General Knowledge (Part – B : english) (NDA/NA SOLVED PAPER 2021-I) (51 to 100)

Total Questions: 50

11. Which one of the following statements about dihydrogen (H₂) is not correct?

Correct Answer: (d) A mixture of NO₂ and H₂ is known as Syngas.
Solution:Syngas, or synthesis gas, is a fuel gas mixture consisting primarily of hydrogen, carbon monoxide, and very often some carbon dioxide. The name comes from its use as intermediates in creating synthetic natural gas (SNG) and for producing ammonia or methanol.

12. Which of the following sets of elements has the same valency?

Correct Answer: (d) Mg, Ca, Ba
Solution:
  • Valency of Na is 1
  • Valency of K is 1
  • Valncy of Mg is 2
  • Valency of Ca is 2
  • Valency of Ba is 2
  • Valency of Al is 3

13. Which one of the following is the lowest possible temperature?

Correct Answer: (d) -273° Celsius
Solution:-273 degree celsius is the lowest among the following given temperatures. Highest the number in the negative scale, lower the temperature.

14. Numerically two thermometers, one in Fahrenheit scale and another in Celsius scale shall read same at

Correct Answer: (a) -40°
Solution:
  • Celsius and Fahrenheit are two important temperature scales. The Fahrenheit scale is used primarily in the United States, while Celsius is used throughout the world. The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit.
  • However, there is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40°C and -40°F.

15. The image we see in plane mirror is

Correct Answer: (c) virtual and is laterally inverted.
Solution:The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.
An image formed by a plane mirror has the following characteristics:
  • Virtual and erect.
  • Behind the mirror.
  • The size of the image is equal to the size of the object.
  • Laterally inverted image (image of the left side visible on the right side).

16. Which one of the following colours may be obtained by combining green and red colours?

Correct Answer: (d) Yellow
Solution:By convention, the three primary colors in additive mixing are red, green, and blue. In the absence of light of any color, the result is black. If all three primary colors of light are mixed in equal proportions, the result is neutral (gray or white). When the red and green lights mix, the result is yellow.

17. Which of the following are the primary colours of light?

Correct Answer: (b) Blue, Red and Green
Solution:the three primary colors of light: red, green and blue.

18. According to the New Cartesian Sign Convention, which one of the following is correct in respect of the formula 1/f = 1/v + 1/u, where symbols have their usual meanings?

Correct Answer: (a) It applies only to spherical mirrors.
Solution:The formula is a relation between the object distance u, image distance v and the focal length from the pole of the mirror. The formula is valid for the images in spherical mirror. In lenses, there comes minus in place of addition.

19. Movement of materials to different parts of cytoplasm and nucleus is generally carried out by

Correct Answer: (d) Endoplasmic reticulum.
Solution:Transfer of materials to different parts of cytoplasm and nucleus is done by Endoplasmic Reticulum. Endoplasmic reticulum.
  • The extensive network can be naturally found in the cell. The nuclear envelope is bound to the endoplasmic reticulum.
  • It is a membranous network that typically surrounds a fluid-filled lumen that almost completely fills the intracellular cavity.
  • As a direct result, it acts as a protein transport channel between the active nucleus and the cytoplasm.
  • The ER allows materials to be transported from one part of the cell to another, arranging the circulatory system of the cell

20. In mitochondria, ATP synthesizing chemical reactions take place in the

Correct Answer: (c) Inner membrane.
Solution:ATP synthesis occurs in the inner mitochondrial membrane in mitochondria. The enzyme required for the synthesis of ATP is ATP synthase. It is located in the dinner mitochondrial membrane.
There is transfer of protons from the matrix to the inner mitochondrial membrane. This creates a concentration gradient of protons. ATP synthase uses this concentration gradient to synthesize the energy rich molecule ATP.