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Materials & Engineering

24 questions in Science & Technology.

Asked in 2026, 2023, 2022, 2020, 2018, 2014, 2012, 2008, 2007, 2006, 2005, 2004, 2000, 1999, 1998, 1996, 1995

2026 · Q69Science & TechnologyMaterials & Engineeringmoderate

Which of the following statements with regard to Black Boxes used in modern aircrafts is/are correct ? 1. They carry a beacon emitting red light pulses to facilitate underwater detection. 2. They record both the cockpit voice and flight data. 3. Their memory units are made using either stainless steel or titanium. Select the answer using the code given below :

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 2 only
  4. (d)1, 2 and 3
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Official answer(b) 2 and 3 only

2022 · Q28Science & TechnologyMaterials & Engineeringmoderate

With reference to India, consider the following statements : 1. Monazite is a source of rare earths. 2. Monazite contains thorium. 3. Monazite occurs naturally in the entire Indian coastal sands in India. 4. In India, Government bodies only can process or export monazite. Which of the statements given above are correct ?

  1. (a)1, 2 and 3 only
  2. (b)1, 2 and 4 only
  3. (c)3 and 4 only
  4. (d)1, 2, 3 and 4
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Official answer(b) 1, 2 and 4 only

2022 · Q46Science & TechnologyMaterials & Engineeringmoderate

With reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements : 1. Its fibres can be blended with wool and cotton fibres to reinforce their properties. 2. Containers made of it can be used to store any alcoholic beverage. 3. Bottles made of it can be recycled into other products. 4. Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions. Which of the statements given above are correct ?

  1. (a)1 and 3
  2. (b)2 and 4
  3. (c)1 and 4
  4. (d)2 and 3
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Official answer(a) 1 and 3

2020 · Q41Science & TechnologyMaterials & Engineeringdifficult

With reference to carbon nanotubes, consider the following statements : 1. They can be used as carriers of drugs and antigens in the human body. 2. They can be made into artificial blood capillaries for an injured part of human body. 3. They can be used in biochemical sensors. 4. Carbon nanotubes are biodegradable. Which of the statements given above are correct ?

  1. (a)1 and 2 only
  2. (b)2, 3 and 4 only
  3. (c)1, 3 and 4 only
  4. (d)1, 2, 3 and 4
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Official answer(c) 1, 3 and 4 only

2014 · Q98Science & TechnologyMaterials & Engineeringmoderate

There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why? 1. They can accumulate in the environment, and contaminate water and soil. 2. They can enter the food chains. 3. They can trigger the production of free radicals. Select the correct answer using the code given below.

  1. (a)1 and 2 only
  2. (b)3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(d) 1, 2 and 3

2012 · Q14Science & TechnologyMaterials & Engineeringmoderate

Graphene is frequently in news recently. What is its importance? 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct?

  1. (a)1 and 2 only
  2. (b)3 and 4 only
  3. (c)1, 2 and 4 only
  4. (d)1, 2, 3 and 4
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Official answer(c) 1, 2 and 4 only

2012 · Q86Science & TechnologyMaterials & Engineeringmoderate

Recently, there has been a concern over the short supply of a group of elements called 'rare earth metals'. Why? 1. China, which is the largest producer of these elements, has imposed some restrictions on their export. 2. Other than China, Australia, Canada and Chile, these elements are not found in any country. 3. Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(c) 1 and 3 only

1998 · Q106Science & TechnologyMaterials & Engineeringmoderate

Consider the following statements: Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to I. Act as a reducing agent. II. Remove silica associated with the iron ore. III. Function as fuel, to supply heat. IV. Act as an oxidizing agent. Of these statements:

  1. (a)I and II are correct
  2. (b)II and IV are correct
  3. (c)I and III are correct
  4. (d)III and IV are correct
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Official answer(c) I and III are correct