Physics question and answers for March 04, 2024
- Q A cylindrical rod having temperature T and T2 at its ends The rate of flow of heat is Q cal s If all the linear dimensions are doubled keeping temperature...
- Q Two identical square rods of metal are welded end to end as shown in Fig i 20 calories of heat flows through it in 4 min If the rods are...
- Q CPMT 1978 a Increases with time b Decreases with time c Does not change with time and is same at all the points of the body Does not change with...
- Q The two ends of a rod of length x and a uniform cross sectional area A are kept at two temperatures 8 and 0 0 02 The rate of dQ...
- Q A metal rod of length 2m has areas 2A and 100 C cross sectional A as shown in figure The ends are maintained at temperatures 100 C and 70 C...
- Q Temperature gradient on a 0 75 m long rod is 80 C m If the temperature of the hot end of the rod is 80 C then the temperature of...
- Q 7 hours Ice starts forming in a lake with water at 0 C when atmospheric temperature is 10 C If time taken for 1 cm of ice layer to be...
- Q The air flow to a four cylinder four stroke engine is 2 15 m min During a test on the engine the following data were recorded Bore 10 5cm stroke...
- Q 46 Figure shows a composite rod containing two p The thermal conductivities and the geome dimensions are marked If the ends are maintaine at temperature T and T2 respectively temperature...
- Q Two spheres of same material but radii in ratio 2 1 are heated to same temperature and left in same surrounding The rate of the cooling will be in the...
- Q Two spheres of same radius R have their densities in the ratio 1 8 and the ratio of their specific heats are 4 1 and ratio of their emisivity are...
- Q An ideal string is wrapped several times on a solid cylinder of mass 4 kg and radius 1 m The pulleys are 10x N m ideal and the surface between...
- Q 14 Which of the following is incorrect NCERT Pg 305 1 If two systems A and B are in thermal equilibrium with system C separately then A and B will...
- Q The temperature of furnace is 200 C in its spectrum the maximum intensity is obtained at about 400 If the maximum intensity is at 200 Calculate the temperature of the...
- Q The viscosity of a gas a decreases b c d with increase in 9 temperature increases temperature is independent of temperature is independent of pressure for very high pressure intensities...
- Q A body is cooling under Newton s law of cooling Temperature difference between body and surrounding falls from 80 C to 40 C in 20 minute Approximate time in which...
- Q Two conductors A and B each of cross section area 5 cm are connected in series Variation of temperature in C along the length in cm is as shown in...
- Q 5 A solid conducting sphere of radius R is rotat with constant angular velocity o about diameter If charge Q is uniformly distributed its surface then its magnetic dipole moment...
- Q The surface temp of a small planet having a circular orbit round the sun with time period assuming sun and the planet to be black bodies Take radius of sun...
- Q 3 A rigid container with thermally insulated walls contains a coil of resistance 100 2 carrying current 1 A Change in internal energy after 5 minute will be a 0...
- Q Two spheres S and S have radij R and 3R temperature I K and 7 3 K respectively if they are coated with a material of same emissivity rate radiation...
- Q Two spheres S and S have radii R and 3R temperature T K and K respectively I 3 they are coated with a material of same emissivity rate of radiation...
- Q Ice starts forming in a lake with water at 0 C when atmospheric temperature is 10 C If time taken for 1 cm of ice layer to be formed is...
- Q 3 Radiation Judo 4 26 The temperature gradient in a rod of 0 5 m long is 80 C m If the temperature of hotter end of the rod is...
- Q 38 A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents Which of the...
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