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140 questions

Question 1 of 20 140 total questions

Question 51

jamb 2003

The major difference between a pure semiconductor and a pure metal is that

Ametals are harder than semiconductor

Bwhile resistance of metals decrease with temperature , the reverse is the case for semiconductor

Cthe resistance of metals increases with temperature, while for semiconductors, it is the reverse

Dmetals have forbidden gaps while semiconductors have not

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Question 52

jamb 2003

In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer

Awidens

Bnarrows

Cremains constant

Dwidens then narrows

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Question 53

jamb 2003

When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

A1200W

B600W

C120W

D30W

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Question 54

jamb 2003

The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

A2.17V

B1.49V

C1.09V

D0.34V

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Question 55

jamb 2003

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

A90^o

B45^o

C30^o

D0^o

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Question 56

jamb 2003

A circuit has an area of 0.4m2 and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

A8V

B16V

C20V

D80V

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Question 57

jamb 2003

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later

A200 count / min

B100 count / min

C50 count / min

D25 count / min

View Explanation & Discuss

Question 58

jamb 2003

A ray incident on a glass prism undergoes minimum deviation when the

Aincident angle is equal to the angle of refraction

Brefraction angle equals 90^o

Cincident angle equals 90^o

Dincident angle is equal to the angle of emergence

View Explanation & Discuss

Question 59

jamb 2003

The most suitable cell used for short interval switches in electric bells is a

Alead- acid accumulator

BDaniel cell

CLeclanche cell

Dnickel iron accumulator

View Explanation & Discuss

Question 60

jamb 2003

Which of the following pairs of light rays show the widest separation in the spectrum of white light

ABlue and red

BGreen and yellow

CIndigo and violet

DOrange and red

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Question 61

jamb 2003

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

AI and II only

BII and III only

CI, III, and IV only

DII, III and IV only

View Explanation & Discuss

Question 62

jamb 2003

A magnetic field is said to exist at a point if a force is

Aexerted on a stationary charge at the point

Bexerted on a moving charge at the point

Cdeflected at the point

Dstrengthened at the point

View Explanation & Discuss

Question 63

jamb 2003

An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10-17J, the potential difference between the plate is

A30V

B40V

C300V

D400V

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Question 64

jamb 2003

A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is

A40Ω

B20Ω

C10Ω

D5Ω

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Question 65

jamb 2003

I the diagram above, what would happen to the current I, if another resistor, R₂, is connected in parallel to R₁?

AIt will increase because the equivalent resistance will increase

BIt will decrease if R₂ is greater than R₁

CIt will increase because the effective resistance will decrease

DIt will decrease if R₂ is less than R₁

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Question 66

jamb 2003

The operation of an optical fibre is based on the principal of

Adispersion of light

Binterference of light

Crefraction of light

Dpolarization of light

View Explanation & Discuss

Question 67

jamb 2003

In the diagram above, if each of the resistors can dissipate a maximum of 18W without becoming excessively heated, what is the maximum power the circuit can dissipate?

A27W

B18W

C9W

D5W

View Explanation & Discuss

Question 68

jamb 2003

A positive charged rod X is brought near as uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that y has

Ano charge and a zero potential

Ba positive charge and zero potential

Ca negative charge and positive potential

Da negative charge and a negative potential

View Explanation & Discuss

Question 69

jamb 2003

If 1.2 x 10^6J of heat energy is given off in 1 sec from a vessel maintained at a temperature gradient of 30Km-1, the surface area of the vessel is

[ thermal conductivity of the vessel = 400Wm-1K-1]

A1.0 x 10²m²

B9. 0 x 10²m²

C1.0 x 10³m²

D9.0 x 10⁴m²

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Question 70

jamb 2003

A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10oC. If a temperature rise of 30oC is obtained after 10min, the heat capacity of the material is

A6.0 x 10⁴J^oC^-1

B4.0 x 10⁴J^oC^-1

C1.2 x 10⁴J^oC^-1

D8.0 x 10³J^oC^-1

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