Physics question and answers for March 02, 2024
- Q 19 Two rods of same material have same length and area The heat AQ flows through them for 12 minutes when they are joint side by side If now both...
- Q What is the coefficient of performance of an ideal heat pump that extracts heat from 7 0 C air outside and deposits heat inside a house at 22 C Express...
- Q A metal plate 4 mm thick has a temperature difference of 32 C between its faces It transmits 200 kcal h through ar area of 5 cm Thermal conductivity of...
- Q 49 A liquid initially at 70 C cools to 55 C in 5 min and 45 C in 10 min What is the temperature of the surroundings a 22 C...
- Q at te of 9 17 14 17 cm d 3 17 5 17 cm c 9 17 18 17 cm 20 A copper rod 2 m long has a circular...
- Q 7 A 42 kg block of ice moving on rough horizontal surface stops due to friction after sometime If the initial velocity of the decelerating block is 4 ms the...
- Q a C spectra of a black body at temperatures 273 C and 546 C are shown in the figure If A and A be the areas A2 is under the...
- Q a 1 b 1 2 c 2 3 1923 d 1 3 7 Two holes of unequal diameters d and d d d are cut in a metal sheet If...
- Q Three identical bodies are at temperature T T and T having e e and e as their respective emissivities The thermal spectrum obtained for them is as shown in the...
- Q a P b E 2 c 4P d 2P 14 How much heat energy in joules must be supplied to 14g of N at room temperature to raise its temperature...
- Q d Heating air around a furnace 2 Three discs A B and C having radii 2 m 4 m and 6 m respectively are coated with carbon black on their...
- Q A spherical object which behaves as a black body is raised to the temperature T and placed in an environment initially at o c While the object cools from T...
- Q are 13 Two identical conducting rods first connected independently to two vessels one containing water at 100 C and the other containing ice at 0 C In the second case...
- Q Problem 1 50 points You are ready to boil pasta for dinner so you fill a 2 lb aluminum pot with roughly 1 2 L of water initially at 15...
- Q 22 The variation of temperature of a material as heat is given to it at a constant rate as shown in the figure The material is in solid state at...
- Q Two rods of equal length and area of cross section are kept parallel and lagged between temperature 20 C and 80 C The ratio of the effective thermal conductivity to...
- Q Consider a compound slab consisting of two different material having equal thickness and thermal conductivities k and 3k respectively as shown in figure The equivalent thermal conductivity of the slab...
- Q 48 The inside and outside temperature of a refrigerator are 273K and 303 K respectively Assuming that refrigerator cycle is reversible for every joule of work done the heat delivered...
- Q The thickness of ice on surface of a lake becomes x cm and y cm starting from zero thickness in time t and to respectively If to 1 3 t...
- Q Two thin concentric shells made of copper with radius r and r r r have a material of thermal conductiv K filled between them The inner and outer spheres are...
- Q Consider two insulating sheets with thermal resistances R R and R as shown The temperature 0 is 1 2 3 0 4 2 Question Type Single Correct Type R 0...
- Q The two opposite faces of a cubical piece of iron Thermal conductivity 0 2 SI units are at 100 C in steam and 0 C in ice If the area...
- Q A black body is at a temperature of 2880 K The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is u between 999...
- Q Calculate the rate of loss of heat through a glass window of area 1000 cm and thickness 0 4 c when temperature inside is 37 C and outside is 5...
- Q 59 A system has non degenerate energy levels with energy E n 1 w where hw 8 625 10 5 eV and n 0 1 2 3 Calculate the probability...
- Q 56 From observations on the intensities of lines in the optical spectrum of nitro gen in a flame the population of various vibrationally excited molecules rela tive to the ground...
- Q 61 A wire of length 1 m and radius 1 mm is heated via an electric current to pro duce 1 kW of radiant power Treating the wire as a...
- Q 5 Assume the sun to be a black body at temperature 5800K The total ra diant energy emitted by the Sun per second and the solar energy reach ing Earth...
- Q A horizontal pipe 6 m long and 12 5 cm in diameter is maintained at a temperature of 150 C in a large room where the air is 20 C...
- Q A closed cubical box made of perfectly insulating material has walls of thickness 8 cm and the only way for heat to enter or leave the box is through two...
- Q A cooling curve is plotted between the temperature of a hot body and time Which of the following is not true for the cooling curve 1 Cooling is faster from...
- Q B The time taken by ice on the surface of a pond grow from zero initial thickness to a thickness 2 5 cm is 25 hrs Find the time taken...
- Q A chunk of metal with a mass of 0 800 kg and 1 500 kg of water are separated from each other and are at different temperatures The metal is...
- Q objects are placed in a room with perfectly absorbing walls maintained at a temperature T TA T TB The objects A and B attain the temperature T eventually Select the...
- Q A steel ball of mass m 1 kg 1 moving with velocity 50 m s collides S with another ball of mass m 200 g m2 lying on the ground...
- Q area A rod of length 5 m is prevented thermal expansion by fixing its ends rigidly is 40 cm Its cross sectional Calculate thermal stress developed on a temperature rise...
- Q 4 A room at 20 C is heated by a heater of power 2 kW The temperature is uniform throughout the room and the heat is transmitted thrugh a glass...
