Tiêu đề PHY CHAP WISE PRACTICE SHEET 2024 ✅

Prepared By XII – PHYSICS Sir Danish Ahmed 1 Exams Practice Sheet,2024 THE MASTERS’ COACHING CENTRE (Gulshan Campus) | 1ST ONLINE COACHING FOR SINDH BOARDS EDUCATION | KARACHI BOARD | For Admission details Whatsapp 03323900066 First watch “XII Examination Sheet, 24 Guide” video on Sir Danish’s YouTube channel then follow this sheet for your final exams preparation. CHAPTER WISE THEORY QUESTIONS FOR SECTION “A” AND “B” CH – 11: HEAT Q 1: Define co – efficient of linear and co – efficient of cubical expansion, also derive the relation between them (Prove  = 3) Q 2: Derive the equation P = ρ ̅̅̅ ̅. Q 3: Prove that K.E α T Q 4: Prove Boyle’s law and Charles’ law on the basis of kinetic molecular theory of gases. Q 5: Derive CP – CV = R. Q 6: State the first law of thermodynamics. Apply this law on: (i) Isobaric process (ii) isochoric process (iii) Isothermal Process (iv) Adiabatic process Q 7: State two laws of the 2nd law of thermodynamics and prove that they are equivalent. Q 8: What is heat engine? Describe working of a Carnot engine & derive an equation for its efficiency. REASONS: 1) It is observed that when a mercury bulb of a glass thermometer is put in a flame, the column of mercury first descends and then rises. Explain it. 2) Why is specific heat at constant pressure greater than the specific heat at constant volume? 3) Why are there two different molar specific heat of a gas? CH – 12: ELECTROSTATICS Q 1: Derive an expression for electric flux passes through a sphere when a point charge place at the center of sphere. Q 2: Derive an expression for electric intensity close to a non-conducting infinite sheet of charge. Q 3: Define electric intensity and potential difference. Derive relation between electric intensity Q 4: and potential difference. Q 5: Define capacitor and capacitance. On what a factor does the capacitance of any capacitor depends. Derive an expression for the capacitance of a parallel plate capacitor when: (a) The space between two plates is completely filled with air. (b) The space between the two plates is completely filled with dielectric slab. CH – 13: ELECTRIC CURRENT Q 1: State and explain Ohm’s law Explain the factors on which it depends. Derive a relation between resistance and its dimensions Q 2: How the resistance of a conductor does depends upon temperature. Derive the equation for the resistance at a given temperature. Q 3: Define P.D and E.M.F. Both are measured in volts. What is the difference between these concepts?
Prepared By XII – PHYSICS Sir Danish Ahmed 2 Exams Practice Sheet,2024 THE MASTERS’ COACHING CENTRE (Gulshan Campus) | 1ST ONLINE COACHING FOR SINDH BOARDS EDUCATION | KARACHI BOARD | For Admission details Whatsapp 03323900066 CH – 14: MAGNETISM AND ELECTROMAGNETISM Q 1: Derive an expression for torque on a current carrying rectangular coil placed in magnetic field. Q 2: Describe J.J Thomson experiment for the e/m ratio of electron & derive an expression for it Q 3: State Ampere circuit law Derive an expression for the magnetic field of induction inside a current carrying long solenoid Q 4: State Faraday’s laws of electromagnetic induction and Lenz’s lawn Q 5: Define and explain the terms self – induction and mutual – induction Q 6: Write down the construction and working of A.C Generator Q 7: Define transformer. Write down its construction and working and derive related expressions? CH – 15: ELECTRICAL MEASURING INSTRUMENTS Q 1: Describe with the diagram the working of a moving