Recent questions in 12th Science Maharashtra Board

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1 answer 184 views

The second law of thermodynamics deals with transfer of: (A) work done (B) energy (C) momentum (D) heat

asked May 30, 2022 in Chapter4:Thermodynamics by Mahendra (675 points)

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1 answer 182 views

Efficiency of a Carnot engine is large when (A) TH is large

asked May 30, 2022 in Chapter4:Thermodynamics by Mahendra (675 points)

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1 answer 206 views

Which of the following is an example of the first law of thermodynamics?

asked May 30, 2022 in Chapter4:Thermodynamics by Mahendra (675 points)

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1 answer 162 views

A gas in a closed container is heated with 10J of energy, causing the lid of the container to rise 2m with 3N of force

asked May 30, 2022 in Chapter4:Thermodynamics by Mahendra (675 points)

+1 vote

1 answer 106 views

Find the temperature of a blackbody if its spectrum has a peak at

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 150 views

A small-blackened solid copper sphere of radius 2.5 cm is placed in an evacuated chamber.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 114 views

Earth’s mean temperature can be assumed to be 280 K.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 179 views

Compare the rates of emission of heat by a blackbody maintained at 727 ºC and at 227ºC

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 170 views

The emissive power of a sphere of area 0.02 m2 is 0.5 kcal s-1 m-2. What is the amount of heat radiated

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 158 views

Energy is emitted from a hole in an electric furnace at the rate of 20 W, when the temperature of the furnace is 727 ºC.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 137 views

Calculate the energy radiated in one minute by a blackbody of surface area 100 cm2 when it is maintained at 227 ºC.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 185 views

Calculate the average molecular kinetic energy (i) per kmol (ii) per kg (iii) per molecule of oxygen at 127 ºC

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 184 views

Find kinetic energy of 5 litre of a gas at S.T.P. given standard pressure is 1.013 × 105 N/m2

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 126 views

Compare the rms speed of hydrogen molecules at 127 ºC with rms speed of oxygen molecules at 27 ºC

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 108 views

At what temperature will oxygen molecules have same rms speed as helium molecules at S.T.P.?

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 129 views

Show that rms velocity of an oxygen molecule is 2 times that of a sulfur dioxide molecule at S.T.P.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 204 views

A gas in a cylinder is at pressure P. If the masses of all the molecules are made one third of their original

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 162 views

Two vessels A and B are filled with same gas where volume

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

0 votes

1 answer 127 views

Calculate the ratio of mean square speeds of molecules of a gas at 30 K and 120 K.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

+1 vote

1 answer 115 views

State and prove Kirchoff’s law of heat radiation.

asked May 30, 2022 in Chapter3:Kinetic Theory of Gases and Radiation by nehapatil (3.2k points)

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