Science . 1.Food: Where Does It Come From? 2.Components of Food; 3.Fibre to Fabric; 4.Sorting Materials and Groups; 5.Separation of Substances; 6.Changes Around Us; 7.Getting to Know …

10. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following corr ectly represents the type of the r eaction involved? (i) …

92 EXEMPLAR PROBLEMS – SCIENCE 6. What is the maximum resistance which can be made using five resistors each of 1/5 Ω? (a) 1/5 Ω (b) 10 Ω (c) 5 Ω (d) 1 Ω 7. What is the minimum …

10 EXEMPLAR PROBLEMS – SCIENCE 5. Sodium carbonate is a basic salt because it is a salt of (a) strong acid and strong base (b) weak acid and weak base (c) strong acid and weak base …

120 EXEMPLAR PROBLEMS – SCIENCE 36. 2Mg + O 2 → 2MgO 3Mg + N 2 → Mg 3 N 2 (a) X is MgO; Y is Mg 3 N 2 (b) MgO + H 2 O → Mg(OH) 2 37. Zinc is above hydr ogen wher eas …

Fig. 10.5 14. The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure 10.5. Which one of them is …

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10. The strength of magnetic field inside a long current carrying straight solenoid is (a) more at the ends than at the centr e (b) minimum in the middle (c) same at all points (d) found to increase …

22 EXEMPLAR PROBLEMS – SCIENCE 22. An alloy is (a) an element (b) a compound (c) a homogeneous mixture (d) a heterogeneous mixture 23. An electrolytic cell consists of (i) …

10. The movement of shoot towards light is (a) geotropism (b) hydrotropism (c) chemotropism (d) phototropism 11. The main function of abscisic acid in plants is to (a) increase the length of …