General Knowledge (Part – B : English) Antonyms (NDA/NA SOLVED PAPER 2022-II) (51 to 100)

Total Questions: 50

21. To help deep-sea divers breathe, they carry cylinders of oxygen mixed with

Correct Answer: (b) helium
Solution:Deep-Sea Divers breathe a Mixture of Helium and Oxygen. Helium is added to reduce the proportions of nitrogen and oxygen below those of air, to allow the gas mixture to be breathed safely on deep dives. A lower proportion of nitrogen is required to reduce nitrogen narcosis and other physiological effects of the gas at depth.

22. Which of the following compounds undergoes/undergo thermal decom-position?

Correct Answer: (c) Silver oxide
Solution:Solid silver oxide decomposes at temperatures greater than 280 °C, yielding metallic silver and oxygen gas.

23. The transfer of electrical signals by nerve cells in human body is enabled by

Correct Answer: (d) sodium and potassium
Solution:Nerve cells generate electrical signals that transmit information. These electrical signals are action potentials, which transmit the information from one neuron to the other. An action potential is a rapid, temporary change in membrane potential and caused by sodium (Na) rushing to a neuron and potassium (K) rushing out.

24. Silver artefacts get tarnished in air due to the formation of

Correct Answer: (c) silver sulphide
Solution:Silver articles turn black when exposed to the atmosphere for a few days due to the formation of silver sulphide. It is due to sulphur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of sulphide of silver.

25. Human eye can see objects at different distances with contrasting illuminations. This is due to

Correct Answer: (d) accommodation of eye
Solution:Accommodation is the adjustment of the optics of the eye to keep an object in focus on the retina as its distance from the eye varies. This ability is mediated through the ciliary muscles of the eye and helps in change of the focal length of the lens by changing the curvature of lens.

26. Which one of the following hormones increases the heartbeat in mammals?

Correct Answer: (d) Adrenaline
Solution:Adrenaline caused an increase in systolic blood pressure, a decrease in diastolic blood pressure, and an increase in heart rate. Adrenaline is a hormone also known as epinephrine and secreted by the medulla of the adrenal glands and functions primarily to increase cardiac output.

27. The digestion of fat in human intestine is performed by

Correct Answer: (b) bile and lipase
Solution:Lipids are digested mainly in the small intestine by bile salts through the process of emulsification. This process helps in breaking lipids into fatty acids and mono-glycerides in the presence of lipases.

28. Which one of the following statements about animal cells and plant cells is correct?

Correct Answer: (b) Animal cells have only cell membrane not cell wall, but plant cells have both.
Solution:Animal cells have a cell membrane, but no cell well. On the other hand Plant cells have cell wall as well as a cell membrane. The cell wall surrounds the cell membrane and provides the plant cell its unique rectangular shape.

29. Lymph is a tissue fluid present in intercellular spaces. It resembles to

Correct Answer: (d) plasma
Solution:Lymph is a fluid similar in composition to blood plasma. It is derived from blood plasma as fluids pass through capillary walls at the arterial end. Lymph is a clear to white fluid tissue which is composed of lymphocytes and white blood cells. Lymph is the part of the lymphatic system and is generally found in the lymphatic vessels and in the various cavities of the body.

30. The breakdown of glucose in cytoplasm results in the formation of

Correct Answer: (a) pyruvate and energy
Solution:The breakdown of glucose (a 6-carbon compound) in cytoplasm results in the formation of two molecules of a 3-carbon compound called pyruvate through the process of Glycolysis. Pyruvate breaks further in mitochondria, forming carbon dioxide and subsequent energy is released.