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THEORY QUESTIONS
WAEC SYLLABUS

WASSCE 2018

Objectives



1. The S.I unit if sound energy is?

A. Hz

B. B

C. Db

D. J.


2. The general definition of elastic modulus is.

A. Stress/Strain

B. (Stain)/Stress

C. stress ×strain

D. √(stress ×strain)





3. The diagram above illustrates a simple barometer, which distance measure the atmospheric pressure?

A. PQ

B. QR

C. RS

D. QS


4. The property of a body to remain at rest or to continue in a uniform motion, in a straight line is called.

A. Momentum.

B. Inertia

C. Impulse

D. Energy.


5. During a training session, two footballers pass a ball repeatedly between each other. The ‘to and fro motion of the ball is not simple harmonic because the Acceleration of the ball is not directed towards a fixed-point Restoring force is not directed towards the center Acceleration if the ball is not directly proportional to the displacement from fixed point. Which of the statements above are correct?”

A. I and II only

B. I and II only

C. II and II only

D. I, II, and III


ANSWERS

6. Adam is able to hold a large quantity of water because it s wall is.

A. Thickest at the top.

B. thickest at the middle

C. thickest at the bottom

D. of the same thickness throughout


7. A body of mass M moving round a circle of radius R with a uniform speed V experiences a centripetal force F. The work done by the centripetal force on it is.

A. Fv

B. Zero

C. Fmr

D. Fr/m





8. A block is acted upon by two horizontal forces as illustrate in the diagram above. The block accelerated at 1.5ms-—2, calculate the mass of the block.

A. 5kg

B. 9kg

C. 10kg

D. 15kg


9. Which of the following quantities are dimensionally independent?

I. Dielectric

II. Momentum constant

III. Efficiency

IV. Refraction index

A. I and II

B. I, II, and IV

C. II, III and IV

D. I, III and IV


10. A body is projected with an initial velocity U at angle θ to the horizontal. If Rmas. Is the maximum range of the projectile, what does the relation represent?

A. The vertical distance covered

B. Acceleration due o gravity

C. The horizontal distance covered

D. The acceleration of the body.


ANSWERS

11. An object at rest is said to possess.

A. Potential energy

B. Kinetic energy

C. Chemical energy

D. electrical energy


12. According to Newton’s law of cooling, the heat energy lost per unit area of a body depends on the

I. Surface area.

II. Nature of the surface

III. Temperature of the surface.

IV. Excess temperature over the surroundings

A. I and II only.

B. II and V only

C. I, II and III

D. I, II and IV


13. The graph of density against temperature for water is correctly illustrated by.





14. A football is kicked at an angle of 450 to the horizontal over a defense line up with a velocity of 15ms-1. Calculate the magnitude of horizontal velocity of the at its highest point. (Neglect friction, gravity 10ms-—2).

A. 0.0 ms-2

B. 5.6 ms-1

C. 10.6 ms-1

D. 15.0 ms-1


15. The ice point on the absolute scale of temperature is.

A. 0K

B. 32K

C. 100K

D. 273K


ANSWERS

16. Which of the following factors does no increase the rate of evaporation of water in a lake?

A. Increase in the pressure of the atmosphere

B. Rise in the temperature

C. Increase in the surface area of the lake

D. Increases in the surface area of the lake


17. The bob of a simple pendulum take 8.0s to complete 10oscillations. Determine the frequency of oscillation of the bob.

A. 0.80 Hz

B. 1.25 Hz

C. 7.50 Hz

D. 8.00 Hz





18. The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.

A. 3.30C

B. 7.00C

C.13.00C

D. 30.00C


19. Frequency is measured in

A. Meter per second.

B. Second

C. Hertz

D. farad


20. Which of the following electromagnetic waves is most energetic?

A. Radio wave.

B. X-ray

C. Gamma rays

D. Ultra-violet Ray.


ANSWERS

21. Rainbow formation is a natural phenomenon illustrating that white light.

A. Split into three components after rainfall

B. Is dispersed by glass prisms

C. Split into its constituent color before rainfall

D. Is dispersed into its constituent colors by raindrops.





22. The lens illustrated above can best be described as a

A. Converging meniscus.

B. Plano-convex

C. diverging meniscus.

D. bio-convex


23.Two plane mirrors are inclined to each other such that an object placed between then has 11 images. Determine the angle of inclination.

A. 300

B. 450

C. 600

D. 900


24. The pitch of a note is not affected by.

A. Frequency.

B. tension in a vibrating string.

C. Mass of a vibrating string.

D. Amplitude of sound wave.


25. When two flat plate conductors are arranged in such a way that they posses equal and opposite charges separated by a dielectric, they form a/an.

A. Electroscope

B. Electrophorus

C. Capacitor

D. Cell


ANSWERS



26. Which electrical device does the diagram above illustrate?

A. a.c generator.

B. a.c motor.

C. a.c generator.

D. d.c motor


27. A simple barometer is constructed using a liquid Q1 of density 16.2g/cm3. Calculate the least length of the tube to be used to measure pressure of 1.5 atmospheres. (Density of mercury = 13.063, 1atmosphere = 76.0 cm of mercury).

A. 1358 mm

B. 957 mm

C. 760 mm

D. 638 mm





28. A bar AB is balanced horizontally on two knife edges as illustrated in the diagram above. Determine the weight of the bar.

