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2,483 questions

Question 1 of 20 2,483 total questions

Question 831

jamb 1995

If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is

A1 : 6

B1 : 3

C2 : 1

D6 : 1

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Question 832

jamb 1995

At different locations on the earth's surface, the earth's magnetic field is

Athe same in magnitude and direction

Bthe same in magnitude but different in direction

Cdifferent in both magnitude and direction

Ddifferent in magnitude but different in direction

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Question 833

jamb 1995

Two parallel plates at a distance of 8.0 x 10^-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?

A4.8 Vm^-1

B75.0Vm^-1

C4800.0Vm^-1

D75000.0Vm^-1

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Question 834

jamb 1995

Which of the following pairs of colours gives the widest separation in the spectrum of white light?

ARed and Violet

BGreen and Yellow

CRed and Indigo

DYellow and Violet

View Explanation & Discuss

Question 835

jamb 1995

A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is

Aconvex and u =2f

Bconcave and u = 2f

Cconvex and u = f

Dconcave and u = f

View Explanation & Discuss

Question 836

jamb 1995

What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?

A21^o

B22^o

C23^o

D24^o

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Question 837

jamb 1995

Total eclipse of the sun occurs when the

Aearth is between the moon and the sun

Bsun is between the moon and the earth

Cmoon is between the sun and the earth

Dozone layer is threatened

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Question 838

jamb 1995

The pitch of an acoustic device can be increased by

Aincreasing the frequency

Bincreasing the amplitude

Cdecreasing the loudness

Ddecreasing the intensity

View Explanation & Discuss

Question 839

jamb 1995

The difference between sound waves and light waves is that sound waves

Aare transverse while light waves are longitudinal

Brequire a medium to travel while light waves does not

Ccan be diffracted but light waves cannot

Dcannot be reflected but light waves can

View Explanation & Discuss

Question 840

jamb 1995

The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?

A7500m

B300m

C75m

D15m

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Question 841

jamb 1995

Which of the following is the exclusive property of a transverse wave?

Adiffraction

Brefraction

Ccompression

Dpolarization

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Question 842

jamb 1995

A well-lagged bar of length 100cm has its ends maintained at 100oC and 40oC respectively. What is the temperature at a point 60cm from the hotter end?

A58^oC

B62^oC

C64^oC

D76^oC

View Explanation & Discuss

Question 843

jamb 1995

Which of the following statements give the TRUE difference between evaporation and boiling? i. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure. ii. Evaporation is a surface phenomenon while boiling is an interior phenomenon. iii. Evaporation is affected by surface area while boiling is not.

Ai and ii only

Bi and iii only

Cii and iii only

Di, ii, iii.

View Explanation & Discuss

Question 844

jamb 1995

A quantity of ice at 10^oC is heated until the temperature of the heating vessel is 90^oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?

Aspecific heat capacity of ice

Bspecific heat capacity of water

Cspecific latent heat of fusion

Dspecific latent heat of vaporization

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Question 845

jamb 1995

A temperature scale has a lower fixed point of 40mm and a upper fixed point of 200mm. What is the reading on this scale when a thermometer reads 60^oC?

A33.3mm

B36.0mm

C96.0mm

D136.0mm

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Question 846

jamb 1995

An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1]

A420S

B336S

C168S

D48S

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Question 847

jamb 1995

The equation PxVyTz = constant in charles' law when

Ax = 1, y = -1, z = 1

Bx = 0, y = 1, z = -1

Cx = 1, y = 0, z = -1

Dx = 0, y = 1, z = 1

View Explanation & Discuss

Question 848

jamb 1995

A piece of wood floats inside water at room temperature with a fraction of it above the liquid surface. As the temperature of the water is raised, the part of the wood above the liquid will

Adecrease because the density of water decreases with temperature

Bincrease because the density of water decreases with temperature

Cdecreases because the density of water increases with water temperature

Dincrease because the density of water increases with temperature

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Question 849

jamb 1995

A rectangular metal block of volume 10\(^{-6}\)m\(^3\) at 273k is heated to 573k. If its coefficient of linear expansion is 1.2 x 10\(^{-5}\)k\(^{-1}\), the percentage change of it volume is

A1.5%

B1.1%

C0.4%

D0.1%

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Question 850

jamb 1995

Temperature is the measure of the

Aquantity of heat transferred into the molecules of an object

Bmean kinetic energy of the molecules of the object

Ckinetic energy of any individual molecule of the substance

Damount of work done by the molecules of the object

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