Physics Past Questions v43 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations

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Physics Past Questions v43 For (JAMB/WAEC/NECO)

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#1. An object is weighted at different locations on the earth. What will be the right observation?

A) Both the mass and weight are constant

A) Both the mass and weight are constant

B) Both the mass and weight vary

B) Both the mass and weight vary

C) the mass is constant while the weight varies

C) the mass is constant while the weight varies

D) the weight is constant while the mass varies

D) the weight is constant while the mass varies

#2. Two metals P and Q 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 Length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is

A) 1:2

A) 1:2

B) 2:1

B) 2:1

C) 8:9

C) 8:9

D) 9:8

D) 9:8

#3. In the diagram above, if the south-poles of two magnets strokes steel bar, the polarities at T and V will respectively be

A) south and north

A) south and north

B) north and south

B) north and south

C) north and north

C) north and north

D) south and south

D) south and south

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

A) the energy released

A) the energy released

B) the electrochemical equivalent

B) the electrochemical equivalent

C) the current flowing

C) the current flowing

D) the charge released

D) the charge released

#5. 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

A) 2.52 x 10-6J

A) 2.52 x 10-6J

B) 6.90 x 10-6J

B) 6.90 x 10-6J

C) 2.52 x 10-4J

C) 2.52 x 10-4J

D) 6.90 x 10-4J

D) 6.90 x 10-4J

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

A) 5 A

A) 5 A

B) 4 A

B) 4 A

C) 3 A

C) 3 A

D) 2 A

D) 2 A

#7. The diagram above shows a balanced metre bridge, the value of x is

A) 75.0 cm

A) 75.0 cm

B) 66.7 cm

B) 66.7 cm

C) 33.3 cm

C) 33.3 cm

D) 25.0 cm

D) 25.0 cm

#8. Three 4Ω resistors connected in parallel have a potential difference of 16 V applied across them. What is the total current in the circuit?

A) 14 A

A) 14 A

B) 12 A

B) 12 A

C) 10 A

C) 10 A

D) 8 A

D) 8 A

#9. In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1kwh is sold at ₦40, the cost of keeping the bulb lighted for a day is

A) ₦1,920.00

A) ₦1,920.00

B) ₦192.00

B) ₦192.00

C) ₦19.20

C) ₦19.20

D) ₦1.92

D) ₦1.92

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

A) has no acceleration between point F and G

A) has no acceleration between point F and G

B) decelerates between F and H

B) decelerates between F and H

C) has a constant soeed between points E and F

C) has a constant soeed between points E and F

D) Accelerates between points F and G

D) Accelerates between points F and G

#11. The diagram above represents balls in an undulating surface. Which of the following option represents positions of stable equilibrium?

A) III, IV and VIII

A) III, IV and VIII

B) II, V and VIII

B) II, V and VIII

C) III, VI and IX

C) III, VI and IX

D) I, IV and VII

D) I, IV and VII

#12. 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

A) 0.500 J

A) 0.500 J

B) 0.250 J

B) 0.250 J

C) 0.050 J

C) 0.050 J

D) 0.025 J

D) 0.025 J

#13. 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?

A) 7:5

A) 7:5

B) 5:7

B) 5:7

C) 1:2

C) 1:2

D) 2:1

D) 2:1

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

A) 400 ms-1

A) 400 ms-1

B) 4,000 ms-1

B) 4,000 ms-1

C) 8,000 ms-1

C) 8,000 ms-1

D) 160,000 ms-1

D) 160,000 ms-1

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

A) low voltage

A) low voltage

B) steady voltage

B) steady voltage

C) high pressure

C) high pressure

D) low pressure

D) low pressure

#16. The ground stated energy for the hydrogen atom is 5.44 x 10-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation. [h = 6.6 x 10-34 Js]

A) 5.0 x 1016 Hz

A) 5.0 x 1016 Hz

B) 2.0 x 1016 Hz

B) 2.0 x 1016 Hz

C) 5.0 x 1015 Hz

C) 5.0 x 1015 Hz

D) 2.0 x 1015 Hz

D) 2.0 x 1015 Hz

E) No correct option

E) No correct option

#17. Transistors are used for the

A) rectification of signals

A) rectification of signals

B) conversion of a.c to d.c

B) conversion of a.c to d.c

C) amplification of signals

C) amplification of signals

D) conversion of d.c to a.c

D) conversion of d.c to a.c

#18. Which of the following is a pure semiconductor?

