NECO Physics Past Questions & Answers - Page 26

126.

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.

127.

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.

128.

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.

129.

Calculate the wavelength of light travelling with a speed of 3 × 108ms-1 and a frequency of 6.2 × 1014Hz.

A.

4.8 × 10-8m

B.

4.8 × 10-7m

C.

4.8 × 10-6m

D.

4.8 × 10-5m

E.

4.8 × 10-4m

Correct answer is B

No explanation has been provided for this answer.

130.

A surface in the path of an advancing wave on which all the particles are in the same state of disturbance is called a

A.

crest

B.

cycle

C.

pulse

D.

trough

E.

wave front

Correct answer is E

No explanation has been provided for this answer.