Thermal Properties of Matter questions
823 published questions with worked solutions.
- A black body radiates 20 W at temperature 227℃. If temperature of the black body is changed to 727℃, then its radiating power...
- A black body at a temperature of 227℃ radiates heat energy at the rate of 5 cal/cm²-second. At a temperature of 727℃, the rate of...
- A black body at 227℃ radiates heat at the rate of 7 cal/cm² s. At a temperature of 727℃, the rate of heat radiated in the same...
- A metal ball of surface area 200 cm² and temperature 527℃ is surrounded by a vessel at 27℃. If the emissivity of the metal is...
- Emissive power of a black body at a temperature 300 K is 81 J ,m^ -2 ,s^ -1 . Another one is an ordinary body having emissivity...
- Two spheres P and Q of same colour having radii 8 cm and 2 cm kept at temperature 127℃ and 527℃ respectively. The ratio of the...
- A body radiates heat at the rate of 5 cal ,m^ -2 ,s^ -1 when its temperature is 227℃. The heat radiated by the same body when its...
- Two spherical black bodies of radii r_1 and r_2 and with surface temperature T_1 and T_2 respectively radiate the same power....
- Rate of loss of heat of two spheres at same temperature having radii in ratio 1 : 2 is
- Parallel rays of light of intensity I = 912 W ,m^ -2 are incident on a spherical black body kept in surroundings of temperature...
- A body radiate energy 5 W at a temperature of 127℃. If the temperature is increased to 927℃, then it radiates energy at the rate...
- Certain quantity of water cools from 70℃ to 60℃ in the first 5 minutes and to 54℃ in the next 5 minutes. The temperature of the...
- Rate of cooling of body is 0.5℃/min, when the system is 50℃ above the surroundings. When a system is 30℃ above the surroundings,...
- According to Newton's law of cooling, the rate of cooling of a body is proportional to ( )^n, where is the difference of the...
- Two metallic spheres S_1 and S_2 are made of the same material and have identical surface finish. The mass of S_1 is three times...
- A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature 120℃, then [MP PET...
- A bucket full of hot water cools from 75 ℃ to 70 ℃ in time T_1, from 70 ℃ to 65 ℃ in time T_2 and from 65 ℃ to 60 ℃ in time T_3,...
- A liquid cools from 70 ℃ to 60 ℃ in 5 minutes. If the temperature of the surrounding is constant at 30℃, then the time taken by...
- A body cools from 100℃ to 70℃ in 8 minutes. If temperature of surrounding is 15℃, then time required for body cools from 70℃ to...
- An object of cooled from 75 ℃ to 65 ℃ in 2 minutes in a room at 30 ℃. The time taken to cool another object from 55℃ to 45℃ in...
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