MCQ
First law of thermodynamics:
  • A
    Explains temperature.
  • B
    Defines heat
  • C
    Expresses the maximum limit mechanical energy being converted into heat.
  • Expresses the equivalence of heat and mechanical energy.

Answer

Correct option: D.
Expresses the equivalence of heat and mechanical energy.
D

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

If a body of mass $200\, g$ falls from a height $200 \,m$ and its total $P.E.$ is converted into $K.E.$ at the point of contact of the body with earth surface, then what is the decrease in $P.E.$ of the body at the contact $(g = 10\,m/{s^2})$ ............ $\mathrm{J}$
An ideal refrigerator has a freezer at a temperature of $ - 13^\circ C.$ The coefficient of performance of the engine is $5.$ The temperature of the air (to which heat is rejected) will be
A particle is acted simultaneously by mutually perpendicular simple hormonic motions $\text{x}=\text{a}\cos\omega\text{t}\ \text{and}\ \text{y}=\text{a}\sin\omega\text{t}.$ The trajectory of motion of the particle will be:
    A $120\, g$ mass has a velocity $\vec v = 2\hat i + 5\hat j\,m{s^{ - 1}}$ at a certain instant. Its kinetic energy is .................. $\mathrm{J}$
    The bulk modulus and tbe density of water are greater than those of air. With this much of information, we can say that velocity of sound in air:
    1. Is larger than its value in water.
    2. Is smaller than its value in water.
    3. Is equal to its value in water.
    4. Cannot be compared with its value in water.
    $250\,gm$ of water and an equal volume of alcohol of mass $200\,gm$ are placed successively in the same calorimeter and cools from $60^{\circ}\,C$ to $55^{\circ}\,C$ in $130\,sec$ and $67 sec$ respectively. If the water equivalent of the calorimeter is $10\,gm$. , then the specific heat of alcohol in cal/gm $cal / gm ^{\circ}\,C$ is
    A parrot sitting on the floor of a wire cage which is being carried by a boy starts flying. The boy will feel that the box is now:
    The number density of molecules of a gas depends on their distance $r$ from the origin as, $n\left( r \right) = {n_0}{e^{ - \alpha {r^4}}}$. Then the total number of molecules is proportional to
    Aboat having a speed of $5\,\, km/hr$. in still water, crosses a river of width $1\,\, km$ along the shortest possible path in $15 \,\,minutes$. The speed of the river in $Km/hr.$
    A screwgauage has pitch $1.5\;  mm$ and there is no zero error. Linear scale has marking at $MSD = 1\; mm$  and there are $100$ equal division of circular scale. When diameter of a sphere is measured with instrument, main scale is having $2\; mm$ mark visible on linear scale, but $3\; mm$ mark is not visible, $76^{th}$ division of circuler scale is in line with linear scale. .......... $mm$ is the diameter of sphere.