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89 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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89 questions

Question 1 of 20 89 total questions

Question 11

waec 2012

An object is placed at a point X between the focal point F and the optical centre C of a diverging lens. If F is the focal point on the other side of the lens, the image of the object is formed between

AF and X

BX and C

CC and F

DF and 2F

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Question 12

waec 2012

A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is \(\frac{4}{3}\) and air to glass is \(\frac{3}{2}\), calculate the refractive index of glass relative to water

A0.50

B0.67

C0.75

D1.13

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Question 13

waec 2012

An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.

A2.5 cm

B3.0cm

C5.0cm

D25.0cm

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Question 14

waec 2012

Which of the following properties of waves is exclusive to transverse waves?

Areflection

Binterference

Cdiffraction

Dpolarization

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Question 15

waec 2012

When two waves are superimposed on each other, the following occurrences are possible, except

Anodal lins

Banti nodal lines

Cstationary waves

Ddispersion

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Question 16

waec 2012

Which of the following factors decreases the rate of evaporation of a liquid?

Aincrease in pressure over the liquid

Blowering the boiling point

Cdecreasing in humidity

Dwind

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Question 17

waec 2012

A piece of copper of mass 20g at a temperature of 110°C was dropped into a mixture of ice and water at 0°C. If the final steady temperature of the mixture is 0°C . Calculate the amount of ice that melted [Specific heat capacity of copper = 0.4 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 330Jg\(^{-1}\)]

A0.37g

B0.60g

C2.40g

D2.70g

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Question 18

waec 2012

In the formation of sea breeze. wind blows from

Asky to land

Bsea to sky

Cland to sea

Dsea to land

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Question 19

waec 2012

The thermopile is a device for detecting

Aradioactive radiations

Bradiant energy

Cx-rays

Dthe presence of electrons

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Question 20

waec 2012

A metal sheet of area 100cm\(^2\) was heated through 70°C. Calculate its new area if the linear expansivity of the metal is 0.000017K\(^{-1}\).

A100.06 cm²

B100.12cm²

C100.24cm²

D100.36cm²

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Question 21

waec 2012

A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts

A250.0s

B25.0s

C2.5s

D0.5s

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Question 22

waec 2012

The S.I unit of heat is

Ajoule

Bkelvin

Cwatt

Dampere

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Question 23

waec 2012

A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving

Aupward at uniform speed

Bupward with uniform acceleration

Cdownward with uniform speed

Ddownward with uniform acceleration

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Question 24

waec 2012

A resultant force of magnitude 15N acts on a body of mass 250g. Calculate the magnitude of the acceleration

A0.06 ms^-2

B3.75ms^-2

C16.67ms^-2

D60.00ms^-2

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Question 25

waec 2012

The tendency for a stationary body to continue to remain at rest when a force is applied to it is known as

Afriction

Bimpulse

Cinertia

Dmomentum

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Question 26

waec 2012

A simple pendulum makes 50 oscillations in one minute. Determine its period of oscillation

A0.02s

B0.83s

C1.20s

D50.00s

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Question 27

waec 2012

When a body is slightly tilted, it is found that its centre of gravity is slightly raised. What is the state of equilibrium of the body?

Aunstable

Bstable

Cneutral

Dcannot be determined

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Question 28

waec 2012

An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms-2, ignore air resistance)

A20m

B40m

C80m

D160m

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Question 29

waec 2012

The time of flight for a projectile motion is given by the expression

A\(\frac{U sin \theta}{g}\)

B\(\frac{U sin \theta}{2g}\)

C\(\frac{2U sin \theta}{g}\)

D\(\frac{U sin 2\theta}{g}\)

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Question 30

waec 2012

A bird flies at 10ms\(^{-1}\) for 3s, 15ms\(^{-1}\) for 3s and 20 ms\(^{-1}\) for 4s. Calculate the bird's average speed

A4.5 ms^-1

B15.0 ms^-1

C15.5 ms^-1

D51.7 ms^-1

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