A) carbon

A) carbon

B) silicon

B) silicon

C) transistor

C) transistor

D) phosphorus

D) phosphorus

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

A) be induced

A) be induced

B) converge

B) converge

C) diverge

C) diverge

D) remain constant

D) remain constant

#20. Power supply is transmitted at a very high voltage and low current in order to

A) make pass through the trasformers

A) make pass through the trasformers

B) increase the power supply

B) increase the power supply

C) make it travel fast

C) make it travel fast

D) prevent overheating of the coil

D) prevent overheating of the coil

#21. A galvanometer with full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5v. the resistance of the galvanometer is

A) 1Ω

A) 1Ω

B) 2Ω

B) 2Ω

C) 5Ω

C) 5Ω

D) 10Ω

D) 10Ω

#22. Two inductors of inductances 5 mll and 15 mll are connected in series and a current of 5A flows through them. the total energy stored in the inductor is

A) 500.0J

A) 500.0J

B) 250.0J

B) 250.0J

C) 62.5J

C) 62.5J

D) 50.0J

D) 50.0J

E) no correct option

E) no correct option

#23. In alternating current circuit at resonance, the angel of lead or lag is

A) π°

A) π°

B) (π)/2°

B) (π)/2°

C) (π)/3°

C) (π)/3°

D) 0°

D) 0°

#24. Which of the following is used for the correction of short sightedness?

A) convex lens

A) convex lens

B) concave lens

B) concave lens

C) convex mirror

C) convex mirror

D) concave mirror

D) concave mirror

#25. Dispersion occurs when white light passes through a glass prism because of the

A) different hidden colours in the glass

A) different hidden colours in the glass

B) different speeds of the colour in the glass

B) different speeds of the colour in the glass

C) defects in the glass

C) defects in the glass

D) high density of the glass

D) high density of the glass

#26. 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

A) 2.50 cm

A) 2.50 cm

B) 6.67 cm

B) 6.67 cm

C) 7.50 cm

C) 7.50 cm

D) 7.63 cm

D) 7.63 cm

#27. The wavelength of a wave traveling with a velocity of 420 ms-1 is 42 m. what is its period?

A) 1.2 s

A) 1.2 s

B) 1.0 s

B) 1.0 s

C) 0.5 s

C) 0.5 s

D) 0.1 s

D) 0.1 s

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

A) the wavelength of sound becomes greater in the bottle

A) the wavelength of sound becomes greater in the bottle

B) sound cannot pass through the bottle

B) sound cannot pass through the bottle

C) sound needs a material medium

C) sound needs a material medium

D) sound can pass through a vacuum

D) sound can pass through a vacuum

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

A) diffraction of sound

A) diffraction of sound

B) refraction of sound

B) refraction of sound

C) superposition

C) superposition

D) reveraberation

D) reveraberation

#30. In comparing the camera and the human eye, the film of the camera function as the

A) retina

A) retina

B) iris

B) iris

C) cornea

C) cornea

D) pupil

D) pupil

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

A) the level of water goes up

A) the level of water goes up

B) the water in the glass outflows

B) the water in the glass outflows

C) the level of water remains unchanged

C) the level of water remains unchanged

D) the level of water drops

D) the level of water drops

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

A) hail

A) hail

B) dew

B) dew

C) fog

C) fog

D) mist

D) mist

#33. A vapour is said to be saturated when

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

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

B) a dynamic aquilibrium exists such that more molecules return to the liquid than are living it

