Download App

11. thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
A system is provided with $200 \,cal$ of heat and the work done by the system on the surrounding is $40 \,J$. Then its internal energy
  • A
    Increases by $600 J$
  • B
    Decreases by $800 J$
  • ✓
    Increases by $800 J$
  • D
    Decreases by $50 J$
✓

Answer

Correct option: C.
Increases by $800 J$
c
(c) $\Delta Q = \Delta U + \Delta W$
$\Delta Q = 200cal = 200 \times 4.2 = 840J$ and $\Delta W = 40J$
==>$\Delta U = \Delta Q - \Delta W = 840 - 40 = 800J$

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

Explore more

More "M.C.Q (1 Marks)" from 11. thermodynamics→11. thermodynamics — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A balloon rises from rest with a constant acceleration $g/8$. A stone is released from it when it has risen to height $h$. The time taken by the stone to reach the ground is
→
At atmospheric pressure, water boils at $100^\circ C.$ If pressure is reduced, then:
→
If heat is added at constant volume, $6300\,\,J$ of heat are required to raise the temperature of an ideal gas by $150\,\,K$. If instead, heat is added at constant pressure, $8800$ joules are required for the same temperature change. When the temperature of the gas changes by $300\,\,K$, the internal energy of the gas changes by ..... $J$
→
This question has Statement $1$ and Statement $2.$ Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement $1 :$ An inventor claims to have constructed an engine that has an efficiency of $30\%$ when operated between the boiling and freezing points of water. This is not possible.

Statement $2:$ The efficiency of a real engine is always less than the efficiency of a Carnot engine operating between the same two temperatures.

→
Which of the following is independent of the choice of co-ordinate system
→
A flat plate of area $10\,cm^2$  is separated from a large plate by a layer of glycerine $1\, mm$ thick. If the coefficient of viscosity of glycerine is $20$  poise, the force required to keep the plate moving with a velocity of  $1\,cm/sec$  is .......... $dyne$
→
A body of mass ' ${m}$ ' dropped from a height ' ${h}$ ' reaches the ground with a speed of $0.8 \sqrt{{gh}}$. The value of workdone by the air-friction is $.....\,{mgh}$
→
Three stars $A, B, C$ have surface temperatures $T _{A} ,T _{B}, T _{C}$ respectively. Star $A$ appears bluish, star $B$ appears reddish and star $C$ yellowish. Hence,
→
The angle of contact between glass and water is $0^o$ and it rises in a capillary upto $6$ cm when its surface tension is $70$ dynes/cm. Another liquid of surface tension $140\, dynes/cm$, angle of contact $60^o$ and relative density $2$ will rise in the same capillary by ........ $cm$
→
A hole is drilled in a copper sheet. The diameter of hole is $4.24 \,cm$ at $27.0^{\circ} C$. Diameter of the hole when it is heated to $35^{\circ} C$ is ...........
→