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50 questions

Question 1 of 20 50 total questions

Question 11

jamb 2007

The ratio of the coefficient of linear expansion of two metals \(\frac{∝_1}{∝_2}\) is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, \(\frac{e_1}{e_2}\) is 1:2, the ratio of the original lengths \(\frac{l_1}{l_2}\) is

A⁸/₃

B³/₂

C²/₃

D³/₈

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Question 12

jamb 2007

A blacksmith heated a metal whose cubic expansivity is 6.3 x 10\(^{-6}\)K\(^{-1}\). The area expansivity is

A2.0 x 10^-6K^-1

B2.1 x 10^-6K^-1

C4.2 x 10^-6K^-1

D6.3 x 10^-6K^-1

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Question 13

jamb 2007

A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60^o to the floor. The work done after a distance of 3m is

A3 J

B4 J

C5 J

D6 J

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Question 14

jamb 2007

In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

A40N

B80N

C120N

D200N

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Question 15

jamb 2007

From the diagram above, the bob of the pendulum has the fastest speed at

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Question 16

jamb 2007

The figure above shows 4 forces 3N, 10N, 3√3N and 6N acting on a particle P. The resultant of he four forces is

A5N

B5√ 3N

C10N

D10√ 3N

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Question 17

jamb 2007

Silicon doped with aluminum and germanium doped with arsenic become?

Ap- and n- types respectively

Bn- en p- type respectively

Cp- type semiconductor

Dn- type semiconductors

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Question 18

jamb 2007

The bond that forms a semiconductor is?

Acovalent

Belectrovalent

Cionic

Dmetallic

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Question 19

jamb 2007

The energy E of a photon and its wavelength are related by Eλ = X. the numerical value of X is?
[h = 6.63 x 10\(^{-34}\)js, c = 3 x 10\(^8\) ms\(^{-1}\)]

A6.6 X 10^-28

B1.99 X 10^-27

C6.60 x 10^-26

D1.99 x 10^-25

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Question 20

jamb 2007

A charge 50 µc has electric field strength of 360 NC-1 at a certain point. The electric field strength due to another charge 120 µc kept at the same distance apart and in the same medium is?

A864 NC^-1

B150 NC^-1

C144 NC^-1

D18 NC^-1

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Question 21

jamb 2007

The production of pure spectrum could easily be achieved using a?

Aglass prism with a pin

Btriangular prism with two convex lens

Ctraingular prism only

Dtriangular prism with two concave lenses

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Question 22

jamb 2007

When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?

ASimple microscope

Brefecting lens

Ccompound microscope

Dprojector

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Question 23

jamb 2007

A glass plate 0.9cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate?
[c = 3.0 x 10\(^8\) ms-1]

A4.5 x 10^-11s

B4.5 x 10^-10s

C4 .5 x 10^-12 s

D3.0 x 10^-10s

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Question 24

jamb 2007

The instrument used by designers to obtain different color pattern is called?

Aperiscope

Bsextant

Cepiscope

Dkaleidoscope

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Question 25

jamb 2007

The phenomenon of light bending round an obstacle is?

Adiffraction

Brefraction

Creflection

Dpolarization

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Question 26

jamb 2007

In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to

AIncrease the reverberation of sound in the hall

Bincrease the amount of echo in the hall

Creduce the hight of the ceiling from the floor

Dreduce the reverberation of sound in the hall

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Question 27

jamb 2007

I. They should be identical
II. They should originate from the same source.
III. They should be coherent.
IV. They should be monochromatic.
from the statements above, the conditions for two waves to interfere are?

AI,II and III only

BI, III and IV only

CII, III and IV only

DI, II, III and IV

View Explanation & Discuss

Question 28

jamb 2007

The blade of a hoe feel colder to touch in the morning than the wooden handle because the

Ahandle is a better conductor of heat than blade

Bhandle contains stored energy in form of heat

Cblade is a better conductor of heat than the handle

Dblade is placed at a lower temperature than the heat

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Question 29

jamb 2007

I. Mass
II. Density
III. Temperature
IV. Nature of substance
which of the above affect diffusion?

AI and II only

BI,II and IV only

CII, III and IV only

DI, II, III and IV

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Question 30

jamb 2007

I. Increase the melting point of the liquid.
II. Increase the boiling point of the liquid.
III. Decrease the melting point of the liquid.
IV. Decrease the boiling point of the liquid.
which of the statement above about the effect on increase in pressure in a liquid are correct?

AI and II only

BI and III only

CII and III only

DIII and IV only

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