MCQ
Four rods of same material and having the same cross section and length have been joined, as shown. The temperature of the junction of four rods will be ............... $^{\circ} C$
- A$20$
- B$30$
- ✓$45$
- D$60$
✓
Answer
Correct option: C.
$45$
c
(c)
(c)
Incoming heat $=$ outgoing heat
$\left(90^{\circ}-\theta\right)+\left(60^{\circ}-\theta\right)=\theta-30^{\circ}+\theta-0^{\circ}$
$180^{\circ}=4 \theta$
$45^{\circ} C =\theta$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In a rocket, fuel burns at the rate of $2 \,kg / s$. This fuel gets efected from the rocket with a velocity of $80 \,km / s$. Force exerted on the rocket is ............. $N$
→An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close to $.......\%$
→If a ball of steel (density $\rho=7.8 \;gcm ^{-3}$) attains a terminal velocity of $10 \;cms ^{-1}$ when falling in a tank of water (coefficient of viscosity $\eta_{\text {water }}=8.5 \times 10^{-4} \;Pa - s$ ) then its terminal velocity in glycerine $\left(\rho=12 gcm ^{-3}, \eta=13.2\right)$ would be nearly
→In Vander Waal's equation $\left[ {P + \frac{a}{{{V^2}}}} \right]\,(V - b) = RT,$ the dimensions of $a$ are
→A point mass $m$ is placed at the centre of the square $\text{ABCD}$ of side a units as shown below.
The resultant gravitational force on mass $m$ due to masses $m_1$ and $m_2$ plant on the vertices of square is:
→The resultant gravitational force on mass $m$ due to masses $m_1$ and $m_2$ plant on the vertices of square is:
Who proposed the wave theory?
A ball of mass $10\, kg$ is moving with a velocity of $10\, m/s$. It strikes another ball of mass $5\, kg $ which is moving in the same direction with a velocity of $4 \,m/s$. If the collision is elastic, their velocities after the collision will be, respectively
→A particle is projected in a plane perpendicular to a uniform magnetic field. The area bounded by the path described by the particle is proportional to:
In an experiment to find surface tension of mercury with the help of capillary rise method the liquid column in capillary will
A source $X$ of unknown frequency produces $8$ beats per second with a source of $250Hz$ and $12$ beats per second with a source of $270Hz.$ The frequency of the source $X$ is:
→