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 …
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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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 …
Jamb 1978 The net charge on the atom is zero because A. the electrons and the protons that are charged are in the nucleus B. the total charge on the electrons is equal to the total charge on the neutrons C. the neutrons form a shield around the charged protons. D. the number of electrons …
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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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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Jamb 1978 A string is sustaining a stationary wave when A. the frequency of the wave is hot proportional to the wavelength of the wave B. the amplitude of vibration is always zero C. two equal waves are travelling in opposite directions D. the waves are longitudinal E. the frequency is directly proportional to the …
Jamb 1978 The angular dispersion of a prism depends on A. the index of refraction only B. the angle of incidence as well as the index of refraction C. the angle of incidence only D. the thickness of the prism E. the prism angle. ANSWER: Option A EXPLANATION: If you have a good explanation for …
Jamb 1978 Which of the following is true for the image formed by a convex mirror? 1. The image is always virtual II. The image is always erect II. The image lies between pole and focus IV. The image is never magnified V. The focal length is negative A. I only B. I and II …
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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. …
