Physics question and answers for March 05, 2024
- Q For a given plate the coefficient of absorption is 0 60 and coefficient of transmission is 0 1 When calories of heat is incident on the plate the quantity of...
- Q Ice starts forming in a lake where the water is at 0 C and the ambient temperature is 10 C If the time taken for 1 cm of ice to...
- Q An electric water heater has a resistance of 12 ohms and is operated from 220 volt power line If no heat escapes from it how much time is required to...
- Q An engine operates between 2100 K and 700 K Its actual efficiency is 40 What percentage of its maximum possible efficiency is this Question Type Single Correct Type 1 2...
- Q A black body radiates maximum energy at wavelength 2 and its emissive power is E Now due to change in temperature of that body it radiates maximum energy at wavelength...
- Q Please explain 15 A long metallic bar is carrying heat from one of its ends to the other end under steady state The variation of temperature 0 along the length...
- Q A ring consisting of two parts ADB and ACB of same conductivity k carries an amount of heat H The ADB part is now replaced with another metal keeping the...
- Q Find the change in the entropy in the following process 100 gm of ice at 0 C melts when dropped in a bucket of water at 50 C Assume temperature...
- Q A window has dimensions of 1 05 m by 2 4 m and is made of glass 7 75 mm thick On a winter day the outside temperature is 25...
- Q B A heat pump can use a maximum of 2 5 kW power for maintaining a house at 20 C during winter The rate of heat transfer from the roof...
- Q An automobile vehicle of 1500 kg mass is running at a speed of 60 km hr The brakes are applied and the vehicle is brought to rest Calculate the rise...
- Q hree superconducting thin plates are given where temperature of plates at steady state are T T T3 espectively as shown in figure If each side of plate can absorb only...
- Q Three rods A B and C of thermal conductivities K 2K and 4K and equal cross sectional areas and lengths 21 t and t respectively are connected as shown in...
- Q Steam at 100 C is passed into 1 1 kg of water contained in calorimeter of water equivalent 0 02 kg at 15 C till the temperature of the calorimeter...
- Q Full Marks Zero Marks 0 In all other cases Two conducting rods are joined at P and end A and end B are kept at fixed temperature Temperature variation from...
- Q Apendulum clock keeps correct time at 0 C The thermal coefficient of linear expansion of the material of the pendulum is a If the temperature rises to t C then...
- Q In a composite rod when two rods of different lengths and 2 and of the same cross sectional area are joined from end to end then if K is the...
- Q Three rods of same dimensions are arranged as shown in the figure They have thermal conductivities K K and K3 The points P and Q are maintained at different temperature...
- Q A 120 g aluminum cylinder is removed from a liquid nitrogen bath where it has been cooled to 196 C The cylinder is immediately placed in an insulated cup containing...
- Q A wall has two layers A and B made of different materials The thickness of both the layers is the same The thermal conductivity of A and B are KA...
- Q For cooking the food which of the following type of utensil is most suitable SCRA 1998 MP PMT PET 1998 2000 RPET 2001 High specific heat and low conductivity High...
- Q A slab consists of two parallel layers of copper and brass of the same thickness and having thermal conductivities in the ratio 1 4 If the free face of brass...
- Q The two ends of a rod of length L and a uniform cross sectional area A are kept at two temperature T and T T T The rate of heat...
- Q ater in a lake starts freezing at t 0 when the outside temperature is 0 C The time intervals in which thickness changes from 0 to y from to 2y...
- Q A black body emits maximum radiation near a wavelength Am The emissivity of the material is 0 7 If the absolute temperature of the black body is doubled then A...
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