Exam (elaborations)
Chapter Eleven THERMAL PROPERTIES OF MATTER
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Chapter Eleven THERMAL PROPERTIES OF MATTER
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Chapter ElevenTHERMAL
PROPERTIES OF
MATTER
MCQ I
11.1 A bimetallic strip is made of aluminium and steel (α Al > α steel ) .
On heating, the strip will
(a) remain straight.
(b) get twisted.
(c) will bend with aluminium on concave side.
(d) will bend with steel on concave side.
11.2 A uniform metallic rod rotates about its perpendicular bisector
with constant angular speed. If it is heated uniformly to raise its
temperature slightly
(a) its speed of rotation increases.
(b) its speed of rotation decreases.
(c) its speed of rotation remains same.
(d) its speed increases because its moment of inertia increases.
11.3 The graph between two temperature scales A and B is shown in
Fig. 11.1. Between upper fixed point and lower fixed point there
20/04/2018
, Exemplar Problems–Physics
are 150 equal division on scale A and 100 on scale B.
The relationship for conversion between the two scales
is given by
t A − 180 t
(a) = B
100 150
t A − 30 t
(b) = B
150 100
t B − 180 t
(c) = A
150 100
t B − 40 t
(d) = A
100 180
Fig. 11.1
11.4 An aluminium sphere is dipped into water. Which of the following
is true?
(a) Buoyancy will be less in water at 0°C than that in water at
4°C.
(b) Buoyancy will be more in water at 0°C than that in water at
4°C.
(c) Buoyancy in water at 0°C will be same as that in water at
4°C.
(d) Buoyancy may be more or less in water at 4°C depending on
the radius of the sphere.
11.5 As the temperature is increased, the time period of a pendulum
(a) increases as its effective length increases even though its centre
of mass still remains at the centre of the bob.
(b) decreases as its effective length increases even though its centre
of mass still remains at the centre of the bob.
(c) increases as its effective length increases due to shifting of
centre of mass below the centre of the bob.
(d) decreases as its effective length remains same but the centre
of mass shifts above the centre of the bob.
11.6 Heat is associated with
(a) kinetic energy of random motion of molecules.
(b) kinetic energy of orderly motion of molecules.
(c) total kinetic energy of random and orderly motion of
molecules.
(d) kinetic energy of random motion in some cases and kinetic
energy of orderly motion in other.
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