3.6m3
Frage 45 Bericht
A coin is placed at the bottom of a cube of glass tern thick. If the refractive index of the glass is \( \mu \), how high does the coin appear to be raised to an observer looking perpendicularly into the glass?
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μ = tx ⇒ X = tu
raised of coin = t - x
= t - tμ
= t(μ−I)μ
