P-T graph of water The above graph represents the pressure temperature behavior of water called phase diagram and the intersection is called triple point. If temperature is decreased at triple point it will go in the
One kg ice at 0°C is mixed with 1kg of water at 10°C. The resulting temperature will be:
When vapour condenses into liquid:
5 g of ice at 0°C is mixed with 5 g of steam at 100°C. What is the final temperature of the mixture?
Steam at 100 0 C is passed into 20 g of water at 10 0 C. When water acquires a temperature of 80 0 C, the mass of water present will be (Take, specific heat of water = 1 calg -1 0 C -1 and latent heat of steam = 540 cal g -1 )
Four moles of hydrogen, 2 moles of helium and 1 mole of water vapour form an ideal gas mixture. What is the molar specific heat at constant pressure of mixture?
A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is [Latent heat of ice is 3 . 4 × 10 5 J / k g a n d g = 10 N / k g ]
A substance of mass m requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance?
Liquids A and Bare at 30°C and 20°C. When mixed in equal masses, the temperature of the mixture is found to be 26°C.Their specific heats are in the ratio of:
10 g of ice at -20°C is dropped into a calorimeter containing 10 g of water at l 0°C; the specific heat of water is twice that of ice . When equilibrium is reached,· the calorimeter will contain:
0.1 m 3 of water at 80°C is mixed with 0.3 m 3 of water at 60°C. The final temperature of the mixture is:
Equal masses of three liquids A, Band C have temperatures 10°C, 25°C and 40°C respectively.. If A and B are mixed, the mixture has a temperature of 15°C. If B and C are mixed, the mixture has a temperature of 30°C. If A and Care mixed, the mixture will have a temperature of:
An ideal gas has molar specific heat 5R/2 at constant pressure. If 300 J of heat is given to two moles of gas at constant pressure, the change in temperature is:
The diagram given below shows phase changes for a substance based on experimental observations. Select the correct statement.
Find the wrong statement among the following
2 kg of ice at – 20 0 C is mixed with 5 kg of water at 20 0 C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal kg -1 0 C -1 and 0.5 kcal kg -1 0 C -1 while the latent heat of fusion of ice is 80 kcal kg -1 .
1 gm of steam at 100 0 C is mixed with 4 gm of ice at 0 0 C. Then final temperature of the mixture is …… Latent heat of fusion = 80 cal/gm Latent heat of evaporation = 540 cal/gm
A block of ice of mass 50 kg is sliding on a horizontal plane. It starts with speed 5 ms -1 and stops after moving through some distance. The mass of ice that has melted due to friction between the block and the surface is (Assuming that no energy is lost and latent heat of fusion of ice is 80 cal g -1 , J = 4.2 J cal -1 )
What will be the final temperature of the mixture when 20 gm of water at 30 o C is mixed with 4 gm of water at 80 o C
Some steam at 100 o C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15 o C so that the temperature of the calorimeter and its contents rises to 80 o C . Then the mass of steam condensed (in kg) is
The unit of specific heat is:
The temperature of equal masses of three different liquids A,B and C are12°C, 19°C and 28° C respectively. The temperature when A and B are mixed is 16°C and when B and C are mixed is 23°C. The temperature when A and C are mixed is:
A substance of mass m kg requires a power input of P watt to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. The latent heat of fusion of the substance is:
In the definition of calorie, one calorie is the heat required to raise the Temperature of 1 gram of water through 1 °C in a certain interval of temperature and at certain pressure. The temperature interval and the pressure are:
Consider the following statements. (A) In pressure-temperature phase diagram of water,the slope of the melting curve is found to be negative. (B) Ice contracts on melting of water. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Steam is passed into 54 g of water at 30°C till the temperature of the mixture becomes 90°C. If the latent heat of steam is 536 cal/g, the mass of the mixture will be:
Liquid oxygen at 50 K is heated to 300 K at constant pressure of I atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?
Heat is supplied to a monoatomic ideal gas which expands at constant pressure. Fraction of heat that goes into work done by the gas is:
Two blocks of ice join together where passed. Which one of the following will appropriately account for this?
Two spheres of radii in the two ratios 2 : 3 have specific heat in the ratio 3 : 2. What is the ratio of their thermal capacities?
