NECO Physics Past Questions & Answers - Page 24

117.

The resultant of two forces P and Q is least when the angle between them is

A.

B.

45°

C.

60°

D.

90°

E.

180°

Correct answer is E

No explanation has been provided for this answer.

118.

If the distance between the plates of a parallel plate capacitor is decreased, its capacitance

A.

becomes zero

B.

decreases

C.

increases

D.

is halved

E.

remains the same

Correct answer is C

No explanation has been provided for this answer.

119.

A radioactive isotope has a half-life of 8 days. What fraction of the atoms will remain after 72 days?

A.

9.766 × 10-4

B.

1.736 ×10-3

C.

1.953 ×10-3

D.

3.472 × 10-3

E.

3.906 x 10-3

Correct answer is C

No explanation has been provided for this answer.

120.

Which of the following is used as a depolarizer in a Denial cell?

A.

Ammonium chloride

B.

Copper (II) tetra Oxo sulphate (VI) solution

C.

Manganese (IV) oxide

D.

Tetraoxosulphate (VI) acid

E.

Water

Correct answer is B

No explanation has been provided for this answer.