Physics JAMB, WAEC, NECO AND NABTEB Official Past Questions

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?

A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?

The instantaneous value of the induced e.m.f as a function of time is ε = ε_o sin ωt where ε_o is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is

In the diagram above , if the magnetic field points into the paper and the force on a current – carrying conductor points upwards, what is the direction of the current?

Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance

The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

The ratio of the coefficient of linear expansion of two metals ^∝₁/_∝2 is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, ^e₁/_e2 is 1:2, the ratio of the original lengths ^l₁/_l2 is

A blacksmith heated a metal whose cubic expansivity is 6.3 x 10\(^{-6}\)K\(^{-1}\). The area expansivity is

A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60^o to the floor. The work done after a distance of 3m is

In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

From the diagram above, the bob of the pendulum has the fastest speed at

The figure above shows 4 forces 3N, 10N, 3√3N and 6N acting on a particle P. The resultant of he four forces is

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

A copper wire was subjected to a tensile stress of 7.7 x 10^7. calculate strain of the wire.

[young modules = 1.1 x 1011 Nm-2]

A metal of volume 40 cm³ is heated from 30 °c to 90 °c, the increase in volume is

An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.

[g = 10 ms²]

If a tube of small radius opened at both ends is placed in a liquid, the liquid will

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]

An object of mass 2 kg moves with a velocity of 10 ms¹ round at circle of radius 4 m. Calculate the centripetal force on the object

If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?

Two balls X and Y weighing 5 g and 50 kg respectively were thrown up vertically at the same time with a velocity of 100 ms1 .How will their positions be one second later?