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# 2020 WAEC GCE/WASSCE PRIVATE SECOND SERIES PHYSICS OBJ ESSAY QUESTIONS AND ANSWERS

Physic-Ob!

Pls Trace It From Your Objective.

[If you see any options here pick it from your objective thank You.]

1. Gravitational force

2. Kinetic or potential

3. Violet

4. Tesla

5. Electric motor

6. Loudness

7. Electric field

8. Constriction

10. Good absorbers of radiant heat are good emitters

11. Decrease

12. Sound wave
13.

14 I and IV only

15. Diaphragm

16. Multiplier is high resistance change it to voltmeter

17. P is at the level with Q

18. 34.0⁰C

19. 0.02secs

20. 2.7*10kg/m³

21. Centripetal force applied in the wheel rotates it

22. Mg(sθ-μcosθ)

23.0.60Ω^-¹m^-¹

24. 800N

25. Both earth and Moon travel around the sun

26. 0.04secs

27. 0.25*10³Ω

28. 2uf

29. Radiate specific values of energy of electromagnetic waves

30. 6m/s²

31. 0.67

32. Axe

33. Mass of the conductor

34. 20ms^-¹

35. Charge ionises the sorrounding air

36. East west

37. 33.3A

38. 27.8m

39. 17N

40. 40g

41. Critical angle

42. Momentum

43. Mixture of gases

44. J

45. Jumps to a higher permissible energy level

46. Mass of the liquid

47. Spring balance

48. Argon

49. Images are formed behind the mirror always

50. Charles coloumb

===========================

##### PART I

=====================================

##### (6) Me = 9.1*10-³¹kg V = 1.0*10⁶m/s h = 6.6*10-³⁴Js λ = h/MeV λ = 6.6*10-³⁴/9.1*10-³¹*1.0*10⁶ = 0.7252*10-⁹ λ = 7.25*10-¹⁰m

=================================

##### (5b) (i) free electrons which have negative charges (ii) holes, which have positive charges

================================

##### (1) (i)They are use to find the unit of a given physical quantity in a given system of units. (ii)They are use to find dimensions of physical constants or coefficients. (iii)They are use to convert a physical quantity from one system of units to another.

====================================

##### TA = 33N

======================================

(11ai)

Reactance is the opposition of a circuit element to the flow of current due to that element’s inductance or capacitance.

(11aii)

Impedance is measure of the opposition to the flow of alternating current through a circuit

(11aiii)

(11bi)

Half-life, in radioactivity; is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive.

(11bii)

(11c)

Donor Impurity; is a dopant having 5 electrons in its valence shell when doped with a semiconductor to increase its conductivity is known as a donor impurity. In other words It holds the ability to donate an extra electron present in its valence shell to the neighbouring atom.

##### Initial length of iron rod = 133/84 of initial length of brass rod

Posted by on 21st November 2020.

Categories: Waec Gce

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