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2,483 questions

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Question 731

jamb 2000

A transverse wave is applied to a string whose mass per unit length is 3 x 10-2kgm-1. If the string is under a tension 12N, the speed of the propagation of the wave is

A5 ms^-1

B20 ms^-1

C30 ms^-1

D40 ms^-1

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Question 732

jamb 2000

A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is

Ay = 0.15 sin 200π(x - 5.5t)

By = 0.15 sin π(0.01x - 5.5t)

Cy = 0.15 sin 5.5π(x - 200t)

Dy = 0.15 sin π(550x - 0.01t)

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Question 733

jamb 2000

A sonometer wire is vibrating at frequency fo. If the tension in the wire is doubled while the length and the mass per unit length are kept constant, the new frequency of vibration is

A^f_o/₂

B2f_o

C^f_o/_√2

Df_o√2

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Question 734

jamb 2000

A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum

A4.0 m

B3.0 m

C2.0 m

D1.5 m

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Question 735

jamb 2000

The velocity y of a particle in a time t is given by the equation
y = 10 + 2t\(^2\)
Find the instantaneous acceleration after 5 seconds

A60 ms^-2

B20 ms^-2

C15 ms^-2

D10 ms^-2

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Question 736

jamb 2000

Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is

A1.7V

B2.0V

C8.0V

D15.0V

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Question 737

jamb 2000

A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is

A0.2N

B0.8N

C3.2N

D8.0N

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Question 738

jamb 2000

A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is

A25%

B33%

C50%

D75%

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Question 739

jamb 2000

A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is

A200 Ω

B50 Ω

C100/π Ω

D25/π Ω

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Question 740

jamb 2000

A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are

Abeta rays

Bgamma rays

Cx-rays

Dultra-violet rays

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Question 741

jamb 2000

If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?

A24 years

B20 years

C10 years

D2 years

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Question 742

jamb 2000

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?
[e = 1.6 x 10\(^{19}\)C, h = 6.63 x 10\(^{-34}\)Js]

A6630.0V

B663.0V

C66.3V

D6.6V

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Question 743

jamb 2000

An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is

A80.0W

B40.0W

C10.0W

D0.1W

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Question 744

jamb 2000

A gas would serve as an electrical conductor under

Areduced pressure and high current

Bincreased magnetic field

Creduced pressure and reduced potential

Dexposure to visible light

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Question 745

jamb 2000

In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]

A9.0 x 10^-13J

B9.0 x 10^-12J

C9.0 x 10^-11J

D9.0 x 10^-10J

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Question 746

jamb 2000

In a pure semiconductor, the number of electrons in the conduction band is

Aless than the number of holes in the valence band

Bequal to the number of holes in the valence band

Cgreater than the number of holes in the valence band

Dtwice the number of holes in the valence band

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Question 747

jamb 2000

What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?

ACompound microscope

BGalileo's telescope

CTerrestrial telescope

DAstronomical telescope

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Question 748

jamb 2000

A cell of internal resistance 0.01Ω can be measured accurately using the

AOhm meter

Bmetre bridge

Cpotentiometer

Delectroscope

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Question 749

jamb 2000

An electron of charge 1.6 x 10^-19C and mass 9.1 x 10^-31kg is accelerated between two metal plates with a velocity of 4 x 10⁷ms^-1, the potential difference between the plates is

A4.55 x 10³V

B4.55 x 10²V

C9.10 x 10¹V

D4.55 x 10¹V

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Question 750

jamb 2000

A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?

A0.3m

B3.0m

C3.5m

D4.0m

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