Pure water cooled to – 15°C is contained in a thermally insulated flask. Some ice is added into the flask. The fraction of water frozen into ice is :
Four students found set of C p and C v (in cal/deg mole) as given below. Which of the following set is correct
The ratio (C P / C V ) of the specific heats at a constant pressure and constant volume of any perfect gas
When an ideal diatomic gas is heated at constant pressure, the fraction of heat energy supplied which increases the internal energy of the gas is
In a pressure cooker, the cooking is fast, because
The sprinkling of water reduces the temperature of a closed room because
Two tanks A and B contain water at 30 o C and 80 o C respectively. Calculate the amount of water that must be taken from each tank to prepare 40 kg of water at 50 o C.
10 gm of ice at -20 o C is dropped into a calorimeter containing 10 gm of water at 10 o C; the specific heat of water is twice that of ice. When equilibrium is reached, the calorimeter will contain
A liquid of mass M and specific heat S is at temperature 2t. If another liquid of thermal capacity 1.5 times at a temperature of t/3 of same mass is added to it, the resultant temperature will be
A steel ball of mass 0.1 kg falls freely from a height of 10 m and bounces to a height of 5.4 m from the ground. If the dissipated energy in this process is absorbed by the ball, the rise in its temperature is (specific heat of steel = 460 JKg -1 K -1 ) (g = 10 ms -2 ).
Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T o , while box B contains one mole of helium at temperature (7/3) T 0 .The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then the final temperature of the gases, T f in terms of T o is
A bullet made of lead moving with velocity v, hits a wall. Its 50 % kinetic energy is converted into heat, then increase in temperature will be : (s specific heat, J mechanical equivalent of heat)
A piece of lead is dropped from a height of 210 m. If 50 % of its striking energy is converted into heat calculate the rise in temperature (Specific heat of lead = 0.03 KCal / kg, J = 4200J/KCal and g = 10 m/s 2 )
If a bullet is suddenly stopped, the rise in its temperature is independent of
A piece of lead is dropped from a height of 210 m. If 50 % of its striking energy is converted into heat calculate the rise in temperature (Specific heat of lead = 0.03 KCal / kg, J = 4200J/KCal and g = 10 m/s 2 )
An ice block of mass 8 kg is dragged along a rough horizontal surface (=0.4) uniformly through 42 m. If all the heat produced is completely absorbed by block then mass of ice that melts is ( L= 80 cal/gm, g = 10m/s 2 )
A piece of ice of mass 100 g and at temperature 0 0 C is put in 200 g of water at 25 0 C. How much ice will melt as the temperature of water reaches 0 0 C ? (Take, latent heat of fusion of ice = 3.4 X 10 5 Jkg -1 ) [UK PMT 2015]
2 kg of ice at – 10°C is mixed with 5 kg of water at 20°C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg per °C and 0.5 kcal/kg/°C while the latent heat of fusion of ice is 80 kcal/kg
A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is [latent heat of ice is 3 . 4 × 10 5 J / k g a n d g = 10 N / k g ]
Steam at 100°C is passed into 20 g of water at 10°C. When water acquires a temperature of 80°C, the mass of water present will be [Take specific heat of water = 1 cal g – 1 o C and latent heat of steam = 540 cal g – 1 ]
A substance of mass m kg requires a power input of ‘P’ watt to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time ‘t’ sec. The latent heat of fusion of the substance is
A hammer of mass 1 Kg having speed of 50 m/sec hits an iron nail of mass 200g. If the specific heat of iron is 0.105 c a l / g 0 C and half the energy is converted into heat, the raise in the temperature of nail is
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100 0 C while the other one is at 0 0 C . If the two bodies are brought into contact, then, assuming no heat loss, the final common temperature is
The quantities of heat required to raise the temperature of two solid copper spheres of radii r 1 and r 2 ( r 1 = 1 . 5 r 2 ) through 1 K are in the ratio:
Liquid oxygen at 50K is heated to 300K at constant pressure of 1atm. The rate of heating is constant. Which of the following graphs represents the variation of temperature with time?
