General Knowledge (NDA/NA SOLVED PAPER 2023-I) (Part – B) (101 to 150)

Total Questions: 50

1. Tableaux of which one of the following States was adjudged the best in the Republic Day Parade, 2023?

Correct Answer: (a) Uttarakhand
Solution:The tableau of Uttrakhand was given away the best tableau award among the 17 states/union territories tableaux displayed at the Republic Day 2023. It was based on the theme 'Manaskhand'.

2. Organisms capable of using CO₂ as principal carbon source are called:

Correct Answer: (a) Autotrophs
Solution:Autotrophs obtain carbon from inorganic sources like carbon dioxide (CO₂). These organisms use CO₂, as primary source of carbon and are capable of producing their own food using light, water, carbon dioxide, or other chemicals.

3. When yeast cells are O₂ starved, fermentation serves as the source of energy. This results in the production of:

Correct Answer: (a) ATP + CO₂ + Ethanol
Solution:During fermentation, yeast cells convert cereal-derived sugars into ethanol and CO₂. This anaerobic reaction can be written as, Carbohydrate-----Yeast------→Ethanol + CO₂ + ATP
At the same time, hundreds of secondary metabolites that influence the aroma and taste of beer are produced.

4. During a laboratory experiment, a student immerses epidermal leaf peel in a hypertonic solution. After some time, the student examined the cells under a microscope and observed that:

Correct Answer: (b) the cells were plasmolysed.
Solution:When plant cells are exposed to hyperosmotic stress they undergo Plasmolysis.
Plasmolysis is defined as the process of contraction or shrinkage of the protoplasm of a plant cell and is caused due to the loss of water in the cell.

5. Which one of the following is not a characteristic feature of fungi?

Correct Answer: (c) Can carry out photosynthesis
Solution:
  • Fungi are eukaryotic organisms means they have true nucleus which are enclosed in membranes.
  • Fungi are heterotrophic organisms. They obtains its food and energy from organic substances, plant and animal matters.
  • They are non-vascular organisms. They do not have vascular system. Xylem and Phloem are absent.
  • Fungi have cell walls (plants also have cell walls, but animals have no cell walls).
  • he structure of cell wall is similar to plants but chemically the fungi cell wall are composed of chitin
  • There is no embryonic stage for fungi.

6. Which one of the following statements about bryophytes is not correct?

Correct Answer: (d) Specialized water-conducting tissues are present.
Solution:Bryophytes do not have specialized water-conducting tissues; thus, option (d) is incorrect.

7. What is the specific purpose of using potassium hydroxide during the saponification process?

Correct Answer: (b) To obtain soaps which are soft on the skin
Solution:The process of converting fats, oil, and lipid into soap using an aqueous alkali is called saponification. Vegetable oil and animal fats are triesters or triglycerides that can be saponified in one or two steps.
During this process, the triglyceride reacts with an aqueous hydroxide ion to form a mixture of glycerol and fatty acid derivative. The sodium or potassium salts of long-chained fatty acids are a significant component of soap
The alkali used in this process is sodium hydroxide (NaOH) or lye for hard soap and potassium hydroxide (KOH) for soft soap.in

8. Which one of the following is the correct arrangement of metals in the decreasing order of their reactivity?

Correct Answer: (d) Sodium, Iron, Copper, Silver
Solution:The arrangement of metals as per decreasing order of their reactivity is-Sodium > Iron > Copper > Silver

9. Which among the following statements is not correct with respect to allotrop Qes of Carbon?

Correct Answer: (d) Next to diamond, graphite is the second hardest known substance.
Solution:Graphite is a good conductor of electricity because of the presence of free electrons in its. The hardness of minerals is compared using the Mohs Hardness Scale, a relative scale numbered 1 (softest) to 10 (hardest).
  • Graphite is very soft and has a hardness of 1 to 2 on this scale.
  • Diamonds are the hardest known natural substance and have a hardness of 10. No other naturally occurring substance has a hardness of 10.

10. Which among the following is the popular method for manufacture of ammonia?

Correct Answer: (b) Haber-Bosch process
Solution:Ammonia is used as raw material for the production of various nitrogen compounds, including nitric acid, and a variety of fertilisers and polymers. Also, ammonia is used as refrigerant and neutraliser for NOx emission from fuel combustion.
The Haber-Bosch process takes nitrogen gas from the atmosphere and combines it to form ammonia gas with molecular hydrogen gas.