WAEC Past Questions and Answers - Page 4096

20,476.

An iron rod of length 50m and at a temperature of 60oC is heated to 70oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10-5K-1)

A.

50.006m

B.

50.060m

C.

51.600m

D.

51.200m

Correct answer is A

No explanation has been provided for this answer.

20,477.

The inability of some individuals to perceive the taste of some substances is an example of

A.

individual adaptation

B.

physiological variation

C.

morphological variation

D.

morphological adaptation

E.

physical variation

Correct answer is B

No explanation has been provided for this answer.

20,478.

The spaces between neurons through which impulses cross by chemical reaction are called

A.

axons

B.

ganglia

C.

synapses

D.

dendrites

E.

pia mater

Correct answer is C

No explanation has been provided for this answer.

20,479.

Which of the following fixes atmospheric nitrogen?

A.

Rhizobium

B.

Nitrosomonas

C.

Nitrobacter

D.

Putrefying bacteria

E.

Denitrifying bacteria

Correct answer is A

No explanation has been provided for this answer.

20,480.

Group instinct or social behaviour is not displayed in

A.

soldier ants

B.

bees

C.

chickens

D.

weaver birds

E.

termites

Correct answer is C

No explanation has been provided for this answer.