JAMB UTME - Physics - 2011
Question 1 Report
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(1)/r = (1)/v + (1)/u = (1)/-50 + (1)/25 = (1 + 2)/50 = (1)/50 f = +50cm = +0.5m
p = (1)/r = (1)/0.5 = (10)/5 = 2 diopters
The power of a lens is the reciprocal of the focal length in meters. it is expressed in diopters.
Question 2 Report
Question 3 Report
[g = 10 ms2]
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Question 4 Report
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3 kwh = 3 x N4 = N 12
Question 5 Report
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Mg - mg = 0
The man feels weightless because the reaction, R is equal to the weight mg
Question 6 Report
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Electric potential is work done in taking a unit mass or charge from infinity to that point
| V = | w | = | Fr | = | Q1Q2 | x | r |
| Q | Q | 4πεor2 | Q1 |
| = | _q |
| 4πεor |
Question 7 Report
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Question 8 Report
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Question 9 Report
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v = -3u
f = 15cm
1/v + 1/U = 1/f1/-3U + 1/u = 1/152/3u = 1/15
3U = 15 x 2
U = 30/3
= 10 cm
Question 10 Report
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while the energy required to raise the temperature of a unit mass of water from 0°c to 100°c = C x Dt = 4200 x 100 = 420000 = 4.2 x 105 JKg-1
? steam possesses greater heat energy per unit mass
Question 11 Report
The diagram above shows two vectors at right angles to each other. The value of the resultant vector is
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= 62 + 82 = 36 + 64 = 100
R = √100 = 10.0N
Question 12 Report
A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?
[g = 10 ms-2]
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= P e at the maximum height (conservation of mechanical energy)
K e = P e = mgh = 1.5 x 10 x 20
= 300 J
Question 13 Report
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Question 14 Report
[H = 6.6 x 10-34 Js]
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= 8.58 x 10-19
Question 15 Report
Question 16 Report
[young modules = 1.1 x 1011 Nm-2]
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= 1.1×1011=7.7×107Tensile Strain
∴ Tensile strain = 7.7×1071.1×1011
= 7.0×107−11=7.0×10−4
Question 17 Report
In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is
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| I | V |
| R |
| = | 12 |
| 12 |
= 1A
Question 18 Report
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f2 = ? T2 = 324N
But f ∝ √T => f = K√T
=> K = f/√T
∴ f1/√T1 = f2/√T2225/√225 = f2/√324
| f2 = | 225√225 |
| √225 |
| = | 225 x 18 |
| __15 |
= 306Hz
Question 19 Report
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Question 20 Report
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Question 21 Report
A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]
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330 = (2 x 4.95 x 103)/t
t = (9.9. x 103/330 = (9900)/330 = (90)/3
= 30 secs
Question 22 Report
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Question 23 Report
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Question 24 Report
Question 25 Report
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Question 26 Report
I. High thermal capacity.
II. High sensitivity.
III.Easy readability.
IV. Accuracy over a wide range of temperature
From the statement above, the qualities of a good thermometer are
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? II, III and IV are qualities of a good thermometer
Question 27 Report
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Question 28 Report
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Question 29 Report
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∴ metals Y will form the anode which is deposited at the cathode made of x
Question 30 Report
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= 40 = 20×10x×1001
= 500J
Question 31 Report
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(1)/r = (1)/r1 + (1)/r2 + (1)/r3 = (1)/2 + (1)/2 + (1)/2 = (3)/2
∴ r = (2)/3 = 0.67Ω
Question 32 Report
Question 33 Report
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Question 34 Report
Question 35 Report
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Question 36 Report
The diagram above show the positions of a cone. The position which can be described as neutral equilibrium is represented as
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Question 37 Report
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= 3 x 2.0 X 10-5 x 40 x (90 - 30)
= 6 x 10-5 x 40 x 60
0.144 cm3
∴ No correct option
Question 38 Report
If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys
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Question 39 Report
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Question 40 Report
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0 = 1002 - 2 x 10 x s = 10000 - 20s
s = (10000)/20 = 500m
Which is independent of mass.the two bodies where acted upon by the same retarding force of gravity which is independent of mass of the body; therefore both will be 500 m from the point of throw.
Question 41 Report
Question 42 Report
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(1)/L = (1)/4 + (1)/8 = (3)/8
∴ L = (8)/3
Energy stored = (1)/2 LI2
= (1)/2 x (8)/3 x 10 x 10 = (400)/3 = 133.3 J
Question 43 Report
In homes, electrical appliances and lamps are connected in parallel because
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The voltage of a circuit is the same whether in parallel or in series. Parallel and series affects resistance and current. So the answer should be it uses less current.
Question 44 Report
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P x t = C ∆ Ø
(25 x 5 x 60)/300 = 750 JK-1
Question 45 Report
I. Density of the liquid.
II. Depth below the surface of the liquid.
III. Surface area of the liquid.
In which of the statement above will pressure be dependent?
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∴ the correct options are I & II
Question 46 Report
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| Irms = | I0 |
| ?2 | |
| Therefore | ?2Irms | = | I0 |
| Irms | = | 1 | |
| I0 | ?2 |
Question 47 Report
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Question 48 Report
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Question 49 Report
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= 0.693 x 105
= 6.93 x 104 sec
Question 50 Report
I. change of state
II. Diffusion
III. Radiation
IV. Osmosis
Which of the processes above can be explained using the kinetic theory?
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