WAEC Physics Questions and Answers 2020/2021 Objectives/Essay PDF

WAEC Physics Questions and Answers 2020/2021 objectives/Essay. The WAEC Physics exam is one of the major subjects Science Students should take very seriously.  On this page, You will have all the necessary updates on the ongoing WAEC Physics Exams, all you need is to follow the necessary steps.

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WAEC Physics Questions and Answers 2019/2020 to OBJ/ESSAY

The Solutions to the questions can be downloaded in PDF format once it is out. The resources below on WAEC Physics Questions and Answers 2020/2021 to OBJ/ESSAY have been provided to assist you to understand the required standards expected in the physics final 2020 Examination.  The 2020 WAEC on physics will be divided into 3 papers of which must be taken. Papers 1 and 2 will be a composite paper to be taken at the same sitting.

WAEC Physics Examination Schedule

PAPER 1 : Will consist of fifty multiple-choice objective questions drawn from Section A of the syllabus. Candidates will be required to answer all the questions within 1 hour for 50 marks.

PAPER 2 : Will be a 2-hour essay paper covering the entire syllabus and carrying a maximum of 100 marks. The paper will be in two sections:

Section A : Will consist of ten short structured questions drawn from the common portion of the syllabus (i.e. Section A of the syllabus). Candidates will be required to answer all the questions for 25 marks.

Section B : Will consist of two questions from the common portion of the SyllabOption. Section A of the syllabus) and two other questions from the Section of the syllabus which is peculiar to the country of the candidate (i.e. either) Section B or C of the syllabus). Candidates will be required to answer any three of the questions. Each question shall carry 25 marks.

WAEC Physics Past Questions and Answers

 Below are WAEC Physics past Questions and Answers 2020/2021

1. Calculate the Speed of a car Covering a Disteance of 150m in 10 second.

  • A. 25m/s
  • B. 10m/s
  • C. 15m/s
  • D. 1.5m/s

ANSWER: C (15m/s)

2.One of quantities below is not a Fundamental Quantity?

  • A. Time
  • B. Length
  • C. Temperature
  • D. Speed

ANSWER: D (Speed)

3. A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?

  • A. 17m
  • B. 34m
  • C. 85m
  • D. 170m
  • E. 680m

ANSWER: C ( X = vt/2 = (340 x 0.5)/2 = 85m )

4. A sounding tuning fork is brought near the end of a pipe containing an air column and the loudness of the sound increases. This effect is due to

  • A. diffraction
  • B. an echo
  • C. resonance
  • D. interference
  • E. reverberation

ANSWER: C ( resonance )

5.If the leaves a positively charged electroscope collapse completely as an object is brought near the cap of the electroscope, the objects possesses

  • A. an equal amount of positive charge
  • B. less amount of negative charge
  • C. no charge
  • D. a positive charge
  • E. an equal amount of negative charge

ANSWER: E ( an equal amount of negative charge )

6. A transformer with 55500 turns in its primary is used between a 240V a. c supply and a 120V kettle. Calculate the number of turns in the secondary

  • A. 11000
  • B. 2750
  • C. 460
  • D. 232
  • E. 10

ANSWER: B (

Ep/Es = np/ns
240/120 = 5500/ns

=> ns = 2750 )

7.Local action is normally prevented from taking place in a simple electric cell by

  • A. introducing an oxidising agent into the acid
  • B. not drawing current continuously for long periods
  • C. amalgamating the surface of the zinc plate
  • D. using a porous pot to isolate the zinc plate from the acid
  • E. using dilute sulphuric acid

ANSWER: C ( amalgamating the surface of the zinc plate )

WAEC Physics Sample Practice Questions

1.The total energy required to send a unit positive charge round a complete electrical circuit is theA) kinetic energy

  • B) potential difference
  • C) electromotive force
  • D) electrical energy

2.Which the following is an essential physical property of the wires used for making fuse?A) low density

  • B) high thermal conductive
  • C) low electrical resistivity
  • D) low melting point

3.Which of following is most suitable for protecting the circuit of 2000W electric iron connected to a 250y mains?

