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NEET UG Kinetic Theory & Oscillations — practice questions — page 4

Explore 141 free Kinetic Theory & Oscillations questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetic Theory & Oscillations questions and exercises with answers

Showing questions 91–120 of 141.

A gas at 300 K is heated to 600 K at constant pressure. What happens to its volume?Read the answer and worked solution →A gas occupies 6 L at 2 atm. It is squeezed to 3 L at constant temperature. New pressure?Read the answer and worked solution →A mixture of 2 mol nitrogen and 3 mol argon has total pressure 10 atm. Partial pressure of nitrogen?Read the answer and worked solution →Which law adds partial pressures to give a mixture's total pressure?Read the answer and worked solution →Neon and oxygen in one vessel have partial pressures in the ratio 3:2. Ratio of their numbers of molecules?Read the answer and worked solution →In the kinetic theory of an ideal gas, collisions of molecules are assumed to beRead the answer and worked solution →A molecule of mass m and x-velocity vx rebounds elastically off a wall. Momentum change?Read the answer and worked solution →Which expression gives the pressure of an ideal gas from kinetic theory?Read the answer and worked solution →For an isotropic gas, the mean of vx² equals which fraction of the mean square speed <v²>?Read the answer and worked solution →Hydrogen of density 0.09 kg/m³ has rms speed 1840 m/s. What pressure does it exert?Read the answer and worked solution →What is the average translational kinetic energy of one molecule of an ideal gas at temperature T?Read the answer and worked solution →What is the rms speed of nitrogen molecules at 300 K, approximately?Read the answer and worked solution →At room temperature, molecular rms speeds in air are comparable toRead the answer and worked solution →If the absolute temperature of a gas becomes four times, its rms speedRead the answer and worked solution →At what temperature will O2 molecules have the same rms speed as H2 molecules at 300 K?Read the answer and worked solution →A gas is at 27 °C. To what temperature must it be heated to double its rms speed?Read the answer and worked solution →UF6 molecules with U-235 and U-238 have masses 349 u and 352 u. Ratio of their mean speeds?Read the answer and worked solution →A gas's diffusion rate varies with molecular mass m asRead the answer and worked solution →Why does a gas warm up when a piston is pushed in to compress it?Read the answer and worked solution →How many translational degrees of freedom does a molecule free to move in space have?Read the answer and worked solution →Molecules of a monatomic gas such as argon have which degrees of freedom?Read the answer and worked solution →A diatomic molecule treated as a rigid dumbbell has how many degrees of freedom in total?Read the answer and worked solution →Under equipartition, one vibrational mode of a molecule contributes what average energy?Read the answer and worked solution →What is the molar specific heat at constant pressure of helium treated as an ideal gas?Read the answer and worked solution →What is the ratio of specific heats γ for a rigid diatomic ideal gas?Read the answer and worked solution →A diatomic gas also has one active vibrational mode. What is its molar Cv?Read the answer and worked solution →A polyatomic molecule has 3 translational, 3 rotational and f vibrational modes. Molar Cv?Read the answer and worked solution →For any ideal gas, the difference Cp - Cv between molar specific heats equalsRead the answer and worked solution →Why do measured specific heats of Cl2 exceed rigid-model values?Read the answer and worked solution →How much heat raises 1 mol of argon by 20 K at constant volume? (R = 8.31 J/mol K)Read the answer and worked solution →

Worked practice questions

A gas at 300 K is heated to 600 K at constant pressure. What happens to its volume?

  1. It becomes half
  2. It stays the same
  3. It becomes double
  4. It becomes four times
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Correct answer: C. It becomes double

At fixed pressure volume is proportional to absolute temperature, so doubling T from 300 K to 600 K doubles V.

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A gas occupies 6 L at 2 atm. It is squeezed to 3 L at constant temperature. New pressure?

  1. 4 atm
  2. 2 atm
  3. 6 atm
  4. 1 atm
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Correct answer: A. 4 atm

Boyle's law keeps PV constant, so 2 atm × 6 L = P × 3 L gives P = 4 atm.

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A mixture of 2 mol nitrogen and 3 mol argon has total pressure 10 atm. Partial pressure of nitrogen?

  1. 4 atm
  2. 6 atm
  3. 5 atm
  4. 2 atm
Show answer and solution

Correct answer: A. 4 atm

Nitrogen is 2 of the 5 moles, so its partial pressure is 2/5 of 10 atm, which is 4 atm.

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