An electrically heated coil is immersed in a calorimeter containing 360 gm of water at 10 0 C. The coil consumes energy at the rate of 90W. The water equivalent of the calorimeter and coil is 40 gm. The temperature of water after 10 min is
A metal piece weighing 15 g is heated to 100 0 C and the immersed in a mixture of ice and water in thermal equilibrium. The volume of the mixture is found to be reduced by 0.15 c m 3 with the temperature of the mixture remaining constant. Find the specific heat of the metal. Given specific gravity of ice = 0.92, specific gravity of water at 0 0 C = 1.0, latent heat of fusion of ice = 80 c a l g – 1
Ice at 0 o C mixed with 200 gm of water at 20 o C . If final mixture at equilibrium contains five times water than ice,the initial mass of ice was ( Water C water = 1 cal / gm − α , L ice = 80 cal / gm − o C )
A calorimeter contains 0.2 kg of water at 30°C. 0.1 kg of water at 60°C is added to it, the mixture is well stirred and the resulting temperature is found to be 35°C. The thermal capacity of the calorimeter is
A copper block of mass 500 gm and specific heat 0.1 cal/gm°C is heated from 30°C to 290°C, the thermal capacity of the block is
The quantity of heat which can increase the temperature of x gm of a substance through t 1 °C can increase the temperature of y gm of water through t 2 °C is same. The ratio of specific heats of the substances is
Two liquids at temperatures 60 o C and 20 o C respectively have masses in the ratio 3 : 4 and their specific heats in the ratio 4 : 5. If the two liquids are mixed, the resultant temperature is
60 g of ice at 0 0 C is mixed with 60 g of steam at 100 0 C. At thermal eqilibrium, the mixture contains
Steam at 100 0 C is passed into 20 g of water at 10 0 C. When water acquires a temperature of 80 0 C, the mass of water present will be [Take specific heat of water 1 cal g –1 c –1 latent heat of steam = 540 cal/g -1 ]
30 gms of water at 30 o C is in a beaker. Which of the following, when added to water, will have greatest cooling effect? (Specific heat of copper = 0.1 cal/gm o C)
Radii of two steel spheres A and B are in the ratio 1:3. If same quantity of heat is supplied to the spheres, ratio of the rise of temperature of A and B is
A and B are two identical spheres the walls of the spheres are made of material having high thermal conductivity. A and B are connected to each other via a stopcock which is initially closed, A contains an ideal gas at pressure P. What will be the pressure of gas in A a long time after the stop cock is opened?
Statement I : Cooking food is difficult on hills. Statement II : The boiling point decreases with increase in pressure.
Steam at 100 0 C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15 0 C till the temperature of the calorimeter and its contents rises to 80 0 C . The mass of the steam condensed in kg is
Triple point of water is
2 kg of ice at – 20 0 C is mixed with 5 kg of water at 20 0 C in an insulating vessel having a negligilble heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg per 0 C and 0.5 kcal/kg/ 0 C while the latent heat of fusion of ice is 80 kcal/kg
Stream at 100 0 C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15 0 C till the temperature of the calorimeter and its content rises to 80 0 C . The mass of the steam condensed in kg is
Statement I : If one gram of ice is mixed with 1 g of water at 80 0 C , then the final temperature of mixture is zero. Statement II : Latent heat of ice 80 0 C cal/g.
An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20 0 C ? The temperature of boiling water is 100 0 C
A piece of ice of mass 50 g exists at a temperature of -20 0 C . Determine the total heat required to convert it completely to steam at 100 0 C . (Specific heat capacity of ice = 0.5 cal/ g – 0 C ; specific latent heat of fusion for ice = 80 cal/g and specific latent heat of varporisation for water =540 cal/g).
Three liquids A, B and C having same specific heat and mass m, 2m and 3m have temperature 20 0 C , 40 0 C and 60 0 C respectively. Temperature of the mixture when Column-I Column-II i. A and B are mixed p. 35 0 C ii. A and C are mixed q. 52 0 C iii. B and C are mixed r. 50 0 C iv. A, B and C all three are mixed s. 45 0 C t. None Now, match the given columns and select the correct option from the codes given below. Codes
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500 0 C and then placed on a large ice block. What is the maximum amount (approx.) of ice that can melt? (Specific heat of copper = 0.39 J / g 0 C latent heat of fusion of i c e = 335 J / g )
An ice cube of mass 0.1 kg at 0 0 C is placed in an isolated container which is at 227 0 C . The specific heat S of the container varies with temperature T according to the empirical relation S = A+BT, where A = 100 cal/kg-K and B = 2 × 10 – 2 cal / kg – K 2 . If the final temperature of the container is 27 0 C , find the mass of the container. (Latent heat of fusion for water = 8 × 10 4 cal / kg , specific heat of water = 10 3 cal / kg – K )
A metal piece weighing 15 g is heated to 100 0 C and then immersed in a mixture of ice and water at the thermal equilibrium. The volume of the mixture is found to be reduced by 0.15 cm 3 with the temperature of mixture remaining constant. Find the specific heat of the metal. Given specific gravity of ice = 0.92, specific gravity of water at 0 0 C = 1 . 0 , latent heat of fusion of ice = 80 cal – g – 1
A copper calorimeter of mass 1.5 kg has 200 g of water at 25 0 C . How much water (approx.) at 50 0 C is required to be poured in the calorimeter, so that the equilibrium temperature attained is 40 0 C ? (Sp. heat capacity of copper = 390 J/kg- 0 C )
When 0.400 kg of water at 30 0 C is mixed with 0 . 150 kg of water at 25 0 C contained in a calorimeter , the final temperature is found to be 27 0 C , find the water equivalent of the calorimeter.
