Physics question and answers for February 25, 2024
- Q A circular wire of radius R placed on a horizontal smooth surface is made t rotate about a fixed vertical axis passing through its center as shown If break ing...
- Q closed system having a mass of 50 kg has an initial velocity of 10 m s Subsequently its velocity increases to 30 m s and its elevation also rises by...
- Q of law of thermodynamics A Enegy can neither be created nor be destroy B The total energy of the universe remains constant C Enthalpy change depends only upon initial and...
- Q A closed system undergoes a thermodynamic cycle consisting of four separate and distinct processes The heat and work transferred in each process are as tabulated below Work transfer in kJ...
- Q The given P V diagram represents the thermodynamic cycle of an engine operating with an ideal monoatomic gas The net workdone by the gas in one cycle is P 2Pg...
- Q Suppose one mole of an ideal gas undergoes the reversible cycle ABCA shown in the P V diagram above where AB is an isotherm The molar heat capacities are C...
- Q In an ideal Brayton cycle air from the atmosphere at 1 atm 300K is compressed to 6 atm and the maximum cycle temperature is limited to 1100K by using a...
- Q A thermal machine operates under the ideal Rankin cycle the temperature in the boiler is 2000K The water vapor enters the boiler at 9MPa and 120C comes out at 9MPa...
- Q An ideal monatomic gas is taken through a thermodynamic process from A to B as shown Heat supplied to the gas in the process is P 2Pot 1 3P V...
- Q Question 22 7 joules of heat is required to raise the temperature of an ideal diatomic gas A 7 5 at constant pressure from 30 C to 35 C amount...
- Q A hydrogen like atom atomic number Z is in higher excited state of quantum number n This excited atom can make a transition to the first excited state by successively...
- Q 5 5 6 a A horizontal drum belt drive carries the belt over a semicircle around it The drum has a diameter of 1 m and when it rotates 400...
- Q The curved path in Fig 18 23 lies on the 350 K isotherm for an deal gas with y 1 4 a Calculate the net work done on the gas...
- Q b Water enters at the outer cylinder co axial double pipe heat exchanger at 40 C and leaves at 70 C hot gases enter inner cylinder at 305 C and...
- Q c A heat engine employing Carnot s cycle with an efficiency n 20 is used as a refrigerating machine the thermal reservoirs being the same Find the coefficient of performance...
- Q A closed piston cylinder device contains 0 5 kg of carbon dioxide CO initially at 300 K and 100 kPa The carbon dioxide is now slowly expanding in an isobaric...
- Q A cube of ice of mass 49 gm at 0 C is placed in an adiabatic container having negligible heat capacity and 100 gm water at 32 C Ice melts...
- Q Example 3 10 A system contains 0 15 m of a gas at a pressure of 3 8 bar and 150 C It is xpanded adiabatically till the pressure falls...
- Q c Calculate the entropy change when 3 g of ice is converted into steam and is then heated to 140 C under constant pressure Given that specific heat of water...
- Q b The efficiency of a Carnot s engine is 40 when the temperature of the sink is 27 C What is the temperature of the source In order to raise...
- Q efficiency in terms of temperatures of its heat reservoirs b The efficiency of a Carnot s engine is 40 when the temperature of the sink is 27 C What is...
- Q b Show that the heat transferred during an infinitesimal quasistatic process of an ideal gas can be written as SQ CV vdp VdP nR where n denotes the number of...
- Q A closed system undergoes a change of state by process 1 2 for which Q 10J and W 2 5J The system now returns to its original state by different...
- Q A standing wave is formed in a long tube by a tuning fork of frequency 500 Hz kept at its open end and other end is closed b a movable...
- Q Answer to each question will be evaluated according to the following marking scheme Full Marks 3 If ONLY the correct option is chosen Zero Marks 0 In all other cases...
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