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Physics Past Questions and Answers

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Physics Questions

Question 2931:

A wave has an amplitude equal to 4.0m, angular speed \(\frac{1}{3} \pi\) rads^-1 and phase angle \(\frac{2}{3} \pi\) rad. The displacement y of the wave particle is given as

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A Y = 4 sin \(\frac{\pi}{3}\)(t + 2)
B Y = 4 sin \(\frac{\pi}{3}\)(t + \(\frac{2}{\pi}\)
C Y = 4 sin \(\frac{\pi}{3} (2t + 1)\)
D Y = 4 sin \(\frac{\pi}{3} (t + 2)

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Question 2932:

In the diagram above, an incident ray AY makes an angle of 30^o with the normal XY. If the mirror is rotated anticlockwise about Y through an angle of 20^o, while AY is fixed, what angle will the reflected ray now make with the incident ray?

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A 70^o
B 80^o
C 100^o
D 120^o

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Question 2933:

A concave mirror can be used to produce a parallel beam of light if a lighted bulb is placed

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A Between its focus and the pole
B At its focus
C At its centre of curveture
D Between its focus and centre of curvature

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Question 2934:

A simple microscope forms an image 10cm from an eye close to the lens. If the object is 6cm from the eye, calculate the focal length of the lens

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A 3.75cm
B 4.00cm
C 15.00cm
D 16.00cm

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Question 2935:

When white light passes through a triangular glass prism, there is dispersion because of

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A Diffraction of light
B Polarisation of light
C The difference in speed of the components of light
D The interference of light waves in glass

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