How much does the internal energy of 1.0 g of ice at 0 0 C increase as it is changed to water at 0 0 C ? Neglect change in volume.
4 gm of steam at 100 0 C is added to 20 gm of water at 46 0 C in a container of negligible mass. Assuming no heat is lost to surrounding, the mass of water in container at thermal equilibrium is. Latent heat of water in container 540 cal/gm. Specific heat of water = 1 cal/gm- 0 C .
We can get vapour state of a substance through the process of: (i) boiling (ii) evaporation (iii) sublimation (iv) regelation
Specific heat of a substance can be: (i) finite (ii) infinite (iii) zero (iv) negative
420 joule of energy supplied to 10 g of water will raise its temperature by nearly:
Specificheat of.a.substance depends on its:
Specific heat of a gas undergoing adiabatic change is:
A test tube containing water is placed in boiling water so that its mouth remains outside the boiling water. Check the wrong statement:
20 g of boiling water is poured into an ice-cold brass vessel (specific heat 0.1 cal/g C 0 ) of mass 100 g. The resulting temperature is:
Which one of the following would raise the temperature of 20 g of water at 30°C most, when added to water? (Specific heat of copper = 0.1 cal/g C 0 )
100 g of ice is mixed with 100 g of water at 100°C. What will be the final temperature of the mixture?
Calculate the amount of heat (in calories) required to convert 5 g of ice at 0°C to steam at 100°C:
10 g of ice at 0°C is mixed with 100 g of water at 50°C. What is the resultant temperature of mixture?
A piece of ice of mass 50 kg is pushed with a velocity of 5 m/s along a horizontal surface. As a result of friction between the piece and the surface, the piece stops after travelling 25 m; the ice melted in this process is:
Two tanks A and B contain water at 30°C and 80°C respectively. The amount of water that must be taken from A and B to prepare 40 kg of water at 50°C :
A metal sphere of radius rand specific heats is rotated about an axis passing through its centre at a speed of n rotations per second. It is suddenly stopped and 50% of its energy is used in increasing its temperature. Then the rise in temperature of the sphere is:
19 g of water at 30°C and 5 g of ice at -20°C are mixed together in a calorimeter. What is the final temperature of the mixture? (Given, specific heat of ice = 0.5 cal g -1 (C 0 ) -1 and latent heat of fusion of ice = 80 cal g -1 )
Consider the following statements. (A) Specific heat capacity is the cause of formation of land and sea breeze. (B) The specific heat of water is more than land. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Consider the following statements. (A) The steam at 100°C causes more severe burn to human body than the water at 100°C. (B) The steam has greater internal energy than water due to latent heat of vaporization. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Consider the following statements. (A) When a hot liquid is mixed with a cold liquid, the temperature of the mixer is undefined for some time and then becomes nearly constant. (B) If two bodies at different temperature are mixed in a calorimeter, the total energy of the two bodies remains conserved. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Consider the following statements. (A) Change in internal energy in the melting process is due to change in internal potential energy. (B) In melting process, distance between molecules change but temperature remains constant. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Steam is passed into 54 gm of water at 30°C till the temperature of mixture becomes 90°C. If the latent heat of steam is 536 cal/gm, the mass of the mixture will be
The portion AB of the indicator diagram representing the state of matter denotes
A liquid is being converted into vapours at its boiling point; the specific heat of the liquid at this temperature will be:
During melting process, heat given to a body is utilised in:
The specific heat of metals at low temperature is:
1 g of ice at 0°C is converted into steam at 100°C. The amount of heat required to do so is:
A liquid of mass m and specific heat c is heated to a temperature T. Another liquid of mass (m/2) and specific heat 2c is heated to a temperature 2T. If these two liquids are mixed, the resulting temperature of the mixture is:
Two liquids of equal volume are thoroughly mixed. If their specific heats are C 1 , C 2 temperatures θ 1 , θ 2 and densities d 1 , d 2 respectively, the final temperature of the mixture is:
Steam at 100°C is passed into 20 g of water at 10°C. When water acquires a temperature of 80°C, the mass of water present will be : (Take specific heat of water =1 cal g -1 (C O ) -1 and latent heat of steam = 540 cal g -1 )
Consider the following statements. (A) Water can be made to boil without heating. (B) Boiling point of water is lowered by decreasing pressure.
