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6
MCQ (Single Correct Answer)

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
7
MCQ (Single Correct Answer)

The radius of a metal sphere at room temperature $T$ is $R$ and the coefficient of linear expansion of the metal is $\alpha$. The sphere heated a little by a temperature $\Delta T$ so that its new temperature is $T+\Delta T$. The increase in the volume of the sphere is approximately.

A
$2 \pi R \alpha \Delta T$
B
$\pi R^2 \alpha \Delta T$
C
$4 \pi R^3 \alpha \Delta T / 3$
D
$4 \pi R^3 \alpha \Delta T$
8
MCQ (Single Correct Answer)

A sphere, a cube and a thin circular plate, all of 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
9
MCQ (Multiple Correct Answer)

Mark the correct options

A
A system $X$ is in thermal equilibrium with $Y$ but not with $Z$. The systems $Y$ and $Z$ may be in thermal equilibrium with each other.
B
A system $X$ is in thermal equilibrium with $Y$ but not with $Z$. The systems $Y$ and $Z$ are not in thermal equilibrium with each other.
C
A system $X$ is neither in thermal equilibrium with $Y$ nor with $Z$. The systems $Y$ and $Z$ must be in thermal equilibrium with each other.
D
A system $X$ is neither in thermal equilibrium with $Y$ nor with $Z$. The systems $Y$ and $Z$ may be in thermal equilibrium with each other.
10
MCQ (Multiple Correct Answer)

Gulab namuns (assumed to be spherical) are to be heated in an oven. They are available in two sizes, one twice bigger (in radius) than the other. Pizzas (assumed to be discs) are also to be heated in oven. They are also in two sizes, one twice bigger (in radius) than the other. All four are put together to be heated to oven temperature. Choose the correct option from the following.

A
Both size gulab jamuns will get heated in the same time
B
Smaller gulab jamuns are heated before bigger ones
C
Smaller pizzas are heated before bigger ones
D
Bigger pizzas are heated before smaller
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