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2,483 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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2,483 questions

Question 1 of 20 2,483 total questions

Question 581

jamb 2006

In a gas experiment, if the volume of the gas is plotted against the reciprocal of the pressure, the unit of the slope of the resulting curve is

Aforce

Btemperature

Cpower

Dwork

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Question 582

jamb 2006

A mirror of weight 75N is hung by a cord from a hook on the wall. If the cord makes an angle of 30o with horizontal, the tension in the cord is

A100N

B1500N

C250N

D150N

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Question 583

jamb 2006

In the diagram above, the pressure of the gas is

A86 cm of mercury

B66 cm of mercury

C96 cm of mercury

D76 cm mercury

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Question 584

jamb 2006

The diagram above represents the stress-strain graph for a typical metal rod. What does the X represent?

ABreaking point

BYield point

CElastic limit

DProportional limit

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Question 585

jamb 2006

A conductor has a diameter of 1.00 mm and length 2.00m. if the resistance of the material is 0.1Ω, its resistivity is?

A2.55 x 10⁵ Ωm

B2.55 x 10² Ωm

C3.93 x 10^-6 Ωm

D3.93 x 10^-8 Ωm

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Question 586

jamb 2006

A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?

A37.50 cm

B75.00 cm

C18.75

D25.00 cm

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Question 587

jamb 2006

The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?

A33 cm

B44 cm

C22 cm

D17 cm

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Question 588

jamb 2006

Non-luminous object can be seen because they

Areflect light

Bare near

Care polished

Demit light

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Question 589

jamb 2006

A submarine is observed to rise from a real depth of 80 m to 60 m in water. Calculate the change in apparent depth.
[Refraction index of water \(\frac{4}{3}\)]

A45 m

B80 m

C15 m

D60 m

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Question 590

jamb 2006

An object placed 10cm from a concave mirror of focal length 5cm would have its image

Aat the centre of convature

Bat the radius of curvature

Cat infinity

D10 cm from the focus

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Question 591

jamb 2006

A p-n junction diode is used as?

Aa rectifier in a d.c circuit

Ban amplifier in d.c circuit

Can anplifier in an a.c circuit

Da rectifier in an a.c circuit

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Question 592

jamb 2006

A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?

Aboron and antimony

Bboron and sodium

Caluminium and indium

Darsenic and antimony

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Question 593

jamb 2006

I. The number of neutrons released exceeds the number that caused the fission.
II. There is loss of mass.
III. Energy is produced.
IV. Smaller nuclei merge to form larger nuclei
which of the statement above are correct about nuclear fission?

AII,III and IV only

BI, II and IV only

CI,II and III only

DI, III and IV only

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Question 594

jamb 2006

The theory of electronic conduction in solids, which satisfactorily explains the properties of conductors, insulators and semi-conductor,is?

Astring theory

Bparticle theory

Cgroup theory

Dband theory

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Question 595

jamb 2006

A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?

A\(\frac{15}{16}\)

B\(\frac{1}{16}\)

C\(\frac{3}{4}\)

D\(\frac{1}{4}\)

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Question 596

jamb 2006

One of the properties of gamma rays is that they are?

Aneutral

Bmassive

Cpositively charged

Dnegatively charged

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Question 597

jamb 2006

The battery connection that permits current to flow across a p-n junction is called?

Areverse baised

Bforward baised

Camplification.

Drectification

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Question 598

jamb 2006

The process through which free electrons leave the surface of hot metal is known as?

Aphoton emission

Bphoto emission

Cthermionic emission

Delectron emission

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Question 599

jamb 2006

The energy associated with the emitted photon when a mercury atom changes from one state to another is 3.3 ev. calculate the frequency of the photon.

[e = 1.6 x 10-19c; h = 6.6 x 10-34js]

A1.3 x 10^-15 Hz

B3.1 x 10⁵² Hz

C3.2 x 10^-53 Hz

D8.0 x 10¹⁴ Hz

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Question 600

jamb 2006

I. Work done by load is always less than the work done by effort.
II. All machines are made of levers, pulleys, screws and gear wheels.
III. A fishing rod is a machine.
Iv. Effort is always larger than load.
which of statements above about machines are true?

AII and III

BIII and IV

CI and III

DII and iv

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