  • A) 13A
  • B) 8A
  • C) 5A
  • D) 3A

4.Electrical power is transmitted at a high voltage rather than low voltage because the amount of energy loss is due to

  • A) heat dissipation
  • B) production of eddy currents
  • C) excessive current discharge
  • D) excessive voltage discharge

5.A lamp is rated 240V, 60W. The resistance of the filament is

  • A) 960ΩΩ
  • B) 16ΩΩ
  • C) 15ΩΩ
  • D) 4ΩΩ

6.A 0 – 1 OmA galvanometer with a coil resistance of 3052 can be converted to a 0-10mA ammeter by using

  • A) 0.03 series resistor
  • B) 0.03 shunt resistor
  • C) 9.99 shunt resistor
  • D) 9.99 series resistor

7.What precaution should a manufacturer take to ensure that energy loss in a transformer is minimized?

  • A) the winding of the transformer should be made of high resistance wire
  • B) the core should be made of thin sheets of metal
  • C) no magnetic material should be used to make the core
  • D) the flux linking the primary with the secondary coils should be minimum

8.A substance has a half life of 3mm. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

  • A) 200
  • B) 1,200
  • C) 1,600
  • D) 2,400

9.The photocell works on the principle of theA) voltaic cell

  • B) emission of electron by incident radiation
  • C) emission of protons by incident electrons
  • D) photographic plate

A light wave of frequency 5 ××l01414Hz moves through water which has refractive index of 4343. Calculate the wavelength in water if the velocity of light in air is 3 ××1088ms−1−1

  • A) 4.5 ××10−7−7m
  • B) 6.0 ××10−7−7m
  • C) 1.7 ××1066m
  • D) 2.2 ××1066m Google+
  1. A satellite is in a parking orbit if its period is
  2. More than the period of the earth
  3. Equal to the period of the earth
  4. The square of the period of the earth
  5. Less than the period of the earth
  1. What does not drop through an open umbrella of silk material unless the inside of the umbrella is touched
  2. Osmotic pressure
  3. Capillarity
  4. Surface tension
  5. Viscosity
  1. A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1, determine the work done by the friction
  2. 2 x 10-3J
  3. 2 x 102J
  4. 2 x 10-4J
  5. 2 x 101J [g= 10ms-2]
  1. The stylus of a phonograph record exerts a force of 77. x 10-2N on a groove of radius 10-5m. Compute the pressure exerted by the stylus on the groove.
  2. 2.42 x 109 Nm-2
  3. 4.90 x 108Nm-2
  4. 2.45 x 108Nm-2
  5. 3.45 x 108Nm-2
  1. A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction.
  2. Tangential to the circular path
  3. Perpendicular to the circular path
  4. Towards the centre of the circle
  5. Parallel to the circular path.
  1. A test tube of radius 1.0cm is loaded to 8.8g. If it is placed upright in water, find the depth to which it would sink.
  2. 25.2 cm
  3. 2.8 cm
  4. 28.0 cm
  5. 5.2 cm [g = 10ms-2 density of water 1 000kgm-3].
  1. A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the centre of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is
  2. 20 N
  3. 30 N
  4. 60 N
  5. 15 N
  1. On top of a spiral spring of force constant 500 Nm-1 is placed a mass of 5 x 10-3kg. If the spring is compressed downwards by a length of 0.02m and then released, calculate the height to which the mass is projected
  2. 2 m
  3. 8 m
  4. 1 m
  5. 4 m
  1. A hose of cross-sectional area 0.5m2 is used to discharge water from a water thank at a velocity of 60ms-1 in 20s into a container. If the container is filled completely, the volume of the container is
  2. 600 m3
  3. 6 000 m3
  4. 240 m3
  5. 2 400 m3
  1. A force of 100N is used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked.
  2. 100ms-1
  3. 32ms-1
  4. 50ms-1
  5. 64ms-1
  1. The inner diameter of a test tube can be measured accurately using a
  2. micrometer screw guage
  3. pair of dividers
  4. metre rule
  5. pair of vernier calipers

