Jamb 1979

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 …

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

Jamb 1979 If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of A. 4 B. π/2 C. 1/4 D. 2π E. 2 ANSWER: Option E EXPLANATION: for simple pendulum; T = 2π√(L/g) Where; T is the Tension L …

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 …

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 …

In what range of temperature is the expansion of water anomalous

Jamb 1979 In what range of temperature is the expansion of water anomalous? A. +208°C to +212°C B. -80°C + -76°C C. -4°C to 0°C D. +96°C to +100°C E. 0°C to +4°C  ANSWER: Option E EXPLANATION: The anomalous expansion of water is an abnormal property of water whereby it expands instead of contracting when …

When the vapour of a substance is in equilibrium with its own liquid, it is said to be

Jamb 1979 When the vapour of a substance is in equilibrium with its own liquid, it is said to be A. gaseous B. unsaturated C. liquefied D. diffused E. saturated  ANSWER: Option E EXPLANATION: Saturation, any of several physical or chemical conditions defined by the existence of an equilibrium between pairs of opposing forces or …

In the given circuit of below the cell P has an e.m.f. 1.5V and an unknown internal resistance r while the cell Q has an e.m.f. 2.0V …

Jamb 1979 In the given circuit of below the cell P has an e.m.f. 1.5V and an unknown internal resistance r while the cell Q has an e.m.f. 2.0V and an internal resistance of 1ohm. If the ammeter reads 50mA, then r is equal to A. 0.5 ohm B.0.62 ohm C. 1.0 ohm D. 2.0 …

If the wavelength of a wave travelling with a velocity of 360 m/s is 60m, the period of the wave is

Jamb 1979 If the wavelength of a wave travelling with a velocity of 360 m/s is 60m, the period of the wave is A. 6s B. 3.6s C. 0.17s D. 0.61s E. 3s  ANSWER: Option C EXPLANATION: the equation to use for this question is; v = λ/T Where; v – velocity of the wave …

Which one of the following types of waves cannot travel through a vacuum

Jamb 1979 Which one of the following types of waves cannot travel through a vacuum? A. sound waves B. light waves C. infra-red waves D. X-radiation E. radio waves.  ANSWER: Option A EXPLANATION: Sound is a mechanical wave and a mechanical wave is a wave that requires a material medium to propagate. Vacuum is an …