Physics question and answers for March 03, 2024
- Q 1 The outer faces of a rectangular slab made of equal thickness of iron and brass are maintained at 100 C and 0 C respectively The temperature at the interface...
- Q 24 Two circular discs A and B having same mass with equal radii and emissivities heated to same temperature and are cooled under indentical conditions The inference drawn from their...
- Q Two rods one semi circular and other straight of same material and of same cross sectional area are joined as shown in the figure The points A and B are...
- Q 15 Certain amount of an ideal gas are contained in a closed vessel The vessel is moving with a constant velocity v The molecular mass of gas is M The...
- Q 14 gm of nitrogen gas at constant pressure has temperature of 300 K How much heat energy would be required to change its temperature to 350 K at same pressure...
- Q energy take The refrigerator in a kitchen shown in Fig 7 7 receives electrical input power of 150 to drive the system and it rejects 400 W to the kitchen...
- Q A human body has a surface area of approximately 1m The normal body temperature is 10K above the surrounding room temperature To Take the room temperature to he To 300K...
- Q 8 A cube a cylinder of height equal to its diameter and a sphere all solid are made of a metal and are of identical mass If all the three...
- Q A star with surface temperature 20 000K emits energy at a rate of 2 74 10 W Calculate the peak intensity wavelength and radius of the star a 1 63...
- Q 3 Three rods lengths 21 1 1 made of the same material and having the same area of cross section are joined as shown in figure The end points A...
- Q de In Newton s law of cooling KAO the dt proportionality constant k is k and k for two substances A and B having mass m and m area A...
- Q Out of the metal balls of same diameter one is solid and other is hollow Both are heated to the same temperature at 300 C and then allowed to cool...
- Q A black metal foil is warmed by radiation from a small sphere at temperature T and at a distance d It is found that the power received by the foil...
- Q I have asked this question previously However no satisfac tory response was provided My straightforward question is that why in question no 29 we are using dT dt 1 R...
- Q An ice box is built of wood 1 75 cm and fiber of 2 cm thickness as shown If the temperature of inner surface of fiber is 0 C and...
- Q 2 23 A block of metal is heated directly by dissipating power in the internal resistance of block Because of temperature rise the with resistance increases exponentially time and is...
- Q 3 5 kg lead ball is dropped into a 2 6 L insulated il of water initially at 20 0 C Part A If the final temperature of the water...
- Q The temperature T versus time t graphs of two bodies X and Y with equal surface areas are shown in the figure If the emissivity and the absorptivity of X...
- Q A If 20 grams of water at 20 C is supplie 20 Cal of heat energy then temperature of water is ie A 20 C B 21 C C 40...
- Q Dear sir mam I have a doubt in physics Sir mam my doubt is a vessel contains 100 gram water at 10 degree Celsius at 42 ohms resistance wire is...
- Q 3 1 4 12 80 gm of water at 30 C is poured on a large block of ice at 0 C The mass of ice that melts is 1...
- Q 3 1 16 C 3 Latent heat of ice is 80 cal gm A man melts 60 gm of ice by chewing in 1 minute His power 1 4800 W...
- Q A jug of buttermilk is set to cool on a front porch where the temperature is 0 C The jug was originally at 90 C If the buttermilk has cooled...
- Q Gasoline has an enthalpy of combustion 24000 kJ gallon When gasoline burns in an automobile engine approximately 30 of the energy released is used to produce mechanical work The remainder...
- Q A uniform rod of cross sectional area A 0 2 cm is bent to form a squar of side 1 10 cm The ends A B and C of the...
- Q 4 Six identical conducting rods are joined as shown in figure A 200 C B 1 120 C 3 140 C C Points A and Dare maintained at temperatures 200...
- Q A highly thin conducting spherical shell of radius R is completely filled with water at 0 C Outside surrounding temperature is T C Latent heat of fusion of water is...
- Q Power radiated by a perfectly black body is Po and wavelength corresponding to maximum energy is o On changing temperature the wavelength corresponding to maximum energy is increased by Now...
- Q The temperature of a metal ingot is 60 C above room temperature right now Twenty minutes ago it was 75 C above room temperature a How far above room temperature...
- Q The graph shown in the figure represent change i he temperature of 5 kg of a substance as it abosrb eat at a constant rate of 42 kJ min The...
- Q Three discs A B and C having radii 2m 4m and 6m respectively are coated with carbon black on their outer surfaces The wavelengths corresponding to maximum intensity are 300...
- Q A point source of power P is placed on the axis of a thin hemispherical shell as shown The shell has a radius of 3m and behaves like a perfect...
- Q QA metal bar of length I is well lagged with some non conducting material to prevent losses of heat from its surface and the two ends are maintained at steady...
- Q The ends of a long bar are maintained at different temperatures and there is no loss of heat from the sides of the bar due to conduction or radiation The...
- Q 6 Three conducting rods of same material and cross section are shown in figure Temperatures of A D and C are maintained at 20 C 90 C and 0 C...
- Q 13 A copper rod and a steel rod of equal cross sections and lengths L are joined side by side and connected between two heat baths as shown in the...
- Q The given indi diagram shows variation of pressure with volume when a thermodynamical system is taken from state A to state B During the process P A 0 0 B...