coil galvanometer. Show that the deflection is directly proportional to the current. Q 2: Describe the conversion of galvanometer into ammeter and voltmeter Q 3: What is meant by balanced wheat stone bridge? Derive an expression of it CH – 16: ELECTROMAGNETIC WAVES AND ELECTRONICS Q 1: Explain the working of diode as a rectifier. Q 2: What is transistor? Explain the working of pnp and npn transistor (Transistor as an amplifier) CH – 17: ADVENT OF MODERN PHYSICS Q 1: Give the postulates and the consequences of Special theory of relativity. Q 2: What is black body and black body radiations? State the laws governing the black body radiation. Give their mathematical expressions Q 3: Define photoelectric effect. Define photo electric effect. Explain it on the basis of the quantum theory of light and obtain Einstein’s photo electric equation Q 4: What is Compton Effect? Explain it on the basis of Quantum theory. Derive a relation for the Compton’s shift CH -18: THE ATOMIC SPECTRA Q 1: State the postulates of Bohr’s atomic model & (i) Derive an expression for the radius of nth orbit. (ii) The energy of an electron in the nth shell of a hydrogen atom. (iii) The wave lengths of the photons emitted in a hydrogen spectrum. Q 2: What is LASER? Describe the construction and working of Ruby laser. CH – 19: THE ATOMIC NUCLEUS Q 1: Define radioactivity. Explain the law of radioactive decay. Write the equation showing the change in the parent nuclei by α, β and γ decay. Q 2: What is nuclear fission and fusion reaction? Discuss fission chain reaction. CH – 20: NUCLEAR RADIATIONS Q 1: Write down the construction and working of Wilson cloud chamber. Q 2: Describe the construction and working of Geiger counter.
Prepared By XII – PHYSICS Sir Danish Ahmed 3 Exams Practice Sheet,2024 THE MASTERS’ COACHING CENTRE (Gulshan Campus) | 1ST ONLINE COACHING FOR SINDH BOARDS EDUCATION | KARACHI BOARD | For Admission details Whatsapp 03323900066 First watch “XII Examination Sheet, 24 Guide” video on Sir Danish’s YouTube channel then follow this sheet for your final exams preparation. CHAPTER WISE NUMERICALS FOR SECTION “B” CH – 11: HEAT TOPIC – 1: HEAT AND TEMPERATURE: Q 1: The body temperature is 98.4 o F. What is this temperature on Celsius scale? [Ans: 36.89 oC] Q 2: At what temperature do the Fahrenheit and Celsius scales coincide? [Ans: - 40] [2006] Q 3: Celsius thermometer in a laboratory reads the surroundings temperature as 30 oC what is the temperature in the Fahrenheit and absolute scale? [Ans: 86 F, 303 K] TOPIC – 2: THERMAL EXPANSION: Q 1: A steel rod has a length of 10 m at a temperature of 25 o C. What will be the increase in length if the temperature is raised to 35 o C? Given α = 1.1 x 10 – 5 K – 1 . [Ans: 1.1 x 10 – 3 m] Q 2: A steel rod has a length of exactly 0.2 cm at 30 o C. What will be its length at 60 o C? α for steel = 1.1 x 10-5 C -1 . [Ans: 0.20066 cm] [2019] Q 3: Find the change in volume of an aluminum sphere of 0.4 m radius when it is heated from 0 oC to 100 o C. α = 2.4 x 10-5 C – 1 . [Ans: 0.00193 m 3 ] [2006] Q 4: Find the change in volume of brass sphere of 0.6 m diameters when it is heated from 30 oC to 100 o C. α = 1.9 x 10 – 5 C – 1 [Ans: 4.5 x 10-4 m 3 ] [2008] Q 5: A steel bar is 10 m in length at – 2.5 o C. What will be the change in its length at 25 oC? β for steel = 3.3 x 10 – 5 K – 1 . [Ans: 3.025 x 10 – 3 m] [2002 PE] Q 6: A cylinder of diameter 1 cm at 30 o C is to be slide into a hole in a steel plate. The hole has a diameter of 0.99970 cm at 30 o C. To