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103 questions

Question 1 of 20 103 total questions

Question 21

waec 1993

A lens of focal length 15.0 cm forms an upright image four times the size of an object. Calculate the distance of the image from the lens

A11.3cm

B18.8 cm

C37.5cm

D45.0cm

E75.0cm

View Explanation & Discuss

Question 22

waec 1993

In the normal use of a simple microscope, a person sees an

Ainverted, virtual and magnified image

Berect, virtual and magnified image

Cerect, real and magnified image

Dinverted, real and magnified image

Einverted and real image the same size as the object.

View Explanation & Discuss

Question 23

waec 1993

The images formed by a diverging lens are always

Adiminished, virtual and inverted

Bdiminished inverted and real

Cdiminished, virtual and erect

Dmagnified, virtual and erect

Emagnified, real and inverted.

View Explanation & Discuss

Question 24

waec 1993

An image which cannot be formed on a screen is said to be

Ainverted

Breal

Cvirtual

Derect

Eblurred

View Explanation & Discuss

Question 25

waec 1993

Longitudinal waves cannot be

Adiffracted

Bretracted

Cpolarized

Dreflected

Esuperposed

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Question 26

waec 1993

Which of the following are correct of plane- polarized light? I. Plane polarization of light is the formation of hydrogen bubbles on the particles of light. II. Plane polarization of light is the splitting of light into its spectral components III. Plane-polarized light vibrates in one plane only. IV. Polarization is characteristic of transverse waves.

AI and II only

BI and IV only

CII and III only

DIII and IV only

EI and III only

View Explanation & Discuss

Question 27

waec 1993

A gas has a volume of 546 cm3 at OºC. What is the volume of the gas at -100ºC if its pressure remains constant?

A346cm³

B446cm³

C546cm³

D646cm³

E746 cm³.

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Question 28

waec 1993

A solid metal cube of side 10 cm is heated from
10^oC to 60^oC. lf the linear expansivity of the metal is 1.2 x 10⁵K^-1, calculate the increase in its volume.

A0.6cm³

B1.2 cm³

C1.8 cm³

D3.6 cm³

E6.0cm³.

View Explanation & Discuss

Question 29

waec 1993

The expansion of solids can be considered a disadvantage in the

Afire alarm system

Bthermostat

Criveting of steel plates

Dbalance wheel of a watch

Efitting of wheels on rims.

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Question 30

waec 1993

If the temperature of water is gradually increased from 0^o to 4^oC, the density of the water within this range

Aincreases for a while and then decreases

Bdecreases for a while and then increases

Cincreases gradually

Ddecreases gradually

Eremains the same

View Explanation & Discuss

Question 31

waec 1993

How far will a body move in 4 seconds if uniformly accelerated from rest at the rate of 2 ms-2?

A32m

B24m

C16m

D1.2m

E5m

View Explanation & Discuss

Question 32

waec 1993

An object is projected with a velocity of 100 ms\(^{-1}\) from the ground level at an angle \(\theta\) to the vertical. If the total time of flight of the projectile is 10 s, calculate θ. (g = 10 ms\(^{-2}\)).

A0^o

B30^o

C45^o

D60^o

E90^o

View Explanation & Discuss

Question 33

waec 1993

A block of material of volume 2 X 10\(^{-5}\)m\(^3\) and density 2.5 x 10\(^3\) kgm\(^{-3}\) is suspended from a spring balance with half volume of the block immersed in water. What is the reading of the spring balance? (Density of water =1.0x10\(^3\) kg m\(^{-3}\) g = 10 ms\(^{-2}\)).

A0.10N

B0.25N

C0.30N

D0.40N

E0.50N

View Explanation & Discuss

Question 34

waec 1993

A particle starts from rest and moves with a constant acceleration of 0.5 ms^-2? Calculate the time taken by the particle to cover a distance of 25m.

A25s

B7.1s

C10.0s

D50.0s

E100.0s.

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Question 35

waec 1993

A body of mass m = 0.5 kg is suspended by a string and pulled by a horizontal force of 12N as shown in the diagram. Calculate the tension T in the String if the body is in equilibrium. [Take g as 10ms\(^{-1}\)]

A7.0

B10.9

C12.5

D13.0

E17.0

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Question 36

waec 1993

A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V lf linear momentum is conserved, which of the following expressions correctly represents V?

M₁ U/M₁ + M₂

M₂ U/M₁ + M₂

M₁ + M₂/M₁ U

M₁ - M₂/M₁ U

M₁ U/M₁ - M₂

View Explanation & Discuss

Question 37

waec 1993

A body timed 20 oscillations of a certain pendulum three times and obtained 44.3s, 45.5s and 45.7s respectively. Calculate the mean period of oscillation of the pendulum

A0.13s

B2.22s

C2.26s

D44.30s

E45.17s

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Question 38

waec 1993

Which of the following is a derived unit?

AAmpere

BKilogramme

CSecond

DOhm

EKelvin

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Question 39

waec 1993

A body moves along a circular path with uniform angular speed of 0.6 rad s^-1 and at a constant speed of 3.0ms^-1. Calculate the acceleration of the body towards the centre of the circle.

A25.0ms^-2

B5.4 ms^-2

C5.0ms^-2

D1.8 ms^-2

E0.2ms^-2

View Explanation & Discuss

Question 40

waec 1993

Which of the following is not an example of a force?

ATension

BWeight

CFriction

DMass

EThrust

View Explanation & Discuss

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