Consider the following statements. (A) To drink chilled juice, we use ice cubes of 0°C instead of cold water at 0°C. (B) Ice tends to absorb heat from the juice for its melting. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Consider the following statements. (A) A solid material is supplied heat at constant rate.The temperature of the material is changing with the heat input as shown in Fig. If CD = 2AB then latent heat of vaporisation of substance is double that of fusion. (B) Latent heat of fusion ∞ AB and Latent heat of vaporisation ∞ CD. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false.
Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is free to move while that of B is held fixed: Some amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30 K, then the rise in temperature of the gas in B is:
Select the correct statement
Water used in automobiles as a coolant because
A piece of ice falls from a height h so that it melts completely. Only one – quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is (Latent heat of ice is 3.4 × 10 5 J k g – 1 and g = 10 N k g – 1 )
A liquid of mass M and specific heat S is at a temperature 2 t. If another liquid of mass M and thermal capacity 1.5 times, at a temperature of t/3 is added to it, the resultant temperature will be:
2kg of ice at − 20 ∘ C is mixed with 5kg of water at 20 o C . The water content of final mixture is (Latent heat of ice = 80 kcal/kg, specific heat of water = 1 k cal kg − 1 ∘ C − 1 specific heat of ice = 0 .5 k cal kg − 1 ∘ C − 1 )
10 gm of ice at -20°C is added to 10gm of water at 50°C. Specific heat of water = 1 cal / gm /°C, specific heat of ice = 0.5 cal / gm /° C. Latent heat of ice = 80 cal/gm. Then, resulting temperature is
5 gm of steam at 100°C is passed into 6 gm of ice at 0°C. If the latent heat of steam and ice in cal per gm are 540 and 80 respectively, then the final temperature is
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
In a pressure cooker, the cooking is fast, because
A liquid of mass M and specific heat S is at temperature 2t. If another liquid of thermal capacity 1.5 times at a temperature of t/3 of same mass is added to it, the resultant temperature will be
A tap supplies water at 10°C and another tap at 100°C. How must hot water must be taken so that we get 20 kg water at 35°C ?
A closed bottle containing water at 30°C is carried to the moon in a spaceship. If it is placed on the surface of moon, what will happen to the water as soon as the lid is opened ?
Pure water cooled to – 15°C is contained in a thermally insulated flask. Some ice is added into the flask. The fraction of water frozen into ice is :
A block of ice of mass 50 kg is pushed out on a horizontal plane with a velocity of 5 m/s. Due to friction, it comes to rest after covering a distance of 25 m. How much ice melts?
The height of a water spring is 50 m. The difference of temperature between the top and bottom of the spring is
Water of volume 2 L in a closed container is heated with a coil of 1 kW. While water is heated, the container loses energy at a rate of 160 J/s. In how much time the temperature of water rise from 27°C to 77°C? (Specific heat of water is 4.2 kJ/kg and that of the container is negligible).
Two spheres of radii in the two ratios 2 : 3 have specific heat in the ratio 3 : 2. What is the ratio of their thermal capacities?
5 g of ice at 0°C is mixed with 5 g of steam at 100°C. What is the final temperature of the mixture?
Two blocks of ice join together where passed. Which one of the following will appropriately account for this?
