Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answers only.)
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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What is the correct energy transformation during burning of a candle?

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

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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?

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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For a lever, a graph is plotted with load on Y-axis and effort on X-axis. Which of the following represents
the slope of the graph?
(a) Mechanical advantage (b) Velocity ratio
1 1
(c) (d)
Velocity ratio Mechanical advantage