General Knowledge : General Science QUESTIONS AND ANSWERS :: part10 : 21 to 25
Following General Knowledge Multiple choice objective type questions and answers will help you in TRB, SSC and UPSC 2024 examinations :
21.Citrus fruit products should not be preserved in vessels of |
| copper |
| tin |
| steel |
| iron |
22.Which of the following provides the best estimate of the worlds biological diversity ? |
| Of about 10 million species probably alive today, some 20 species are lost everyday, most of them unknown because no more than half a million have yet been actually identified by scientists. |
| Of about 30 million living species, some 50 are lost everday, most of them unknown because no more than one million have been actually identified. |
| Of about 45 million living species, some 100 are lost everday, most of them unknown because no more than 1.5 million have been actually identified. |
| Of about 75 million living species, some 500 are lost everday, most of them unknown because no more than 3 million have been actually identified. |
23.Which of the following gases is not found free in air ? |
| Nitrogen |
| Hydrogen |
| Oxygen |
| Carbon dioxide |
24.Chromosomes are |
| present only in the nucleus of a cell |
| the biggest in number in human cells |
| made up of DNA as a main component |
| visible in all cells at every time |
25.If safe storage is to be ensured, the moisture content of food grains at the time of harvesting should not be higher than |
| 14% |
| 16% |
| 18% |
| 20% |
More General Science QUESTIONS AND ANSWERS available in next pages
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