JEE Mains · Physics · STD 11 - 10.2 transmission of heat
A bowl filled with very hot soup cools from \(98^{\circ}\,C\) to \(86^{\circ}\,C\) in \(2\) minutes when the room temperature is \(22^{\circ}\,C\). \(..........\,minutes\) long it will take to cool from \(75^{\circ}\,C\) to \(69^{\circ}\,C\) ?
- A \(2\)
- B \(1.4\)
- C \(0.5\)
- D \(1\)
Answer & Solution
Correct Answer
(B) \(1.4\)
Step-by-step Solution
Detailed explanation
\(\frac{\Delta Q }{\Delta t }=- K \left( T - T _0\right)\) \(\frac{\Delta Q }{\Delta t }=- K \left( T _{ avg }- T _0\right)\) \((i)\) \(\frac{ ms \times 12}{2}=- K \left(\frac{98+86}{2}-22\right)\) \(6=-\frac{ K }{ ms }\left[\frac{98+86}{2}-22\right]\)…
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
- A capacitor is made of two square plates each of side \(a\) making a very small angle \(\alpha\) between them, as shown in figure. The capacitance will be close to
JEE Mains 2020 Hard - A nucleus with mass number \(184\) initially at rest emits an \(\alpha\)-particle. If the \(Q\) value of the reaction is \(5.5\, {MeV}\), calculate the kinetic energy of the \(\alpha-\) particle. (In \({MeV}\))JEE Mains 2021 Hard
- In a metre-bridge when a resistance in the left gap is \(2\ \Omega\) and unknown resistance in the right gap, the balance length is found to be \(40\ \mathrm{cm}\). On shunting the unknown resistance with \(2\ \Omega\), the balance length changes by _______.JEE Mains 2024 Hard
- A particle is moving in a straight line such that its velocity is increasing at \(5\,ms ^{-1}\) per meter. The acceleration of the particle is \(ms ^{-2}\) at a point where its velocity is \(20\,ms ^{-1}\).JEE Mains 2022 Medium
- Match the LIST-I with LIST-II.
LIST-I LIST-II (A) \(_0^1n + _{92}^{235}U \rightarrow _{54}^{140}Xe + _{38}^{94}Sr + 2_0^1n\) (I) Chemical reaction (B) \(2H_2 + O_2 \rightarrow 2H_2O\) (II) Fusion with +ve Q value (C) \(_1^2H + _1^2H \rightarrow _2^3He + _0^1n\) (III) Fission (D) \(_1^1H + _1^3H \rightarrow _1^2H + _1^2H\) (IV) Fusion with -ve Q value
Choose the correct answer from the options given below :JEE Mains 2025 Medium - If the distance of the earth from Sun is \(1.5 \times 10^6\,km\). Then the distance of an imaginary planet from Sun, if its period of revolution is \(2.83\) years is \(.............\times 10^6\,km\)JEE Mains 2023 Medium
More PYQs from JEE Mains
- The energy associated with electric field is \((U_E)\) and with magnetic field is \((U_B)\) for an electromagnetic wave in free space. ThenJEE Mains 2019 Medium
- Given below are two statements: Statement \(I\): An \(AC\) circuit undergoes electrical resonance if it contains either a capacitor or an inductor. Statement \(II\): An \(AC\) circuit containing a pure capacitor or a pure inductor consumes high power due to its non-zero power factor. In the light of above statements, choose the correct answer from the options given belowJEE Mains 2023 Medium
- A water drop of radius \(1\,cm\) is broken into \(729\) equal droplets. If surface tension of water is \(75\,dyne / cm\), then the gain in surface energy upto first decimal place will be\(...\times 10^{-4}\,J\)JEE Mains 2022 Medium
- Electric charge is transferred to an irregular metallic disk as shown in figure. If \(\sigma_1, \sigma_2, \sigma_3\) and \(\sigma_4\) are charge densities at given points then, choose the correct answer from the options given below:
JEE Mains 2025 Medium - If a function \(f(x)\) defined by \(f(x)=\left\{\begin{array}{ll}a e^{x}+b e^{-x}, & -1 \leq x<1 \\ c x^{2}, & 1 \leq x \leq 3 \\ a x^{2}+2 c x, & 3 < x \leq 4\end{array}\right.\) be continuous for some \(a, b, c \in R\) and \(f ^{\prime}(0)+ f ^{\prime}(2)= e ,\) then the value of of \(a\) isJEE Mains 2020 Hard
- In the expansion of \(\left(9x-\dfrac{1}{3\sqrt{x}}\right)^{18}\), \(x>0\), if the term independent of \(x\) is \((221)k\), then \(k\) is equal to:JEE Mains 2026 Medium