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87 questions

Question 1 of 20 87 total questions

Question 1

jamb 2018

The critical angle for light traveling from a transparent medium to air s measured as 34º. The refractive index of the medium is

A0.56

B1.50

C1.79

D2.02

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Question 2

jamb 2018

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 340ms\(^-1\), how far is he from the hill?

A66m

B136m

C264m

D528m

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Question 3

jamb 2018

A solid weighs 45N and 15N respectively in air and water. Determine the relative density of the solid

A0.33

B0.50

C1.50

D3.00

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Question 4

jamb 2018

A resistor connected to a 12V battery draws a current of 2A. The energy dispatched in the resistor in 5 minutes is ___.

A3,600J

B6,000J

C7,200J

D14,400J

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Question 5

jamb 2018

When a known standard resistor of 2.0 is connected to the 0.0cm end of a metre bridge, the balance point is found to be at 55.0cm

A1.10Ω

B1.64Ω

C2.44Ω

D27.50Ω

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Question 6

jamb 2018

The photo cell works on the principle of the

AVoltaic cell

BEmission of electron by incident radiation

CEmission of protons by incident radiation

DPhotographic plate

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Question 7

jamb 2018

A lens of focal length 15cm forms an erect image which is three times the size of the object. The distance between the object and the image is ___.

A10cm

B20cm

C30cm

D40cm

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Question 8

jamb 2018

The image of an object is located 6cm behind a convex mirror. If it's magnification is 0.6, calculate the focal length of the mirror

A3.75cm

B6.70cm

C10.00cm

D-15.00cm

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Question 9

jamb 2018

If the focal length of a camera is 20cm, the distance from the film at which the lens must be set to produce a sharp image of 100cm away is

A17cm

B20cm

C25cm

D100cm

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Question 10

jamb 2018

Electrical power is transmitted at a high voltage rather than a low voltage because the amount of energy loss is due to

AHeat dissipation

BProduction of eddy currents

CExcessive current discharge

DExcessive voltage discharge

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Question 11

jamb 2018

Which of the following instruments is most suitable for measuring the outside diameter of a narrow pipe in a few millimeters in diameter?

APair of calipers

BMeter rule

CMicrometer screw gauge

DTape rule

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Question 12

jamb 2018

An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is

A25.2N

B17.4N

C12.6N

D9.0N

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Question 13

jamb 2018

The efficiency of energy conversion on the energy flow through a hydroelectric power is?

A\(\frac{E1}{E2}\)

B\(\frac{E3}{E2}\)

C\(\frac{E2}{E1}\)+ E2

D\(\frac{E2}{E3}\) + E1

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Question 14

jamb 2018

A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms\(^{-1}\). Determine the magnitude of the resulting impulse

A20.0kgms\(^{-1}\)

B10.0kgms\(^{-1}\)

C5.0kgms\(^{-1}\)

D2.5kgms\(^{-1}\)

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Question 15

jamb 2018

Palm oil from a bottle flows out more easily after it has been heated because the

AMolecules do not increase speed during the heating

BViscosity of oil is reduced

COil molecules force each other out

DAdhesion between the oil molecules and those of the bottle is increased

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Question 16

jamb 2018

Which of the following is the dimension of pressure

AML\(^{−1}\)T\(^{−2}\)

BMLT\(^{−2}\)

CML\(^{2}\)T\(^{3}\)

DML\(^{−3}\)

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Question 17

jamb 2018

To keep a vehicle moving at a constant speed V requires power P from the engine. The force provided by the engine is

A\(\frac{P}{v}\)

B(\(\frac{1}{2}\))V

CPV

D\(\frac{P}{V^2}\)

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Question 18

jamb 2018

A particle of mass M initially at rest splits into two. If one of the particles of mass M1 moves with velocity V1 , the second particle moves with velocity

A\(\frac{M1V1}{M-M1}\)

B\(\frac{M1V1}{M1-M}\)

C\(\frac{M1V1}{M}\)

D\(\frac{MV}{M-M1}\)

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Question 19

jamb 2018

The friction which exist between two layers of liquid in relative motion is called.

ACapillary

BSurface

CViscosity

DCohesion

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Question 20

jamb 2018

Which of the following phenomena cannot be explained by the molecular theory of matter?

AConduction

BConvection

CExpansion

DRadiation

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