Physics Past Questions v39 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 v39 For (JAMB/WAEC/NECO)

Results

#1. Find the effective resistance in the diagram above

A) 6 Ω

A) 6 Ω

B) 12 Ω

B) 12 Ω

C) 18 Ω

C) 18 Ω

D) 24 Ω

D) 24 Ω

#2. Given the inductor of inductance 5mH, 10mH and 20mH connected in series, the effective inductance is

A) 0.35mH

A) 0.35mH

B) 3.50mH

B) 3.50mH

C) 2.90mH

C) 2.90mH

D) 35.0mH

D) 35.0mH

#3. If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron [m = 9.1 x 10-31kg, e = 1.6 x 10-19C, h = 6.6 x 10-34js]

A) 1.22 x 10-11m

A) 1.22 x 10-11m

B) 3.87 x 10-10m

B) 3.87 x 10-10m

C) 2.27 x 1011m

C) 2.27 x 1011m

D) 2.27 x 1014m

D) 2.27 x 1014m

#4. The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by

A) moving Q nearer to O

A) moving Q nearer to O

B) moving P nearer to O

B) moving P nearer to O

C) addding a weight Q to Q

C) addding a weight Q to Q

D) moving P further away from O

D) moving P further away from O

#5. The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N

A) 275N

A) 275N

B) 325N

B) 325N

C) 375N

C) 375N

D) 573N

D) 573N

#6. The diagram above is the heating curve for a solid QR is the

A) melting region

A) melting region

B) boiling region

B) boiling region

C) sublimation region

C) sublimation region

D) evaporating process

D) evaporating process

#7. The above figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction

A) parallel to OX

A) parallel to OX

B) parallel to OY

B) parallel to OY

C) 60o to OX

C) 60o to OX

D) 60v to OY

D) 60v to OY

#8. If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?

A) 10 cm

A) 10 cm

B) 15 cm

B) 15 cm

C) 20 cm

C) 20 cm

D) 25 cm

D) 25 cm

#9. The dimension of electromotive force are `

A) ML2T-3I-1

A) ML2T-3I-1

B) ML2T-3I-2

B) ML2T-3I-2

C) M2LT-2I-1

C) M2LT-2I-1

D) M2L2T-1I-1

D) M2L2T-1I-1

#10. The resultant of two forces 12N and 5N is 13N. What is the angle between the two forces?

A) 0o

A) 0o

B) 45o

B) 45o

C) 90o

C) 90o

D) 180o

D) 180o

#11. A force F required to keep a 5 kg mass moving round a cycle of radius 3.5 m at a speed of 7 ms-1. What is the speed, if the force is tripled?

A) 4.0 ms-1

A) 4.0 ms-1

B) 6.6 ms-1

B) 6.6 ms-1

C) 12.1 ms-1

C) 12.1 ms-1

D) 21.0 ms-1

D) 21.0 ms-1

#12. A body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6N and 8N. Calculate the acceleration of the motion.

A) 2.5 ms-2

A) 2.5 ms-2

B) 3.0 ms-2

B) 3.0 ms-2

C) 4.0 ms-2

C) 4.0 ms-2

D) 4.5 ms-2

D) 4.5 ms-2

#13. A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is

A) 900 JK-1

A) 900 JK-1

B) 90 JK-1

B) 90 JK-1

C) 100 JK-1

C) 100 JK-1

D) 200 JK-1

D) 200 JK-1

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

A) 2 cm

A) 2 cm

B) 3 cm

B) 3 cm

C) 4 cm

C) 4 cm

D) 5 cm

D) 5 cm

#15. I. for current amplification.II. for voltage stabilization. III. for power amplification.IV. as a switch.which of the above are the uses of transistor?

A) I,II,III and IV

A) I,II,III and IV

B) I,III, and IV only

B) I,III, and IV only

C) I, II and III only

C) I, II and III only

D) I,II and IV only

D) I,II and IV only

#16. The d.c generator has essentially the same components as the a.c generator except the presence of?

A) slip-ring

A) slip-ring

B) carbon brushes

B) carbon brushes

C) split ring

C) split ring

D) armature

D) armature

#17. A step-down transformer has a power output of 50 W and efficiency of 80%. if the mains supply voltage is 200 v, calculate the primary current of the transformer.

