WAEC Past Questions and Answers - Page 4125

20,621.

A radioactive nuclide of mass 6.09 has a half-life of 8 days. Calculate the time during which 5.25g of the nuclide would have decayed

A.

1 day

B.

2 days

C.

8 days

D.

24 days

E.

42 days

Correct answer is D

No explanation has been provided for this answer.

20,624.

Which of the following is a wind instrument?

A.

Guitar

B.

Organ

C.

Violin

D.

Piano

E.

Harp

Correct answer is B

No explanation has been provided for this answer.

20,625.

Calculate the current in the 30 resistor in the diagram above if the battery is of negligible internal resistance

A.

0.3A

B.

0.4A

C.

1.0A

D.

1.5A

E.

2.5A

Correct answer is C

No explanation has been provided for this answer.