Physics Past Questions

Question 591

waec 2001

Three identical lamps each power 100W are connected in parallel across a potential difference of 250V. Calculate the current in the circuit

A7.5A

B2.5A

C1.2A

D0.8A

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Question 592

waec 2001

What is the total energy stored by the capacitors?

A2.0 x 10^-4J

B1.0 x 10^-4J

C9.0 x 10^-2J

D1.0 x 10^-2J

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Question 593

waec 2001

What is the effective capacitance in the circuit?

A2\(\mu F\)

B6\(\mu F\)

C18\(\mu F\)

D216\(\mu F\)

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Question 594

waec 2001

As the plates of a charged variable capacitor are moved closer together, the potential difference between them

Aincreased

Bdecrease

Cremains the same

Dis doubled

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Question 595

waec 2001

The magnitude of the gravitational force between two particles 0.10m apart is 10N. If the distance between them is increased to 0.20m, calculate the magnitude of the new force

A40.0N

B20.0N

C5.0N

D2.5N

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Question 596

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

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Question 597

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

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Question 598

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

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Question 599

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

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Question 600

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 601

waec 2001

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

Agreen

Bblue

Cred

Dblack

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Question 602

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 603

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 604

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 605

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 45^o and 30^o respectively. Calculate the speed of the waves in shallow water

A8.1ms^-1

B10.0ms^-1

C10.6ms^-1

D22.5ms^-1

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Question 606

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 607

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 608

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 609

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

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Question 610

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

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