We have uploaded the full 2020 General Science WASSCE past questions for candidates who would want to give it a try. The questions were uploaded to help provide students with useful materials they can use to prepare for their upcoming WASSCE.
We suggest that candidates attempt to solve the questions under examination conditions or use the questions as discussion materials for group studies.
A group of students can also use it for group quizzes whiles the section B questions can be shared among students to solve and then come to group meetings to share their answers.
2020 General Science WASSCE past questions
1. Ozone layer depletion results in
a. Melting of the ice at the poles. b. Increase in number of storms. c. Skin cancer in humans. d. Loss of productive farmland
2.Which of the following factors can affect the boiling and freezing points of water?
a. Surface tension. b. Adhesive force. c. Impurities. d. Density
3. Purple leaf colouration is a symptom of the deficiency in. a. Magnesium. b. Nitrogen. c. Phosphorus d. Potassium
4.Which of the following diseases in human is caused by bacteria? a. Hepatitis. b. Herps c. Chlamydia d. Prostrate
5. The part of the human ear responsible for amplification of sound is
a. cochlea. b. ossicles. c. sacculus. d. utriculus
6. The general formula of alkyne is. a. CñH2n+2. b. CnH2n. c. CnH2n-2. d. CnHn
7. Which of the following bones is present in the forelimb of man? a. Femur. b. Radius. c. Ribs. d. Sternum
8. Materials included in the ration for egg shell are calcium and. a. Magnesium. b. Nitrogen c. Phosphorus. d. Potassium
9. Carrot is a good source of which of the following vitamins? a. Vitamin A. b. Vitamin B complex. c. Vitamin C d. Vitamin D
10.The major reason why relative atomic mass of some elements is not a whole number is the existence of. a. Isomerism. b. Allotropy c. Isotopy d. Isotonism.
11. Which energy transformation occurs in a light emitting diode?
a. Light energy to chemical energy. b. Chemical energy to heat energy. c. Electrical energy to heat energy. d. Electrical energy to light energy
12. Which of the following characteristics are associated with local breed of fowl. I. Resistance to diseases. Ii. High foraging ability Iii. Subceptible to adverse weather conditions.
a. I and Ii only b. I and lll only c. Ii and III only. d. I, II and I II only
13. Temporary hardness of water is removed by heating because
a. It is caused by insoluble salts b. The salt causing the harness become soluble c. Calcium trioxocarbonate (IV) in water is decomposed by heat. d. Calcium trioxocarbonate (IV) is produced
14. Example of continuous variation include
I. Weight II. Rhesus factor Iii. Sickle cell.
a. I only b. I and II only c. I and lll only. d. II and III only
15. The number of protons in an iron with a charge of +3 is 13. How many electrons are present in the neutral atom?
a.10 b.13 c. 16 d. 20
16. Metals are normally used as electrical wires because they are
a. Brittle. b. Ductile c. Elastic . d. Malleability
17. One advantage of male circumcision is that, it
a. Allows for easy penetration in the vagina b. Keeps the penis free from germs. c. Makes the man Sexually active. d makes the man Sexually inactive
18. Organic manures are preferred to inorganic manures because they are
a. Easy to apply b. readily to plants c. Relatively cheap. d. toxic to plants.
19.Calculate the number of moles in 5.85g of NaCl. (Na=23, Cl=35.5)
a. 0.01 b. 0.10. c. 1.00 d. 10.00
2020 General Science WASSCE past questions
20.The diagram below illustrates a ray of light incident on a plane mirror MM.
The value of @ is a. 40. b.50 c. 80 d. 100
21. A respiratory surface must have.
I. rich supply of blood capillaries II. Thin wall. Iii. Large surface are.
a. I only b. I and Ii only. c. Ii and III only. d. I, Ii and III only
22. In which of the following processes is plants nutrients in the soil loss through gravity
a. Capillary b. Erosion c. Evaporation d. Leaching
23. A body of mass 20kg falls from a height of 10m. If g=10m/s2, calculate the velocity of the body just before it touches the ground.
a. 10.0ms-1. b. 14.0ms-1 c. 20.0ms-1. d. 24.3ms-1
24. A solution of 250cm3HCl has a concentration of 2mol dm-3. Determine the number of moles of the acid.
a. 0.25moles b. 0.5.moles c. 1.00moles d. 1.50 moles
25. In which of the following blood vessels in the mammalian body would high levels of urea be found?
a. Hepatic artery b. Hepatic vein c. Pulmonary artery d.pulmonary vein
26. Land breeze occurs when.
a. Cool wind blows across the land during the day. b. Warm air rises up from the sea during the day c. Cool wind blows across the sea during the night b. Warm air rises up from the land during the day.
