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CBSE Class 10 Pre Board 2021 : Science - Set 2 (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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PRE-BOARD EXAMINATION 2020-21 SUBJECT SCIENCE - STANDARD Class: X (CBSE) Total Marks: 80 Date: . Time: 3 hours _______________________________________________________________ General Instructions: All Questions are compulsory. Marks are indicated against each question. Please check this question paper contains 13 printed pages only. SECTION A 1. Balance the following chemical reaction: MnO2 + HCl -------- MnCl2 + Cl2 + H2O OR What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube? 1 2. Write the chemical equation for the reaction involved when sodium hydrogen carbonate is heated. 1 3. The solution of one of the following compounds will not conduct electricity. This compound is: a)NaCl b) CCl4 c) MgCl2 d) CaCl2 1 4. What is the nature of image formed by a concave mirror if the magnification produced by the mirror is +3? 1 5. Why does sky look blue on a clear day? 1 6. When is the force experienced by a current carrying conductor placed in a magnetic field is the largest? 1 7. State the rule which gives direction of magnetic field associated with a current carrying conductor. 1 8. Two unequal resistances are connected in parallel. If you are not provided with any other parameters (eg: numerical values of I and R), what can be said about the voltage drop across the two resistors? 1 OR Page 1 of 13

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