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2,483 questions

Question 1 of 20 2,483 total questions

Question 651

jamb 2004

An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is

A1.4A

B1.2A

C12.0A

D14.0A

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Question 652

jamb 2004

A radioisotope has a decay constant of 10\(^{-7}\)s\(^{-1}\). The average life of the radioisotope is

A1.00 x 10⁷s

B6.93 x 10⁶s

C1.00 x 10^-7s

D6.93 x 10⁷s

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Question 653

jamb 2004

A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the

Aarmature coil should be made of silver

Bcommutator should be replaced with slip ring

Ccommutator should be replaced with split rings

Darmature coil should be made of aluminium

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Question 654

jamb 2003

In a fission process, the decrease in mass is 0.01%. How much energy could be obtained from the fission of 0.1g of the material

A\( 9.0 \times 10^{9}J \)

B\( 9.0 \times 10^{10}J \)

C\( 6.3 \times 10^{11}J \)

D\( 9.0 \times 10^{11}J \)

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Question 655

jamb 2003

If the uncertainty in the measurement of the position of a particle is 5.0 x 10-10m, the uncertainty in the momentum of the particle is

A1.32 x 10^-44Ns

B3.30 x 10^-44Ns

C1.32 x 10^-24Ns

D3.30 x 10^-24Ns

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Question 656

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 657

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 658

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 659

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 660

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 661

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 662

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 663

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 664

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 665

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 666

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 667

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 668

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 669

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 670

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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