## Physics 2018 Past Question | WAEC

Study the following past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q.                                     $$[G= 6.67 \times 10^{-11} Nm^{2}kg^{-2}]$$

• A. $$1.11\times 10^{-7} N$$ towards P
• B. $$1.11\times 10^{-7} N$$ towards Q
• C. $$9.26\times 10^{-8} N$$ towards P
• D. $$9.26\times 10^{-8} N$$ towards Q

32. The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

• A. 50V
• B. 100V
• C. 200V
• D. 400V

33. In the diagram illustrated a block of mass M is at rest on a plane inclined at an angle $\theta$ to the horizontal. As θ$\theta$ increases, the velocity ratio of the plane

• A. increases
• B. decreases
• C. remain 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

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

• A. 250ms1
• B. 625ms1
• C. 1200ms1
• D. 1500ms1

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

• A. 4
• B. 3 1/2
• C. 2 1/2
• D. 2

37. A resistor with fixed resistance value is called a

• A. resistance box
• B. standard resistor
• C. shunt resistor
• D. multiplier resistor

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

• 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 P, Q and R respectively are:

• A. live, neutral and earth
• B. neutral, 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 to 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

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