Jamb PQ

A 500kg car which was initially at rest travelled with an acceleration of 5m/s², its kinetic energy after 4 seconds was

Jamb 1979 A 500kg car which was initially at rest travelled with an acceleration of 5m/s², its kinetic energy after 4 seconds was A. 10⁵J B. 2.5 x 10³J, C. 2 x 10³J D. 5 x 10³J E. 5 x 10⁵J  ANSWER: Option A EXPLANATION:  KE = ½mv² Since v = u + at KE …

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Which of the following statements defines correctly the efficiency of a machine

Jamb 1979 Which of the following statements defines correctly the efficiency of a machine? A. The load carried by the machine divided by effort required in carrying the load B. The distance moved by the load divided by the distance moved by the effort C. The useful work done by the machine divided by the …

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The density of 400cm³ of palm oil was 0.9 g/cm³ before frying. If the density of the oil was 0.6 g/cm³ …..

Jamb 1979 The density of 400cm³ of palm oil was 0.9 g/cm³ before frying. If the density of the oil was 0.6 g/cm³ after frying, assuming no loss of oil due to spilling, its new volume was A. 360cm³ B. 600cm³ C. 240cm³ D. 800cm³ E. 450cm³ ANSWER: Option B EXPLANATION: since Density = mass/volume …

The density of 400cm³ of palm oil was 0.9 g/cm³ before frying. If the density of the oil was 0.6 g/cm³ ….. Read More »

Of the following which is different from the others

Jamb 1978 Of the following which is different from the others? A. x-rays B. gamma-rays C. cathode rays D. ultra violet rays E. infrared rays  ANSWER: Option C EXPLANATION:  The Electromagnetic spectrum EM spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. They are: radio waves, microwaves, …

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For the correction of myopic defects in the human eye we require

Jamb 1978 For the correction of myopic defects in the human eye we require A. a convex lens B. a concave lens C. a combination of concave and convex lenses D. a prism E. a concave mirror.  ANSWER: Option B EXPLANATION:  Correction of nearsightedness requires a diverging lens that compensates for the overconvergence by the …

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An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror. The number of images formed is

Jamb 1978 An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror. The number of images formed is A. 1 B. 2 C. 3 D. 4 E. 5 ANSWER: Option C EXPLANATION: Use the equation below to find your answer No. …

An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror. The number of images formed is Read More »