JAMB UTME - Physics - 1993
Swali 1 Ripoti
In the network shown above, determine the potential difference across the 5µF capacitor
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A parallel plate capacitor of area \(10\text{cm}^2\) in vacuum has a capacitance of \(10^{-2}\,\mu\text{F}\). What is the distance between the plates? \((e = 9 x 10^{-12}\text{fm})\)
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10-2 x 10-6 = 9×10−12d x 10-4
= 9 x 10-7m
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Swali 7 Ripoti
A plane inclined at angle \( \theta \) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by
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Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2
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Swali 10 Ripoti
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200 x c x (90 - θ )
θ = 70oC
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distance = velocity x time
= 3 x 108 x 4 x 10-3
= 6 x 105m
Swali 14 Ripoti
In the figure above,A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms-2]
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= 12 x 601
= 30cm
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Swali 18 Ripoti
The diagram above shows a velocity time graph representing the motion of a car. Find the total distance covered during the acceleration and retardation of the motion
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Swali 19 Ripoti
A 40-W instrument has a resistance of \(90\ \Omega\). On what voltage should it be operated normally?
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Swali 20 Ripoti
A metal rod 800mm long is heated from 10oC to 95oC. If it expands by 1.36mm, the linear expansivity of the metal is
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Swali 22 Ripoti
A beam of light is incident from air to water at an angle of \(30^\circ\text{C}\). Find the angle of refraction if the refractive index of water is \(\frac{4}{3}\)
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r = 22oC
Swali 23 Ripoti
If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is
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= 0.00067m3
volume of paraffin displaced = 12 x 0.00067
= 0.00034m3
mass of paraffin = 900 x 34 x 10-5
= 0.3kg
weight of paraffin = 0.3 x 10
= 3N = upthrust = tension in the string
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error thickness = 30 - 20 = 10
error = 12 - 10 = 2mm that is, (11 ± 1)mm
%error = 111 x 1001
= 9%
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Swali 39 Ripoti
Two forces of magnitudes 7N and 3N act at right angles to each other. The angle \( \theta \) between the resultant and the 7N force is given by
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