B) a dynamic aquilibrium exists such that more molecules return to the liquid than are living it

C) the temperature of the vapour varies

C) the temperature of the vapour varies

D) the vapour pressure is atmospheric

D) the vapour pressure is atmospheric

#34. The pressure of one mole of an ideal gas of volume 10-2 m3 at a temperature of 27°c is [molar gas constant = 8.3 J mol-1 k-1]

A) 2.49 x 104 Nm-2

A) 2.49 x 104 Nm-2

B) 2.24 x 104 Nm-2

B) 2.24 x 104 Nm-2

C) 2.49 x 105 Nm-1

C) 2.49 x 105 Nm-1

D) 2.24 x 105 Nm-1

D) 2.24 x 105 Nm-1

#35. Which of the following has no effect on radiation?

A) nature of surface

A) nature of surface

B) density

B) density

C) surface area

C) surface area

D) temperature

D) temperature

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

A) a density bottle

A) a density bottle

B) an eureka can

B) an eureka can

C) a pipette

C) a pipette

D) a burette

D) a burette

#37. A hydrometer is an instrument used in measuring

A) vapour pressure of a fluid

A) vapour pressure of a fluid

B) density of liquid

B) density of liquid

C) relative humidity of a liquid

C) relative humidity of a liquid

D) relative density of a liquid

D) relative density of a liquid

#38. One special advantage of alcohol over mercury as a thermometric liquid is its

A) low density

A) low density

B) low freezing point

B) low freezing point

C) high specific

C) high specific

D) low boiling point

D) low boiling point

#39. The density of a certain oil on frying becomes 0.4 kgm-3 with the volume of 20m3. what will be its initial volume when its initial density is 0.8 kgm-3 assuming no loss of oil due to spillage?

A) 12 kgm-3

A) 12 kgm-3

B) 10 kgm-3

B) 10 kgm-3

C) 8 kgm-3

C) 8 kgm-3

D) 5 kgm-3

D) 5 kgm-3

#40. Heat is radiated by hot objects in the form

A) x-rays

A) x-rays

B) light energy

B) light energy

C) infrared rays

C) infrared rays

D) solar energy

D) solar energy

#41. 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?

A) 2 ms-2

A) 2 ms-2

B) 5 ms-2

B) 5 ms-2

C) 20 ms-2

C) 20 ms-2

D) 25 ms-2

D) 25 ms-2

#42. The surfaces of conveyor belts are made rough so as to

A) protect them while carrying loads

A) protect them while carrying loads

B) prevent the loads from slipping

B) prevent the loads from slipping

C) enable them to carry more load

C) enable them to carry more load

D) make them stronger

D) make them stronger

#43. 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

A) 55. 6 %

A) 55. 6 %

B) 50.0%

B) 50.0%

C) 33.3%

C) 33.3%

D) 22.2%

D) 22.2%

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

A) 0.75 J

A) 0.75 J

B) 7.50 J

B) 7.50 J

C) 75.00 J

C) 75.00 J

D) 750.00 J

D) 750.00 J

#45. 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?

A) 300 N

A) 300 N

B) 200 N

B) 200 N

C) 150 N

C) 150 N

D) 100 N

D) 100 N

#46. 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?

A) 30 kmh-1

A) 30 kmh-1

B) 130 kmh-1

B) 130 kmh-1

C) 200 kmh

C) 200 kmh

D) 230 kmh-1

D) 230 kmh-1

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

A) the feather will be brown away by the wind while stone will drop steadily

A) the feather will be brown away by the wind while stone will drop steadily

B) the stone and the feather will both reach the ground a the same time

B) the stone and the feather will both reach the ground a the same time

C) the feather will reach the ground first

C) the feather will reach the ground first

D) the stone will reach the ground first

D) the stone will reach the ground first

#48. Oxidation of the filament in a light bulb is prevented by the introduction of

A) hydrogen

A) hydrogen

B) oxygen

B) oxygen

C) argon

C) argon

D) mercury vapour

D) mercury vapour

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