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CBSE Class 10 Pre Board 2020 : Science - Prelim 2 (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL, JAMMU SESSION-2019-2020 PREBOARD-II (ASSIGNMENT) CLASS-X SUBJECT-SCIENCE MM-80 MARKS TIME-3HRS Q1. Why is decomposition reaction called opposite of combination reaction? Q2. How does the concentration of H3O+ ions get affected, when a solution of an acid is diluted? Q3. Read the paragraph and answer the following . A student during a practical exam connects various components as shown in the circuit diagram. His aim is to draw graph between current and voltage but he is unable to get readings. a) What according to you is wrong in the circuit? b) Draw the correct circuit diagram. c) Can we interchange k key and ammeter A in the circuit? d) What will be the reading in ammeter A? Q4. TOPIC: HOMEOSTASIS AND FEED BACK Homeostasis means keeping the internal chemical environment of the body constant. Hormones help to maintain homeostasis by their integrated action and feed back control. Feed back control is mostly negative and rarely positive. NEGATIVE FEED BACK CONTROL Blood glucose Homeostasis The flow chart of blood glucose feedback mechanism

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