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50 questions

Question 1 of 20 50 total questions

Question 11

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 12

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 13

jamb 2006

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

Aneutral

Bmassive

Cpositively charged

Dnegatively charged

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Question 14

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 15

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 16

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 17

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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Question 18

jamb 2006

The correct unit of energy density is?

Akg m³ s^-2

Bkg m² s^-2

Ckg m^-3 s^-2

Dkg m^-1 s^-2

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Question 19

jamb 2006

The component of vector X along the direction of vector Y is zero when

AX and Y are in opposite directions to each other

BX is at an angle of 45° to Y

CX is perpendicular to Y

DX and Y are parallel to each other

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Question 20

jamb 2006

If the radius of the Earth is 6.4 x 10\(^6\)m, the escape velocity of a satellite from the Earth is?
[g = 10 ms\(^-2\)]

A1.13 x 10⁴ ms^-1

B9.00 x 10³ ms^-1

C8.00 x 10³ ms^-1

D1.27 x 10⁴ ms^-1

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Question 21

jamb 2006

In an experiment to determine terminal velocity, as the pressure increases, the viscosity off a liquid

Aincreases

Bdecreases

Cincreases then decreases

Dremains constant

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Question 22

jamb 2006

The motion of smoke particles from a chimney is typical of?

Arandom motion

Bcircular motion

Crotational motion

Doscillatory motion

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Question 23

jamb 2006

An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?

A0.25Ω

B5.00Ω

C19.80Ω

D0.05Ω

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Question 24

jamb 2006

When a certain a.c supply is connected to a lamp, it lights with the same brightness as it does with a 12 V d.c battery. Then r.m.s value of the a.c supply is?

A12.0 V

B3.5 V

C17.0 V

D8.5

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Question 25

jamb 2006

During electrolysis, 2.0 g of a metal is deposited using a current of 0.5 A in 3 hours. The mass of the same metal which can be deposited using a current of 1.5 A in 1 hour is?

A1.0 g

B0.5 g

C3.0 g

D2.0 g

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Question 26

jamb 2006

The electrolyte in the Nickei-iron (Nife) accumulator is

Apotassium hydroxide solution

Bdilute tetraoxosulphate(VI)acid

Ccopper tetraoxosulphate(VI)solution

Dammonium chloride solution

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Question 27

jamb 2006

When an a.c. voltage is applied to a capacitor, no power is consumed because the current

Aleads the voltage by 90°

Blags behind the voltage by 90°

Cand voltage are in phase

Dand voltage are 180° out of phase

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Question 28

jamb 2006

If the capacitance of a capacitor is C = \(\frac{(εA)}{d}\) which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

Aconstant (ε) and area

Barea and distance.

Cconstant (ε) only

Ddistance only

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Question 29

jamb 2006

An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.

A0.25 W

B4.00 W

C38.40W

D60.00W

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Question 30

jamb 2006

The main purpose of the transformer in an a.c radio set is to?

Aincrease power to the radio

Bstep up the voltage

Cconvert energy from a.c to d.c

Dstep down the voltage

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