Physics (JAMB) scoreboard
Physics (JAMB) Questions
#1.
Two cars moving in the same direction have speeds of 100kmh-1 and 130kmh-1. What is the velocity of the faster car as measured by an observer in the slower car?
#2.
A stone and a feather dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?
#3.
A car moves with an initial velocity of 25 ms-1 and reaches a velocity of 45 ms-1 in 10s. What is the acceleration of the car?
#4.
An object is weighed at different locations on the earth. What will be the right observation?
#5.
A bob of weight 0.1N hangs from a massless string of length 50cm.
A variable horizontal force which increases from zero is applied to pull the bob until the string makes an angle of 600 with the vertical.
The work done is
#6.
The surfaces of conveyor belts are made rough so as to
#7.
A machine of velocity ratio 6 requires an effort of 400N to raise a load of 800N through 1m. Find the efficiency of the machine.
#8.
If a wire 30cm long is extended to 30.5cm by a force of 300N. Find the strain energy of the wire.
#9.
In a hydraulic press, the pump piston exerts a pressure of 100 Pa on the liquid. What force is exerted in the second piston of crosssectional area 3 m2 ?
#10.
The accurate measurement of the relative density of a substance in its powered form is done with a beam balance and
#11.
A hydrometer is an instrument used in measuring
#12.
One special advantage of alcohol water over mercury as a thermometric liquid is its
#13.
Two metals P and Q of lengths l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of their lengths is 3:4.
What is the ratio of increase in lengths of P to Q?
#14.
The density of a certain oil on frying becomes 0.4kgm-3 with a volume of 20m-3. What will be its initial volume when its initial density is 0.8kgm-3 assuming no loss of oil due to spillage?
#15.
Heat is radiated by all hot objects in the form of
#16.
If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?
#17.
The small droplet of water that forms on the grass in the early hours of the morning is
#18.
A vapour is said to be saturated when
#19.
The pressure of one mole of an ideal gas of volume 10-2m3 at a
temperature of 27⁰C is .....
[Molar gas constant = 8.3 Jmol-1K -1]
#20.
Which of the following has no effect on radiation?
#21.
The wavelength of a wave travelling with a velocity of 420ms-1 is 42m. What is its period?
#22.
The sound of an electric bell dies down slowly when air is slowly pumped out from a bottle because
#23.
During a thunderstorm, the sound is heard over a long time. This phenomenon is referred to as
#24.
The velocity of sound in air at 16⁰C is 340ms-1. What will it be when the pressure is doubled and its temperature raised to 127⁰C?
#25.
In comparing the camera and the human eye, the film of the camera functions as the
#26.
An object 4 cm high is placed 15 cm from a concave mirror of focal length 5 cm. The size of the image is
#27.
An object is embedded in a block of ice, 10cm below the
plane surface. If the refractive index of the ice is 1.50, the apparent depth of the object below the surface is
#28.
Which of the following is used for the correction of short-sightedness?
#29.
Dispersion occurs when white light passes through a glass prim because of the
#30.
When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will
#31.
Three capacitors of capacitance, 2μF, 4μF and 8μF are connected in parallel and a p.d of 6V is maintained across each capacitor, the total energy stored is
#32.
A cell of emf 12V and internal resistance 4Ω is connected to an external resistor of resistance 2 Ω
Find the current flow.
#33.
Three 4Ω resistors connected in parallel have 3 potential difference of 16V applied across them. What is the total current in the circuit
#34.
Power supply is transmitted at a very high voltage and low current in order to
#35.
A galvanometer with full-scale deflection of 10mA is to be converted to a voltmeter with full-scale deflection of 5 V. If a series resistance of 498Ω is used for the conversion, the resistance of the galvanometer is
#36.
Two inductors of inductances 5 mH and 15mH are connected in series and a current of 5A flows through them. The total energy stored in the inductors is
#37.
In Faraday’s law of electrolysis, a graph of mass deposited against the quantity of electricity is plotted. The slope of the graph gives
#38.
The radioisotope 235 92U decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic
numbers of the resulting daughter element?
#39.
Transistors are used for the
#40.
Which of the following is a pure semiconductor?
#41.
A carpenter on top of a roof 20.m high dropped a hammer of
mass 1.5kg and it fell freely to the ground. The kinetic energy of the hammer just before hitting the ground is .......
[g = 10ms-2]
#42.
Two balls X and Y weighing 5g and 50kg respectively were thrown up vertically at the same time with a velocity of 100ms-1 .
How will their positions be one second later?
#43.
A man standing on a lift that is descending does not feel any weight because
#44.
An object of mass 2kg moves with a velocity of 10ms-1 round a circle of radius 4m. Calculate the centripetal force on the object
#45.
If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?
[g = 10ms-2]
#46.
If a tube of small radius opened at both ends is placed in a liquid, the liquid will
#47.
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?
#48.
I. High thermal capacity
II. High sensitivity
III. Easy readability
IV. Accuracy over a wide range of temperatures
From the statements above, the qualities of a good thermometer are
#49.
A machine is used to lift a load of 20 N through a height of 10m. if the efficiency of the machine is 40%, how much work is done?
#50.
Which of the following could be effectively used to reduce friction?