GKToday's Full Length UPSC CSE (Prelims) Test Series - 2019
UPSC Prelims Test Series 2019 – Mock Test-18
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61. On heating a pure silicon circular disc with a circular hole at the centre, the diameter of the hole:
62. The speed of an artificial satellite depends upon:
- Mass of the satellite
- Radius of orbit for the satellite
- Mass of the central body about which the satellite orbits
- Gravitational constant
Select the correct option from codes given below:
63. With reference to the birth and death of stars, consider the following general observations:
- The fate of a star after its nuclear fuel burns out, depends on the mass it was born with
- When the star exhausts its nuclear fuel, gravity causes it to collapse & shrink
- White dwarfs are one of the densest forms of matter in the universe, next only to black holes
Which among the above observations is / are correct?
64. The pointer or arrow of the magnetized needle of a compass indicates which among the following?
65. The "black box" is vital equipment in understanding the causes of aviation accidents. Which of the following statements is/are correct about the "black box"?
- The "black box" is painted black so that it is easily recoverable after accident
- It functions both as voice recorder as well as flight data recorder
Select the correct option from codes given below:
66. Snow looks white, but water looks generally colourless. What could be the possible explanation to this?
67. The major difference between cartilage and bone is that:
68. The roots of which of the following plants are home to a variety of Nitrogen fixation bacteria?
- Pea
- Sugarcane
- Sugarbeet
Select the correct option from the codes given below:
69. Enhancing the ‘Seed Replacement Rates’ of various crops helps in achieving optimal production. However, India’s seed replacement ratio is dismal in case of most crops. What is / are the reasons for the same?
- There is no National Seeds Policy in India
- Demand supply gap in case of low value, high volume crops
- Private companies are not allowed to sell seeds of crops related to food security
Select the correct option from the codes given below:
70. Which of the following denotes "Market Capitalization"?