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4,719 questions

Question 1 of 20 4,719 total questions

Question 591

jamb 2016

If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is

A10cm

B20cm

C25cm

D15cm

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Question 592

jamb 2016

Boiling occurs when the vapour pressure of a liquid is

AAt the evaporation point

BLess than the atmospheric pressure

CGreater than the atmospheric pressure

DEqual to the atmospheric pressure

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Question 593

jamb 2016

The impulse of a force is deduced from Newton's second law as

AF = ma

BF = m( \(\frac{v - u}{t}\))

CF = mg

DF = mv - mu

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Question 594

jamb 2016

A body which weighs 50N in air displaces 3.7kg of water when partially immersed in water. Calculate the upthrust on the body?

A8.7N

B37.0N

C87.0N

D13.0N

View Explanation & Discuss

Question 595

jamb 2016

A manometer is an instrument used for measuring

ARelative density of liquid

BPressure in liquids and gases

CHumidity

DAtmospheric pressure

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Question 596

jamb 2016

A satellite revolving around the earth is kept on its orbit by?

ACentripetal forces only

BCentripetal and frictional forces

CCentrifugal forces only

DCentripetal and centrifugal forces

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Question 597

jamb 2016

Which of the following statements about wave motion is correct?

AElectromagnetic waves are transverse

BTransverse waves do not require a medium for propagation

CLongitudinal waves vibrate perpendicular to the direction of travel

DAll mechanical waves are longitudinal

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Question 598

jamb 2016

Which of the following instruments can be used to measure current in an a.c circuit?

AHot wire ammeter

BMoving coil ammeter

CTangent galvanometer

DMoving coil galvanometer

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Question 599

jamb 2016

Which of the following is obtained when a magenta is mixed with green colour?

AYellow

BBlue

CWhite

DRed

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Question 600

jamb 2016

Shadows and eclipse result from the

AReflection of light

BRectilinear propagation of light

CDiffraction of light

DRefraction of light

View Explanation & Discuss

Question 601

jamb 2016

A pool of water appears to be 1.00m deep when viewed vertically from above. What is the actual depth of the pool?
[Refractive index of water = 1.33]

A13.300m

B0.750m

C1.013m

D1.330m

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Question 602

jamb 2016

Vapour is said to be saturated on top of an enclosed liquid if _________

AThe rate of condensation is greater than that of vapourization

BThe rate of condensation is equal to that of vapourization

CThere is neither condensation nor vaporization of the liquid

DThe rate of condensation is less that that of vaporization

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Question 603

jamb 2016

Which of the following does Not use magnetic effect of current to function?

ALead acid accumulator

BAn electric bell

CA moving coil galvanometer

DA telephone receiver

View Explanation & Discuss

Question 604

jamb 2016

What will happen to the pressure of a gas if its temperature is reduced to -273^oC?

AIt will decrease

Bit will drop to zero

CIt will increase

DIt will remain constant

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Question 605

jamb 2016

The relative density of a liquid is the ratio of the

AMass of water to the mass of an equal volume of liquid

BUpthrust in the liquid to the upthrust in water

CDensity of water to the density of the liquid

DUpthrust in water to the upthrust in the liquid

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Question 606

jamb 2016

Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 10⁶Nm^-2 with a volume of 10^-3m³.
[R = 8.3jmol^-1K^-1]

A201^oC

B126^oC

C153^oC

D185^oC

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Question 607

jamb 2016

Which of the following waves is both transverse and mechanical?

AWater waves

BRadio waves

CSound waves

DX-rays

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Question 608

jamb 2016

A radioactive isotope has a decay constant of 10\(^{-6}\)s\(^{-1}\). Calculate its half-life.

A5.93 x 10⁶s

B6.93 x 10⁵s

C6.93 x 10⁹s

D5.93 x 10⁷s

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Question 609

jamb 2016

Which of the following electromagnetic waves has the shortest wavelength?

AVisible Light

BUltraviolet rays

CInfrared rays

DGamma rays

View Explanation & Discuss

Question 610

jamb 2016

A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

A40s

B10s

C20s

D5s

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