A rectangular glass block of refractive index 1.5 has an air bubble trapped inside it as shown in the
diagram. When seen from the surface AB, it appears to be 4 cm deep.
A Glass block B
air bubble 15 cm
D C
(a) Calculate the actual depth of the air bubble from the surface AB.
(b) For which colour of light, bluc or yellow, the apparent depth will be greater?
(c) Turning the glass block upside down, DOES NOT change the apparent depth of the air bubble.
State True or False.

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What is the correct energy transformation during burning of a candle?

Copper wire is wound around a steel bar FT. Current is allowed to pass through the coil for some time
and then the bar is removed.
(a) Draw only the magnetised bar FT and mark its poles.
(b) Trace two magnetic lines of force around FT clearly indicating the direction.
F T

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A body is acted upon by two equal and opposite forces, that are NOT along the same straight line. The
body will:

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Which among the following is a vector quantity?

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When a ray of light passes from one optical medium to another, which of the following physical quantities
does NOT change?

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Which one of the following combinations is the correct ascending order of electromagnetic waves in
terms of wavelength?