2010 JAMB Physics Past Questions & Answers

Question 1

The density of a certain oil on frying becomes 0.4 kgm$^{-3}$ with the volume of 20m$^{3}$. what will be its initial volume when its initial density is 0.8 kgm$^{-3}$ assuming no loss of oil due to spillage?

Accepted Answer

B. 10m3

Answer

A. 12m3

Answer

C. 8m3

Answer

D. 5m3

Question 2

If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?

Accepted Answer

C. the level of water remains unchanged

Answer

A. the level of water goes up

Answer

B. the water in the glass outflows

Answer

D. the level of water drops

Question 3

Two cars moving in the same direction have speeds of 100 kmh$^{-1}$ and 130 kmh$^{-1}$. What is the velocity of the faster car as measured by an observer in the slower car?

Accepted Answer

A. 30 $kmh^{-1}$

Answer

B. 130 $kmh^{-1}$

Answer

C. 200 kmh

Answer

D. 230 $kmh^{-1}$

Question 4

In comparing the camera and the human eye, the film of the camera function as the?

Accepted Answer

A. retina

Answer

B. iris

Answer

C. cornea

Answer

D. pupil

Question 5

THe velocity of sound in air at 16oC is 340$ms^{-1}$. What will it be when the pressure is doubled and its temperature raised to 127ºC?

Accepted Answer

A. 400 $ms^{-1}$

Answer

B. 4,000 $ms^{-1}$

Answer

C. 8,000 $ms^{-1}$

Answer

D. 160,000 $ms^{-1}$

Question 6

A galvanometer with full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5v.  if a series resistance of 498Ω is used for the conversion, the resistance of the galvanometer is ?

Accepted Answer

B. 2Ω

Answer

A. 1Ω

Answer

C. 5Ω

Answer

D. 10Ω

Question 7

A cell of e.m.f 12V and internal resistance 4Ω is connected to an external resistor of resistance 2Ω. Find the current flow.

Accepted Answer

D. 2 A

Answer

A. 5 A

Answer

B. 4 A

Answer

C. 3 A

Question 8

The small droplet of water that forms on the grass in the early hours of the morning is

Accepted Answer

B. dew

Answer

A. hail

Answer

C. fog

Answer

D. mist

Question 9

The radioisotope $ ^{235}_{92}U $ decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic number of the resulting element?

Accepted Answer

C. 227 and 91

Answer

A. 215 and 88

Answer

B. 91 and 227

Answer

D. 92 and 238

Question 10

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 cross sectional area 3 m2?

Accepted Answer

A. 300 N

Answer

B. 200 N

Answer

C. 150 N

Answer

D. 100 N

Question 11

A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine

Accepted Answer

C. 33.3%

Answer

A. 55. 6 %

Answer

B. 50.0%

Answer

D. 22.2%

Question 12

The process whereby a substance changes from a solid to liquid when heat is applied, is called?

Accepted Answer

D. Fusion

Answer

A. Evaporation

Answer

B. Vaporization

Answer

C. Fission

Question 13

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?

Accepted Answer

A. 2 $ms^{-2}$

Answer

B. 5 $ms^{-2}$

Answer

C. 20 $ms^{-2}$

Answer

D. 25 $ms^{-2}$

Question 14

Two metals P and Q of length 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 lengths is 3:4. What is the ratio of increase in length of P to Q?

Accepted Answer

C. 1:2

Answer

A. 7:5

Answer

B. 5:7

Answer

D. 2:1

Question 15

The sound of an electricity bell dies down slowly when air is slowly pumped out from a bottle because

Accepted Answer

C. sound needs a material medium

Answer

A. the wavelength of sound becomes greater in the bottle

Answer

B. sound cannot pass through the bottle

Answer

D. sound can pass through a vacuum

Question 16

An object is embedded in a block of ice, 10 cm below the plane surface. if the refractive index of the ice is 1.50, the apparent depth below the surface is?

Accepted Answer

B. 6.67 cm

Answer

A. 2.50 cm

Answer

C. 7.50 cm

Answer

D. 7.63 cm

Question 17

A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?

Accepted Answer

B. the stone and the feather will both reach the ground at the same time

Answer

A. the feather will be blown away by the wind while stone will drop steadily

Answer

C. the feather will reach the ground first

Answer

D. the stone will reach the ground first

Question 18

The accurate measurement of the relative density of a substance in its powdered form is done with a beam balance and?

Accepted Answer

A. a density bottle

Answer

B. an eureka can

Answer

C. a pipette

Answer

D. a burette

Question 19

If a wire 30 cm long is extended to 30.5 cm by a force of 300 N. find the strain energy of wire

Accepted Answer

A. 0.75 J

Answer

B. 7.50 J

Answer

C. 75.00 J

Answer

D. 750.00 J

Question 20

One special advantage of alcohol over mercury as a thermometric liquid is its?

Accepted Answer

B. low freezing point

Answer

A. low density

Answer

C. high specific

Answer

D. low boiling point

Question 21

An object is weighed at different locations on the Earth. What will be the right observation?

