Physical Chemistry MCQ for Gpat | Physical Chemistry mcq

1. When there are no external forces, the shape of a liquid drop is determined by
(a) Surface tension of the liquid
(b) Density of liquid
(c) Viscosity of liquid
(d) Temperature of air only
2. Choose the wrong statement from the following.
(a) Small droplets of a liquid are spherical due to surface tension
(b) Oil rises through the wick due to capillarity
(c) In drinking the cold drinks through a straw, we use the phenomenon of capillarity
(d) Gum is used to stick two surfaces. In this process we use the property of adhesion
3. When the angle of contact between a solid and a liquid is 90°, then
(a) Cohesive force > Adhesive force
(b) Cohesive force < Adhesive force
(c) Cohesive force = Adhesive force
(d) Cohesive force >> Adhesive force
4. Raindrops are spherical in shape because of
(a) Surface tension
(b) Capillary
(c) Downward motion
(d) Acceleration due to gravity
5. Ammonia has a net dipole moment while boron trifluoride has zero dipole moment because
(a) Fluorides is more electronegative
(b) Fluorides is more electronegative
(c) Boron trifluoride is pyramidal in shape while NH3 is planar
(d) NH3 is pyramidal in shape while BF3 is planar
6. The SO4 consists of a central sulfur atom with four equivalent oxygen atoms. What should be the internal O-S-O bond angle be
(a) 6° (b) 9°
(c) 109.5° (d) 117
7. Which of the following statements is incorrect?
(a) Hydrogen can give an electropositive ion by losing its electrons
(b) Hydrogen can form an electronegative ion by gaining another electron
(c) Hydrogen can combine with some other elements by means of covalency
(d) Hydrogen can enter into a coordinate linkage with other atoms
8. The Phase rule is applicable to ____________
(a) Homogenous system
(b) Reversible system
(c) Irreversible system
(d) Heterogeneous system whether physical or chemical
9. A dilatometer is an apparatus used to measure
(a) Transition temperature
(b) Triple point
(c) Eutectic point
(d) All of these
10. The nature of bonding between Al and chlorine in AlCl3 is
(a) Electrovalent
(b) Covalent
(c) Covalent with polar character
(d) Coordinate covalent
11. Pick out the molecule which has zero dipole moment
(a) NH3 (b) H2
(c) BCl3 (d) SO2
12. “Equal volume of all gases at the same temperature and pressure contains equal number of molecules” is a statement of ____________
(a) Combined Gas Law
(b) Charle’s Law
(c) Boyle’s Law
(d) Avogadro’s Law
13. The entropy is measured in ____________
(a) Cal K–1 mol–1 (b) JK–1mol–1
(c) Entropy unit (d) All of above

14. Mixing of two or more gases is a ____________
(a) Spontaneous Process
(b) Non-spontaneous Process
(c) Reversible Process
(d) None of these
15. The free energy function (G) is defined as
(a) G = H + TS
(b) G = TS – H
(c) G = H – TS
(d) None of these
16. The Second Law of Thermodynamics stated that
(a) It is impossible to take heat from a hotter reservoir and convert it completely into work by a cyclic process without transferring a part of heat to acooler reservoir.
(b) It is impossible to transfer heat from a body at a lower temperature to one at higher temperature
(c) The efficiency of heat engine in always less than 1
(d) All of above
17. The unit in which surface tension is measured is:
(a) (b)–1
(c) (d) Dyne1.cm1
18. The reciprocal of viscosity is called ____________
(a) Surface tension
(b) Frictional resistance
(c) Fluidity
(d) None of these
19. A crystalline solid does not have one of the following properties:
(a) Anisotropy
(b) Sharp melting point
(c) Isotropy
(d) Definite and regular geometry
20. 36 g of glucose (molecular mass – 180) is present in 500 g of water,the molality of the solution is
(a) 0.2 (b) 0.4
(c) 0.8 (d) 1.0
21. The molarities of 0.1N HCl and 0.1 N H2 SO4is respectively:
(a) 0.1M HCl and 0.05 M H2 SO4
(b) 0.05 M HCl and 0.1 M H2 SO4
(c) 1 M HCl and 0.2 M H2 SO4
(d) 0.05 M HCl and 0.1 M H2 SO4
22. Which of the following includes all the aims of kinetics?
(i) To measure the rate of reaction
(ii) To be able to predict the rate of a reaction
(iii) To be able to establish the mechanism by which reaction occurs
(iv) To be able to control a reaction
(a) i , ii and iii (b) i and ii
(c) i and iii (d) i, ii, iii and iv
23. For first order reaction the rate constant K, has the unit(s)
(a) 1 mol–1 (b) Time–1
(c) (Mol/L)–1 (d) Time.mol L–1
24. Thermodynamics is applicable for ____________
(a) Microscopic system
(b) Macroscopic system
(c) Heterogenous system
(d) Homogenous system
25. A system in which no thermal energy pass into or out of the system is called ____________
(a) Adiabatic System (b) Open System
(c) Closed System (d) Reversible System
26. An alfa particle is ____________
(a) An electron
(b) One neutron and one proton
(c) Two protons and two neutrons
(d) An X-ray emission
27. In a Geiger Muller counter, one count is directly due to____________
(a) A secondary electron
(b) A primary electron
(c) Many electron and ions
(d) A beta particle
28. Following is an example of extensive properties__________
(p) Mass                                                                                                                                                                      (q) Pressure
(r) Temprature
(s) Volume
(a) (p) and (q) (b) (p) and (r)
(c) (q) and (r) (d) (p) and (s)

29. Following all are the examples of endothermic process, except one
(a) Melting of solid salts
(b) Evaporation of water
(c) Producing sugar by photosynthesis
(d) Mixing of water with calcium chloride

30. At a triple point ____________
(a) Both the temperature and pressure are fixed
(b) Only temperature is fixed
(c) Only pressure is fixed
(d) Sometimes temperature and sometime pressure
are fixed

Answer Keys

1. (a) 2. (c) 3. (c) 4. (a) 5. (d) 6. (c) 7. (d) 8. (d) 9. (a) 10. (c)                                                                                  11. (c) 12. (d) 13. (d) 14. (a) 15. (c) 16. (d) 17. (b) 18. (c) 19. (c) 20. (b)                                                                21. (a) 22. (d) 23. (b) 24. (b) 25. (a) 26. (c) 27. (c) 28. (d) 29. (d) 30. (a)

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