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}_{92}U decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomicnumbers 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?