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Practice each question, then open the answer or worked solution.
A bimetallic strip is made of aluminium and steel (αAl > αsteel). On heating, the strip will
a) remain straight
b) get twisted
c) will bend with aluminium on the concave side
d) will bend with steel on the concave side
The correct answer is d) will bend with steel on the concave side
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 the same
d) its speed increases because its moment of inertia increases
The correct answer is b) its speed of rotation decreases
The graph between two temperature scales A and B is shown in the figure. Between upper fixed point and the lower fixed point, there are 150 equal division on scale A and 100 on scale B. The relationship for conversion between the two scales is given by
a)
b)
c)
d)
The correct answer is
b)
An aluminium sphere is dipped into water. Which of the following is true?
The correct answer is a) buoyancy will be less in water at 0oC than that in water at 4oC
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 the centre of mass below the centre of the bob
d) decreases as its effective length remains the same but the centre of mass shifts above the centre of the bob
The correct answer is a) increase as its effective length increases even though its centre of mass still remains at the centre of the bob
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
The correct answer is a) kinetic energy of random motion of molecules
The radius of a metal sphere at room temperature T is R, and the coefficient of linear expansion of the metal is α. The sphere is heated a little by a temperature ∆T so that its new Temperature is T + ∆T. The increase in the volume of the sphere is approximately
a)
b)
c)
d)
The correct answer is
d)
A sphere, a cube, and a thin circular plate, all of the same material and same mass are initially heated to same high temperature.
a) plate will cool fastest and cube the slowest
b) sphere will cool fastest and cube the slowest
c) plate will cool fastest and sphere the slowest
d) cube will cool fastest and plate the slowest
The correct answer is c) plate will cool fastest and sphere the slowest
Multiple Choice Questions IIMark the correct options:
The correct answers are
b) A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z are not in thermal equilibrium with each other
d) A system X is neither in thermal equilibrium with Y nor with Z. The system Y and Z may be in thermal equilibrium with each other
‘Gulab Jamuns’ (assumed to be spherical) are to be heated in an oven. They are available in two sizes, one twice bigger than the other. Pizzas (assumed to be discs) are also to be heated in the oven. They are also in two sizes, one twice big in radius than the other. All four are put together to be heated to oven temperature. Choose the correct option from the following:
The correct answers are
b) smaller gulab jamuns are heated before bigger ones
c) smaller pizzas are heated before bigger ones