NECO Physics Past Questions & Answers - Page 26

126.

In which of the following are crystalline structures observable?

I. Gas
II. Liquid
III. Solid

A.

I only

B.

II only

C.

III only

D.

I and III only

E.

II and III only

Correct answer is C

No explanation has been provided for this answer.

127.

The rate of diffusion of gases increases with increase(s) in

I. density
II. temperature
III, mass. Which is/are correct?

A.

I only

B.

II only

C.

I and II only

D.

II and III only

E.

I, II and III

Correct answer is B

No explanation has been provided for this answer.

128.

A stone is dropped from the top of a tower of height 11 .25m. Calculate the time it will take to reach the ground. [g = 10ms-2]

A.

1.00s

B.

1.50s

C.

2.25s

D.

2.50s

E.

3.00s

Correct answer is B

No explanation has been provided for this answer.

129.

A body has masses of 0.013kg and 0.012 kg in oil and water respectively. If the relative density of oil is 0.875 calculate the mass of the body.

A.

0.02 kg

B.

0.03kg

C.

0.04kg

D.

0.05kg

E.

0.06kg

Correct answer is A

No explanation has been provided for this answer.

130.

What is the uncertainty in the measurement of time, if the uncertainty in measuring the energy of an electron of mass 10-30 kg is 2.45 × 10-19J? h = 6.6 × 10-34

A.

1.35 ×10-15s

B.

2.69 × 10-15s

C.

4.15 × 10-15s

D.

9.05 × 10-15s

E.

1.62 × 10-14s

Correct answer is B

No explanation has been provided for this answer.