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Previous year questions with solutions · 2000 – 2026
| Year | Questions | Papers | Avg / paper | Weightage |
|---|---|---|---|---|
| 2026 | 1 | 2 | 0.5 | 1.11% ↓50% |
| 2025 | 1 | 1 | 1 | 2.22% ↑11.1% |
| 2024 | 2 | 2 | 1 | 2.00% ↑100% |
| 2022 | 1 | 2 | 0.5 | 1.00% ↓50% |
| 2021 | 1 | 1 | 1 | 2.00% ↓10% |
| 2020 | 1 | 1 | 1 | 2.22% ↓50% |
| 2019 | 2 | 1 | 2 | 4.44% ↑100% |
| 2018 | 1 | 1 | 1 | 2.22% ↓50% |
| 2017 | 2 | 1 | 2 | 4.44% ↓20% |
| 2016 | 5 | 2 | 2.5 | 5.56% ↑66.7% |
| 2015 | 3 | 2 | 1.5 | 3.33% ↓25% |
| 2014 | 2 | 1 | 2 | 4.44% ↑33.3% |
| 2013 | 3 | 2 | 1.5 | 3.33% ↓11.1% |
| 2012 | 3 | 2 | 1.5 | 3.75% ↑1.2% |
| 2010 | 3 | 2 | 1.5 | 3.70% ↓9.3% |
| 2009 | 2 | 1 | 2 | 4.08% ↑91.8% |
| 2008 | 1 | 1 | 1 | 2.13% ↓50% |
| 2007 | 2 | 1 | 2 | 4.26% ↑112.8% |
| 2006 | 1 | 1 | 1 | 2.00% ↓6% |
| 2005 | 1 | 1 | 1 | 2.13% ↓2.1% |
| 2004 | 1 | 1 | 1 | 2.17% ↑13% |
| 2003 | 1 | 1 | 1 | 1.92% ↓81.9% |
| 2002 | 5 | 1 | 5 | 10.64% ↑421.3% |
| 2001 | 1 | 1 | 1 | 2.04% ↓54.1% |
| 2000 | 2 | 1 | 2 | 4.44% |
Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t C, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where is the Stefan's constant.
A black body at 227 C radiates heat at the rate of 7 cal/cm2 s. At a temperature of 727 C, the rate of heat radiated in the same units will be
The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2 (T1 > T2). The rate of heat transfer, dQdt through the rod in a steady state is given by :
On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39 and 239 respectively. What will be the temperature on the new scale, corresponding to a temperature of 39 on the Celsius scale ?
Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t C, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where is the Stefan's constant.
A black body is at 727 . It emits energy at a rate which is proportional to
A black body at 1227 emits radiations with maximum intensity at a wavelength of 5000 A. If the temperature of the body is increased by 1000 , the maximum intensity will be observed at
Which of the following rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
If m denotes the wavelength at which the radiative emission from a black body at a temperature T K is maximum, then
Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is
Unit of Stefan's constant is
Consider two rods of same length and different specific heats (S1, S2), conductivities (K1, K2) and area of cross-sections (A1, A2) and both having temperatures T1 and T2 at their ends. If rate of loss of heat due to conduction is equal, then
For a black body at temperature 727 , its radiating power is 60 watt and temperature of surrounding is 227 . If temperature of black body is changed to 1227 then its radiating power will be
Which of the following is closest to an ideal black body?
The Wien's displacement law expresses relation between
A cylindrical rod has temperatures T1 and T2 at its ends. The rate of flow of heat is Q1 cal/s. If all the linear dimensions are doubled keeping the temperatures constant, then the rate of flow of heat Q2 will be
Gravitational force is required for
A black body emits maximum energy at wavelength m at 2000 K. Its corresponding wavelength at 3000 K will be