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147 questions

Question 1 of 20 147 total questions

Question 61

jamb 2005

An electric device is rated 2000 W, 250 v. The correct fuse rating of the device is?

A9 A

B8 A

C6 A

D7 A

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Question 62

jamb 2005

Satellite communication network makes use of?

Avisible light

Bsound wave

Cradio wave

Dinfra-red wave

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Question 63

jamb 2005

When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because?

Aof the even expansion of glass

Bglass is a crystal

Cglass is a good conductor of heat

Dof the uneven expansion of glass

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Question 64

jamb 2005

I. Melting

II. Boiling

III. Refraction

IV. Conduction

Which combination of the above is evident of the molecular nature of matter?

AII , III and IV only

BI ,II and IV only

CI , III and IV only

DI , II and III only

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Question 65

jamb 2005

The process whereby a liquid turns spontaneously into vapour is called?

Aregelation

Bsublimation

Cboiling

Devaporation

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Question 66

jamb 2005

I. reproducibility

II. Sensibility

III. High thermal capacity

iv. High accuracy

The quantities of a good thermometer include?

AI, II and IV only

BI, III and IV only

CI, II and III only

DII, III and IV only

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Question 67

jamb 2005

The process whereby the molecules of different substances move randomly is called?

Acapillarity

Bsurface tension

Cosmosis

Ddiffusion

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Question 68

jamb 2005

A body of mass 36kg falls through a viscous liquid which offers a drag force of 260N on the body. The upthrust on the body at terminal velocity is?
[g = 10ms\(^2\)]

A100N

B620N

C50N

D310N

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Question 69

jamb 2005

A 3m³ volume of liquid W of density 200kgm³ is mixed with another liquid L of volume 7m³ and density 150kgm^-3. the density of mixture is?

A165kgm^-3

B100kgm^-3

C265kgm^-3

D350kgm^-3

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Question 70

jamb 2005

When the temperature difference between the wet and dry bulbs of a hygrometer is high, this indicates that

Ait is about to rain

Bthe relative humidity is high

Cthere is plenty of sunshine

Dthe relative humidity is low

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Question 71

jamb 2005

which of the following materials is a conductor?

AGlass

BWax

CSodium

DPlastic

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Question 72

jamb 2005

The current in a reverse-biased junction is due to?

Aminority carriers

Belectrons

Cmajority carriers

Dholes

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Question 73

jamb 2005

A transformer is rated 240v. If the primary coil is 4000 turns and the secondary voltage 12v, determine the number of turns in the secondary coil.

A200

B100

C250

D150

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Question 74

jamb 2005

The ray which causes gas molecules to glow is known as

Acathode ray

Banode ray

Cmolecular ray

Dgamma ray

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Question 75

jamb 2005

The charge carriers in gasses are

Aions only

Belectrons and ions

Celectrons and holes

Delectrons only

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Question 76

jamb 2005

A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. the most likely group of the element is

BIII

DII

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Question 77

jamb 2005

When impurities are added to semi-conductors, the conductivity of the semi-conductor

Aincreases then decreases

Bincreases

Cdecreases

Dremains constant

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Question 78

jamb 2005

A proton moving with a speed of 1.0 x 10\(^6\)ms\(^{-1}\) through a magnetic field of 1.0T experiences a magnetic force of magnitude 8.0 x 10\(^{-14}\) N. The angle between the proton's velocity and the field is

[1.6 x 10\(^{-19}\)C]

A60°

B90°

C30°

D45°

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Question 79

jamb 2005

the time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is

A250days

B150days

C300days

D200days

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Question 80

jamb 2005

In an a.c circuit that contains only a capacitor, the voltage lags behind the current by

A180°

B90°

C60°

D30°

View Explanation & Discuss

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