NECO Physics Past Questions & Answers - Page 4

16.

If the distance between the object and the pinhole of a pinhole camera is reduced by half the size of the image of the object

A.

Is quadrupled

B.

Is halved

C.

Remains the same

D.

Is double

Correct answer is D

No explanation has been provided for this answer.

17.

I.Chemical II.Sound III.Electricity

Which of the above forms of energy can directly be converted to light energy?

A.

I and II only

B.

II and III only

C.

I, II and III

D.

I and III only

Correct answer is D

No explanation has been provided for this answer.

18.

A satellite moves in a circular orbit of radius 4R round the earth. The acceleration of the satellite in terms of g is

A.

\(\frac{g}{16}\)

B.

\(\frac{g}{4}\)

C.

\(\frac{4}{g}\)

D.

\(\frac{16}{g}\)

Correct answer is A

\(\frac{g}{R^2}\) = \(\frac{g}{4^2}\) = \(\frac{g}{16}\)

19.

What happens to a water pool on a day when the humidity of the air is very low?

A.

Temperature decreases

B.

Slow evaporation

C.

Temperature increases

D.

Rapid evaporation

Correct answer is D

No explanation has been provided for this answer.

20.

A charged particle is moving in a uniform magnetic field. if the direction of motion of the charged particle is parallel to the magnetic field, the path of the charge will

A.

Be a straight line

B.

Curve inwards

C.

Be a parabola

D.

Curve outwards

Correct answer is A

No explanation has been provided for this answer.