22 Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

  1. 1 : 4
  2. 2 : 1
  3. 2 : 3
  4. 2 : 5
  1. Particles of mass 10-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is
  2. 2 N
  3. 20 N
  4. 200 N
  5. 400 N
  1. a lead bullet of mass 0.05kg is fired with a velocity of 200ms-1 into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is
  2. 50 J
  3. 100 J
  4. 150 J
  5. 200 J
  6. A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

(take g = 10ms-2)

  1. 5 J
  2. 10 J
  3. 15 J
  4. 20 J
  1. A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is
  2. 1 . 25 x 104 W
  3. 2 . 50 x 104 W
  4. 1 . 25 x 106W
  5. 2 . 50 x 106 W
  1. When the brakes in a car are applied, the frictional force force on the tyres is
  2. is a disadvantage because it is in the direction of the motion of the car
  3. is a disadvantage because it is in the opposite direction of the motion of the car
  4. is an advantage because it is in the direction of the motion of the car
  5. is an advantage because it is in the opposite direction of the motion of the car
  1. If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young’s modulus of the wire is
  2. 5 . 0 x 104 Nm-2
  3. 5 . 0 x 105 Nm-2
  4. 2 . 0 x 108 Nm-2
  5. 2 . 0 x 109 Nm-2

29 A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

  1. 5/3
  2. 4/3
  3. 3/4
  4. 7/10

30 When temperature of a liquid increases, its surface tension

  1. Decreases
  2. Increases
  3. Remain Constant
  4. Increases then decreases

31 A gas at a volume of V0 in a container at pressure P0 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

  1. P0/5
  2. 4P0/5
  3. P0
  4. 5P0

32 A piece of substance of specific head capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms-2]

  1. 2/9°C
  2. 4/9°C
  3. 9/4°C
  4. 9/2°C

33 I. A liquid boils when its saturated vapour pressure is equal to the external pressure

  1. Dissolved substances in pure water lead to increase in the boiling point.

III. When the external pressure is increased, the boiling point increases.

  1. Dissolved substances in pure water decrease the boiling point.

Which combination of the above are peculiarities of the boiling point of a liquid?

  1. I, II and III
  2. I, II, III and IV
  3. I, II and IV
  4. II, III and IV

34 The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is

  1. 3.0 x 102Km-1
  2. 3.0 x 103Km-1
  3. 5.0 x 103Km-1
  4. 3.0 x 104Km-1

35 Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;

Specific heat capacity of copper = 400JKg-1K-1

Latent heat of fusion of ice = 3.3 x 105JKg-1

  1. 8/33kg
  2. 33/80kg
  3. 80/33kg
  4. 33/8kg
  5. The equation of a wave travelling along the positive x-direction is given by;

y = 0.25 x 10-3 sin (500t – 0.025x).

Determine the angular frequency of the wave motion.

  1. 0.25 x 10-3rad s-1
  2. 0.25 x 10-1rad s-1
  3. 5.00 x 102rad s-1
  4. 2.50 x 103rad s-1

37 If a sound wave goes from a cold air region to a hot air region, its wavelength will

  1. increase
  2. decrease
  3. decrease then increase
  4. remain constant

38 The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40hz and 180Hz?

  1. 4
  2. 3
  3. 2
  4. 1
  1. A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is
  2. 3m
  3. 5m
  4. 6m
  5. 10m

40 The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

  1. concave mirror of focal length 5cm
  2. concave mirror of focal length 10cm
  3. convex mirror of focal length 5cm
  4. convex mirror of focal length 20cm

41 The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is

  1. 0.33
  2. 0.50
  3. 0.67
  4. 0.75

42  An astronomical telescope is said to be in normal adjustment when the

  1. eye is accommodated
  2. focal length of objective lens is longer than that of eye piece
  3. final image is at the near point of eye
  4. final image is at infinity

43 Which of the following electromagnetic waves is least energetic?

  1. Infra-red rays
  2. X-rays
  3. Ultra-violet rays
  4. Gamma rays

44 Steel is more suitable for permanent magnet than iron because the former

  1. is easily demagnetized by shaing vigorously
  2. is an alloy of many metals
  3. is easily magnetized by alternating current through one cycle
  4. retains magnetism more than iron

45  Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

  1. 6.0V, 16Ω
  2. 6.0V, 1Ω
  3. 1.5V, 4Ω
  4. 1.5V, 1Ω

46  A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

  1. 2A
  2. 5A
  3. 10A
  4. 20A

47 A galvanometer has a resistance of 5Ω. By using a shunt wire of resistance 0.05Ω, the galvanometer could be converted to an ammeter capable of reading 2Amp. What is the current through the galvanometer?

