2020 WAEC (WASSCE) Biology Past Questions

Consider the following equation; Cr2O7(aq)2- + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(I). The oxidation number of chromium changes from

1. A.-2 to + 3✓ Correct
2. B.- 2 to + 6
3. C.+ 6 to + 3
4. D.+ 7 to + 6

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences: While he was in prison he had.........time to read a lot of books.

1. A.ample
2. B.real
3. C.few✓ Correct
4. D.most

From the four options lettered A to D, choose the word that is the most suitable to fill the number 89 in the passage below.

1. A.attainment
2. B.creation
3. C.enforcement
4. D.evolution✓ Correct

In the following sentence, there is an underlined word and one gap. From the list of words lettered A to D, choose the one that is most nearly opposite in meaning to the underlined word and that will at the same time, correctly fill the gap in the sentence.  We all know that Bola is insolent whereas Ade is ________

1. A.cowardly✓ Correct
2. B.respectful
3. C.humble
4. D.modest

A battery of e.m.f 3.0V is connected across a potentiometer wire AB of length 10$\Omega m^{-1}$ as illustrated in the diagram above. If the jockey J makes contact at the 30cm mark, determine the resistance of length AJ and voltage across AJ.

1. A.3.0$\Omega$; 0.9V
2. B.3.0$\Omega$; 3.0V
3. C.3.3$\Omega$; 0.3V
4. D.3.3$\Omega$; 9.0V✓ Correct

From the words lettered A to D, choose the one that has the correct stress as the word given below. defensible

1. A.DE-fen-sible
2. B.de-FEN-si-ble
3. C.d-fen-SI-ble✓ Correct
4. D.den-fen-si-BLE

From the words lettered A to D, choose the one that has the correct stress. population

1. A.PO-pu-la-tion
2. B.po-PU-la-tion✓ Correct
3. C.po-pu-LA-tion
4. D.po-pu-la-TION

From the four options lettered A to D, choose the word that is the most suitable to fill the number 77 in the passage.

1. A.offer
2. B.lottery✓ Correct
3. C.action
4. D.sale

In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences. He didn't lose the fight because of his bravery but for his.............

1. A.ignorance
2. B.strength
3. C.cowardice
4. D.rashness✓ Correct

'Many hands make light work' illustrates the use of

1. A.zeugma
2. B.hyperbole
3. C.metonymy✓ Correct
4. D.synecdoche