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2,483 questions

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Question 911

jamb 1992

In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the

Aload and the extension

Bload and the radius of the wire

Cradius of the wire and the extension

Dextension and the original length of the wire

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Question 912

jamb 1992

A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

A80%

B75%

C50%

D33%

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Question 913

jamb 1992

A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?

A667W

B810W

C960W

D15000W

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Question 914

jamb 1992

A stone, Q is thrown with velocity U at an angle of 75^o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15^o to the horizontal. The ranges covered by the stones will be

Agreater for Q

Bgreater for R

Cthe same for Q and R

Dgreater for the heavier of the two stones

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Question 915

jamb 1992

A body starts from rest and moves with a uniform acceleration of 6 ms \(^{-2}\). What distance does it cover in the third seconds

A15m

B18m

C27m

D30m

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Question 916

jamb 1992

A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

Ain front of his palm

Bbehind his palm

Cbeside his palm

Dinto his palm

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Question 917

jamb 1992

Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.

Ai, ii, and iii

Bii and iii only

Ci and iii only

Di and ii only

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Question 918

jamb 1992

What is the least possible error in using a rule graduated in centimeters?

A0.1cm

B0.5cm

C1.0cm

D2.0cm

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Question 919

jamb 1991

In the above circuit, The fuse wire melts when

AK is Opened

BK is closed

Cthe 14 ohm resistor is doubled with k closed

Dthe 6 ohm resistor is doubled with k closed

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Question 920

jamb 1991

The net capacitance of the circuit shown above is

A8.0µF

B6.0µF

C4.0µF

D2.0µF

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Question 921

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 922

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 923

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 924

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 925

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 926

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 927

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 928

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 929

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 930

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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