H calories of heat are required to raise the temperature of 1 mole of a monoatomic gas from 20°C to 30°C at constant volume, The amount of heat required (in calories) to raise the temperature of 2 moles of a diatomic gas from 20°C to 25°C at constant pressure is
When an ideal diatomic gas is heated at constant pressure, the fraction of heat energy supplied which increases the internal energy of the gas is
A substance of mass m kg requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance ?
Some quantity of heat is given to a substance. The quantity which determines the temperature of the body is
A tap supplies water at 10°C and another tap at 100°C. How much hot water must be taken so that we get 20 kg water at 35°C?
From what height a piece of ice at zero degree fall in order that it may melt on reaching the ground, assuming no loss of energy on the way : (J = 4.2 J / cal)
80 gm of water at 30 o C is poured on a large block of ice at 0 o C. The mass of ice that melts is
5 gm of steam at 100°C is passed into 6 gm of ice at 0°C. If the latent heat of steam and ice in cal per gm are 540 and 80 respectively, then the final temperature is
A closed bottle containing water on earth is carried to the moon in a spaceship. If it is placed on the surface of moon, what will happen to the water as soon as the lid is opened ?
A moving snowball is completely melted by its impact against a wall. The speed in ms − 1 of snow ball is
A copper block of mass 500 gm and specific heat 0.1 cal/gm 0 C is heated from 30 0 C to 290 0 C, the thermal capacity of the block is
Two spheres A and B have diameters in the ratio 1 : 2, densities in the ratio 2 : 1 and specific heats in the ratio 1 : 3; find the ratio of their thermal capacities
A ball of thermal capacity 10 cal / o C is heated to the temperature of furnace. It is then transferred into a vessel containing water. The water equivalent of vessel and the contents is 200 gm. The temperature of the vessel and its contents rises from 10 o C to 40 o C. What is the temperature of furnace ?
An electric kettle (rated accurately at 2.5kw) is used to heat 3 kg of water from 15°C to boiling point. It takes 9.5 minutes. Then the amount of heat that has been lost is
From what height should an ice block at – 20°C be freely released so that 84 % of its mechanical energy is converted into heat and it just melts as it reaches the ground (g = 10 ms – 2 specific heat of ice is 0.5cal/gm/°C and latent heat of fusion of ice is 80 cal/gm)
A bullet made of lead moving with velocity v, hits a wall. Its 50 % kinetic energy is converted into heat, then increase in temperature will be : (s specific heat, J mechanical equivalent of heat)
From what height should an ice block at – 20°C be freely released so that 84 % of its mechanical energy is converted into heat and it just melts as it reaches the ground (g = 10 ms – 2 specific heat of ice is 0.5cal/gm/°C and latent heat of fusion of ice is 80 cal/gm)
10 g of ice cubes at 0 0 C are released in a tumbler (water equivalent 55 g) at 40 0 C. Assuming that negligible heat is taken from the surroundings, the temperature of water in the tumbler becomes nearly (Take, L = 80 cal/g)
In an industrial process, 10 kg of water per hour is to be heated from 20 0 C to 80 0 C. To do this, steam at 150 0 C is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90 0 C, how many kg of steam is required per hour? (Take, specific heat of steam = 1 cal per g 0 C, latent heat of vaporisation = 540 cal g -1 )
A 10 W electric heater is used to heat a container filled with 0.5 kg of water. It is found that the temperature of water and container rises by 3K in 15 min. The container is then emptied, dried and filled with 2 kg of oil. The same heater now raises the temperature of container oil system by 2K in 20 min. Assume there is no heat loss in the process and the specific heat of water is 4200 J kg -1 K -1 , the specific heat of oil in the same limit is equal to
19 g of water at 30 0 C and 5 g of ice at – 20 0 C are mixed together in a calorimeter. What is the final temperature of the mixture? (Take, specific heat of ice = 0.5 cal g – 1 0 C – 1 and latent heat of fusion of ice = 80 cal g – 1 )
A piece of ice falls from a height h , so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is (Take, latent heat of ice is 3.4 X 10 5 ]/kg and g = 10 N/kg)
Equal masses of three liquids A , B and C have temperatures 10 0 C, 25 0 C and 40 0 C, respectively. If A and B are mixed, the mixture has a temperature of 15 0 C. If B and C are mixed, the mixture has a temperature of 30 0 C. If A and C are mixed, the mixture will have a temperature of
Consider the following statements. (A) Water can be made to boil without heating. (B) Boiling point of water is lowered by decreasing pressure.
