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Physics Past Questions

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141 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10
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141 questions
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Question 1 of 20 141 total questions
Question 31
waec 2001
If the frequency of the tuning fork at resonance is 256Hz, calculate the frequency of vibration of the wire when the tension in he wire is increased to 196N
A130.6Hz
B182.9Hz
C358.4Hz
D501.8Hz
View Explanation & Discuss
Question 32
waec 2001

The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements about the frequency of vibration of the wire is not correct?

Aproportional to the mass per unit length of the wire
Bequal to the frequency of the tuning fork
Cinversely proportional to the length of the wire
Dproportional to the sqare root of the tension
View Explanation & Discuss
Question 33
waec 2001

The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements is not correct? The wave produced on the wire is

Astationary and lonitudinal
Bstationary and mechanical
Cmechanical and longitudinal
Dprogessive and transverse
View Explanation & Discuss
Question 34
waec 2001

Which of the following statements about sound is correct?

Awhen sound travels from air to a denser medium, it is refracted away from the normal at the point of incidence
Bsound travels faster in air than in water
Cthe wavelength of sound changes when it travels from to water
Dthe frequency of it travels from air to water
View Explanation & Discuss
Question 35
waec 2001

Dispersion of white light by a glass prism occurs because

Awhite light consist of a mixture of seven different colour
Bthe refractive index of glass is different from each constituent colour of white light
Cthe speed of each colour of light in the glass is proportional to the refractive index of glass for each colour
Dthe speed of each colour of light in the glass is proportional to the angle of refraction in he prism
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Question 36
waec 2001

A piece of cloth appears green in sunlight. When held in red light, it will appear

Agreen
Bblue
Cred
Dblack
View Explanation & Discuss
Question 37
waec 2001
An object is placed 20cm from a lens. If an image is formed on a screen 260cm away from the lens, calculate the magnification of the image
A28
B26
C24
D13
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Question 38
waec 2001

Convex spherical mirrors are preferred to plane mirrors as driving mirrors because

Athe image produce is upright and clearly visible
Bit provides a wider field of view
Cthe image produce is errect and diminished
Dthe image produced is not laterally inverted
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Question 39
waec 2001

An incident ray is reflected normally by a plane mirror onto a screen where it forms a bright spot. The mirror and screen are parallel and 1m apart. If the mirror is rotated through 5º, calculate the displacement of the spot

A8.7cm
B10.0cm
C15.4cm
D17.6cm
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Question 40
waec 2001
Surface waves travelling in deep water at 15ms-1 are incident at a shallow water boundary. If the angles of incidence and refraction are 45o and 30o respectively. Calculate the speed of the waves in shallow water
A8.1ms-1
B10.0ms-1
C10.6ms-1
D22.5ms-1
View Explanation & Discuss
Question 41
waec 2001

Humidity is used to describe the amount of

Aair in water vapour
Bcloud available in the atmosphere
Cair in equal volume of cloud
Dwater vapour in the amosphere
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Question 42
waec 2001

Which of the following physical qualities affects the saturated vapour pressure of a liquid ?

Atemperature
Bvolume
Cmass
Ddensity
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Question 43
waec 2001

The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as

Alatent heat
Bheat capacity
Cspecific latent heat
Dspecific heat capacity
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Question 44
waec 2001

The volume of an ideal gas at a pressure of 77 cmHg and a temperature of 60 °C is 240 cm\(^3\). If the temperature and pressure are increased to 98oC
and 81cmHg respectively, calculate the new volume of the gas

A411.5cm3
B267.1cm3
C254.2cm3
D112.7cm3
View Explanation & Discuss
Question 45
waec 2001

A given mass of an ideal gas has a pressure of 500Nm-2 at -13ºC. If its volume remains constant. Calculate its pressure at 247ºC.

A25Nm-2
B50Nm-2
C500Nm-2
D1000Nm-2
View Explanation & Discuss
Question 46
waec 2001
A resistance thermometer has a resistance of 20\(\Omega\) at 0oC and 85\(\Omega\) at 100oC. If its resistance is 52\(\Omega\)in a medium, calculate the corresponding temperature
A49.2oC
B60.6oC
C80.0oC
D84.7oC
View Explanation & Discuss
Question 47
waec 2001
a beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]
A32.0N
B26.7N
C16.0N
D13.3N
View Explanation & Discuss
Question 48
waec 2001
A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [\(\pi = 3.142\)]
A21
B38
C48
D151
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Question 49
waec 2001
A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine
A10.0
B13.3
C17.5
D25.0
View Explanation & Discuss
Question 50
waec 2001

Electrical resistance is a property of an electrical energy to be converted into

Amechanical energy
Bheat energy
Cmagnetic energy
Dchemical energy
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