Question
Assertion : Thermocouple acts as a heat engine.
Reason : When two junctions of thermocouple are at different temperature, thermo e.m.f. is produced.

Answer

(b) Here reason is not the correct explanation of the assertion, which is correct.

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 : lt is not possible for a system, unaided by an external agency to transfer heat from a body at lower temperature to another body at higher temperature.
Reason : According to Clausius statement, "No process is possible whose sole result is the transfer of heat from a cooled object to a hotter object.
Assertion : A transistor amplifier in common emitter configuration has a low input impedence.
Reason : The base to emitter region is forward biased.
Assertion : lt is better to wash the clothes in cold soap solution.
Reason : The surface tension of cold solution is more than the surface tension of hot solution.
Assertion : paper pins are made to have pointed end.
Reason $\quad:$ Because pointed pins have very smalll area due to which even for small applied force it exert large pressure on the surface.
Assertion : The periodic time of a hard spring is less as compared to that of a soft spring.
Reason : The periodic time depends upon the spring constant, and spring constant is large for hard spring.
Assertion : Electromagnets are made of soft iron.
Reason : Coercivity of soft iron is small.
Assertion : Air quickly leaking out of a balloon becomes coolers
Reason : The leaking air undergoes adiabatic expansion.
Assertion : The refractive index of diamond is $\sqrt{6}$ and that of liquid is $\sqrt{3}$. If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is 30 .
Reason : $\mu=\frac{1}{\sin C}$, where $\mu$ is the refractive index of diamond with respect to liquid.
Assertion : The $200 W$ bulbs glows with more brightness then $100 W$ bulbs.
Reason : A $100 W$ bulb has more resistance than a $200 W$ bulb.
Assertion : In isothermal process whole of the heat energy supplied to the body is converted into internal energy.
Reason : According to the first law of thermodynamics $\Delta Q=\Delta U+p \Delta V$