KCET · Physics · Rotational Motion
The efficiency of a Carnot engine which operates between the two temperatures \( T_{1}=500 \mathrm{~K} \)
and \( T_{2}=300 \mathrm{~K} \) is
- A \( 50 \% \)
- B 1) \( 25 \% \)
- C \( 75 \% \)
- D \( 40 \% \)
Answer & Solution
Correct Answer
(D) \( 40 \% \)
Step-by-step Solution
Detailed explanation
Efficiency, \( \eta=\left(1-\frac{T_{2}}{T_{1}}\right) \times 100 \% \)
Given \( T_{1}=500 ; T_{2}=300 \mathrm{~K} \)
Therefore,
\( \eta=\left(1-\frac{300}{500}\right) \times 100=\frac{200}{500} \times 100=40 \% \)
Given \( T_{1}=500 ; T_{2}=300 \mathrm{~K} \)
Therefore,
\( \eta=\left(1-\frac{300}{500}\right) \times 100=\frac{200}{500} \times 100=40 \% \)
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
- In an experiment to determine the figure of merit of a galvanometer by half deflection method, a student constructed the following circuit.
He unplugged a resistance of \(5200 \Omega\) in R . When \(\mathrm{K}_1\) is closed and \(\mathrm{K}_2\) is open, the deflection observed in the galvanometer is 26 div. When \(K_2\) is also closed and a resistance of \(90 \Omega\) is removed in S , the deflection between 13 div. The resistance of galvanometer is nearlyKCET 2025 Medium - In Young's double slit experiment, the distance between the slits and the screen is \(1.2 \mathrm{~m}\) and the distance between the two slits is \(2.4 \mathrm{~mm}\). If a thin transparent mica sheet of thickness \(1 \mu \mathrm{m}\) and RI \(1.5\) is introduced between one of the interfering beams, the shift in the position of central bright fringe isKCET 2020 Easy
- When electron jumps from \( n=4 \) level to \( n=1 \) level, the angular momentum of electron
changes byKCET 2016 Easy - A convex lens has power \(P\). It is cut into two halves along its principal axis. Further one piece (out of two halves) is cut into two halves perpendicular to the principal axis as shown in figure. Choose the incorrect option for the reported lens pieces
KCET 2025 Medium - If there is no torsion in the suspension thread, then the time period of a magnet executing SHM isKCET 2015 Hard
- Two identical circular current loops carrying equal currents are placed with their axes inclined at \(45^\circ\) to each other as shown in the figure. The resultant magnetic field at P is
KCET 2026 Hard
More PYQs from KCET
- An electric dipole with dipole moment \(4 \times 10^{-19} \mathrm{C}-\mathrm{m}\) is aligned at \(30^{\circ}\) with the direction of a uniform electric field of magnitude \(5 \times 10^4 \mathrm{NC}^{-1}\), the magnitude of the torque acting on the dipole isKCET 2022 Medium
- Consider the following statements in case of Young's double slit experiment.
(1) A slit \(S\) is necessary if we use an ordinary extended source of light.
(2) A slit \(S\) is not needed if we use an ordinary but well collimated beam of light.
(3) A slit \(S\) is not needed if we use a spatially coherent source of light.
Which of the above statements are correct?KCET 2011 Easy - Amphoteric oxide among the following .KCET 2022 Easy
- In a dihybrid cross between a true breeding round yellow seeded and true breeding wrinkled green seeded pea plant, the ratio of segregation of round and wrinkled seed traits in F2 isKCET 2024 Easy
- If \(n\) is even and the middle term in the expansion of \(\left(x^2+\frac{1}{x}\right)^n\) is \(924 x^6\), then \(n\) is equal toKCET 2023 Easy
- A substance of mass \( 49.53 \mathrm{~g} \) occupies \( 1.5 \mathrm{~cm}^{3} \) of volume. The density of the substance (in \( \mathrm{g} \) \( \left.\mathrm{cm}^{-3}\right) \) with correct number of significant figures isKCET 2017 Easy