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4,719 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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4,719 questions

Question 1 of 20 4,719 total questions

Question 781

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

View Explanation & Discuss

Question 782

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 783

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 784

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 785

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

View Explanation & Discuss

Question 786

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 787

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 788

jamb 2012

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

ADiagnosis

BTherapy

CCrystallography

DMammography

View Explanation & Discuss

Question 789

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

View Explanation & Discuss

Question 790

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 791

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 792

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 793

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 794

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 795

jamb 2012

The use of lenses is Not applicable in the

Aprojector

Bhuman eye

Cperiscope

Dtelescope

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Question 796

jamb 2012

I. Rays of light travel from a less dense medium to a denser medium. II. The Angle of incidence is greater than critical angle. III. Rays of light travel from a denser medium to a less dense medium. Which of the statements above are conditions for total internal reflection to occur?

AI & II only

BI & III only

CII & III only

DII only

View Explanation & Discuss

Question 797

jamb 2012

A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is

A3.33cm

B5.00cm

C6.67cm

D8.50cm

View Explanation & Discuss

Question 798

jamb 2012

After reflection from the concave mirror, rays of light from the sun converges

Aat the radius of curvature

Bat the focus

Cbeyond the radius of curvature

Dbetween the focus and radius of curvature

View Explanation & Discuss

Question 799

jamb 2012

The magnification of an object 2cm tall when placed 10cm in front of a plane mirror is

A6.0

B1.0

C0.7

D0.6

View Explanation & Discuss

Question 800

jamb 2012

A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the the pinhole. If the image is 2.5cm high, the height of the building will be

A25m

B50m

C100m

D150m

View Explanation & Discuss

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