Physics question and answers for March 01, 2024
- Q Illustration 18 The opposite faces of a metal plate of 0 2 cm thickness are at a difference of temperature of 100 C and the area of the plate is...
- Q Three discs A B and C having radii 2 m 4 m and 6 m respectively are coated with carbon black on their outer surfaces The wavelengths corresponding to maximum...
- Q Two spheres of the same material have radii 1 m and 4 m temperatures 4000 K and 2000 K respectively Then the ratio of energy radiated per second by the...
- Q 1 Two spherical stars A and B emit blackbody radiation The radius of A is 400 times that of B and A emits 10 times the power emitted from B...
- Q rod AB of uniform cross section consists of 4 sections AC CD DE and EB of different metals with thermal conductivities K 0 8 K 1 2 K and 1...
- Q Pure water super cooled to 15 C is contained in a thermally insulated flask Small amount of ice is thrown into the flask The fraction of water frozen into ice...
- Q Four rods of identical cross sectional area and made from the same metal form the sides of square The temperature of two diagonally points are T and 2T respectively in...
- Q A cylindrical volume of cross section area A and length contains a uniform mixture of three gases H2 02 and CO2 If their ratio by volume be 1 1 3...
- Q 3 A black body is at a temperature of 2880 K The energy of radiation emitted by this object with wavelength between 250 nm to 255 nm is U between...
- Q Three rods of the same cross section and made of the same material form the sides of a triangle ABC as shown The points A and B are maintained at...
- Q A cylinder with adiabatic walls contains water The cylinder is closed on top with a metal cover with area A thickness b thermal conductivity K Heat capacity of water is...
- Q A black body has maximum wavelength Am at 2000 K Its corresponding wavelength at 3000 K will be A 2 2 C E 16 81 Nill m 4 Am 3...
- Q A metal ball of mass 0 1 kg is heated upto 500 C and dropped into a vessel of heat capacity 800 JK 1 and containing 0 5 kg water...
- Q You have two rods of the same length and diameter but they are formed for different materials The rods will be used to connect two regions of different temperature such...
- Q A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t The metallic rod is melted...
- Q 25 The two ends of a uniform lagged rod of thermal conductivity k are maintained at different but constant temperatures do The temperature gradient at any point on the rod...
- Q What is the temperature T at the interface if heat conductivity of first slab of length is K and is uniform every where but the conductivity of second slab of...
- Q 7 The temperature at the bottom of a pond of depth L is 4 C The temperature of the air just above the layer of ice frozen at the pond...
- Q der of radius R of thermal conductivity K is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of thermal conductivity K The two ends...
- Q A 100 watt electric heating element is placed in a pan containing one litre of water Although the heating element is on for a long time the water though close...
- Q 5 A vertical wooden cylinder AB of uniform cross section and closed at both ends and of length 1 10 m contains mercury occupying a column of length 10 cm...
- Q section are maintained at temperature T and T2 T T as shown in the figure 1 X T If I is heat current through the cross section of conductor at...
- Q cylinder of mass 0 5 kg is heated electrically by a 12 W heater in a room at 15 C Th cylinder temperature rises uniformly to 25 C in 5...
- Q Find the temperature of junction shown in figure for three rods identical in dimensions 80 C 2 K K 3 K 20 C
- Q A fan with copper winding in its motor consumes less power as compared to an otherwise similar fan having aluminium winding Explain 9 The thermal
- Q D Write True or False for the following 1 A clinical thermometer can be used to measure temperature of ice 2 A laboratory thermometer has a range from 10 to...
- Q 4 Four spheres A B C and D of different metals but of same radius are kept at same temperature The ratio of their densities is 2 3 5 1...
- Q D and E of 3 A composite block is made of slabs A B different thermal conductivities given in terms of a constant K and sizes given in terms of...
- Q is the eet sch of black body radiation a c Intensity b Intensity Wavelength d Wavelength atic representation of the graph T T T Wavelength T T Wavelength T T...
- Q 1 A steel ball of mass m 1 kg moving with velocity 50 m s collides with another ball of mass m2 200 gm lying on the ground During the...
- Q A planet having surface temperature T has solar constant S An angle 0 is subtended by the sun at planet then 1 ST2 3 S0 2 ST 1 S 0
- Q Two identical rods are connected in series a 100 joule heat is transferred in 10 seconds F the time taken to transfer same amount of hea the rods are connected...
- Q 21 Three identical thermal conductors are connected as shown in figure Consider no heat lost due to radiation the temperature of the junction is 1 60 C 3 50 C...
- Q 5 Standard free energies of formation in kJ mol at 298 K are 237 2 394 4 and 8 2 for H O 1 CO g and pentane g respectively...
- Q 100 g ice at 0 C is mixed with 10 g steam 100 C then mixture has 1 20 g ice and 90 g water 2 10 g ice and...
- Q The graph between radiation power from a linear antenna and square of length of antenna is given in the figure for two antenna A and B If all oth parameter...
- Q 1 4 cm 2 40 cm 3 44 cm 4 440 cm Rate of heat flow through two conducting rods of identical dimensions having thermal conductivities K and K are...
- Q loss if the number of grey bags sold is 5400 The temperature at 12 noon was 10 C above zero If it decreases at the rate of 2 C p...
