CBSE Class 11 (Science) Kinetic Theory of Gases — practice questions
81 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Kinetic Theory of Gases in the app →A diatomic ideal gas has $C_v = \tfrac{5}{2}R$. Its $C_p$ and ratio $\gamma$ are:The introduction of atomic theory in modern science is credited to:Equal volumes of all gases at the same conditions hold:The number of molecules in 22.4 litres of any gas is called:The mass of 22.4 litres of a gas at STP equals its:Standard temperature at STP is taken as:The amount of substance in 22.4 litres at STP is one:In the kinetic theory, collisions between molecules are taken as:Elastic collisions in a gas imply the conservation of:Molecules of a gas are described as being in motion that is:The average kinetic energy of a gas molecule depends only on:A molecule free to move in space needs how many coordinates?A molecule confined to a plane has how many degrees of freedom?Motion of a body as a whole from one point to another is called:A gas like argon has which kind of degrees of freedom only?Argon is an example of which kind of gas?The mean free path in gases is of the order of:Compared with solids, atoms in gases are much:Molecules in a gas move at speeds of the order of the speed of:Who discovered, in 1661, the gas law relating pressure and volume at fixed temperature?The kinetic theory of gases was mainly developed byWhich ancient Indian school of thought, founded by Kanada, gave a detailed atomic view of matter?In the Vaiseshika atomic theory, what was a molecule of two atoms called?John Dalton proposed his atomic theory mainly to explain which laws?By Gay Lussac's law, combining gas volumes areWhat is the approximate size of an atom?How does the force between two atoms behave with separation?What is the value of the Boltzmann constant in SI units?How is the universal gas constant R related to the Boltzmann constant kB?Under which conditions does a real gas behave most like an ideal gas?A gas at 300 K is heated to 600 K at constant pressure. What happens to its volume?A gas occupies 6 L at 2 atm. It is squeezed to 3 L at constant temperature. New pressure?A mixture of 2 mol nitrogen and 3 mol argon has total pressure 10 atm. Partial pressure of nitrogen?Which law adds partial pressures to give a mixture's total pressure?Neon and oxygen in one vessel have partial pressures in the ratio 3:2. Ratio of their numbers of molecules?In the kinetic theory of an ideal gas, collisions of molecules are assumed to beA molecule of mass m and x-velocity vx rebounds elastically off a wall. Momentum change?Which expression gives the pressure of an ideal gas from kinetic theory?For an isotropic gas, the mean of vx² equals which fraction of the mean square speed <v²>?Hydrogen of density 0.09 kg/m³ has rms speed 1840 m/s. What pressure does it exert?What is the average translational kinetic energy of one molecule of an ideal gas at temperature T?What is the rms speed of nitrogen molecules at 300 K, approximately?At room temperature, molecular rms speeds in air are comparable toIf the absolute temperature of a gas becomes four times, its rms speedAt what temperature will O2 molecules have the same rms speed as H2 molecules at 300 K?A gas is at 27 °C. To what temperature must it be heated to double its rms speed?UF6 molecules with U-235 and U-238 have masses 349 u and 352 u. Ratio of their mean speeds?A gas's diffusion rate varies with molecular mass m asWhy does a gas warm up when a piston is pushed in to compress it?How many translational degrees of freedom does a molecule free to move in space have?Molecules of a monatomic gas such as argon have which degrees of freedom?A diatomic molecule treated as a rigid dumbbell has how many degrees of freedom in total?Under equipartition, one vibrational mode of a molecule contributes what average energy?What is the molar specific heat at constant pressure of helium treated as an ideal gas?What is the ratio of specific heats γ for a rigid diatomic ideal gas?A diatomic gas also has one active vibrational mode. What is its molar Cv?A polyatomic molecule has 3 translational, 3 rotational and f vibrational modes. Molar Cv?For any ideal gas, the difference Cp - Cv between molar specific heats equalsWhy do measured specific heats of Cl2 exceed rigid-model values?How much heat raises 1 mol of argon by 20 K at constant volume? (R = 8.31 J/mol K)What is the internal energy of 2 mol of helium at 300 K? (R = 8.31 J/mol K)Why are Cp and Cv nearly equal for a solid?What is meant by the mean free path of a gas molecule?How does the mean free path depend on the molecular diameter d?Gas pressure is doubled at constant temperature. What happens to the mean free path?Why does gas from a leak spread slowly through a room?What is the approximate mean free path of air molecules at STP?Why do air molecules in a room not all settle on the floor under gravity?Where does a gas in equilibrium in a container exert pressure?Treating water molecules as closely packed in liquid water, the estimated molecular radius is aboutAverage distance between molecules of water vapour at 100 °C and 1 atm is aboutWater vapour at 100 °C and 1 atm has density 0.6 kg/m³. Fraction of volume filled by molecules?Who proposed that equal gas volumes at equal T and P have equal molecule numbers?A gas's molecules carry translational KE of 1.5 × 10^5 J per cubic metre. Its pressure isIgnoring vibrations, what is γ = Cp/Cv for a nonlinear polyatomic ideal gas?Who published Hydrodynamica in 1738, laying the basis for the kinetic theory of gases?Which physicist introduced the concept of the mean free path in 1857?Einstein (1905) and Smoluchowski (1906) supported kinetic theory with papers onWhich Roman philosopher, around 50 BC, said static bodies are made of rapidly moving atoms?Which physicist generalised Maxwell's velocity distribution in 1871?Kinetic theory assumes the total volume of the molecules themselves is