COMEDK · Physics · 12. Thermal Properties of Matter
A compound slab is made of two parallel plates of copper and brass of the same thickness and having thermal conductivities in the ratio \(4: 1\). The free face of copper is at \(0^{\circ} \mathrm{C}\). The temperature of the interface is \(20^{\circ} \mathrm{C}\). What is the temperature of the free face of brass?
- A \(0^{\circ} \mathrm{C}\)
- B \(20^{\circ} \mathrm{C}\)
- C \(40^{\circ} \mathrm{C}\)
- D \(100^{\circ} \mathrm{C}\)
Answer & Solution
Correct Answer
(D) \(100^{\circ} \mathrm{C}\)
Step-by-step Solution
Detailed explanation
Given, \(K_{\text {copper }}: K_{\text {brass }}=4: 1\) \[ \Rightarrow \quad \frac{K_{\text {copper }}}{K_{\text {brass }}}=\frac{4}{1} \] Let the temperature of the free surface of brass \(=\theta\) Rate of flow of heat will be equal in both the plates as connected in series.…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is \(2 \%\) of the frequency of the source. If the speed of sound in air is \(300 \mathrm{~ms}^{-1}\), then the velocity of the source isCOMEDK 2019 Hard
- A bar magnet of length 12 cm is placed such that its north pole points towards the geographic north. Two neutral points which are separated by 16 cm are obtained on the equatorial axis of the bar magnet. What is the pole strength of the bar magnet if the horizontal component of the earth's field is \(1.25 \times 10^{-5}\ T\)?COMEDK 2026 Medium
- The normal magnetic flux passing through a coil changes with time according to the equation \(\phi=6 t^{2}-5 t+1\). What is the magnitude of the induced current at \(t=0.253 \mathrm{~s}\) and resistance \(10 \Omega\) ?COMEDK 2014 Medium
- A magnet \(N-S\) is suspended from a spring and when it oscillates, the magnet moves in and out of the coil \(C\). The coil is connected to a galvanometer \(G\), then as the magnet oscillates
COMEDK 2013 Easy - A negative charge particle is moving upward in a magnetic field which is towards north. The particle is deflected towardsCOMEDK 2024 Easy
- A glass hemisphere of radius \(0.1 \mathrm{~cm}\) and refractive index \(1.5\) is placed over a spot on a table and the spot is viewed from above. The spot appears to be
COMEDK 2012 Hard
More PYQs from COMEDK
- The maximum number of hydrogen bonds that a molecule of water can have isCOMEDK 2017 Medium
- An LCR series ac circuit is at resonance with 10 V each across \(\mathrm{L}, \mathrm{C}\) and R. If the resistance is halved, the respective voltage across \(\mathrm{R}, \mathrm{C}\) and L areCOMEDK 2025 Medium
- Which of the following alkene on reductive ozonolysis gives ketones only as the product?COMEDK 2025 Medium
- Let \(a\) and \(b\) be non-zero real such that \(a \neq b\).
Then, the equation of the line passing through the origin and the point of intersection of \(\frac{x}{a}+\frac{y}{b}=1\) and \(\frac{x}{b}+\frac{y}{a}=1\) isCOMEDK 2015 Medium - An object of height \(h\) is placed midway between \(f\) and \(2 f\) in front of a biconvex lens. A real inverted image is captured on a screen placed a little beyond \(2 f\) on the other side of the lens. If the whole arrangement is immersed in water without disturbing the object, lens and the screen positions, then the new image formed will beCOMEDK 2025 Medium
- If \(x = a(\theta - \sin\theta)\) and \(y = a(1 - \cos\theta)\), then \(\dfrac{(1 + y_1^2)^{3/2}}{y_2} =\)COMEDK 2026 Medium