MCQ
On giving 120 joules of heat to a gas, its internal energy increases by 50 joules. The external work done is:
  • A
    170 joules
  • B
    50 joules
  • C
    120 joules
  • 70 joules

Answer

Correct option: D.
70 joules
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

A large tank filled with water to a height ‘h’ is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from $ h$  to $\frac{h}{2}$ and from $\frac{h}{2}$ to zero is
One mole of a monoatomic ideal gas is expanded by a process described by $p V^3=C$, where $C$ is a constant. The heat capacity of the gas during the process is given by ( $R$ is the gas constant)
A pendulume clock loses $12\;s$ a day if the temperature is $40^oC$ and gains $4\;s$ a day if the temperature is $20^oC$. The temperature at which the clock will show correct time, and the coeffecient of linear expansion $(\alpha)$ of the metal of the pendulum shaft are respectively
A scooter going due east at $10\, ms^{-1}$ turns right through an angle of $90^°$. If the speed of the scooter remains unchanged in taking turn, the change is the velocity of the scooter is
The kinetic energy per gm mol for a diatomic gas at room temperature is
$KE$ of a body is increased by $44 \%$. What is the percent increase in the momentum is ...... $\%$
When $1\, N$ force acts on $1 \,kg$ body that is able to move freely, the body receives
The earth is assumed to be a sphere of radius $R.$ A platform is arranged at a height $R$ from the surface of the earth. The escape velocity of a body from this platform is $fv$, where $v$ is its escape velocity from the surface of the Earth. The value of $f$ is
Two identical wires of rubber and iron are stretched by the same weight, then the number of atoms in the iron wire will be
A body is projected vertically up with a speed $v_0$ in gravity. The average speed of the  body over a time $\frac{v_0}{g}$ calculated from the instant of projection is