Download App

10.2 , transmission of heat — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics10.2 , transmission of heat1 Mark
MCQ
In a room where the temperature is ${30^o}C$, a body cools from ${61^o}C$ to ${59^o}C$ in $4$ minutes. The time (in min.) taken by the body to cool from ${51^0}C$ to ${49^0}C$ will be ....... $\min$
  • A
    $4$
  • ✓
    $6$
  • C
    $5$
  • D
    $8$
✓

Answer

Correct option: B.
$6$
b
(b) First case, $\frac{{61 - 59}}{4} = K\left[ {\frac{{61 + 59}}{2} - 30} \right]$…..$(i)$

Second case, $\frac{{51 - 49}}{t} = K\left[ {\frac{{51 + 49}}{2} - 30} \right]$ …..$(ii)$

By solving equation $(i)$ and $(ii)$ we get

$t = 6 min$ .

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 10.2 , transmission of heat→10.2 , transmission of heat — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

If the external forces acting on a system have zero resultant, the centre of mass:
→
A perfect gas at $27^\circ C$ is heated at constant pressure to $327^\circ C$. If original volume of gas at $27^\circ C$ is $V$ then volume at $327^\circ C$ is
→
The excess pressure due to surface tension in a spherical liquid drop of radius r is directly proportional to
→
In a system of particles, internal forces can change (for the system)
→
The displacement of a particle is represented by the equation $\text{y}=\sin^3\omega\text{t}.$ The motion is:
→
The image of an extended object, placed perpendicular to the principal axis of a mirror, will be erect if:
  1. The object and the image are both real.
  2. The object and the image are both virtual.
  3. The object is real but the image is virtual.
  4. The object is virtual but the image is real.
→
If a cavity is made inside a solid sphere, Then the gravitational field inside the cavity is
→
Two closed organ pipes of length $100\,cm$ and $101\,cm$ long give $16$ beats in $20\,sec$ when each pipe is sounded in fundamental mode. Calculate velocity of sound .... $ms^{-1}$
→
Young's moduli of the material of wires $A$ and $B$ are in the ratio of $1: 4$, while its area of cross sections are in the ratio of $1: 3$. If the same amount of load is applied to both the wires, the amount of elongation produced in the wires $A$ and $B$ will be in the ratio of

[Assume length of wires $A$ and $B$ are same]

→
The temperature of an ideal gas is increased from $120\, K$ to $480\, K.$ If at $120\, K,$ the root mean square velocity of the gas molecules is $v,$ at $480\, K$ it becomes
→