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Hassan
1. The uncertainty in measurement may occur due to?
A. Limitation of an instrument
B. Natural variation of the object to be measured
C. Inadequate of technique
D. Limitation of an instrument
2.Random error can be reduced by?
A. Taking zero correction
B. Comparing the instrument with another more accurate one
C. Taking mean of several measurements
D. Taking zero correction
3.In any measurement the significant figures are?
A. All accurately known and all doubtful digits
B. Only accurately known digits
C. Only doubtful digits
D. All accurately known and all doubtful digits
4.A digit zero in a measurement?
A. May be significant may not significant
B. Always significant
C. Always insignificant
D. May be significant may not significant
5.The number of significant figures in 0.0173 are?
A. Three
B. Four
C. Five
D. Three
6.Smaller the least count of the instrument more is the measurement?
A. Accurate
B. Precise
C. Accurate and Precise
D. Accurate
7.Which system of the units is a coherent system of units in mechanics?
A. CGS
B. MKS
C. FPS
D. CGS
8. ML-1T-2 is the dimension of?
A. Force
B. Pressure
C. Momentum
D. Force
9. Dimensional analysis is helpful for?
A. Deriving a possible formula
B. Checking the homogeneity of a physical equation
C. Verification of laws
D. Deriving a possible formula
10. Which equation is not dimensionally correct?
A. E=mc2
B. Vf=Vi+at
C. S=Vt2
D. E=mc2
11.SI unit of coefficient of viscosity is?
A. kg.m.s-1
B. kg.m-1.s-1
C. kg.m.s
D. kg.m.s-1
12. Three students measured length of needle with meter rod and recorded as: (i) 0.2145m (ii) 0.21m (iii) 0.214m. Which one is a correct record?
A. Only (i)
B. Only (ii)
C. Only (iii)
D. Only (i)
13.One light-year is equal to?
A. 9.5×1015m
B. 9.5×1015sec
C. 9.5×1015km
D. 9.5×1015m
14. Absolute uncertainty in a measurement depends upon?
A. The magnitude of the measurement
B. Least count of the instrument
C. The percentage error in the measurement
D. The magnitude of the measurement
15.Desulphurisation of petrol is done in a _____________________?
A. Packed extraction column
B. Rotating disc extractor
C. Bollman extractor
D. Packed extraction column
16.Henry’s law states that the ________________________?
A. Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
B. Vapour pressure is equal to the product of the mole fraction and total pressure
C. Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
D. Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
17.Swenson-Walker crystalliser is a __________________ unit ?
A. Continuous
B. Semi-batch
C. Batch
D. Continuous
18.The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the_______
A. . Differential heat of adsorption
B. Integral heat of adsorption
C. Heat of wetting
D. . Differential heat of adsorption
19.Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the ___________________ moisture ?
A. Unbound
B. Free
C. Critical
D. Unbound
20.For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be __________________
A. 1
B. 2
C. 0
D. 1
21.With increase in temperature, the leaching rate increases because of the _____________________?
A. Decreased viscosity of liquid
B. Increased diffusivity
C. Both (a) and (b)
D. Decreased viscosity of liquid
22.Calculation of mass transfer co-efficient is mostly/normally done using ______________ theory?
A. Penetration
B. Film
C. Surface renewal
D. Penetration
23.Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to
A. Only liquid phase obeys Dalton’s law
B. Only vapor phase follows Raoult’s law
C. Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law
D. Only liquid phase obeys Dalton’s law
24.Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ?
A. Plate towers
B. Packed towers
C. Spray towers
D. Plate towers
25.Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?
A. K ∝D1.5
B. K ∝√D
C. K ∝D
D. K ∝D1.5
26.For water-ethanol system, the minimum reflux ratio_____________________?
A. Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
B. Is computed from the intercept of the operating line
C. Is the optimum reflux ratio
D. Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
27.At 750°K and 1 atm, the approximate value of Schmidt number for air is_________________?
A. 1
B. 0.1
C. 0.01
D. 1
28.Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of th
A. Availability
B. Cost
C. Toxicity
D. Availability
29.What is the degree of freedom of an absorption process in which only one component is transferred between phases ?
A. 2
B. 1
C. 3
D. 2
30.Rayleigh equation applies to _________________ distillation ?
A. Differential
B. Equilibrium
C. Flash
D. Differential
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