Accepted Answer

C. The mass is constant while the weight varies

Answer

A. Both the mass and weight vary

Answer

B. The weight is constant while the mass varies

Answer

D. Both the mass and weight are constant

Question 22

Which of the following is used for the correction of short sightedness?

Accepted Answer

B. concave lens

Answer

A. convex  lens

Answer

C. convex mirror

Answer

D. concave mirror

Question 23

Dispersion occurs when white light passes through a glass prism because of the?

Accepted Answer

B. different speeds of the colour in the glass

Answer

A. different hidden colours in the glass

Answer

C. defects in the glass

Answer

D. high density of the glass

Question 24

In a discharge tube, most of the gas is pumped out so that electricity is conducted at?

Accepted Answer

D. low pressure

Answer

A. low voltage

Answer

B. steady voltage

Answer

C. high pressure

Question 25

A vapor is said to be saturated when?

Accepted Answer

A. a dynamic equilibrium exists between liquid molecules and the vapour molecules

Answer

B. a dynamic equilibrium exists such that more molecules return to the liquid than are leaving it

Answer

C. the temperature of the vapour varies

Answer

D. the vapour pressure is atmospheric

Question 26

The surfaces of conveyor belts are made rough so as to?

Accepted Answer

B. prevent the loads from slipping

Answer

A. protect them while carrying loads

Answer

C. enable them to carry more load

Answer

D. make them stronger

Question 27

The pressure of one mole of an ideal gas of volume 10$^-2$ m$^3$ at a temperature of 27°c is [molar gas constant = 8.3 J mol$^{-1}$ k$^{-1}$]

Accepted Answer

C. 2.49 x 105 $Nm^{-2}$

Answer

A. 2.49 x 104 $Nm^{-2}$

Answer

B. 2.24 x 104 $Nm^{-2}$

Answer

D. 2.24 x 105 $Nm^{-1}$

Question 28

In alternating current circuit at resonance, the angle of lead or lag is?

Accepted Answer

D. 0°

Answer

A. π°

Answer

B. (π)/2°

Answer

C. (π)/3°

Question 29

The wavelength of a wave traveling with a velocity of 420 ms$^{-1}$ is 42 m. What is its period?

Accepted Answer

D. 0.1 s

Answer

A. 1.2 s

Answer

B. 1.0 s

Answer

C. 0.5 s

Question 30

Power supply is transmitted at a very high voltage and low current in order to?

Accepted Answer

D. prevent overheating of the coil

Answer

A. make pass through the trasformers

Answer

B. increase the power supply

Answer

C. make it travel fast

Question 31

A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is?

Accepted Answer

D. 0.025 J

Answer

A. 0.500 J

Answer

B. 0.250 J

Answer

C. 0.050 J

Question 32

An object 4 cm high is placed 15 cm from a concave mirror of focal length 5 cm. The size of the image is?

Accepted Answer

A. 2 cm

Answer

B. 3 cm

Answer

C. 4 cm

Answer

D. 5 cm

Question 33

In Faradays law of electrolysis, a graph of the mass deposited against the quantity of electricity is plotted. The slope of the graph gives?

Accepted Answer

B. the electrochemical equivalent

Answer

A. the energy released

Answer

C. the current flowing

Answer

D. the charge released

Question 34

During a thunderstorm, the sound is heard over a long time. this phenomenon is referred to as?

Accepted Answer

D. reveraberation

Answer

A. diffraction of sound

Answer

B. refraction of sound

Answer

C. superposition

Question 35

When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will?

Accepted Answer

C. diverge

Answer

A. be induced

Answer

B. converge

Answer

D. remain constant

Question 36

A hydrometer is an instrument used in measuring?

Accepted Answer

D. relative density of a liquid

Answer

A. vapour pressure of a fluid

Answer

B. density of  liquid

Answer

C. relative humidity of a liquid

Question 37

Three capacitors of capacitance 2μF, 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor, the total energy stored is?

Accepted Answer

C. 2.52 x 10-4J

Answer

A. 2.52 x 10-6J

Answer

B. 6.90 x 10-6J

Answer

D. 6.90 x 10-4J

Question 38

Transistors are used for the?

Accepted Answer

C. amplification of signals

Answer

A. rectification of signals

Answer

B. conversion of a.c to d.c

Answer

D. conversion of d.c to a.c

Question 39

Which of the following is a pure semiconductor?

Accepted Answer

B. silicon

Answer

A. carbon

Answer

C. transistor

Answer

D. phosphorus

Question 40

The diagram above shows a velocity - time graph. The statement that is true about this motion is that the car?

Accepted Answer

A. has no acceleration between point F and G

Answer

B. decelerates between F and H

Answer

C. has a constant speed between points E and F

Answer

D. Accelerates between points F and G

Question 41

Heat is radiated by hot objects in the form?

Accepted Answer

C. infrared rays

Answer

A. x-rays

Answer

B. light energy

Answer

D. solar energy

Question 42

Which of the following has no effect on radiation?

Accepted Answer

B. density

Answer

A. nature of surface

Answer

C. surface area

Answer

D. temperature

2010 JAMB Physics Past Questions

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