Questions and answers for exam Preparation

MCQs

Total Questions : 26 | Page 1 of 3 pages

Question 1. Regarding one dimensional heat transfer, choose the correct statement

Steady- f (x), Unsteady- f (x, t)
Steady- f (x, t), Unsteady- f (x)
Steady- f (x, y, t), Unsteady- f (x)
Steady- f (y, z), Unsteady- f (y)

Discuss Question

Answer: Option D. -> Steady- f (y, z), Unsteady- f (y)
Answer: (d).Steady- f (y, z), Unsteady- f (y)

Question 2. Which of the following is an example of steady state heat transfer?

Boilers and turbines
Cooling of I.C engine
Chilling effect of cold wind on a warm body
Electric bulb cools down by the surrounding atmosphere

Discuss Question

Answer: Option D. -> Electric bulb cools down by the surrounding atmosphere
Answer: (d).Electric bulb cools down by the surrounding atmosphere

Question 3. Heat transfer takes place according to which law?

Newton’s law of cooling
Second law of thermodynamics
Newton’s second law of motion
First law of thermodynamics

Discuss Question

Answer: Option B. -> Second law of thermodynamics
Answer: (b).Second law of thermodynamics

Question 4. Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?

Axial only
Unpredictable
Radial only
No heat transfer takes place

Discuss Question

Answer: Option C. -> Radial only
Answer: (c).Radial only

Question 5. Which statement is true regarding steady state condition?

There is a variation in temperature in the course of time
Heat exchange is constant
It is a function of space and time coordinates
Internal energy of the system changes

Discuss Question

Answer: Option B. -> Heat exchange is constant
Answer: (b).Heat exchange is constant

Question 6. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are

much stronger in proteins than in water
not reformed with water
slightly weaker in proteins than in water
slightly stronger in proteins than in water

Discuss Question

Answer: Option D. -> slightly stronger in proteins than in water
Answer: (d).slightly stronger in proteins than in water

Question 7. If the Standard Gibb's free energy, ΔG°, for a reaction is positive then

the products will be favored
the reactants will be favored
the concentration of the reactants and products will be equal
all of the reactant will be converted to product

Discuss Question

Answer: Option B. -> the reactants will be favored
Answer: (b).the reactants will be favored

Question 8. If the enthalpy change for a reaction is zero, ΔG° is equal to

TΔS°
-TΔS°
-ΔH°
lnKeq

Discuss Question

Answer: Option B. -> -TΔS°
Answer: (b).-TΔS°

Question 9. Reactions that have positive standard free energy changes (ΔGo> 0) can be made to occur in cells by

coupling them with exergonic reactions via a common intermediate
manipulating the concentrations of products and reactants such that G/<0
coupling them to the hydrolysis of ATP
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 10. The Standard Gibb's free energy, ΔG°, is

the residual energy present in the reactants at equilibrium
the residual energy present in the products at equilibrium
the difference in the residual energy of reactants and products at equilibrium
the energy required to convert one mole of reactants to one mole of products

Discuss Question

Answer: Option D. -> the energy required to convert one mole of reactants to one mole of products
Answer: (d).the energy required to convert one mole of reactants to one mole of products