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4,719 questions

Question 1 of 20 4,719 total questions

Question 1961

jamb 1991

The internal resistance of each of the cells E\(^1\) and E\(^2\), shown in the figure above, is 2 Ohms. Calculate the total current in the circuit

A0.80A

B0.50A

C0.40A

D0.004A

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Question 1962

jamb 1991

A body is under action of a force F such that the force displacement graph of the body is semi circular as shown above. The work done on the body by the force in moving through 24 meters is

A36π J

B72π J

C144π J

D288π J

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Question 1963

jamb 1991

Find the tension T\(_1\) in the diagram above if the system is in equilibrium [G = 10ms\(^{-2}\)]

A200/√3N

B100/√3N

C300/√3N

D100N

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Question 1964

jamb 1991

Which of the following phenomena is called photoelectric effect?

Ahigh energy electrons impinge on a metalic anode which then emits photons

Ba high energy photon emits photons as it slowed down

Ca metal absorbs quanta of light and then emits electrons

DTwo electrons are created from a quantum of light

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Question 1965

jamb 1991

Which of the following are True for \(\alpha\)-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change.

Ai and ii only

Bii and iii only

Ci and iii only

Di, ii, and iii only

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Question 1966

jamb 1991

In a nuclear fusion process, four protons each of mass Mp were fused to produce a nucleus X of mass Mx. Which of the following equations is CORRECT?

A4M_p > M_x

B4M_p = M_x

C4M_p < M_x

DM_p > M_x

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Question 1967

jamb 1991

4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?

A1\(\frac{1}{4}\) days

B8\(\frac{1}{4}\) days

C30 days

D80 days

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Question 1968

jamb 1991

When an atom loses or gains a charge, it becomes

Aan electron

Ban ion

Ca neutron

Da proton

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Question 1969

jamb 1991

which of the following statements are TRUE of isotopes? i. isotopes of an element have the same chemical properties because they have the same number of electrons. ii. isotopes of elements are normally separated using physical properties. iii. isotopes of an element have the same number of protons in their nuclei.

Ai and ii only

Bi and iii only

Cii and iii only

Di, ii, and iii

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Question 1970

jamb 1991

The electrochemical equivalent of platinum is 5.0 x 10^-7kgC^-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for

A5.6 hours

B56 hours

C1.4 x 10^{4 hours}

D2.0 x 10^{4 hours}

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Question 1971

jamb 1991

If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes

Ainductance

Beddy currents

Celecro-magnetism

Ddipole moment

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Question 1972

jamb 1991

To convert an alternating current dynamo into a direct current dynamo, the

Anumber of turns in the coil is increased

Bstrength of the field magnet is increased

Cslip rings are replaced with a split ring commutator

Dcoil is wound on a soft iron armature

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Question 1973

jamb 1991

An equipment whose power is 1500W and resistance is 375 ohms would draw a current of

A0.10A

B2.00A

C4.00A

D77.5A

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Question 1974

jamb 1991

Which of the following obeys Ohm's Law?

AGlass

BDiode

CAll electrolytes

DAll metals

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Question 1975

jamb 1991

A moving coil galvanometer of 300\(\Omega\) resistance gives full scale deflection for 1.0mA. The resistance R, of the shunt that is required to convert the galvanometer into a 3.0A ammeter is

A899.70\(\Omega\)

B10.00\(\Omega\)

C0.10\(\Omega\)

D0.01\(\Omega\)

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Question 1976

jamb 1991

The function of the system of granulated carbon mixed with manganese (IV) oxide in a Letanche cell is to

Aincrease the e.m.f. of the cell to 2.0V

Bprevent local action in the cell

Cprevent polarisation in the cell

Dmake the cell black and hence a good radiator

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Question 1977

jamb 1991

An insulated rod when rubbed with a material acquires

Aa negative charge if it is made of glass and rubbed with silk

Bno charge if it is made of glass and rubbed with fur

Cno charge if it is made of copper and rubbed with silk

Da positive charge if it is made of copper and rubbed with fur

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Question 1978

jamb 1991

Which of the following statements is CORRECT about the earth's magnetic field?

Athe angle of dip is the angle which a freely suspended magnet makes with the vertical

Bthe angle of declination is the angle between the magnetic meridian and the geographic meridian

Cthe angle of declination is the angle which a magnetic compass makes with the magnetic meridian

Dthe angle of inclination is the difference between the angle of dip and the angle of declination

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Question 1979

jamb 1991

When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as

Abeats

Bechoing

Cresonance

Dreverberation

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Question 1980

jamb 1991

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?

A330.0m

B335.4m

C660.0m

D670.8m

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