what temperature must the plate be heated? α = 1.1 x 10 – 5 C – 1 . [Ans: 57.28 o C] [2005] Q 7: A brass ring of 20 cm diameter is to be mounted on a metallic rod of 20.02 cm diameter at 20 o C. To what temperature should the ring be heated? α = 1.9 x 10 – 5 C – 1 . [Ans: 72.63 oC] TOPIC – 3: GAS LAWS: [1983] Q 1: A tank containing 0.1 m 3 of nitrogen at room temperature and at a pressure of 8 x 10 6 N / m 2 are connected through a valve to an empty tank of volume 0.4 m 3 . The valve is opened and the nitrogen is allowed to expand. After the system returns to room temperature, what is the pressure of the tank? [Ans: 1.6 x 10 6 N/m 2 ]
Prepared By XII – PHYSICS Sir Danish Ahmed 4 Exams Practice Sheet,2024 THE MASTERS’ COACHING CENTRE (Gulshan Campus) | 1ST ONLINE COACHING FOR SINDH BOARDS EDUCATION | KARACHI BOARD | For Admission details Whatsapp 03323900066 [1991] Q 2: One gram mole of a gas occupies a volume of 24.93 m 3 at a pressure of 500 N/m 2 . Find the temperature of the gas in centigrade. [Ans: 1226.45 oC] [1996] Q 3: A tank contains 20 liters of air at 30 oC and 5.01 x 10 5 N/m 2 pressure. What is the mass of air and what volume it occupy at one atm pressure and at 0 o C? The average molecular mass of air is 28.8 g / mol. [Ans: 114.3 g, 0.089 m 3 ] [2000] Q 4: Calculate the volume occupied by a gram mole of gas at 10 oC and pressure of one atmosphere. 1 atm = 1.01 x 10 5 N/m 2 . [Ans: 0.023 m 3 ] [2003 P.M] Q 5: An air storage tank whose volume is 110 lit contains 2 kg of air at a pressure of 15 atm. How much air would have to be forced into the tank to increase the pressure to 18 atm, assuming no change in temperature. [Ans: 0.4 kg] [2009] Q 6: A scientist stores 22 g of a gas in tank at 1200 atm. Overnight the tank develops slight leakage and the pressure drops to 950 atm. Calculate the mass of the gas escaped. [Ans: 4.59 g] Q 7: An air storage tank whose volume is 112 liters contains 3 kg of air at a pressure of 18 atmospheres. How much air would have to be forced into the tank to increase the pressure to 21 atmospheres, assuming no change in temperature? [Ans: 0.5 kg] Q 8: Calculate volume occupied by a gram mole of a gas at 0oC& at a pressure of 1 atm. [Ans: 0.0224 m3 ] TOPIC – 4: ROOT MEAN SQUARE SPEED: [1985][1998][2002 P.M] Q 1: Find root mean square velocity of hydrogen gas molecule at 100 oC takes the mass of the hydrogen molecule 3.32 x 10 – 27 kg. [Ans: 2156.6 m/s] [1990] Q 2: At certain temperature the average K.E of hydrogen molecule is 6.2 x 10 – 21 J. If the mass of hydrogen molecule is 3.32 x 10 – 27 kg then find temperature and mean square velocity of hydrogen molecule. [Ans: 299.5 K, 3.735 x 106 m/s] [1996] Q 3: Find the root mean square speed of the nitrogen molecule at 27 o C. Mass of nitrogen molecule is 4.67 x 10-26 kg. [Ans: 515.7 m/s] [2000] Q 4: Determine the average value of kinetic energy of gas at 300 K. [Ans: 6.21 x 10 – 21 J] [2004] Q 5: Calculate density of hydrogen gas, considering it to be an ideal gas when the R.M.S of hydrogen molecule is 1850 m/s at 0 oC and at 1 atm pressure. [Ans: 0.088 kg/m 3 ] [2006] Q 6: Calculate R.M.S speed of hydrogen molecule at 800 K. [Ans: 3158.6 m/s] [2014] Q 7: Find root mean square speed of oxygen molecule at 800 K. Its molar mass is 32 gm. Q 8 a: Determine the average value of the kinetic energy of the particles of an ideal gas at 0 oC and at 50 o C. [Ans: 5.65 x 10 – 21 J, 6.68 x 10 – 21 J] Q 8 b: What is K.E per mole of an ideal gas at these temperature?[Ans: 3404.5 J/mol, 4026.2 J/mol]