WAEC Past Questions and Answers - Page 4180

20,896.

The cell is a functional unit of living organisms because

A.

multicellular organisms are made up of cells

B.

all cells in a multicellular organism function as a single cell

C.

the function of a multicellular organism is the sum total of the functions of its constituent cells

D.

the function of a single cell is superior to that of the multicellular organism

E.

the cells of a multicelullar organism are structurally similar

Correct answer is A

No explanation has been provided for this answer.

20,897.

Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It

A.

suffers a displacement at the point of emergence

B.

emerges parallel to the incident ray

C.

is partly reflected at the point of incidence

D.

is deviated at the point of emergence

E.

is reflected in the block

Correct answer is A

No explanation has been provided for this answer.

20,898.

Images formed by a convex mirror are always

A.

inverted, real and diminished

B.

inverted, virtual and diminished

C.

erect, virtual and diminished

D.

erect, real and magnified

E.

erect, virtual and magnified

Correct answer is C

No explanation has been provided for this answer.

20,899.
20,900.

A metal of mass 1.5 kg was heated from 27oC to 47oC in 4 minutes by a boiling ring of 75 W rating. Calculate the specific heat capacity of the metal, (Neglect heat losses to the surrounding)

A.

2.5 X103J kg-10C-1

B.

6.0 X102J kg-10C-1

C.

2.5 x 102J kg-10C-1

D.

1.4 X102J kg-10C-1

E.

1.0 x 102J kg-10C-1

Correct answer is B

I.Vt = mcθ; C =
I.Vt/
=
75 x 4 x 60/1.5 x 20

= 6.0 X102J kg-10C-1