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140 questions

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Question 41

waec 2003

A metal rod of length 100cm is heated through 100ºC, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10\(^{-5}\)K\(^{-1}\)]

A4mm

B3mm

C2mm

D1mm

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Question 42

waec 2003

A platinum resistance thermometer has a resistance 4\(\Omega\) at 0oC and 10\(\Omega\) at 100oC. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45oC.

A14.0\(\Omega\)

B6.7\(\Omega\)

C3.2\(\Omega\)

D2.7\(\Omega\)

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Question 43

waec 2003

Which of the following statements correctly defines a simple machine? a device

Athat can provide electric current

Bwhich can only carry people from one place to another

Cwith which work can be done easily

Dwhich changes the state of rest or of uniform motion of an object along a straight ine

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Question 44

waec 2003

A ball f mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms^-1. Determine the magnitude of the resulting impulse

A2.0kgms^-1

B10.0kgms^-1

C5.0kgms^-1

D2.5kgms^-1

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Question 45

waec 2003

The mass on a loaded spiral spring oscillates vertically between two extreme positions P and R equidistant from the equilibrium position Q. Which of the following statements about the system is not correct

Athe momentum of the mass is maximum at Q

Bthe elastic potential energy of the spring is maximum at Q

Cthe kinetic energy of the mass is maximum at P

Dthe total energy of the system is always constant

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Question 46

waec 2003

The period of an oscillatory motion is defined as the

Aaverage of the time used in completing different numbers of oscillations

Btime to complete a number of oscillations

Ctime to complete one oscillation

Dtime taken to move from one extreme position to another

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Question 47

waec 2003

A moving object is said to have a uniform acceleration if its

Adisplacement decreases at a constant rate

Bspeed is directly proportional with time

Cvelocity increases by equal amount in equal time intervals

Dvelocity varies inversely with time

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Question 48

waec 2003

A force acts on a body for 0.5s changing its momentum from 16.0kg ms^-1 to 21.0kgms^-1, calculate the magnitude of the force

A42.0N

B37.0N

C32.0N

D10.0N

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Question 49

waec 2003

The tendency of a body to remain at rest when a force is supplied to it is called

Aimpulse

Bmomentum

Cinertia

Dfriction

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Question 50

waec 2003

A piece of metal of relative density 5.0 weighs 60N in air. Calculate its weight when fully immersed in water

A4N

B5N

C48N

D60N

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Question 51

waec 2003

A tuber of cassava can be processed into powder. This explains the face that

Amatter can change sponteneously from one state to another

Bmatter cannot be destroyed

Cforce is required to change natter from one state to another

Dmatter is made up of tiny particle

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Question 52

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 53

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 54

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 55

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 56

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 57

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 58

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 59

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 60

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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