Question
The maximum possible efficiency of a heat engine is ...........

Answer

(d)

$\eta=1-\frac{T_2}{T_1}$

So it depends on source and sink temperature.

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

Assertion : The number of electrons in a $p-$ type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.
Reason : It is due to law of mass action
A train is moving at a constant speed $V$. When its driver observes another train in front of him on the same track and moving in the same direction with constant speed $u$. If the distance between the trains be $x$, then what should be the minimum retardation of the train so as to avoid collision?
When a $12\,\Omega $ resistor is connected with a moving coil galvanometer then its deflection reduces from $50$ divisions to $10$ divisions. The resistance of the galvanometer is ............. $\Omega $
A ball rolls without slipping.  The radius of gyration of the ball about an axis passing through its centre of mass $K$. If radius of the ball be $R$, then the fraction of total energy associated with its rotational energy will be 
A man of mass $m$ starts falling towards a planet of mass $M$ and radius $R.$ As he reaches near to the surface, he realizes that he will pass through a small hole in the planet. As he enters the hole, he sees that the planet is really made of two pieces a spherical shell of negligible thickness of mass $\frac{2M}{3}$ and a point  mass $\frac{M}{3}$ at the centre. Change in the force of gravity experienced by the man is
A sound wave of frequency $\nu$ travels horizontally to the right. It is reflected from a large vertical plane surface moving to the left with a speed $v.$ The speed of sound in the medium is $c,$ then
In a circuit, current varies with time as $i = 2\sqrt t $ . Root mean square value of current for interval $t = 2\,s$ to $t = 4\,s$ is
In an $a.c.$ circuit the voltage applied is $E=E_o$ $sin$$\omega t$ The resulting current in the circuit is $I=I_osin$$\left( {\omega t - \frac{\pi }{2}} \right)$ .The power consumption in the circuit is given by
The radius of the first (lowest) orbit of the hydrogen atom is ${a_0}.$ The radius of the second (next higher) orbit will be
Match the column $-I$ with column $-II$ For a satellite in circular orbit,

  Column $-I$   Column $-II$
$(A)$ Kinetic energy $(p)$ $ - \frac{{G{M_E}m}}{{2r}}$
$(B)$ Potential energy $(q)$ $\sqrt {\frac{{G{M_E}}}{r}} $
$(C)$ Total energy $(r)$ $ - \frac{{G{M_E}m}}{{r}}$
$(D)$ Orbital energy $(s)$ $ \frac{{G{M_E}m}}{{2r}}$

 (where $M_E$ is the mass of the earth, $m$ is mass of the satellite and $r$ is the radius of the orbit)