Question Answers
Sahay Sir > Question Answers
Two metallic spheres S1, and S2 are made of the same material and have got identical surface finish. The mass of S1 is thrice that of S2. Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of S1 to that of S2 is
10
Sep
Two metallic spheres S1, and S2 are made of the same material and have got identical surface finish. The mass of S1 is thrice that of S2. Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio [...]
A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature 120 C, then
10
Sep
A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature 120 C, then A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature 120 C then September 10, 2021 Category: Cengage NEET by [...]
The temperature of an isolated black body falls from T1 to T2 in time t . Let c be constant.
10
Sep
The temperature of an isolated black body falls from T1 to T2 in time t . Let c be constant. The temperature of an isolated black body falls from T1 to T2 in time t . Let c be constant. September 10, 2021 Category: Cengage NEET by C.P Singh , Chapter 22 - Heat Transfer [...]
A spherical black body of radius r radiates power P , and its rate of cooling is R .
10
Sep
A spherical black body of radius r radiates power P , and its rate of cooling is R . A spherical black body of radius r radiates power P and its rate of cooling is R . September 10, 2021 Category: Cengage NEET by C.P Singh , Chapter 22 - Heat Transfer , Part 1 [...]
Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. The temperature of the middle (i.e., second) plate under steady state condition is :
10
Sep
Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. The temperature of the middle (i.e., second) plate under steady state condition is : [...]
A system S receives heat continuously from an electrical heater of power 10 W. The temperature of S becomes constant at 50 C when the surrounding temperature is 20 C. After the heater is switched off, S cools from 35.1 C to 34.9 C in 1 minute. The heat capacity of S is :
10
Sep
A system S receives heat continuously from an electrical heater of power 10 W. The temperature of S becomes constant at 50 C when the surrounding temperature is 20 C. After the heater is switched off, S cools from 35.1 C to 34.9 C in 1 minute. The heat capacity of S is : A [...]
Two spheres of radii in the ratio 1 : 2 and densities in the ratio 2 : 1 and of same specific heat, are heated to same temperature and left in the same surrounding. There rate of cooling will be in the ratio
10
Sep
Two spheres of radii in the ratio 1 : 2 and densities in the ratio 2 : 1 and of same specific heat, are heated to same temperature and left in the same surrounding. There rate of cooling will be in the ratio are heated to same temperature and left in the same surrounding. There [...]
Two bodies A and B having equal surface areas are maintained at temperatures 10 C and 20 C. The thermal radiation emitted in a given time by A and B are in the ratio
10
Sep
Two bodies A and B having equal surface areas are maintained at temperatures 10 C and 20 C. The thermal radiation emitted in a given time by A and B are in the ratio Two bodies A and B having equal surface areas are maintained at temperatures 10 C and 20 C. The thermal radiation [...]
Two spherical black bodies of radii r1 and r2 are with surface temperatures T1 and T2 respectively radiate the same power. r1 /r2 must be equal to
10
Sep
Two spherical black bodies of radii r1 and r2 are with surface temperatures T1 and T2 respectively radiate the same power. r1 /r2 must be equal to Two spherical black bodies of radii r1 and r2 are with surface temperatures T1 and T2 respectively radiate the same power. r1 /r2 must [...]
A spherical black body with a radius of 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled, the power radiated in watts would be :
10
Sep
A spherical black body with a radius of 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled, the power radiated in watts would be : A spherical black body with a radius of 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled the [...]