Class 10 Science HW PDF

HOLIDAY HOME WORK CLASS :X SUBJECT : GENERAL SCIENCE WORKSHEET-I SECTION – A 1. Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of...

HOLIDAY HOME WORK CLASS :X SUBJECT : GENERAL SCIENCE WORKSHEET-I SECTION – A 1. Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would she observe? A. The solution turned red. B. Yellow precipitate was formed. C. White precipitate was formed. D. The reaction mixture became hot. 2. Identify gas A in the following experiment. A. Nitrogen B. Hydrogen C. Oxygen D. Carbon dioxide 1 3. Which of the following two combinations are correct? Metal Gas Evolved (i) Copper Yes (ii) Iron Yes (iii) Magnesium No (iv) Zinc Yes A. i and iii B. i and iv C. ii and iii D. ii and iv 4. Which of the following correctly represents a balanced chemical equation? A. Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g) B. 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g) C. 3Fe(s) + H2O(g) → Fe3O4 (s) + H2(g) D. 3Fe(s) + 4H2O(g) → Fe3O4 (s) + H2(g) 5. The graph given below depicts a neutralization reaction (acid + alkali → salt + water). The pH of a solution changes as we add excess of acid to an alkali. Which letter denotes the area of the graph where both acid and salt are present? A. A B. B C. C D. D 2 6. In the reaction of iron with copper sulphate solution: CuSO4 + Fe ---> Cu + FeSO4 Which option in the given table correctly represents the substance oxidised and the reducing agent? OPTION Substance Oxidized Reducing Agent A Fe Fe B Fe FeSO4 C Cu Fe D CuSO4 Fe 7. The chemical reaction between copper and oxygen can be categorized as: A. Displacement reaction B. Decomposition reaction C. Combination reaction D. Double displacement reaction 8. Which of the given options correctly represents theParent acid and base of Calcium Carbonate? OPTION PARENT ACID PARENT BASE A HCl NaOH B H2CO3 Ca(OH) 2 C H3PO3 CaSO4 D H2SO4 CaSO4 9. How will you protect yourself from the heat generated while diluting a concentrated acid? A. By adding acid to water with constant stirring. B. By adding water to acid with constant stirring. C. By adding water to acid followed by base. D. By adding base to acid with constant stirring. 10. Why is it important to balance a skeletal chemical equation? A. To verify law of conservation of energy. B. To verify the law of constant proportion. C. To verify the law of conservation of mass. D. To verify the l0aw of conservation of momentum. 3 11. Carefully study the diagram of the human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and /or characteristic. A. (i) Trachea: It is supported by bony rings for conducting inspired air. B. (ii) Ribs: When we breathe out, ribs are lifted. C. (iii) Alveoli: Thin-walled sac like structures for exchange of gases. D. (iv) Diaphragm: It is pulled up when we breathe in. 12. Identify the option that indicates the correct enzyme that is secreted in location A, B and C. A. (i)-lipase, (ii)-trypsin, (iii)-pepsin B. (i)-amylase, (ii)-pepsin, (iii)-trypsin C. (i)-trypsin, (ii)-amylase, (iii)-carboxylase D. (i)-permease, (ii)-carboxylase, (iii)-oxidase 4 13. Opening and closing of stomatal pore depends on: A. Atmospheric temperature B. oxygen concentration around stomata C. carbon dioxide concentration around stomata D. water content in the guard cells 14. The figure given below shows a schematic plan of blood circulation in humans with labels (i) to (iv). Identify the correct label with its functions? A. (i) Pulmonary vein - takes impure blood from body part. B. (ii) Pulmonary artery - takes blood from lung to heart. C. (iii) Aorta - takes blood from heart to body parts. D. (iv) Vena cava takes - blood from body parts to right auricle. 15. Identify the phase of circulation which is represented in the diagram of heart given below. Arrows indicate contraction of the chambers shown. A. Blood transferred to the right ventricle and left ventricle simultaneously. B. Blood is transferred to lungs for oxygenation and is pumped into various organs simultaneously. C. Blood transferred to the right auricle and left auricle simultaneously. D. Blood is received from lungs after oxygenation and is received from various organs of the body. 5 16. Observe the diagram of Human digestive system. Match the labeling referred in column I and correlate with the function in column II. A. i.- a) ; ii – b) ; iii – c) ; iv- d) B. i.- b) ; ii – c) ; iii – d) ; iv- a) C. i.- b) ; ii – d) ; iii – c) ; iv- a) D. i.- d) ; ii – a) ; iii – b) ; iv- c) 17. Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth? A. Convex mirror B. Plane mirror C. Concave mirror D. Any spherical mirror 6 18. Which diagram shows image formation of an object on a screen by a converging lens? A. B. C. D. 19 Which of the following can make a parallel beam of light when light from a point source is incident on it? A. Concave mirror as well as convex lens. B. Convex mirror as well as concave lens. C. Two plane mirrors placed at 90° to each others. D. Concave mirror as well as concave lens. 20. Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order. A. The speed of light in water > the speed of light in air > the speed of light in glass. B. The speed of light in glass > the speed of light in water > the speed of light in air. C. The speed of light in air > the speed of light in water > the speed of light in glass. D. The speed of light in glass > the speed of light in air > the speed of light in water. 21. If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct? A. r =v B. r >v C. r = 1/v D. r