WAEC 2021 PHYSICS PAST QUESTION PAPER - ESSAY

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If yes, then your search ends here. Below is the West Senior School Certificate Examination (WASSCE) 2021 Physics past question paper for Private Candidate( GCE) – First Series.

PAPER TYPE – Paper 2 (ESSAY)

TOTAL MARK: 60marks

Time Allowed: 1 hour, 30minutes

INSTRUCTION: Answer eight questions in all. Five questions from Part I and Three questions from Part II

PART I [15 Marks] WAEC 2021 PHYSICS PAST QUESTION PAPER

(a) What is projectile motion? (b) Explain why a flying plane in not considered a projectile.
Explain each of the following terms as applied to elastic materials: (a) proportionality limit; (b) yield point
The work done in compressing a spring by 0.2cm is 200J. Calculate the stiffness of the spring.
(a) Explain the principle of transmitting signals in Fibre Optics. (b) State one advantage of optical fibre over copper cables.
(a) Name one material used in making a permanent magnet. (b) Give two reasons why iron is used in electromagnets.
(a) What is a p-n junction? (b( Differentiate between the production of a p-type semiconductor and the production of n-type semiconductor
Using dimensional analysis, show that work done is equal to energy expended.

PART II [45Marks] WAEC 2021 PHYSICS PAST QUESTION PAPER

Answer three questions from this part. All questions carry equal marks.

8. (a) (i) Define relative motion. (ii) Two cars A and B approach each other with velocities 120km/hr and 42 km/hr respectively. Determine the velocity of A relative to B. (b) A body of mass, m, is placed on a rough wooden board inclined at angle θ to the horizontal. Using a labeled diagram, show: (i) the forces acting on the body; (ii) that the coefficient of friction μ between the surfaces can be expressed as μ = tan θ, if the body is in equilibrium. (c) State two applications of a centrifuge. (d) A body of mass 17kg, attached to a string of length 3.4m is whirled round in vertical circle. If the tension in the string at the lowest point is 300N, calculate the speed of the body.
9. (a) (i) State advantages of the constant-volume gas thermometer over the liquid-in-glass thermometer. (ii) A resistance thermometer registers a resistance of 900Ω at steam point and resistance of 720Ω at 48⁰C. Determine the resistance registered on the thermometer at ice point. (b) State three functions of the transparent glass cover used in solar panels. (c) (i) Explain land breeze and sea breeze in terms of specific heat capacities of the land and the sea. (ii) State two applications of the cooling effect of evaporation.
10. (a) (i) A transerve wave equation of wave travelling in the x-direction with displacement y is expressed as y = A sin ( wt + Φ ), where Φ is the phase diffrence and the other symbols have their usual meaning. Show that the equation can be expressed as y = A sin 2π/λ (vt + x). (ii) A wave motion is expressed by the equation y = 25 sin (4t – 3x), where x and y are in metres. Determine the: (I) wavelength of the wave (II) frequency of the wave. (b) State three applications of ultrasound. (c) (i) Differentiate between harmonics and overtones. (ii) A sonometer wire of length 100cm and mass 2g is under a tension 100N. Determine the frequency of the second overtone if the wire is set into vibrations.
11. (a) (i) State two differences between gravitation field and electric field. (ii) List three methods by which electric charges could be produced. (b) Two capacitors of capacitances 3 μF and 4μF are connected in parallel and the combination connected in series with a 2μF capacitor. The p.d. across the 3μF capacitor is 12V, when the arrangement is connected to a source of emf, E. (i) Draw the circuit diagram of the arrangement. (i) Calculate the: (I) charge on the 2μF capacitor; (II) p.d across the 2μF capacitor; (III) value of E; (IV) energy stored in the circuit. (c) Describe how a lead-acid accumulator could be charged.
12. (a) (i) State the difference between the production of X-rays and photoelectric effect. (ii) Differentiate between line spectrum and continuous spectrum. (b) A particle of mass 2.0 x 10^-4kg moves with a speed of 300m/s. Calculate the associated wavelength of the particle. [h = 6.6 x 10^-34Js] (c) (i) State the law of radioactive decay. (ii) The activity of a sample is 326 Bq. If the original number of atoms in the sample is 1200, determine the: (I) decay constant; (II) half-life. (d) The mass defect in a nuclear reaction is 0.5213u. Calculate the binding energy. [1u = 931Mev; 1eV = 1.6 x 10-¹⁹J]

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