JAMB Physics questions

450 questions with answers and explanations. Tap an option to check yourself.

1. Question 201· Heat transfer· JAMB

   The silvered walls of a vacuum flask mainly reduce heat transfer by

   • Aconvection
   • Bconduction
   • Cradiation
   • Devaporation

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2. Question 202· Heat transfer· JAMB

   Convection can take place only in

   • Asolids
   • Bfluids (liquids and gases)
   • Ca vacuum
   • Dmetals

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3. Question 203· Heat transfer· JAMB

   Heat is transferred mainly by conduction in

   • Agases
   • Bsolids
   • Ca vacuum
   • Dliquids only

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4. Question 204· Heat transfer· JAMB

   A good absorber of radiant heat is also a good

   • Aconductor
   • Breflector
   • Cemitter
   • Dinsulator

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5. Question 205· Heat transfer· JAMB

   A greenhouse stays warm because glass

   • Areflects all sunlight
   • Bconducts heat inwards
   • Cproduces heat itself
   • Dlets in short-wavelength radiation from the sun but blocks the long-wavelength radiation given off inside

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6. Question 206· Heat transfer· JAMB

   A sea breeze blows from the sea to the land

   • Aduring the day, when the land is warmer than the sea
   • Bat night, when the sea is warmer
   • Conly during storms
   • Donly in the dry season

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7. Question 207· Heat transfer· JAMB

   Heat from the Sun reaches the Earth mainly by:

   • Aconduction
   • Bconvection
   • Cevaporation
   • Dradiation

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8. Question 208· Heat transfer· JAMB

   Land and sea breezes are caused by

   • Aconvection
   • Bconduction
   • Cradiation only
   • Devaporation

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9. Question 209· Heat transfer· JAMB

   Metals are good conductors of heat mainly because they contain

   • Awater
   • Blarge atoms
   • Cair spaces
   • Dfree electrons

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10. Question 210· Heat transfer· JAMB

    During the day, a sea breeze blows from sea to land because

    • Athe land heats faster, so warm air over it rises and cooler sea air moves in
    • Bthe sea is warmer than the land
    • Cthe moon pulls the air
    • Dradiation cools the land

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11. Question 211· Introductory electronics· JAMB

    In a p-type semiconductor, the majority charge carriers are

    • Aelectrons
    • Bholes
    • Cprotons
    • Dions

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12. Question 212· Introductory electronics· JAMB

    Which of the following is a semiconductor?

    • Arubber
    • Bcopper
    • Csilicon
    • Dglass

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13. Question 213· Introductory electronics· JAMB

    The majority charge carriers in a p-type semiconductor are

    • Aelectrons
    • Bholes
    • Cprotons
    • Dneutrons

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14. Question 214· Introductory electronics· JAMB

    A diode is used in circuits because it

    • Ameasures current
    • Bstores charge
    • Cincreases voltage
    • Dallows current to flow in one direction only

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15. Question 215· Introductory electronics· JAMB

    A semiconductor doped with a pentavalent impurity such as phosphorus is

    • Aintrinsic
    • Bp-type
    • Cn-type
    • Dan insulator

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16. Question 216· Introductory electronics· JAMB

    Rectification is the process of

    • Aamplifying a signal
    • Bconverting d.c. to a.c.
    • Cconverting a.c. to d.c.
    • Dstoring charge

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17. Question 217· Introductory electronics· JAMB

    A transistor can be used as

    • Aa battery
    • Ba rectifier only
    • Ca capacitor
    • Dan amplifier or a switch

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18. Question 218· Introductory electronics· JAMB

    A p-n junction diode conducts when:

    • Areverse biased
    • Bunbiased
    • Cforward biased
    • Dheated

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19. Question 219· Introductory electronics· JAMB

    A diode connected with its n-side to the positive terminal of a battery

    • Abecomes a capacitor
    • Bconducts strongly
    • Cglows
    • Ddoes not conduct, because it is reverse biased

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20. Question 220· Introductory electronics· JAMB

    A p-n junction diode is forward-biased when

    • Athe n-side is connected to the positive terminal
    • Bthe p-side is connected to the positive terminal
    • Cno voltage is applied
    • Dit is heated

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