- Q A sphere and cube of same material and same volume are heated upto the same temperature and allowed to cool in the same surrounding The ratio of the amount of...
- Q Aakash Rank Booster Test Series for Two ends of a uniform conductor of length are at temperature differences 100 C The temperature from one end is about 1 at point...
- Q The coefficient of emission for perfectly black body is azero binfinity efone dless than one
- Q of curved surface of rods is completely insulated the rate of heat flow through AB is H The rate of heat flow through BD is 100 C 0 C 2H...
- Q 1 HRT in 2 2 MRT In 2 nRT In 2 3 4 2nRT In 41 In a cold storage ice melts at the rate of 2 Kg h when...
- Q Four spheres A B C and D have their radii in arithmetic progression and the specific heat capacities of their substances are geometric progression If the ratios of heat capacities...
- Q 44 Instantaneous temperature difference between cooling body and the surroundings obeying Newton s law of cooling is 0 Which of the following represents the variation of In 0 with time...
- Q Four identical metal rods are connected as shown in figure Assume there is no heat loss through side walls of the rods and no radiation loss the junction temperature in...
- Q Find the rate of heat flow through a cross section of the rod shown in figure T T Thermal conductivity of he material of the rod is K Dir
- Q A body cool from 90 C to 70 C in 10 minutes if temperature of surrounding is 20 C find the time taken by body to cool from 60 C...
- Q 1 Three objects coloured black gray and white ca withstand hostile conditions upto 2800 C Thes objects are thrown into a furnace where each c them attains a temperature of...
- Q Two metal cubes with 3 cm edges of copper and aluminium are arranged as shown in figure Find Al Cu b 100 C 20 C D The total thermal current...
- Q 24 A perfectly black body radiates 25 joule sec at 600 K The temperature at which an ordinary body of same area and emissivity 0 0256 would have same rate...
- Q A solid sphere solid cylinder and circular disc o same material and mass are maintained at same temperature The body which is cooling at fastest rate is 1 Solid sphere...
- Q Heat is incident on a athermanous body having emissivity 0 8 at the rate of 10 watt The quantity of heat reflected by it in two minutes is c 480...
- Q Suppose you stand with one foot on ceramic flooring and one foot on a wool carpet making contact over an area of 75 0cm with each foot Both the ceramic...
- Q Your 21 C bedroom uses a spherical bulb operating at a temperature of 2093 C Assuming that the diameter of the bulb is 19 56 cm and its emissivity is...
- Q Question 4 10 Points Your 27 C bedroom uses a spherical bulb operating at a temperature of 2027 C Assuming that the diameter of the bulb is 18 39 cm...
- Q Question 5 10 Points A steel iron metal rod is joined end to end with a stainless steel rod It is known that the two metals have the same radius...
- Q A steel iron metal rod is joined end to end with a stainless steel rod It is known that the two metals have the same radius r 0 36 cm...
- Q A steel bar 12 cm long is welded end to end to a copper bar 21 cm long Both bars are insulated perfectly on their sides Each bar has a...
- Q At what net rate does heat radiate from a 273 m black roof on a night when the roof s temperature is 14 83 C and the surrounding temperature is...
- Q Energy transferred as heat always moves from an object at higher temperature to an object at lower temperature an object with higher mass to an object with lower mass an...
- Q A scientist is trying to determine the specific heat of 10 0 g of an unknown substance He heats up the substance to a temperature of 100 0 C and...
- Q How much heat is required to melt 5 5 kg of ice at 9 C
- Q 3 A chemist mixes 500 g of lead at 500 C with 1 200 g of water at 20 C She then mixes 500 g of copper at 500 C...
- Q How much heat is required to vaporize 5 7 kg of water at 100 C
- Q A steel bar 9 cm long is welded end to end to a copper bar 21 cm long Both bars are insulated perfectly on their sides Each bar has a...
- Q A rod 43 cm long is made of steel and has a cross sectional area of 2 21 cm The temperature at one end of the rod is 0 deg...
- Q One end of an insulated metal rod is maintained at 100 deg C and the other end is maintained at 0 deg C by an ice water mixture The rod...
- Q At what net rate does heat radiate from a 300 m black roof on a night when the roof s temperature is 13 35 C and the surrounding temperature is...
- Q Radiation makes it impossible to stand close to a hot lava flow Calculate the rate of heat transfer by radiation from 1 25 m of 1342 C fresh lava into...
- Q At what net rate does heat radiate from a 284 m black roof on a night when the roof s temperature is 15 8 C and the surrounding temperature is...
- Q Cherry red embers in a fireplace are at 960 C and have an exposed area of 0 39 m and emissivity of 0 895 The surrounding room has a temperature...
- Q MY NOTES ASK YO A sample of iron with a mass of 1 95 kg initially at a temperature of 150 0 C is in a well insulated container Water...
- Q Bob makes coffee for his boss Jill every morning Jill wants her coffee exactly 102 degrees The coffee coming out of the pot is 140 degrees and the office is...
- Q 28 A Use arrows to show the direction of heat transfer B Draw 2 arrows for fast heat transfer br C Which object has no internal energy 0 C conductor...
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