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Science & Technology 2021

Science and Technology 2021

1. Water can dissolve more substances than any other liquid because [UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

2. With reference to street-lighting, how do sodium lamps differ from LED lamps?

  1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
  2. As street lights, sodium lamps have longer life span than LED lamps.
  3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting.

Select the correct answer using the code given below.
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

3. The term ‘ACE2’ is talked about in the context of
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

4. Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

5. ‘Triclosan’, considered harmful when exposed to high levels for a long time, is most likely present in which of the following?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

6. Which one of the following is a reason why astronomical distances are measured in light-years?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

7. With reference to recent developments regarding ‘Recombinant Vector Vaccines’, consider the following statements:

  1. Genetic engineering is applied in the development of these vaccines.
  2. Bacteria and viruses are used as vectors.

Which of the statements given above is/are correct?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

8. In the context of hereditary diseases, consider the following statements:

  1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of egg.
  2. A child inherits mitochondrial diseases entirely from mother and not from father.

Which of the statements given above is/are correct?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

9. Bollgard I and Bollgard II technologies are mentioned in the context of
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

10. In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

  1. Area of the hole in the lid
  2. Temperature of the flame
  3. Weight of the lid

Select the correct answer using the code given below.
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

11. Bacteria

  1. Fungi
  2. Virus

Which of the above can be cultured in artificial/synthetic medium?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

12. Consider the following statements:

  1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.
  2. Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus.

Which of the statements given above is/are correct?
[UPSC Civil Services Exam – 2021 Prelims]

 
 
 
 

13. Which one of the following is used in preparing a natural mosquito repellent?
[UPSC Civil Services Exam – 2021 Prelims]