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Physics Past Questions

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89 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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89 questions

Question 1 of 20 89 total questions

Question 21

waec 2012

Which of the following substances is the most volatile at room temperature?

Awater

Bdiesel

Cpetrol

Dkerosine

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Question 22

waec 2012

The movement of fluid up or down a narrow tube is

Aosmosis

Bbrownian motion

Ccapillarity

Ddiffusion

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Question 23

waec 2012

A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then

AW > U + V

BW = U + V

CW = U - V

DW < U + V

View Explanation & Discuss

Question 24

waec 2012

A block of wood of density 0.6 gcm\(^{-3}\), weighing 3.06N in air, floats freely in a liquid of density 0.9 gcm\(^{-3}\). Calculate volume of the portion immersed (g = 10ms\(^{-2}\))

A510cm³

B340cm³

C254cm³

D170cm³

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Question 25

waec 2012

Which of the following devices is used to determine the relative density of an acid?

Amanometer

Bhydrometer

Chypsometer

Dhygrometer

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Question 26

waec 2012

The diagram above illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?

Afrequency of collision of trapped air molecules with walls of the syringe is more

Bmolecules of trapped air expands more

Cspeed of the trapped air molecules decreases

Dnumber of molecules of trapped air increases

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Question 27

waec 2012

The derived unit of pressure can be expressed as

Akgms^-2

Bkg m^-1s^-2

Ckg m^-2s^-2

Dkg m^-1s²

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Question 28

jamb 2012

I. Small size.
II. Low power requirement
III. Not easily damaged by high temperature
IV. Highly durable.

Which of the above are the advantages of semiconductors?

AI,II and lll only

Bll,lll and lV only

Cl, II and lV only

Dl, ll, lll and lV

View Explanation & Discuss

Question 29

jamb 2012

If a reverse-biased voltage is applied across a p-n junction, the depletion layer width is

Aincreased

Bdecreased

Cconstant

Dhalved

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Question 30

jamb 2012

The p-n junction diodes can act as rectifiers because they

Aconduct current when forward-biased

Bconduct current when reverse-biased

Cblock current when forward-biased

Dconduct current in both directions

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Question 31

jamb 2012

A piece of radioactive material contains 1000 atmos. If its half -life is 20seconds, the time taken for 125 atoms to remain is

A20 seconds

B40 seconds

C80 seconds

D60 seconds

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Question 32

jamb 2012

Which of the following CANNOT be deflected by both electric and magnetic fields?

AGamma rays

BAlpha particles

CWave particles

DBeta particles

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Question 33

jamb 2012

The process of detecting a pin mistakenly swallowed by a child is X-ray

ADiagnosis

BTherapy

CCrystallography

DMammography

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Question 34

jamb 2012

A conductor of length 1m moves with a velocity of 50ms^-1 at an angle of 30^o to the direction of a uniform magnetic field of flux density 1.5Wbm^-2. What is the e.m.f induced in the conductor?

A37.5V

B50.5V

C75.0V

D80.5V

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Question 35

jamb 2012

The current output from of an a.c. source is given as I = 10 sin to t. The d.c equivalent of the current is

A5.0A

B7.1A

C10.0A

D14.1A

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Question 36

jamb 2012

A particle carrying a charge of 1. 0 x 10^-8C enters a magnetic field at 3.0x 10^-2 ms ^-1 at right angles to the field. If the force on this particle is 1.8 x 10^-8N, what is the magnitude of the field?

A6.0x10^-1T

B6.0x10T

C6.0x10^-3T

D6.0x10^-4T

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Question 37

jamb 2012

The fuse in an electric device is always connected to the

Aneutral side of an electric supply

Bearth side of an electric supply

Clive side of an electric supply

Dterminal side of an electric supply

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Question 38

jamb 2012

A newly charged 12V accumulator can easily start a car whereas eight new dry cells in series with a effective e.m.f. of 12V cannot start the same car because

AThe current capacity is high

BThe current capacity is low

Cit cannot be re-charged

Dit cannot easily be connected to a car

View Explanation & Discuss

Question 39

jamb 2012

Disperson of white light is the ability of white light to

Apenetrate air, water and glass

Bmove in a straight line

Cmove around corners

Dseparate to its component colours

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Question 40

jamb 2012

The use of lenses is Not applicable in the

Aprojector

Bhuman eye

Cperiscope

Dtelescope

View Explanation & Discuss

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