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Science: 01. When an object undergoes acceleration (1) Its speed always increases. (2) It always falls towards the earth. (3) Its velocity always increases. (4) None of these
02. External forces are : (1) Always balanced. (2) Never balanced. (3) May or may not be balanced. (4) None of these.
03. How many dynes are equal to 1 N ? (1) 106 (2) 104 (3) 105 (4) 103
04. Sharper knives cut fruits easily because : (1) The area of contact is more (2) The area of contact is less. (3) It shines more (4) None of these.
05. A force of 50 N is applied normally on a table top of area 2 m2 . Then the pressure exerted on the table top is– (1) 25 Nm–2 (2) 50 Nm–2 (3)10Nm–2 (4) 100 Nm2
06. A force that opposes the motion of one surface sliding over another is called : (1) Lubrication. (2) Ball bearing. (3) Friction. (4) Polishing.
07. The fibre made up by the chemical treatment of wood pulp is (1) Rayon (2) Nylon (3) Polyester (4) None of these.
08. A synthetic fibre which works like wool. (1) Nylon (2) Polyester (3) Acrylic (4) PVC
09. The raw materials used in making nylon (1) Wood pulp (2) Cellulose (3) Coal, water, air (4) All of these
10. All metals are solids except (1) Sodium (2) Calcium (3) Mercury (4) Gold
11. Metal oxides are of nature (1) Acidic (2) Basic (3) Neutral (4) All of these
12. The metal which can be cut easily with a knife (1) Sodium and potassium (2) Barium and calcium (3) Sodium and mercury (4) Potassium and calcium.
13. The process of loosening and turning the soil is known as: (1) Winnowing (2) Ploughing (3) Harvesting (4) Threshing
14. Which type of irrigation is similar to rainfall? (1) Moat (2) Sprinkler system (3) Rahat (4) Drip system
15. Which of the following is a rabi crop? (1) Rice (2) Mustard (3) Soyabean (4) Maize
16. Organic wastes can be decomposed to form ………., which can sustainably enhance the nutrient content of the soil. (1) compost (2) cow dung (3) fertiliser (4) pesticide
17. The chemical substances rich in nutrients are called (1) fertiliser (2) weedicide (3) pesticides (4) herbicides
18. The functional unit of life is called (1) Cell (2) Egg (3) Nucleus (4) None of these
19. Chloroplast is found in (1) Plant cell only (2) Animal cell only (3) Both of these (4) None of these
20. The control unit of cell is (1) Nucleus (2) Cell wall (3) Cytoplasm (4) All of these.
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