A. 10.0 N

B. 20.0 N

C. 40.0 N

D. 50.0 N


29. To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed.

A. Between the focus and the lens

B. At the focus

C. Between the focus and e the length

D. Beyond twice the focal length.





30. The diagram above represents a transverse travelling wave. Which two points are 1080 out of phase?

A and E

B. B and D

C. C and F

D. D and H


ANSWERS

31. Two object P Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational acting on Q. (G= 6.67 10-1 2 -2).

A. 1.11 10-7 towards P.

B. 1.11 10-7 towards Q

C. 9.26 10-8 towards p

D. 9.26 10-8 towards Q


32. The primary of a transformer has 10 turns and its secondary has 20 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

A. 50 V

B. 100 V

C. 200 V

D. 400 V



The diagram above illustrates a waveform. Determine the number of wavelengths in it. 4 B. C. D. 2 A resistor with fixed resistance value is called a. Resistance box. B. Standard resistor. C. shunt. D. multiplier.


Which of the following statements is not an advantage of alkaline accumulators? The electrolyte does not need attention It can be recharged It has low internal resistance It has a much longer life than lead-acid accumulator.


The diagram above illustrates the wire connections to a three-pin plug. The wires PQ and R respectively are. Live, neutral and earth. Neural, earth and live Earth, live and neutral Earth, neutral and live.





33. In the diagram illustrated above, a block of mass M is at rest on a plane inclined at an angle to the horizontal as increases, the velocity ratio of the plane.

A. Increases.

B. Decreases.

C. Remains the same.

D. Decreases and later Increases.


34. When the speed of a car is halved, its kinetic energy is.

A. Doubled.

B. quartered.

C. halved.

D. quadrupled.


35. A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150 Hz. Calculate the speed of the wave produced.

A. 250 ms-1

B. 625 ms-1

C. 1200 ms-1

D. 1500 ms-1


ANSWERS



36. The diagram above illustrates a waveform. Determine the number of wavelengths in it.

A. 4

B. 6

C.

D. 2


37. A resistor with fixed resistance value is called a.

A. Resistance box.

B. Standard resistor.

C. shunt.

D. multiplier.


38. Which of the following statements is not an advantage of alkaline accumulators?

A. The electrolyte does not need attention

B. It can be recharged

C. It has low internal resistance

D. It has a much longer life than lead-acid accumulator.





39. The diagram above illustrates the wire connections to a three-pin plug. The wires PQ and R respectively are.

A. Live, neutral and earth.

B. Neural, earth and live

C. Earth, live and neutral

D. Earth, neutral and live.


40. Which of the following statements about parallel plate capacitors is/are correct?

i. Capacitance of the capacitor is inversely proportional of the distance between the plates.

ii. Capacitors can filter a.c signals from d.c

iii. Capacitors can store charges.

A. I only

B. I and II only

C. II and III only

D. I, II and III.


ANSWERS



41. A circuit contains three ammeters A1, A2 and A3 with readings of A2 and A2 shown as inclined in the diagram above. Determine the readings of A1

A. 2 A

B. 3 A

C. 65 A

D. 4 A


42. Which of the following statements about magnetic lines of force is not correct? They.

A. Pass through even non-magnetic materials

B. Run from the north pole to the south pole

C. Are in a state of tension and tend to be shorted

D. Intersect one another.


43. In which of the following activities is an induction coil not useful?

A. Investigation of high voltages.

B. Study of electric discharge.

C. Operation of X-ray tubes

D. A.c power transmission.


44. In series R-L-C circuit, R = 10Ω, X0 = 4F and XL = 9. The impedance of the circuit is.

A. 4.1Ω

B. 5.0 Ω

C. 10.8 Ω

D. 11.2 Ω


45. A student uses two compass needles to investigate the magnetic field around a bar magnet. Which of the following diagrams show the correct directions of the needles?




ANSWERS

46. Which of the following particles may be emitted in a process of natural radioactivity? A. α – Particles and β- particles.

B. α-particles and X-rays

C. β- particles and X-rays

D. y− particles and X –rays


47. In which of the following situations is photoelectric effect employed? Automatic devices for switching on light at dusk Automatic doors in department store Automatic devices for switching on air conditioners Automatic voltage stabilization.

A. I, II, and IV only

B. I, III, and IV only

C. III and IV only

D. I and II only


48. Which of the following radiations has the longest wavelength?

A. Gamma ray.

B. Radio wave.

C. Infrared ray.

D. X-ray


49. F the following fields is radioisotopes not used

A. Medicine.

B. Oil industry.

C. Agriculture.

D. Weather forecast.


49. A nuclide is represented by. Determine its neutron proton ratio.

A.0.5

B. 0.8

C. 1.2

D. 1.5


ANSWERS

WASSCE 2018 PHYSICS OBJECTIVE TEST

ANSWERS

​1.D 2.A 3.A 4.B 5.C 6. C 7.B 8.A 9.D 10.B 11.A 12.C 13.A 14.C 15.D 16.A 17.B 18.D 19.C 20.C 21.B 22.B 23.A 24.D 25.C 26.C 27.C 28.C 29.A 30.B 31.C 32.C 33.D 34.D 35.C 36.C 37.B 38.A 39.B 40.D 41.B 42.D 43.D 44.D 45.C 46.A 47.B 48.B 49.B 50.C


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