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96 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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96 questions

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Question 31

jamb 2008

I. for current amplification.

II. for voltage stabilization.

III. for power amplification.

IV. as a switch.

which of the above are the uses of transistor?

AI,II,III and IV

BI,III, and IV only

CI, II and III only

DI,II and IV only

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Question 32

jamb 2008

When a pure semiconductor is heated, its resistance?

Aincreases

Bdecreases

Cremains the same

Dincreases and then decreases

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Question 33

jamb 2008

zener diode is used for?

Acurrent amplification

Bpower amplification

Cvoltage regulation

Denergy conversion

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Question 34

jamb 2008

Caesium has a work function of 3 x 10\(^{-19}\)J. The maximum energy of liberated electrons when it is illuminated by light of frequency 6.7 x 10\(^{14}\)

HZ is? [h = 6.6 x 10\(^{-34}\)Js]

A1.42 x 10^-19J

B3.00 x 10^-19J

C4.42 x 1010^-19J

D7.42 x 10^-19J

View Explanation & Discuss

Question 35

jamb 2008

A step-down transformer has a power output of 50 W and efficiency of 80%. if the mains supply voltage is 200 v, calculate the primary current of the transformer.

A0.31 A

B3.20 A

C3.40 A

D5.00 A

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Question 36

jamb 2008

The d.c generator has essentially the same components as the a.c generator except the presence of?

Aslip-ring

Bcarbon brushes

Csplit ring

Darmature

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Question 37

jamb 2008

A generator is on daily use and in the process, ten 60 W and five 40 W tungsten bulbs are on for the same time interval. the energy consumed daily is?

A0.96 kWh

B1.92 kWh

C9.60 kWh

D19.20 kWh

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Question 38

jamb 2008

An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generator is 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated?

A11:1

B1:11

C12:11

D11:12

View Explanation & Discuss

Question 39

jamb 2008

A short chain is sometimes attached to the back of a petrol tanker to?

Agenerate more friction

Bensure the balancing of the tanker

Ccaution the driver when overspeeding

Dconduct excess charges to the earth

View Explanation & Discuss

Question 40

jamb 2008

Short sightedness can be corrected by what type of lens?

AConcave lens

BConvex lens

CConverging lens

DMirrors

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Question 41

jamb 2008

In the microscope, the eyepiece lens merely acts as?

Aan inverter

Ba refiner

Ca diminisher

Da magnifier

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Question 42

jamb 2008

An object placed at the bottom of a well full of clear water appears closer to the surface due to?

Adiffraction

Breflection

Crefraction

Dpolarization

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Question 43

jamb 2008

Convex mirror are used as driving mirrors because images formed are?

Aerect, virtual and diminished

Berect, real and diminished

Cerect, virtual and magnified

Dinverted virtual and diminished

View Explanation & Discuss

Question 44

jamb 2008

An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is?

A20 cm

B15 cm

C10 cm

D5 cm

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Question 45

jamb 2008

An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?

A3.0 cm

B8.0 cm

C12.0 cm

D16.0 cm

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Question 46

jamb 2008

I. Total internal reflection of light.
II. Conservation of light energy.
III. Relative motion of the earth, sun and moon.
IV. Rectilinear propagation of light.
which of the above is a phenomenon of total solar eclipse?

AI and IV only

BII and IV only

CI and III only

DIII and IV only

View Explanation & Discuss

Question 47

jamb 2008

The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?

Awavelength

Bharmonics

Cfrequency

Dvelocity

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Question 48

jamb 2008

Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length

A12.4 m

B15.7 m

C17.5 m

D18.6 m

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Question 49

jamb 2008

In a good thermos flask, heat loss is reduced through the following features EXCEPT?

Athe lens surface

Bthe insulating cork

Csilvered walls

Dthe cork lid

View Explanation & Discuss

Question 50

jamb 2008

If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?

A25%

B33%

C75%

D82%

View Explanation & Discuss

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