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5 questions

2025 · Question 43 · Materials Science
In the context of electric vehicle batteries, consider the following elements : I. Cobalt II. Graphite III. Lithium IV. Nickel How many of the above usually make up battery cathodes?
Choose your answer(a)Only one(b)Only two(c)Only three(d)All the four
Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)
2025 · Question 81 · Materials Science
Consider the following statements : Statement I : Some rare earth elements are used in the manufacture of flat television screens and computer monitors. Statement II : Some rare earth elements have phosphorescent properties. Which one of the following is correct in respect of the above statements?
Choose your answer(a)Both Statement I and Statement II are correct and Statement II explains Statement I(b)Both Statement I and Statement II are correct but Statement II does not explain Statement I(c)Statement I is correct but Statement II is not correct(d)Statement I is not correct but Statement II is correct
Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)
2024 · Question 36 · Materials Science
In which of the following are hydrogels used ? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below :
Choose your answer(a)1 only(b)1 and 2 only(c)2 and 3 only(d)1, 2 and 3
Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)
2023 · Question 53 · Materials Science
Consider the following statements : 1. Carbon fibres are used in the manufacture of components used in automobiles and aircrafts. 2. Carbon fibres once used cannot be recycled. Which of the statements given above is/are correct?
Choose your answer(a)1 only(b)2 only(c)Both 1 and 2(d)Neither 1 nor 2
Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)
2022 · Question 46 · Materials Science
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 ?
Choose your answer(a)1 and 3(b)2 and 4(c)1 and 4(d)2 and 3
Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)

In the context of electric vehicle batteries, consider the following elements : I. Cobalt II. Graphite III. Lithium IV. Nickel How many of the above usually make up battery cathodes?

Consider the following statements : Statement I : Some rare earth elements are used in the manufacture of flat television screens and computer monitors. Statement II : Some rare earth elements have phosphorescent properties. Which one of the following is correct in respect of the above statements?

In which of the following are hydrogels used ? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below :

Consider the following statements : 1. Carbon fibres are used in the manufacture of components used in automobiles and aircrafts. 2. Carbon fibres once used cannot be recycled. Which of the statements given above is/are correct?