Lakshya Education MCQs

Question: Pick up wrong statement about wrought iron
Options:
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
Answer: Option D
Explanation :

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Question 1. Pick up wrong statement about wrought iron
  1.     It contains carbon of the order of 0 to 0.25%
  2.     It melts at 1535°C
  3.     It is very soft and ductile
  4.     It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
Answer: Option D
Explanation :
Question 2. Which of the following statement is true about brittle fracture?
  1.     High temperature and low strain rates favour brittle fracture
  2.     Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
  3.     Brittle fracture is always preceded by noise
  4.     Cup and cone formation is characteristic for brittle materials
Answer: Option B
Explanation :
Question 3. Bronze contains
  1.     70% copper and 30% zinc
  2.     90% copper and 10% tin
  3.     85 - 92% copper and rest tin with little lead and nickel
  4.     70 - 75% copper and rest tin
Answer: Option B
Explanation :
Question 4. Maximum percentage of carbon in ferrite is
  1.     0.025%
  2.     0.06%
  3.     0.1%
  4.     0.25%
Answer: Option A
Explanation :
Question 5. Which of the following statement is true about brittle fracture?
  1.     High temperature and low strain rates favour brittle fracture
  2.     Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
  3.     Brittle fracture is always preceded by noise
  4.     Cup and cone formation is characteristic for brittle materials
Answer: Option B
Explanation :
Question 6. Brass contains
  1.     70% copper and 30% zinc
  2.     90% copper and 10% tin
  3.     85 - 92% copper and rest tin with little lead and nickel
  4.     70 - 75% copper and rest tin
Answer: Option A
Explanation :

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