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50 questions

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Question 21

jamb 2004

The binding energy of helium \(^4 _2\) He is [atomic mass of proton = 1.00783U, atomic mass of neutron = 1.00867U]

A4.033U

B2.017U

C0.033U

D0.330U

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Question 22

jamb 2004

In a tuned radio receiver R, L, C series circuit for resonance, the inductive and capacitive reactance X_L and X_C respectively are related as

AX_L = X_C

BX_L = ¹/₂X_C

CX_L = ¹/_{X_C}

DX_L = 2X_C

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Question 23

jamb 2004

In a reverse biased junction diode, current flows in by

Apositive holes alone

Bmajority carriers

Celectron alone

Dminority carriers

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Question 24

jamb 2004

The particle and wave nature of matter are demonstrated in the equation

Aλ = ^hc/_E

Bλ = ^h/_P

Cλ = ^c/_f

Dλ = 2 d sin θ

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Question 25

jamb 2004

A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30o deflection. The sensitivity of the instrument is

A33.0

B0.1

C90.0

D10.0

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Question 26

jamb 2004

X rays can be used in the study of crystal structure because they

Ahave a very long-reaching wavelength

Bhave extremely short wavelength

Care invisible

Dare very fast

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Question 27

jamb 2004

For semi conductor to have negative temperature coefficient of resistance implies that

Atheir resistance decrease with temperature

BThe resistance increase with temperature

Ctheir resistance is constantly changing with temperature

Dthey have electrons and holes at high temperature

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Question 28

jamb 2004

An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is

A1.4A

B1.2A

C12.0A

D14.0A

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Question 29

jamb 2004

A radioisotope has a decay constant of 10\(^{-7}\)s\(^{-1}\). The average life of the radioisotope is

A1.00 x 10⁷s

B6.93 x 10⁶s

C1.00 x 10^-7s

D6.93 x 10⁷s

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Question 30

jamb 2004

A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the

Aarmature coil should be made of silver

Bcommutator should be replaced with slip ring

Ccommutator should be replaced with split rings

Darmature coil should be made of aluminium

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