- Q The specific heat of a substance varia temperature is s 0 2 0 14 0 0 cal g C The heat required to rai temperature of 2g of substance from...
- Q 14 A sphere and cube made of same material and having same surface area are heated to the same temperature and kept in the same surrounding The ratio of their...
- Q The ends of a long bar are maintain different temperatures and there is no loss of heat from the sides of the bar due to conduction or radiation The graph...
- Q The graph between two temperature scales A B is shown between upper fixed point and lower fixed point There are 150 divisions on scale A and 100 divisions on scale...
- Q The temperature of the two outer surfaces of a composite slab consisting of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x respectively are...
- Q hreerods of destiest ares of cross section and made from the same metal form the sides of an isoscelas ang ABC gargle st B The poets And Bac maintained at...
- Q A highly thin conducting spherical shell of radius Ro is completely filled with water at 0 C Outside surrounding temperature is To C Latent heat of fusion of water is...
- Q A hemispherical bowl of radius R is filled with water and is cooling due to convection in atmosphere If its initial rate of cooling is de find the rate of...
- Q cal pipe of length 10 cm has inner radius 3 cm and outer radius r2 12 cm The temperature T1 difference between the inner and outer layer of cylindrical pipe...
- Q Figure shows two reservoirs containing two liquids of masses 4 m and 2 m and their specific heat capacities are s and 2s respectively Their initial temperatures are 47 and...
- Q Consider a sphere of radius R with power source inside it The power of source is P In steady state temperature of surface of the sphere is To The sphere...
- Q The power radiated by a black body is P and it radiates maximum energy around the wavelength Ao If the temperature of the black body is now changed so that...
- Q A vessel is divided into two parts A and B by a fixed partition The walls of the vessel and the partition are made of a perfect heat insulating material...
- Q A black body calorimeter filled with hot water cools from 60 C to 50 C in 4 minutes and 40 C to 30 C in 8 minutes The approximate temperature...
- Q Questions 28 and 29 are based on the following physical situation A hollow cylinder made of a thermally insulating material is equipped with a horizontal piston P of mass m...
- Q Heat is conducted across a composite block of two slabs of thickness dand 2d Their thermal conductivities are 2k and k respectively All the heat entering the face AB leaves...
- Q The total power emitted by a spherical blackbody of radius R at a temperature T is P Let P be the total power emitted by another spherical blackbody of radius...
- Q Two vessels having equal volume contains molecular hydrogen at one atmosphere and helium at two atmospher s respectively If both samples are at the same temperature the mean velocity of...
- Q A particle is in a cubic box with infinitely hard walls whose edges are L long Fig 5 18 The wave functions of the particle are given by Asin n...
- Q When a body is placed in surroundings at a constant temperature of 20 C and heated by a 10 W heater its temperature remains constant at 40 C If the...
- Q temperature An object kept in a large room having air of 25 C takes 12 minutes to cool from 80 to 70 C The time taken to cool for the...
- Q pond of surface area A containing water density p specific heat capacity s is located in a region where the outside air temperature is at a steady value of 26...
- Q SZ 180 250 cal Heat required to convert 10 g of ice at 10 C to water at 20 C is 2916 cal 850 cal Mark for Review 1050 cal...
- Q Three identical rods are joined together as shown in the figure Temperatures are indicated The temperature at the junction is 10 C 21 C 70 3 C 30 C 11...
- Q 4 A glass tube sealed at top end is inverted in mercury reservoir such that top end is at 76cm from free surface of mercury in reservoir Amount of monoatomic...
- Q them The temperature difference between a body and surrounding changes from 20 C to 10 C in 5 minute How long will it take to change the difference from 10...
- Q In thermal radiation of two black bodies the wavelengths corresponding to maximum emittance are in 2 3 proportion The ratio of areas of curves of spectral emissive power of bodies...
- Q A rigid insulated box is divided into two parts with a partition One part is occupied by 1 gm mole of ideal gas at temperature T and the other by...
- Q 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 following...
- Q perat equall cold or hot The temperatures of block of wood and block of metal are Equal to temperature of the body Less than the temperature of the body Greater...
- Q A piece of charcoal and a piece of shining steel of the same area are kept for a lon time in an open lawn in bright sun A the steel...
- Q A spherical black body with radius of 10 cm radiates 500 W power at 400 K If temperature is doubled and radius is halved then power radiated in watt will...
- Q the layer A is a 50K b 12 5K c 25 K d 60 K 24 Which of the following statements is are false about mode of heat transfer a...
- Q Boiling 3 A sphere made of aluminium alloy 2024 with a diameter of 20 mm and a uniform temperature of 500 C is suddenly immersed in a saturated water bath...
- Q Heat is removed from a molten metal of mass 2 kg at a constant rate of 10 kW till it is completely solidified The cooling curve is shown in the...
- Q Four rods of same material with different radii r and length 1 are used to connect two heat reservoirs at different temperatures In which of following case heat conduction is...
- Q onsider a compound slab consisting of two different material having ual thickness and thermal conductivities k and 3k respectively as own in figure The equivalent thermal conductivity of the slab...
- Q A refrigerator converts 100 g of water at 25 C into ice at 10 C in one hour and 50 minutes The quantity of heat removed per minute is specific...
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