A) 0.31 A

A) 0.31 A

B) 3.20 A

B) 3.20 A

C) 3.40 A

C) 3.40 A

D) 5.00 A

D) 5.00 A

#18. Caesium has a work function of 3 x 10-19J. the maximum energy of liberated electrons when it is illuminated by light of frequency 6.7 x 1014HZ is? [h = 6.6 x 1010-34Js]

A) 1.42 x 10-19J

A) 1.42 x 10-19J

B) 3.00 x 10-19J

B) 3.00 x 10-19J

C) 4.42 x 1010-19J

C) 4.42 x 1010-19J

D) 7.42 x 10-19J

D) 7.42 x 10-19J

#19. Zener diode is used for?

A) current amplification

A) current amplification

B) power amplification

B) power amplification

C) voltage regulation

C) voltage regulation

D) energy conversion

D) energy conversion

#20. When a pure semiconductor is heated, its resistance

A) increases

A) increases

B) decreases

B) decreases

C) remains the same

C) remains the same

D) increases and then decreases

D) increases and then decreases

#21. In the microscope, the eyepiece lens merely acts as?

A) an inverter

A) an inverter

B) a refiner

B) a refiner

C) a diminisher

C) a diminisher

D) a magnifier

D) a magnifier

#22. An observer with normal eyes views an object with magnifying glass of focal length 5 cm. the angular magnification is? [least distance of distinct vision D = 25 cm]

A) -6

A) -6

B) -5

B) -5

C) 5

C) 5

D) 6

D) 6

#23. A short chain is sometimes attached to the back of a petrol tanker to?

A) generate more friction

A) generate more friction

B) ensure the balancing of the tanker

B) ensure the balancing of the tanker

C) caution the driver when overspeeding

C) caution the driver when overspeeding

D) conduct excess charges to the car

D) conduct excess charges to the car

#24. An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generatoris 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated?

A) 11:1

A) 11:1

B) 1:11

B) 1:11

C) 12:11

C) 12:11

D) 11:12

D) 11:12

#25. A generator is on daily use and in the process, ten 60 W and five 40 W tungsten bulbs are on for the same time interval. the energy consumed daily is?

A) 0.96 kWh

A) 0.96 kWh

B) 19.2 kWh

B) 19.2 kWh

C) 9.60 kWh

C) 9.60 kWh

D) 19.20 kWh

D) 19.20 kWh

#26. I. Total internal reflection of light. II. Conservation of light energy. III. Relative motion of the earth, sun and moon. IV. Rectilinear propation of light. Which of the above is a phenomenon of total solar eclipse?

A) I and IV only

A) I and IV only

B) II and IV only

B) II and IV only

C) I and III only

C) I and III only

D) III and IV only

D) III and IV only

#27. An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?

A) 3.0 cm

A) 3.0 cm

B) 8.0 cm

B) 8.0 cm

C) 12.0 cm

C) 12.0 cm

D) 16.0 cm

D) 16.0 cm

#28. An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is?

A) 20 cm

A) 20 cm

B) 15 cm

B) 15 cm

C) 10 cm

C) 10 cm

D) 5 cm

D) 5 cm

#29. Convex mirror are used as driving mirrors because images formed are?

A) erect, virtual and diminished

A) erect, virtual and diminished

B) erect, real and diminished

B) erect, real and diminished

C) erect, virtual and magnified

C) erect, virtual and magnified

D) inverted virtual and diminished

D) inverted virtual and diminished

#30. An object placed at the bottom of a well full of clear water appears closer to the surface due to?

A) diffraction

A) diffraction

B) reflection

B) reflection

C) refraction

C) refraction

D) polarization

D) polarization

#31. If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?

A) 25%

A) 25%

B) 33%

B) 33%

C) 75%

C) 75%

D) 82%

D) 82%

#32. n a good thermos flask, the main cause of heat loss is?

A) conduction through the cork

A) conduction through the cork

B) the plastic base of the thermos flask

B) the plastic base of the thermos flask

C) the silvered walls and shiny metals

C) the silvered walls and shiny metals

D) the outer cover or jacker

D) the outer cover or jacker

#33. Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length Options

A) 12.4 m

A) 12.4 m

B) 15.7 m

B) 15.7 m

C) 17.5 m

C) 17.5 m

D) 18.6 m

D) 18.6 m

#34. The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?

A) wavelength

A) wavelength

B) harmonies

B) harmonies

C) frequency

C) frequency

D) velocity

D) velocity

#35. When cold water is poured on a can containing hot water, the can collapses because the

A) steam condeses and occupies the partial vacuum in the can

A) steam condeses and occupies the partial vacuum in the can

B) external air pressure counter balances the pressure within the can .

