PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 The vapour pressure of a liquid Always increase's with temperature Always decreases with temperature Is independent of temperature Increase up to the boiling point
2 Which of the following molecules has the lowest average speed at 273 K. CO2 CO CH4 O2
3 Which of the following equations is the most general equation of state. Vander Waal's equation Dielectric equation Clasuaiua equation Kamberling Onnes equation
4 The velocity possessed by maximum fraction of molecules at a given temperature is called. Average velocity Root mean aquare velocity Most probable velocity None of the above
5 The vibration degrees of freedom for a linear and non liner poly atomic molecule of seven atoms each an respectively 30 and 29 30 and 32 28 and 29 None of above
6 An Ideal gas is one which obeys all the gas law at. Low pressure High Pressure Low and High temperature All condition of pressure and temperate re
7 The temperate of a gas below which only the gas cools when allowed to expand is know as. Inversion temperature Ideal temperature Critical temperature Joule Thomaon temperatu4re
8 The reciprocal of the coefficient of viscosity in called. Density Specific gravity Fluidity Conductance
9 The number of coordinates required to specify the position of all the atoms in a molecule is called number of degree of freedom. The vibration degrees of freedom of a linear molecule containing N atoms are 2N-5 2N -6 3N -5 N-6
10 The value of comprehensibility factor (z) = pV/nRTfor an ideal gas is equal to. R 1 2 3
11 At extremely low pressures, the van der Waals equations for one mole may be written as. PV = RT + Pb PV = RT PV = RT - a/V (P +a) (V-b) = RT
12 A gas obeying the van Waals equation will closely resemble and ideal gas if The parameters 'a' and 'b' are small 'a' is small but 'b' is large 'a' is large but 'b' is mall None of the above
13 For one mole a gas, the total kinetic energy is equal to. 2/3 Rt 3/2 RT 2/3 kT 3/2 kT
14 Which of the following is not a correct postulate of the kinetic theory of gases. The molecules are in random motion The gaseous collisions are perfectly elastic The average kinetic energies of different gases are equal at a particular temperature. The pressure exerted on the walls of the container is due to inter molecular forces.
15 The gases H2, N2, O2 and NH3 . H2 =2 , N2 = 28, O2 = 32 and NH3 =17 will effuse in the order. H2> N2> O2 > NH3 NH3 >O2 > N2 > H2 H2 > N2 > NH3 > O2 H2 >NH3 > N2 > O2
16 For a given mass of a gas, if pressure in reduced to half and temperature in doubled, then volume. 2V<sup>2</sup> 4V 8 V V<sup>2</sup>
17 For a given mass of a gas at constant temperature, if the value V becomes a times, the pressure will become. 3P P/3 9P 3P/T
18 Which of the following statement is not correct regarding the constant R . and in ideal gas equation PV= nRT Its value in independent of temperature Its value is independent of pressure In SI Units its value is 8.314 K<sup>-1</sup> mol<sup>-1</sup> It is called the universal gas constant per molecule.
19 For a given mass of a gas if temperature increase Pressure and volume remain Constance Volume increases provided pressure is kept constant Pressure decreases provided volume is constant Both volume and pressure decrease
20 Total pressure exerted by a mistress of two or more than two gases in a definite volume as any given temperature is equal to the sum of partial pressures which each gas would exert, if it occupied the same volume alone, at the same temperature This is a statement. Boyle's law Charle's law Graham's law Dalton's law
21 The constant temperature and pressure,the rates of effusion of various gases vary inversely as square root of their denature. This is a statement of. Boyle's law <div>Charles's law</div> Graham's law Daltons's law
22 Equal volumes of all gases, under similar conditions of temperature and pressure, contain equal number of molecules. This is a statement of. Graham's law Dalton's law Avogadro' law Boyle's law
23 The volume of given mass of gas at constant pressure is directly proportional to the absolute temperature.This is a statement of. Charles's law Boyle's law Avogadro's law Dalton's law
24 The volume of a given mass of gas at constant temperature varies inversely with the pressure. This is a statement of. Charlea's law Avogadro's law Boyle's law Dalton 's law
25 The SI unit of pressure is Pascal it is define da sa force per unit are of 1N/m2 one atmosphere of pressure is equal to. 760 mm of Hg 1 bar 101 k Pa 760 torr All are correct
26 Which of the following statement is not related to the characteristics of gaseous state. The inter molecular forces of attraction are not strong in gaseous state The gases do not have definite shape and volume The gases are characterized by low density. The gases have low comprehensibility
27 A theoretical link between quantum mechanics and thermodynamic is. Electrochemistry Kinetic theory of gases Spectroscopic analysis Statistical thermodynamics
28 Which of the following is not evoked in quantum theory? Schrodinger wave equation The rigid rotor approximation The particle in a box Boltzmann distribution
29 The Schrodinger equation when solved for any system gives. The mean force path The Polarizability The energy function The wave function
30 In quantum theory, which of the following tells us that the prediction of quantum mechanics must pass smoothly into those of classical mechanics as we progress in a continuous way from microsopic to macroecopic. Uncertainty principle Correspondence principle Probability distribution Aufbau principle
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