NECO Physics Past Questions & Answers - Page 8

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36.

A sound wave from a ship is received 8.4s later. What is the depth of the sea? [Speed of sound in water 1500ms-1]

A.

0.179km

B.

0.357km

C.

3.150km

D.

6.300km

E.

12.600km

Correct answer is D

No explanation has been provided for this answer.

37.

A body accelerating will have a constant speed if it is

A.

falling from a height

B.

in equilibrium

C.

moving in a circular path

D.

moving in a straight line

E.

oscillating

Correct answer is C

No explanation has been provided for this answer.

38.

Which of the following statements about water is NOT correct?

A.

Pure water freezes at 0°C under normal pressure

B.

The volume of a given mass of water at 0° is less than its volume at 4°C

C.

Water boils at a definite temperature

D.

Water evaporates at all temperatures

E.

Water has its maximum density at 4°C

Correct answer is B

Water has its least volume and highest density at 4°C

39.

Which of the following cells does not require a dipolar for effective and efficient delivery of current?

A.

Daniel cell

B.

Dry Leclanche cell

C.

Nickel-iron accumulator

D.

Voltaic cell

E.

Wet Leclanche cell

Correct answer is C

No explanation has been provided for this answer.

40.

When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quart its e.m.f. The cell’s internal resistance in terms of R is

A.

\(\frac{R}{4}\)

B.

\(\frac{R}{3}\)

C.

\(\frac{R}{2}\)

D.

2\(\frac{R}{3}\)

E.

R

Correct answer is A

No explanation has been provided for this answer.