2018 - WAEC Physics Past Questions and Answers (page 1)

1

The S.I unit for sound energy is

A

Hz

B

cd

C

dB

D

J

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2

The general definition of elastic modulus is

A

\(\frac{stress}{strain}\)

B

\(\frac{strain}{stress}\)

C

\(stress \times strain\)

D

\(\sqrt{\frac{stress}{strain}}\)

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3

The diagram above illustrates a simple barometer. Which distance measures the atmospheric pressure?

A

PQ

B

QR

C

RS

D

QS

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4

The property of a body to remain at rest or to continue in uniform motion in a straight line is called

A

momentum

B

Inertia

C

impulse

D

Energy

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5

During a training session, two footballers pass a ball repeatedly between each other. The 'to and fro' motion of the ball is not simple harmonic because the

I. Acceleration of the ball is not directed towards a fixed point

II. Restoring force is not directed towards the centre

III. Acceleration of the ball is not directly proportional to the displacement from a fixed point

Which of the statements above are correct?

A

I and III only

B

I and II only

C

II and III only

D

I, II and III

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6

A dam is able to hold a large quantity of water because its wall is

A

thickest at the top

B

thickest at the middle

C

thickest at the bottom

D

of the same thickness throughout

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7

A body of mass m moving around a circle of radius r with a uniform speed v experiences a centripetal force F. The work done by the centripetal force on it is

A

Fv

B

zero

C

Fmr

D

\(\frac{Fr}{m}\)

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8

A block is acted upon by TWO horizontal forces as illustrated in the diagram above. The block accelerates at 1.5\(ms^{-2}\). Calculate the mass of the block.

A

6kg

B

9kg

C

10kg

D

15kg

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9

Which of the following quantities are dimensionally independent?

I. Dielectric constant II. Momentum III. Efficiency IV. Refractive index

A

I and II

B

II, III and IV

C

I, II, III and IV

D

I, III and IV

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10

A body is projected with an initial velocity u at angle \(\theta\) to the horizontal. If \(R_{max}\) is the maximum range of the projectile, what does the relation \(\frac{u^{2}}{R_{max}}\) represent?

A

The vertical distance covered

B

Acceleration due to gravity

C

The horizontal distance covered

D

The acceleration of the body

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2018 - WAEC Physics Past Questions and Answers - page 1