- Q Q 45 A cylindrical rod of length 1 thermal conductivity k and area of cross section A has one end in a furnace maintained at constant temperature The other end...
- Q A hollow cylinder made of thermally insulating material is equipped with a horizontal piston P of mass m and area A The piston is also made by thermally insulating material...
- Q SolveLancer Test The appearance of colour of hot objects is as per Kirchhoff s law of radiation It means a hot object will emit only that colour which it absorbed...
- Q A refrigerator has to transfer an average of 26 J of heat per second from temperature 10 C 27 C Assuming no other power losses th average power consumed by...
- Q Two rods of copper and brass having the same length and cross section are joined end to end The free end of the copper rod is at 0 C and...
- Q 57 The ends of a copper rod of length 1m and area of cross section 1 cm are maintained at 0 C and 100 C At the centre power is...
- Q Two similar rods but of different materials are joined together end to end The ratio of their thermal conductivities is 2 3 The composite rod is lagged between meting ice...
- Q on 14 A sphere of radius R is at an absolute temperature T The missivity of the surface depends on the angles e measured from a reference e sin 0...
- Q Question 12 A system of rods is assembled such that each rod has a length f and cross sectional area S The mode of heat transfer is conduction and the...
- Q dry air was bubbled through a bulb containing 26 66 g of an organic compound in 200 g of water then through a bulb at the same temperature containing water...
- Q During a dry period in Earth s history riverine fluxes to the oceans were only 5 x 10 km yr What was the residence of water in the oceans during...
- Q Three rods made of same material having the same cross section have been joined as shown in the figure Each rod is of the same length The left and right...
- Q at 35 One end of a conducting rod is maintained temperature 50 Cand at the other end ice is melting at 0 C The rate of melting of ice is...
- Q 5 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...
- Q Three rods of equal length area of cross section and thermal conductivity are connected as shown in the figure There is no heat loss through lateral surface of the rods...
- Q ion Three rods of material x and three of material y are connected as shown in figure All the rods an dentical in length and cross sectional area If the...
- Q Consider two hot bodies B and B2 which have temperatures 100 C and 80 C respectively at t 0 The temperature of the surroundings is 40 C The ratio of...
- Q A metal ball of surface area 200 cm and temperature 527 C is surrounded by a vessel at 27 C If the emissivity of the metal is 0 4 then...
- Q A layer of ice 0 C of the thickness x is floating on a pond of water L p and k respectively are the latent heat of fusion of water...
- Q Thermal Properties of Matter Heat and Temperature 24 A copper block of mass 2 5 kg is heated in a furnace to a temperature of 500 C and then placed...
- Q The temperature of an air stream flowing with a velocity of 3 m s is measured by a copper constantan thermocouple which may be approximated as sphere of 3 mm...
- Q Suppose that in winter the daytime temperature in a certain office building is maintained at 70 F The heating is shut off at 10 P M and turned on again...
- Q Tor Two identical bodies are made of a material which the heat capacity increases with temperature One of these is at 100 C while the other one is at 0...
- Q 15 A block of ice at 10 C is slowly heated and converted to steam at 100 C Which of the following curves represents the phenomena qualitatively 2000 2M a...
- Q A gas turbine blade made of stainless steel k 32 W m deg is 70 mm long 500 mm cross sectional area and 120 mm perimeter The temperature of the...
- Q 3 A thermal conductor of uniform cross sectional area A has its thermal conductivity decreasing from end A towards end B with end A maintained at higher temperature T A...
- Q Four identical rods which have thermal insulated lateral surfaces are joined at point O Points A B C and D are connected to furnaces maintained constant temperatures If the heat...
- Q A stationary object at 4 C and weighing 3 5 kg falls from a height of 2000m on a snow mountain 0 C If the temperature of the object just...
- Q 1 To the Window An ice factory as expected is quite chilly and must maintain an inside temperature of 25 Degrees F On a day like today the average temperature...
- Q The rods of identical cross section and lengths are made of three different materials of thermal conductivity K K and K3 respectively They are joined together at their ends to...
- Q Two metallic spheres S and S are made of the same material and have got the identical surface finish The mass of S is thrice that of S Both the...
- Q Problem 1 Radiation sensor Hot part 0 5 m x 2 m 4 m Problem 1 The top surface of a 5mm thick nodized aluminum plate is suddenly irradiated with...
- Q A concerned mother is dressing her child for play in the snow The child s skin temperature is 34 degrees Celsius and the outside air temperature is 1 5 degrees...
- Q 4 A black body at 327 C suspended in a black enclosure at 27 C cools at certain rate If temperature of black body is lowered to t C so...
- Q 4 A parallel plate capacitor is filled by a dielectric whose permittivity varies with the applied voltage according to the laws at where a IV The same but containing no...
- Q Two cylinders of same diameter one of silver and other of aluminium are placed in contact as shown in the figure If the thermal conductivity of silver is K and...
- Q 3 SA SB 6 Assume that Solar constant is 1 4 kW m radius of sun is 7 x 105 km and the distance of earth from centre of sun...
- Q Three identical conducting rods are joined as shown in the figure Points A and B are maintained at temperatures 300 C and 60 C respectively The temperature of the junction...
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