27. The following are characteristics of large scale industries except
a. Volumes of products turned out are large b. Many people are involved in it’s operation c. Capital investment is large d. Space of operation is limited
28. Muscles are mostly made up of
a. Proteins b. Starch c. Fiber d. Cellulose
29. Determine the volume of water required to change the conversation of 100cm2HCl from 0.5mol dm-3.
a. 100 cm3 b. 200 cm3 c. 400 cm3 d. 500 cm3
30. A Force moves a body through a distance of 15m in the direction of the force. If the work done by the force is 45.0J, determine the magnitude of the force.
a. 3.00N. b. 3.15N c. 6.00N d. 6.75 N
31. Which of the following statements are functions of soil air?
I. It is for respiration of plants roots. II. It is for respiration of plants fauna. III. It is for seed germination
a. I and II only. b. I and III only. c. II and III only. d. I, II and III only
32. Digestion of food is completed in the
a.small intestine. b large intestine. c. stomach. d. rectum
33. Transistors can be used as
I. Amplifiers. II. Switched. III. Temperature control
Which of the statements above is/are true? a. I only. b. III only. c. I and II only d. II and III only
34. Sedentary rocks are not resistant to weathering because, they
a. Are fromed from malten matter b. Formed from other rocks. c. Have lines of weakness between mineral aggregates. d. Have lines of weakness between strata
35. The reaction represented by the equation
RCOOH+R’OH=RCOOR’ + H2O is an example of
a. Esterification. b. Hydrolysis c. Neutralization. d. Oxidation
36. All the following crops require staking as a cultural practice except
a. Cowpea. b. cucumber. c. Tomato. d. Yam
37. Which of the following light will combine with red light to give white light?
a. Cyan. b. Green. c. Magenta. d. Yellow
38. Which of the following organelles is called the power house?
a. Golgi complex. b. Mitochondrion. c. Nucleus. d. Endoplasmic reticulum
39. The IUPAC name of the compound Mg(HCO3)2 is
a. Magnesium hydrogen trioxocarbonate (III) b. Magnesium hydrogen trioxocarbonate (IV). c. Magnesium hydrogen trioxocarbonate (V) d. Magnesium hydrogen trioxocarbonate (II)
40. Which of the following brooder house equipment confines day old chicks?
a. Feed trough. b. Chick guard. c. Hover. d. Litter
41. Symbiotic association in the root nodules occurs in
a. Cocoyam. b. Millet. c. Rice. d. Soya bean
42. The method of fertilizer application which is most labour intensive and time consuming is the
a. Broadcasting method. b. Drilling method. c. Foliar method. d. Ring method
43. An electric kettle rated1.5 kW operates at 200V. Determing the current passing through the kettle
a. 7.5 A. b. 133.3 A. c. 201.5 A. d. 300.0 A
44. The best way of storing yam tubers is
a. Burying them in the soil b. Keeping them in silos. c. Packing them on wooden platforms and in barns. d. Leaving them in the mounds for long periods.
45. Blood pressure is highest at
a. Pulmonary veins. b. Vena cava. c. Aorta d. Ventricular diastole
46. The main constituent of natural gas is
a. Ethane b. Helium. c. Methane. d. Nitrogen
47. The SI unit of light intensity is
a. Ampers. b. Candela c. Kilogram. d. Kelvin
48. A 250cm3 of 0.10 mol dm-3 of KOH is to be prepared. Calculate the mass of KOH required. (K=39, O= 16, H=1)
a. 1.0 g. b. 1.4 g. c. 7.0 g. d. 14.0 g
49. The male and female sex cells are collectively called
a.foetus. b. Gamete. c. Seed. d. Zygote
50. A characteristic of sound that differentiate the same note played on different instrument is
a. Frequency. b. Loudness. c. Pitch d. Quality.
2020 General Science WASSCE past questions
Section B.
3c.i. Distinguish between grafting and budding. Ii. Give three reasons for grafting and budding
d.i. State the principle of conservation of energy. Ii. State the energy transformations that occurs in each of the following devices:. @. A moving motor. B. A television set in operation
4a.i. What are secondary colours of light? Ii. Name the colour that results from the combination of each of the following pairs of colour of light;. @.red and green. B. Blue and green. Y. Red and blue
b.i.define the mole of a substance. Ii. Calculate the number of atoms in 18g of magnesium metal. (Mg=24, Avogadro number=6.023*10^23)
c.i. differentiate between bone and cartilage. Ii. Name three parts of human body where cartilage are found.
d.i. Explain the term deep litter system as used in poultry. Ii. Give three advantages of the deep litter system
5a. Explain how each of the following actions cause loss of soil nutrients;. i. Crop removal. ii. Continuous cropping. iii. Drainage
b.i. Give the reason for using each of the following devices in house hold wiring. @. Earthing. B. Stabilizer. Y. Fuse. Ii. Explain the behavior of a p-n junction diode when it is forward biased
c. State in which way each of the following factors is important in germination. i. water. Ii. Oxygen. Iii. Warmth. Iv. Sunlight
d. The table below shows a list of some chemical substances and the sources from which they are obtained but not correctly matched. In a tabular form, match each chemical substance with it’s correct source.
2020 General Science WASSCE past questions
6ai. What is meant by insanitary condition? Ii. State Three Way by which fire from electrical causes could be prevented
b. I. Give three effects of ecto- parasites on cattle. Ii. List four methods of controlling ecto- parasites of livestock.
c. Describe briefly how a standard solution of sodium hydroxide is prepared in the laboratory
d. I. Define displacement. Ii. A bird flies with a constant velocity of 100m/s for 10 minutes. Calculate the magnitude of its displacement
END OF ESSAY TEST
About The Author