B) external air pressure counter balances the pressure within the can .

C) steam expands to occupy the vacuum remaining in the can

C) steam expands to occupy the vacuum remaining in the can

D) external pressure becomes greater than the pressure within the can

D) external pressure becomes greater than the pressure within the can

#36. An empty density bottle weighs 2 N. if its weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is

A) (1)/3

A) (1)/3

B) (2)/3

B) (2)/3

C) (1)/5

C) (1)/5

D) (2)/5

D) (2)/5

#37. The thermometric properties of a thermocouple is the change in?

A) equivalent resistance

A) equivalent resistance

B) electromotive force

B) electromotive force

C) colour

C) colour

D) pressure

D) pressure

#38. During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?

A) the clock gians time

A) the clock gians time

B) the accuracy of the clock is not affected

B) the accuracy of the clock is not affected

C) the clock losses time

C) the clock losses time

D) the clock stops working

D) the clock stops working

#39. A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?

A) 508 cm3

A) 508 cm3

B) 516 cm3

B) 516 cm3

C) 608 cm3

C) 608 cm3

D) 616 cm3

D) 616 cm3

#40. If a body mass 5kg is thrown vertically upwards with velocity u,at what height will the potential energy equal to the kinetic energy?

A) h =(u)2/g

A) h =(u)2/g

B) h = (u)2/4g

B) h = (u)2/4g

C) h = (2u)2/g

C) h = (2u)2/g

D) h = (u)2/2g

D) h = (u)2/2g

#41. Counting of currency notes with moist fingers is based on the principles of?

A) diffusion

A) diffusion

B) cohesion

B) cohesion

C) adhesion

C) adhesion

D) viscosity

D) viscosity

#42. A motorcycle of mass 100kg moves round in a circle of radius 10m with a velocity of 5 ms-1. find the coefficient of friction between the road and the tyres.

A) 25.00

A) 25.00

B) 2.50

B) 2.50

C) 0.50

C) 0.50

D) 0.25

D) 0.25

#43. A spring of force constant 500 NM-1 is compressed such that its length shortens by 5cm. The energy stored in the spring is?

A) 0.625 J

A) 0.625 J

B) 6.250 J

B) 6.250 J

C) 62.500 J

C) 62.500 J

D) 625.000 J

D) 625.000 J

#44. In the hare's apparatus, water rises to a height of 26.5 cm in one limb. if a liquid rises to a height of 20.4 cm in the other limb, what is the relative density of the liquid?

A) 0.8

A) 0.8

B) 1.1

B) 1.1

C) 1.2

C) 1.2

D) 1.3

D) 1.3

#45. I. Force (N) II.Torque (NM) III. Current (A) IV. Power (W) Which of the above are the correct S. I: units of the quantities indicated?

A) I and II only

A) I and II only

B) I and III only

B) I and III only

C) I, II and III only

C) I, II and III only

D) I, III and IV only

D) I, III and IV only

#46. Which of the following is NOT a vector quantity?

A) altitude

A) altitude

B) acceleration

B) acceleration

C) displacement

C) displacement

D) weight

D) weight

#47. If a wheel 1.2 m in diameter rotates at one revolation per second, calculate the velocity of the wheel.

A) 3.6 ms-1

A) 3.6 ms-1

B) 3.77 ms-1

B) 3.77 ms-1

C) 4.0 ms-1

C) 4.0 ms-1

D) 7.5 ms-1

D) 7.5 ms-1

#48. I. All the three forces must be concurrent. II. The upward force is equal to the downward force. III. The algebraic sum of the moment about any point must be zero.which of the above conditions must hold for a body acted upon by a system of three coplanar forces equilibrium?

A) I and II only

A) I and II only

B) I and III only

B) I and III only

C) II and III only

C) II and III only

D) I, II and III

D) I, II and III

#49. What is the frquency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25 s?

A) 0.01 Hz

A) 0.01 Hz

B) 0.04 Hz

B) 0.04 Hz

C) 2.27 Hz

C) 2.27 Hz

D) 3.60 Hz

D) 3.60 Hz

#50. The diagram above shoes three forces F1, F2 and F3, which of the following equations is correct?

A) F3 = F1 + F2

A) F3 = F1 + F2

B) F2 = F1 + F3

B) F2 = F1 + F3

C) F1 = F2 - F3

C) F1 = F2 - F3

D) F1 = F2 + F3

D) F1 = F2 + F3

Finish

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