WAEC Past Questions and Answers - Page 4078

20,386.

A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10^-34Js; 1eV = 1.6 x 10^-19J)

A.

2.01 X 10¹⁵Hz

B.

1.06x10¹⁵Hz

C.

6.30 x 10¹⁴Hz

D.

1.60 x 10¹⁴Hz

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

20,387.

In the diagram above, |PQ| = |QR|, |PS| = |RS|, ∠PSR = 30^o and ∠PQR = 80^o. Find ∠SPQ.

A.

15^o

B.

25^o

C.

40^o

D.

50^o

E.

55^o

View answer & explanation

Correct answer is B

Join PR
QRP = QPR
= 180 - 80 = ¹⁰⁰/₂₀ = 50^o
SRP = SPR
= 180 - 30 = ¹⁵⁰/₂ = 75^o
∴ SPQ = SPR - QPR
= 75 - 50 = 25^o

20,388.

A dry indehiscent fruit containing one seed and possessing a hairy pappus is described as

A.

a nut

B.

a drupe

C.

a cypsela

D.

a follicle

E.

an achene

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

20,389.

I. All elements emit and absorb characteristic spectra.
II. Spectral analysis is an important method of identifying environmental pollutants.
III. The chemical composition of stars could be determined using spectral analysis.

Which of the statements above are correct?

A.

I, II and III

B.

II and III only

C.

I and III only

D.

I and II only

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

20,390.

The diagram above illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of highest frequency?

A.

V

B.

IV

C.

III

D.

II

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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