  1. 2mA
  2. 10mA
  3. 20mA
  4. 25mA

48  In fleming’s right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the

  1. motion, the field and the induced current
  2. induced current, the motion and the field
  3. field, the induced current and the motion
  4. induced current, the field and the motion

49 At what frequency would a 10H inductor have a reactance of 2000Ω?

  1. π/200Hz
  2. π/100Hz
  3. 100/πHz
  4. 100πHz

50  The core of an efficient transformer should consist of laminated pieces of metal in order to

  1. increase the heat produced by increasing the eddy current
  2. increase the heat produced by reducing the eddy current
  3. reduce the heat produced by increasing the eddy current
  4. reduce the heat produced by reducing the eddy current
  1. A wave disturbance traveling in air enters a medium in which its velocity is less than that in air. Which of the following statements is true about the wave in the medium?
  2. A) both the frequency of the wave and the wavelength are decreased
  3. B) the frequency of the wave is decreased while the wavelength is increased
  4. C) the frequency of wave is unaltered while the wavelength is decreased
  5. D) the frequency of the wave is decreased while the wavelength is unaltered
  1. Shadows and eclipses result from the
  2. A) refraction of light
  3. B) rectilinear propagation of light
  4. C) detraction of light
  5. D) reflection of light
  1. An object which is 3cm high is placed vertically 10cm in front of a concave mirror. If this object produces an image 40cm from the mirror, the height of the image is
  2. A) 0.75cm
  3. B) 4.00cm
  4. C) 8.00cm
  5. D) 12.00cm
  1. A boy looks at the image of an object in a plane mirror. He observes two images, a main bright one and the other faint. The observed images result from
  2. A) reflection only
  3. B) refraction only
  4. C) diffraction and interference
  5. D) reflection and refraction
  6. What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?
  7. A) 20cm
  8. B) 15cm
  9. C) 10cm
  10. D) 5cm
  11. For a short sighted person, light rays from a point on a very distant object is focused
  12. A) in front of the retina
  13. B) on the retina by a converging lens
  14. C) behind the retina by a diverging lens
  15. D) in front of the retina at a distance of 2f from the lens
  1. When light is incident on an object which is magenta in colour, which of the following colours would be absorbed?
  2. A) red and blue
  3. B) green only
  4. C) red and green
  5. D) red only
  1. In a resonance tube experiment, the effective of the air column for the first resonance is 20cm when set into vibration by a tuning fork of frequency 480Hz. Neglecting end effect the velocity of sound in air is
  2. A) 96ms$^{-1}$
  3. B) 255ms$^{-1}$
  4. C) 340ms$^{-1}$
  5. D) 384ms$^{-1}$
  6. An organ pipe closed at one end is 80cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340ms$^{-1}$
  7. A) 106Hz
  8. B) 213Hz
  9. C) 318Hz
  10. D) 425Hz
  11. An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?
  12. A) 10 cm
  13. B) 25 cm
  14. C) 16 cm
  15. D) 14 cm

RECOMMENDED:

WAEC Physics Essay Questions and Answers

1. What is Wave

b) Mention and explain the properties of waves

c)Explain the following Terms Associated With waves

i Period

ii Frequency

iii Amplitude

iv Velocity

v Wave lenth

Those were Our WAEC Physics Questions and Answers 2020/2021 to OBJ/ESSAY and there were all sourced from the right place and there is an alignment with the WAEC Physics Questions and Answers 2020/2021 to OBJ/ESSAY and that’s why we can say that the questions for this year’s WAEC physics exams is drawn from the previous year’s questions.

Well, that was all we can contribute to your WAEC  physics exams success. Hope this was helpful?

We also have this jamb question answers on all the subjects so Check below to get more WAEC 2020 questions and answers for other subjects.

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