2020 JAMB Biology Past Questions

Choose the word that best completes the following sentence. I really like working in that office: I find the — very friendly

1. A.condition
2. B.atmosphere✓ Correct
3. C.air
4. D.situation

Ada na-ede

1. A.A. egwu✓ Correct
2. B.B. akwa
3. C.C. ụkwẹ
4. D.D. nri

Iron can be protected from corrosion by coating the surface with?

1. A.gold
2. B.silver
3. C.copper
4. D.zinc✓ Correct

An organic compound contains 53.1% Carbon, 6.2% Hydrogen, 12.4% Nitrogen, and 28.3% Oxygen by mass. What is the molecular formula of the compound if its vapour density is 56.5?   [ C =12, H = 1, N = 14, O = 16].

1. A.C$_5$H$_7$NO$_2$
2. B.C$_5$H$_6$NO$_2$
3. C.C$_3$H$_6$NO$_2$✓ Correct
4. D.C$_3$H$_7$NO$_2$

The importance of sodium aluminate (III) in the treatment of water is to

1. A.cause coagulation
2. B.neutralize acidity
3. C.prevent goitre and tooth decay
4. D.kill germs✓ Correct

In the industrial production of H2 from water gas the CO2 produced along with the H2 is removed by

1. A.washing under pressure
2. B.drying over phosphorus (V) oxide✓ Correct
3. C.passing the mixture to the limewater
4. D.using ammonical copper (I) chlorine

Which of the following can cause shrinkage of living cells?

1. A.Hypotonic solution
2. B.Isotonic solution✓ Correct
3. C.Deionized water
4. D.Hypertonic solution

Which of the following does not assist in detecting drug addict?

1. A.A. Neglect of appearance
2. B.B. possession of drugs✓ Correct
3. C.C. Spirit of sportsmanship
4. D.D. Stealing and borrowing of money

For this question, choose the option opposite in meaning to the word or phrase in italics The idea makes me cringe

1. A.quiver
2. B.tremble✓ Correct
3. C.resolute
4. D.writhe

Written constitutions are always

1. A.A. unwritten✓ Correct
2. B.B. rigid
3. C.C. pliable
4. D.D. flexible