Material Science Test Questions - Set 3

1)   At critical speed of rotation, ball mill rotates at

a. high speed
b. low speed
c. neither slow nor very high speed
d. none of the above
Answer  Explanation  Related Ques

ANSWER: neither slow nor very high speed

Explanation:
No explanation is available for this question!


2)   Which of the following statements is/are true?

a. Reduction method produces iron powders which are perfectly spherical
b. Drawback of high oxide formation in shotting processes can be reduced with use of inert gases
c. At certain temperature and pressure carbonyl of metal decomposes to give water and metal
d. All of the above
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ANSWER: Drawback of high oxide formation in shotting processes can be reduced with use of inert gases

Explanation:
No explanation is available for this question!


3)   What is meant by atomization?

a. Process of disintegrating molten metal into small particles by use of compressed air
b. Process of fusing small particles of metals into molten mass by water
c. None of the above

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ANSWER: Process of disintegrating molten metal into small particles by use of compressed air

Explanation:
No explanation is available for this question!


4)   In physico - chemical processes, which factors affect reduction method?

a. Size of particles
b. Shape of materials
c. Reducing agent
d. All of the above
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ANSWER: All of the above

Explanation:
No explanation is available for this question!


5)   Different conditions favoring electro deposition are

a. low current density
b. high temperature
c. high viscosity
d. All of these
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ANSWER: high viscosity

Explanation:
No explanation is available for this question!


6)   Which of the following statements is/are false?

a. Temperature lower than 157 oC is cryogenic temperature
b. Impact test measures notch toughness
c. Nickel base steels are used for low temperature applications
d. All the above statements are false
Answer  Explanation  Related Ques

ANSWER: Temperature lower than 157 oC is cryogenic temperature

Explanation:
No explanation is available for this question!


7)   Biosensors are used in

a. medical field
b. agricultural field
c. pollution monitoring
d. all of the above
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ANSWER: all of the above

Explanation:
No explanation is available for this question!


8)   What is meant by Nil Ductility Transition Temperature (NDT)?

a. Metal gets transformed from brittle to ductile phase
b. Metal gets transformed from ductile to brittle phase
c. Metal gets transformed from malleable to ductile phase
d. Metal gets transformed from elastic to ductile phase
Answer  Explanation  Related Ques

ANSWER: Metal gets transformed from ductile to brittle phase

Explanation:
No explanation is available for this question!


9)   What is the effect of high temperatures on material properties?

a. loss of cohesive strength
b. increase in stiffness
c. increase in hardness
d. All of the above
Answer  Explanation  Related Ques

ANSWER: loss of cohesive strength

Explanation:
No explanation is available for this question!


10)   What causes transformation of deformed martensite into austenite phase?

a. Heating
b. Cooling
c. both a. and b.
d. all of the above
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ANSWER: Heating

Explanation:
No explanation is available for this question!


11)   What is meant by low angle boundary?

a. Low angle boundary represents a boundary between crystalline region and its surroundings
b. Low angle boundary is a surface defect which has angular misorientation between the grains
c. Both a. and b.
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Low angle boundary is a surface defect which has angular misorientation between the grains

Explanation:
No explanation is available for this question!


12)   Which process is used to remove internal stresses from a metal?

a. Annealing
b. Cold working
c. Both a. and b.
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Annealing

Explanation:
No explanation is available for this question!


13)   Select the correct option which shows mechanical property of ceramic materials?  

a. Non-crystalline ceramics become brittle below recrystallization temperature
b. At high temperatures ceramics have favorable properties
c. Ceramic products are resistant to oxidation
d. Ceramics can be used as a moderator
Answer  Explanation  Related Ques

ANSWER: Non-crystalline ceramics become brittle below recrystallization temperature

Explanation:
No explanation is available for this question!


14)   Ceramics having nuclear applications can be used as

a. moderators
b. controls
c. Both a. and b.
d. None of the above
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ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!


15)   Match the following group 1 items with group 2 items and select the correct option

1. Durometers ---------------------------------------------- A. Value of modulus of rigidity
2. Brinell Hardness test ---------------------------------- B. To verify formability   
3. Torsion test----------------------------------------------- C. Hardness of non-metallic materials like plastics       
4. Erichsen cupping test ---------------------------------- D. Hardness of soft and ductile materials


a. 1 – D, 2 – B, 3 – A, 4 – C
b. 1 – C, 2 – D, 3 – A, 4 – B
c. 1 – B, 2 – A, 3 – D, 4 – C
d. 1 – D, 2 – A, 3 – B, 4 – C
Answer  Explanation  Related Ques

ANSWER: 1 – C, 2 – D, 3 – A, 4 – B

Explanation:
No explanation is available for this question!


16)   What is the effect of L/D ratio on compressive strength?

a. compressive strength increases and then remains constant as L/D ratio increases
b. compressive strength decreases and then increases as L/D ratio increases
c. compressive strength decreases and then remains constant as L/D ratio increases
d. none of the above
Answer  Explanation  Related Ques

ANSWER: compressive strength decreases and then remains constant as L/D ratio increases

Explanation:
No explanation is available for this question!


17)   Which of the following statements is/are false?

1. Ball indenter in Rockwell hardness test is made of diamond
2. Brale indenter in Rockwell hardness test is made of diamond
3. Micro hardness test is used to measure hardness of thin brittle materials


a. Only 1
b. Only 2
c. Only 3
d. All the statements are false
Answer  Explanation  Related Ques

ANSWER: Only 1

Explanation:
No explanation is available for this question!


18)   What does primary creep in creep curve indicate?

a. Due to down deformation, resistance of metal increases
b. Due to down deformation, resistance of metal decreases
c. It represents high strain rate
d. It represents creep at constant rate
Answer  Explanation  Related Ques

ANSWER: Due to down deformation, resistance of metal increases

Explanation:
No explanation is available for this question!


19)   What are the metal requirements to have creep resistance property?

a. Low melting point
b. High oxidation resistance
c. Both a. and b.
d. None of the above
Answer  Explanation  Related Ques

ANSWER: High oxidation resistance

Explanation:
No explanation is available for this question!


20)   Which type of microscope is used to determine particle diameter between (10 to 0.001 μ)?

a. Optical microscope
b. Electron microscope
c. Both a. and b.
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Electron microscope

Explanation:
No explanation is available for this question!


21)   What is meant by specific surface?

a. surface area per unit volume
b. surface area per unit weight
c. surface weight per unit area
d. none of the above
Answer  Explanation  Related Ques

ANSWER: surface area per unit weight

Explanation:
No explanation is available for this question!