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57 questions

Question 1 of 17 57 total questions

Question 21

waec 1998

If the cubic expansivity of brass between 27^oC and 100^oC is 5.7 x 10^-5K^-1, What is its linear expansivity?

A2.85 x 10^-5K^-1

B1.90 x 10^-5K^-1

C1.86 x 10^-5K^-1

D1.70 x 10^-5K^-1

E1.63 x 10^-5K^-1

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Question 22

waec 1998

How much heat is emitted when a body of mass 200g cools from 37^oC to 31^oC? (specific heat capacity of the body = 0.4Jg^-1K^-1,)

A4800J

B1200J

C480J

D202J

E80J

View Explanation & Discuss

Question 23

waec 1998

The average kinetic energy of the molecules of a perfect gas is directly proportional to the

Apressure exerted by the gas

Bvolume of the gas molecule

Ckelvin temperature of the gas

Dvolume of the gas container

Ecelcius temperature of the gas

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Question 24

waec 1998

A piece of brass of mass 170kg has its temperature raised from 0ºC to 30ºC. Calculate its increase in volume, given the density of brass at 0 °C as 8.5 x 103kgm\(^3\) and its cubic expansivity as 5.7 x 10\(^{-5}\)k\(^{-1}\)

A3.4 x 10^-4m³

B4.3 x 10^-5m³

C3.4 x 10^-5m³

D3.4 x 10^-3m³

E3.4 x 10^-2m³

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Question 25

waec 1998

The lower and upper fixed points of a mecury-in-glass thermometer are marked Y and 180mm respectively. On a particular the mecury meniscus in the thermometer rises to 45mm. If the corresponding reading on a scale is 10o, calculate the value of Y.

A4mm

B18mm

C30mm

D135mm

E450mm

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Question 26

waec 1998

An object is heated from 30ºC to 57ºC. The increases in its temperature on the Kelvin scale is

A17k

B27k

C81k

D246k

E300k

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Question 27

waec 1998

A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m-1 and rebounds with the same speed. Determine the impulse experienced by the ball

A20.0kgm^-1

B5.0kgm^-1

C1.3kgm^-1

D0.0kgm^-1

E10.0kgm^-1

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Question 28

waec 1998

The earth is not a perfect sphere because its equatorial axis is longer than the polar axis. where on the earth's surface would an object have its greatest weight?

Ahalf way between the equator and the north pole

Bnear the equator

Chalf way between the equator and the south pole

Dat either pole

Eat the equator

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Question 29

waec 1998

An object is protected with a velocity of 100m^-1 at an angle of 60^o to the vertical. Calculate the time taken by the object to reach the highest point (Take g as 10ms^-2

A5.0s

B8.7s

C10.0s

D17.3s

E20.0s

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Question 30

waec 1998

a pilot records the atmospheric pressure outside his plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg with his barometer. Assuming that the density of air is constant, calculate the height of the plane above the ground. (take the relative densities of air and mecury as 0.00136 and 13.6 respectively)

A120m

B138m

C274m

D1200m

E120,000m

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Question 31

waec 1998

I the box is pulled from P to Q, which of the following expresses the velocity ratio of the inclined plane?

APR/PQ

BOR/PQ

COR/PR

DPQ/PR

EPQ/QR

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Question 32

waec 1998

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

Asin\(\alpha\)

Bcos\(\alpha\)

Ctan\(\alpha\)

Dsec\(\alpha\)

Ecot\(\alpha\)

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Question 33

waec 1998

As the end Q of the plank is raised, the component of W, normal to plank, will

Aincrease

Bdecrease

Cremain the same

Dbe slightly greater than W

Ebe independent of w

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Question 34

waec 1998

A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed. Calculate the relative density of the liquid

A1.43

B1.33

C1.00

D0.83

E0.75

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Question 35

waec 1998

The term torque means

Athe moment

Bthe resultant of several forces acting on a body in equilibrum

Ctwo equal and oposite forces whose lines of action do not coincide

Dtwo coplaner forces at right angles to each other

Ethe equilibrant of two concurrent forces

View Explanation & Discuss

Question 36

waec 1998

A piece of stone attached to one end pf string is whirled round in a horizontal circle. When the string is suddenly cut, the stone will

Amove towards te centre of the circle

Bstop moving immediately

Cmove along a circular path of smaller radius

Dfly off in a direction tangential to the circular path

Eacquire greater centripetal force

View Explanation & Discuss

Question 37

waec 1998

which of the following pairs of physical quantities comprises vectors?

Acapacitance and inductance

Bforce ratio and velocity ratio

Cfriction and momentum

Denergy and power

Eelectric field potential and electric field intensity

View Explanation & Discuss

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