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Pakistan's MCQ Practice Library for Competitive Exams

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Recently added practice questions

4752. The expression for entropy change given by, ?S = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?
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A. Simultaneous heating and expansion of an ideal gas

B. Heating of a substance

C. Reversible isothermal volume change

D. Cooling of a substance

4753. The experimentally determined overall order of the reaction, A + B ? C + D, is two. Then the__________________?
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A. Reaction may be elementary with molecularity of 2

B. Reaction is elementary with a molecularity of 2

C. Reaction is elementary but the molecularity may not be 2

D. Molecularity of the reaction is 2, but the reaction may not be elementary

4754. The expected number of RBCs in a single drop, or microliter, of blood is _________ million in Men.
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A. 3.2 to 7.2 million

B. 3.4 to 6.8 million

C. 4.5 to 6.2 million

D. 4.0 to 5.2 million

4756. The expectations augmented Phillips curve was the Work of which group of economists ?
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A. Monetarists

B. Keynesian.

C. New classical economists

D. Marxists.

4758. The example of spherical pair is_____________________?
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A. ball bearing and roller bearing

B. lead screw of a lathe

C. bolt and nut

D. ball and socket joint

E. none of the above

4759. The exact formula for sodium hexametaphosphate is___________________?
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A. [(NaPO6)13]

B. [(NaPO2)6]

C. [(NaPO3)13]

D. None of the above

4760. The evidence of the witnesses in attendance to be taken orally in_________________?
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A. Beyond Court

B. Open Court

C. None of the these

D. None of the above

4761. The evidence of the witnesses in attendance to be taken orally in_________________?
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A. Open Court

B. None of the these

C. Beyond Court

D. None of the above

4762. The evaporative cooling in the respiratory tract of dogs is called?
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A. All of these

B. Vasoconstriction

C. Vasodilation

D. Panting
4764. The Ethyl alcohol (Ethanol) is more effective when mixed with water and used as_____________?
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A. 20 to 30 percent

B. 10 to 20 percent

C. 40 to 50 percent

D. 60 to 70 percent
4765. The Ethyl alcohol (Ethanol) is more effective when mixed with water and used as_____________?
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A. 60 to 70 percent

B. 40 to 50 percent

C. 20 to 30 percent

D. 10 to 20 percent

4766. The Estimation and testing of hypothesis are main branches of ________________?
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A. Statistical Inference

B. Regression

C. Probability distribution

D. Sampling

4772. The equilibrium price clears the market it is the price at which _________________?
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A. Buyers spend all their money

B. C and D

C. Excess demanded equals quantity

D. Everything is sold

E. Quantity demanded equal quality supplied

4773. The equilibrium constant of a catalytic chemical reaction _______________ due to the presence of?
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A. atalyst.

B. Decreases

C. Remain unaffected

D. Increases

E. Unpredictable from the data

4774. The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the__________________?
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A. Kinetics of the reaction

B. Temperature of the system

C. Presence or absence of inerts

D. Pressure of the system
4775. The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 PA2) is for_______________________?
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A. Liquid M.T.C. by Higbie penetration theory

B. Steady state diffusion for stagnant case

C. Ficks second law of diffusion

D. None of these

4778. The equation of continuity holds good when the flow____________________?
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A. is steady

B. velocity is uniform at all the cross sections

C. none of the above

D. is one dimensional

E. all of the above
4779. The equation of continuity holds good when the flow __________________?
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A. velocity is uniform at all the cross sec-tions

B. none of the above

C. all of the above

D. is one dimensional

E. is steady

4780. The environment where an organism lives is__________________?
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A. Girding

B. Habitat

C. Logging

D. None of the above

4781. The entrepreneurs undertake new development activities :
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A. By investing their savings

B. By roping in rich capitalists

C. By securing credit from the banks

D. By securing grants from the government

4782. The entrance and exit curves of a rotary have_______________?
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A. equal radii but pavement width is more at entrance than at exit curve

B. different radii and different widths of pavement

C. equal radii and equal widths of pavement

D. equal pavement widths but radius is more at entrance curve than at exit curve

4783. The Enlightenment in European history refers to which of the following ?
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A. The power given to absolute monarchs by God

B. A period in the 18th century that celebrated industry

C. The revelation of religious truths through meditation

D. A period in which reason was celebrated as enabling human knowledge and possibly human perfection
4784. The engineers and scientists analytical jobs needs?
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A. creativity

B. problem solving

C. training

D. Both A and B
4787. The energy of molecular motion appears as________________?
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A. potential energy

B. friction

C. increase in pressure

D. surface tension

E. heat
4788. The energy of activation of a chemical reaction ?
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A. Is same as heat of reaction at constant pressure

B. Is the minimum energy which the molecules must have before the reaction can take place

C. Varies as fifth power of the temperature

D. Both B. and C.

4789. The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
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A. longer wavelength

B. wavelength has nothing to do with it

C. none of the above

D. shorter wavelength

E. remains same at all wavelengths

4791. The encapsulation of transistor is necessary for__________?
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A. preventing radio interference

B. avoiding loss of free electrons

C. mechanical ruggedness

D. preventing photo-emission effects

4792. The enamel has no capacity of self repair because______________?
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A. It has no direct connection with the active cells of the dental pulp

B. Its formative cells are lost once it is completely formed

C. It is essentially a keratin tissue and has no blood vessels

D. It has only a small percent of organic content

4793. The emphasis on rural virtues__________________?
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A. gave urban dwellers an inferiority complex

B. is based on stereotypes

C. helped democratic representation in the states

D. has been reinforced by recent studies

4794. The emission of an a-particle causes the resultant nucleus to have____________________?
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A. More atomic weight and less atomic number

B. Less atomic weight and more atomic number

C. Less atomic weight and less atomic number

D. None of these

4795. The emission of an a-particle causes the resultant nucleus to have____________________?
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A. Less atomic weight and less atomic number

B. Less atomic weight and more atomic number

C. More atomic weight and less atomic number

D. None of these

4797. The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by_________________?
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A. Decreasing the surface area of the electrodes

B. Increasing the concentration of copper sulphate solution

C. Increasing the surface area of the electrodes

D. Increasing the concentration of zinc sulphate solution

4800. The Elitist theory holds that the power is always concentrated in the hands of: _________?
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A. Military class

B. Priestly class

C. Civil Servants

D. A small group of elites

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