5 common bemariya or ilaj. Sehat hamri zindagi ka ahm or Khas hisa h or hamy mamoly sy zyda sehat mand rhny k liye apni sehat ki care krna zarori hota h. Ik tibi Toor pr strong jism or sehatmand dimag k liye humy apni aahistigion ka khiyal rakhna chai or dif…
Continue ReadingProblem 11.11. The low temperature reservoir of a Carnot engine is at 7°C and has an efficiency of 40%. It is desired to increase the efficiency to 50%. By how much degrees the temperature of hot reservoir be increased. m Problem 11.11. The low temperature r…
Continue ReadingProblem 11.10. A heat engine operates between two reservoirs at temperatures of 25°C and 300°C. What is the maximum efficiency for this engine? Problem 11.10 A heat engine opreats between two reservoirs at temperature of 25°c and 300°c. What is the maximum e…
Continue ReadingProblem 11.9. A heat engine performs 200J of work in each cycle and has efficiency of 20 percent. For each cycle of operation a) How much heat is absorbed and b) How much heat is expelled? Problem 11.9 A heat engine perform 200j of works in each cycle and ef…
Continue ReadingProblem 11.8. There is an increase of internal energy by 400 joules when 800 joules of work is done by a system. What is the amount of heat supplied during this process? Problem 11.8 There is an increase of internal energy by 400j when 800j of work is done b…
Continue ReadingProblem 11.7. In a certain process 400 J of heat are supplied to a system and at the sametime 150J of work are done by the system. What Is the increase in the internal energy of the system. Problem 11.7 In a certain process 400j of heat is supplied to a syste…
Continue ReadingProblem 11.6. A 2kg iron block is taken from a furnace where its temperature was 650°C and placed on a large block of ice at 0°C. Assuming that all the heat given up by the iron is used to melt the ice, how much ice is melted. A 2kg iron block is taken from a…
Continue ReadingProblem 11.5. a) Determine the average value of the kinetic energy of the particles of an ideal gas at 0°C and at 50°C: b) What is the kinetic energy per mole of an ideal gas at these temperatures? Problem 11.5 Determine the average value of the kinetic energ…
Continue ReadingProblem 11.4. Calculate the root mean square speed of hydrogen molecule at 800K. DATA: T = 800 K Vrms of H₂ =? K=1.38 x 10^-23 JK-¹ SOLUTION: n=m/M N/NA= m/M 1÷(6.02 x 10^23)=m/2 m = 3.32 x 10^-²4 g. or m = 3.32 x 10^-²7 kg Using Vrms= √(3kT/m) Vrms:√((3 x 1.…
Continue ReadingProblem 11.3. Find the change In volume of an aluminum sphere of 0.4m radius when It is heated from 0 to 100°C. Problem 11.3 Find the change in volume of an aluminium sphere of 0.4m radius when it is heated from0°C to 100 °c? Solution. . V1 = 4/3 3.14 r³ …
Continue ReadingProblem 11.2. A steel rod has a length of exactly 0.2cm at 30°C. What will be Its length at 60°C? A steel rod has a length of exactly 0.2cm at 30 °C what will be Its length at 60°C? Data. Solutions L1 = 0.2cm. …
Continue ReadingProblem 11.1. i) The normal body temperature is 98.4 F. What is this temperature on Celsius scale? ii) At what temperature do the Fahrenheit and Celsius scales coincide. Problem 11.1 The normal human body temperature is 98.4 f. What is temperature of Celsius…
Continue ReadingHEAT (PROBLEMS) Problem 11.1. i) The normal body temperature is 98.4 F. What is this temperature on Celsius scale? ii) At what temperature do the Fahrenheit and Celsius scales coincide. Problem 11.2. A steel rod has a length of exactly 0.2cm at 30°C. What w…
Continue ReadingPhysics 12th Class Problems 11. HEAT 12. ELECTROSTATICS 13. CURRENT ELECTRICITY 14. MAGNETISM AND ELECTROSTATICS 15. ELECTRICAL MEASURING INSTRUMENTS 16. ELECTROMAGNETIC WAVES AND ELECTRONICS 17. ADVENT OF MODERN PHYSICS …
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Continue ReadingProblem 10.15. Two converging lenses are 25 cm part. Focal length of each is 10 cm. An object is placed in front of one lens at 50 cm. Find the distance between the object and the final image? Data Focal length of each lens f1= f2 =f =10cm Distance between le…
Continue ReadingProblem 10.14. A convex lens forms image of an object on a fixed screen 20 cm from the lens. On moving the lens 60 cm towards the object, the image is again formed on the screen. What is the focal length of the lens?
Continue ReadingProblem 10.13. A converging lens of 4 dioptres is combined with a diverging lens of −2 dioptres. Find the power and focal length of the combination?
Continue ReadingProblem 10.12. A compound microscope has an objective with a focal length of 10 mm and a tube 100 mm long. An image is produced 250 mm from the eye piece when the object is 12 mm from the objective. What is the angular magnification?
Continue ReadingProblem 10.11. A Galilean telescope has an objective of 120 mm focal length and an eye piece of 50 mm focal length. If the image seen by the eye is 300 mm from the eye piece, what is angular magnification?
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