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43 questions

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Question 11

jamb 1993

Which of the following correctly explain(s) why a green leaf appears green in bright day light? i. it absorbs only the green component of sunlight. ii. it absorbs all colour of sunlight except green. iii. it reflects only the green component of sunlight.

Ai only

Bii only

Ci and iii only

Dii and iii only

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Question 12

jamb 1993

The property of the eye known as its power of accommodation is controlled by the

Apupil

Bvirteous humour

Ciris

Dciliary muscles

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Question 13

jamb 1993

A beam of light is incident from air to water at an angle of 30^oC. Find the angle of refraction if the refractive index of water is \(\frac{4}{3}\)

A15^oC

B18^oC

C22^oC

D24^oC

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Question 14

jamb 1993

Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.

Aii only

Bii and iii only

Ci and iii only

Di, ii, and iii only

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Question 15

jamb 1993

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

A17cm

B20cm

C25cm

D100cm

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Question 16

jamb 1993

Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?

A\(\frac{V}{r}\) - 1

B\(\frac{2V}{r}\) - 1

C\(\frac{U}{r}\) - 1

D\(\frac{2U}{r}\) - 1

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Question 17

jamb 1993

Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10\(^{-3}\)S. How far is the aircraft from the antenna? [c = 3 x 10\(^8\)ms\(^{-1}\) ]

A6.0 x 10\(^2\)km

B1.2 x 10³km

C3.0 x 10³km

D6.0 x 10 ⁵km

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Question 18

jamb 1993

Which of the following waves can propagate through a vacuum?

AHigh velocity sound waves

BUltrasonic waves

CAcoustic waves

DInfra-red waves

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Question 19

jamb 1993

Determine the distance between the consecutive antinodes XX if the wavelength is 60cm

A15cm

B30cm

C60cm

D120cm

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Question 20

jamb 1993

The relationship between L and the wavelength I of the stationary wave is

A2L = \(\lambda\)

BL = \(\lambda\)

CL = \(\frac {\lambda}{3}\)

D4L = 3 \(\lambda\)

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Question 21

jamb 1993

200g of water at 90°C is mixed with 100g of water at 30°C. What is the final temperature?

A50^oC

B60^oC

C70^oC

D80^oC

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Question 22

jamb 1993

When the volume of a given mass of gas is halved and its temperature doubled, the pressure

Aremains constant

Bincreases by a factor of 4

Cincreases by a factor of 3

Ddecreases by a factor of 4

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Question 23

jamb 1993

A metal rod 800mm long is heated from 10^oC to 95^oC. If it expands by 1.36mm, the linear expansivity of the metal is

A2.0 x 10²K^-1

B2.0 x 10²K^-1

C5.0 x 10^-3K^-1

D2.0 x 10^-5K^-1

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Question 24

jamb 1993

The thermometric properties of the thermocouple is that is

Ae.m.f. changes with temperature

Bresistance changes with temperature

Cvolume changes with temperature

Dpressure changes with resistance

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Question 25

jamb 1993

An object of mass 400g and density 600kgm^-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm^-3. The tension in the string is

A1.0N

B3.0N

C4.0N

D5.0N

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Question 26

jamb 1993

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm\(^{-3}\) and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms\(^{-2}\)]

A9 x 10⁴Nm^-2

B4 x 10⁴Nm^-2

C3 x 10⁴Nm^-2

D2 x 10⁴Nm^-2

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Question 27

jamb 1993

A plane inclined at angle \(\theta\) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by

Atan\(\theta\) = \(\frac{1}{10}\)

Bcot\(\theta\) = \(\frac{1}{10}\)

Ccos\(\theta\) = \(\frac{1}{10}\)

Dsin\(\theta\) = \(\frac{1}{10}\)

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Question 28

jamb 1993

Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?

AElectrical \(\to\) mechanical \(\to\) potential

Bpotential \(\to\)mechanical \(\to\)electrical \(\to\) light

Cmechanical \(\to\) sound \(\to\) electrical \(\to\) light

Dkinetic \(\to\) mechanical \(\to\) electrical \(\to\)light

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Question 29

jamb 1993

The force experienced by an object of mass 60.0kg in the moon's gravitational field is 1.002 x 10²N. What is the intensity of the gravitational field?

A0.60Nkg^-1

B1.67Nkg^-1

C6.12 x 10²Nkg^-1

D9.81ms^-2

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Question 30

jamb 1993

A rocket burns fuel at the rate of 10kgs^-1 and ejects it with velocity of 5 x 10³ms^-1. The thrust exerted by the gas on the rock is

A2.5 x 10⁷N

B5.0 x 10⁴N

C5.0 x 10²N

D2.0 x 10^-3N

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