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49 questions

Question 1 of 20 49 total questions

Question 11

jamb 2003

A magnetic field is said to exist at a point if a force is

Aexerted on a stationary charge at the point

Bexerted on a moving charge at the point

Cdeflected at the point

Dstrengthened at the point

View Explanation & Discuss

Question 12

jamb 2003

An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10-17J, the potential difference between the plate is

A30V

B40V

C300V

D400V

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Question 13

jamb 2003

A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is

A40Ω

B20Ω

C10Ω

D5Ω

View Explanation & Discuss

Question 14

jamb 2003

I the diagram above, what would happen to the current I, if another resistor, R₂, is connected in parallel to R₁?

AIt will increase because the equivalent resistance will increase

BIt will decrease if R₂ is greater than R₁

CIt will increase because the effective resistance will decrease

DIt will decrease if R₂ is less than R₁

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Question 15

jamb 2003

The operation of an optical fibre is based on the principal of

Adispersion of light

Binterference of light

Crefraction of light

Dpolarization of light

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Question 16

jamb 2003

In the diagram above, if each of the resistors can dissipate a maximum of 18W without becoming excessively heated, what is the maximum power the circuit can dissipate?

A27W

B18W

C9W

D5W

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Question 17

jamb 2003

A positive charged rod X is brought near as uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that y has

Ano charge and a zero potential

Ba positive charge and zero potential

Ca negative charge and positive potential

Da negative charge and a negative potential

View Explanation & Discuss

Question 18

jamb 2003

If 1.2 x 10^6J of heat energy is given off in 1 sec from a vessel maintained at a temperature gradient of 30Km-1, the surface area of the vessel is

[ thermal conductivity of the vessel = 400Wm-1K-1]

A1.0 x 10²m²

B9. 0 x 10²m²

C1.0 x 10³m²

D9.0 x 10⁴m²

View Explanation & Discuss

Question 19

jamb 2003

A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10oC. If a temperature rise of 30oC is obtained after 10min, the heat capacity of the material is

A6.0 x 10⁴J^oC^-1

B4.0 x 10⁴J^oC^-1

C1.2 x 10⁴J^oC^-1

D8.0 x 10³J^oC^-1

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Question 20

jamb 2003

If the distance from a point source of sound is doubled, by what factor does the intensity decrease?

A4.00

B2.00

C0.50

D0.25

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Question 21

jamb 2003

At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?

AAt the pole of the mirror

BAt the principal focus

Cat the center of the curvature

DBetween the principal focus and the center of curvature

View Explanation & Discuss

Question 22

jamb 2003

The phenomenon where by the water droplets in the atmosphere combines with dust particles in the air to reduce visibility is

Acloud

Bmist

Chail

Dfog

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Question 23

jamb 2003

If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other, how many images of the object will be formed?

AInfinite

BEight

CFour

DTwo

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Question 24

jamb 2003

On a fairly cool rainy day when the temperature is 20^oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40^oC?
[coefficient of linear expansion of steel = 11 x 10^-6K^-1]

A20.013m

B20.009m

C20.004m

D20.002m

View Explanation & Discuss

Question 25

jamb 2003

An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe, the frequency of the note is

A^2v/_t

B^v/_5t

C^v/_4t

D^v/_2t

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Question 26

jamb 2003

Thermal equilibrium between two object exist when

Athe temperature of both objects are equal

Bthe quantity of heat of both objects is the same

Cthe heat capacities of both objects are the same

Done object losses heat continuously to the other

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Question 27

jamb 2003

By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens?

A15.0

B2.5

C1.5

D0.4

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Question 28

jamb 2003

A turning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur.
[speed of sound in air = 340ms-1]

A0.95m

B0.60m

C0.50m

D0.45m

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Question 29

jamb 2003

TºC	0	5	10	15	20	40	60
S.V.P(mmHg)	4.58	6.51	8.94	12.67	17.50	55.10	149.00

The table above shows the saturation vapour pressure against temperature in a certain town. If the vapour pressure in this town at 20oC is 10mmHg, what is the relative humidity?

A170.0%

B57.0%

C17.5%

D10.0%

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Question 30

jamb 2003

A satellite is in a parking orbit if its period is

Aless than the period of the earth

Bmore than the period of the earth

Cequal to the period of the earth

Dthe square of the period of the earth

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