Roman Saini is teaching live on Unacademy Plus
Q106. The process of making fabrics from yarn is known as; a. Weaving b. Spinning c. Harvesting d. Fabrication Harvesting
Answer: a Explanation: There are two methods for making fabric from yarn; Weaving and knitting.
0107. Threshing is the process of; a. Separating grains from stalk. b. Separating grains from impurities c. Cutting down the standing crop d. Planting saplings in the agricultural fields
Answer: a Explanation: The process that is used to separate grain from stalks etc. is threshing. In this process, the stalks are beaten to free the grain seeds. It can be done manually, with the help of bullocks or with machines.
Q108. Consider the following statements regarding winnowing: 1. Winnowing is the process of separating heavier and lighter elements in a mixture. 2. Winnowing works on the principle of magnetic separation. Choose the correct statement/statements. 1 only b. 2 only c. Both 1 and 2 d. None of the above
Answer: a Explanation: Winnowing is used to separate heavier and lighter components of a mixture by wind or by blowing air. It does not depend on magnetic separation. This method is commonly used by farmers to separate lighter husk particles from heavier seeds of grain.
0109. Sieving is used to separate different particles in a mixture when; a. The particles have different weights. b. The particles have different sizes. c. The particles have different solubility. d. The particles have different electric charge.
Answer: b Explanation: Sieving is used when components of a mixture have different sizes.
Q110. Consider the following statements: 1. Sedimentation is the process of settling down of heavy 2. Decantation is the removal of the upper layer of the liquid Choose the correct statement/ statements. solids in a mixture of a liquid and an insoluble solid without disturbing the settled solids. a. 1only 2 only c. Both 1 and 2 d. None of the above
Answer: c Explanation: The same principle is also used for separating a mixture of two liquids that do not mix with each other. For example, oil and water from their mixture can be separated by this process. If a mixture of such liquids is allowed to stand for some time, they form two separate layers. The component that forms the top layer can then be separated by decantation. Filtration is the process by which very fine insoluble solids can be separated from a liquid-solid mixture by passing it through a suitable porous material.
Q111. Consider the following statements: 1. The process of conversion of water into its vapour is called evaporation. 2. The process of evaporation takes place at 100 C. Choose the correct statement/ statements. a. b. 2 only c. Both 1 and 2 d. None of the above 1 only
Answer: a Explanation: Evaporation of water occurs when the surface of the liquid is exposed; allowing molecules to escape and form water vapour. It can occur at any temperature but its rate increases with increase in temperature.
Answer: b Explanation: Water drops are formed on the outside surface of a cold surface like a glass of cold water due to condensation of atmospheric water vapours on the cold surface of the glass.
0114. Salt is obtained from sea water by the process of a. Evaporation b. Condensation C. Decantation d. Filtration
Answer: c Explanation: Self-explanatory
Q116. Which of the following s the coloured part of the flower? Q116. Which of the following is the coloured part of the flower? a. b. Petal C. Sepal C. Stamen d. Pistil
Answer: b Explanation: Sepals are the green coloured outermost part of a flower. Their main function is to protect the growing bud. colourful part next are colourful and attractive so that insects could be attracted for pollination.
Q118. Which of the following statements is correct about an adventitious root? a. These are roots growing from the tap root. b. These are roots growing from the lateral roots c. These are roots growing from any part other than the roots of the plant. These are roots growing upwards. d.
Q119. Which of the following is the main root? a. Tap root b. Fibrous root C. Adventitious root d. Central root
0120. Which part of carrots, radish, sweet potato, turnip and tapioca is eaten? Stem b. Branches c. Roots Seeds
Answer: c Explanation: Self-explanatory