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50 questions

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Question 21

waec 2018

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?

AThe vertical distance covered

BAcceleration due to gravity

CThe horizontal distance covered

DThe acceleration of the body

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Question 22

waec 2018

Which of the following quantities are dimensionally independent?

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

AI and II

BII, III and IV

CI, II, III and IV

DI, III and IV

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Question 23

waec 2018

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.

A6kg

B9kg

C10kg

D15kg

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Question 24

waec 2018

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

AFv

Bzero

CFmr

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

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Question 25

waec 2018

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

Athickest at the top

Bthickest at the middle

Cthickest at the bottom

Dof the same thickness throughout

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Question 26

waec 2018

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?

AI and III only

BI and II only

CII and III only

DI, II and III

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Question 27

waec 2018

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

Amomentum

BInertia

Cimpulse

DEnergy

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Question 28

waec 2018

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

APQ

BQR

CRS

DQS

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Question 29

waec 2018

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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Question 30

waec 2018

The S.I unit for sound energy is

AHz

Bcd

CdB

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