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4,719 questions

Question 1 of 20 4,719 total questions

Question 1311

jamb 2003

Given that Young's modulus for aluminium is 7.0 x 10\(^{10}Nm^{-2}\) and density is 2.7 x 10\(^3\)kgm\(^{-3}\), find the speed of the sound produced if a solid bar is struck at one end with a hammer

A5.1 x 10³ms^-1

B4.2 x 10³ms^-1

C3.6 x 10³ms^-1

D2.8 x 10³ms^-1

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Question 1312

jamb 2003

A force of 100N was used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked

A\(32ms^{-1} \)

B\(50ms^{-1} \)

C\(64ms^{-1} \)

D\(100ms^{-1} \)

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Question 1313

jamb 2003

An electron makes a transition from a certain energy level E_k to the ground state E₀. If the frequency of emission is 8.0 x 10¹⁴Hz The energy emitted is

A8.25 x 10^-19J

B5.28 x 10^-19J

C5.28 x 10¹⁹J

D8.25 x 10¹⁹J

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Question 1314

jamb 2003

In the calibration of an ammeter using faraday's laws of electrolysis, the ammeter reading is kept constant at 1.2A. If 0.990g of copper is deposited in 40 minutes , the correction to be applied to the ammeter is

A0.03A

B0.04A

C0.05A

D0.06A

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Question 1315

jamb 2003

A ray of light is incident on an equilateral triangular glass prism of refractive index 3/2, Calculate the angle through which the ray is minimally deviated in the prism

A30.0\(^{\circ} \)

B37.2\(^{\circ} \)

C42.0\(^{\circ} \)

D48.6\(^{\circ} \)

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Question 1316

jamb 2003

A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction

A\( 2 \times 10^{-4}J \)

B\( 2 \times 10^{-3}J \)

C\( 2 \times 10^{1}J \)

D\( 2 \times 10^{2}J \)

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Question 1317

jamb 2003

When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

Alost energy

Bwork function

Cbinding energy

Dstability energy

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Question 1318

jamb 2003

The major difference between a pure semiconductor and a pure metal is that

Ametals are harder than semiconductor

Bwhile resistance of metals decrease with temperature , the reverse is the case for semiconductor

Cthe resistance of metals increases with temperature, while for semiconductors, it is the reverse

Dmetals have forbidden gaps while semiconductors have not

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Question 1319

jamb 2003

In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer

Awidens

Bnarrows

Cremains constant

Dwidens then narrows

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Question 1320

jamb 2003

When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

A1200W

B600W

C120W

D30W

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Question 1321

jamb 2003

The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

A2.17V

B1.49V

C1.09V

D0.34V

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Question 1322

jamb 2003

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

A90^o

B45^o

C30^o

D0^o

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Question 1323

jamb 2003

A circuit has an area of 0.4m2 and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

A8V

B16V

C20V

D80V

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Question 1324

jamb 2003

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later

A200 count / min

B100 count / min

C50 count / min

D25 count / min

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Question 1325

jamb 2003

A ray incident on a glass prism undergoes minimum deviation when the

Aincident angle is equal to the angle of refraction

Brefraction angle equals 90^o

Cincident angle equals 90^o

Dincident angle is equal to the angle of emergence

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Question 1326

jamb 2003

The most suitable cell used for short interval switches in electric bells is a

Alead- acid accumulator

BDaniel cell

CLeclanche cell

Dnickel iron accumulator

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Question 1327

jamb 2003

Which of the following pairs of light rays show the widest separation in the spectrum of white light

ABlue and red

BGreen and yellow

CIndigo and violet

DOrange and red

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Question 1328

jamb 2003

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

AI and II only

BII and III only

CI, III, and IV only

DII, III and IV only

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Question 1329

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

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Question 1330

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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