PYQ Vault

Day 176: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Magnetic Effects of Electric Current. Asked once: 2023 (same type asked 4 times)

    14
    A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in the figure. The direction of the magnetic field will be north to south at a point :

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  2. Question 2

    Magnetic Effects of Electric Current. Asked once: 2024 (same type asked 4 times)

    15
    A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will

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  3. Question 3 (case study, 4 parts)

    Metals and Non-metals. Asked once: 2024 (same type asked 4 times)

    Three metal samples of magnesium, aluminium and iron were taken and rubbed with sand paper. These samples were then put separately in test tubes containing dilute hydrochloric acid. Thermometers were also suspended in each test tube so that their bulbs dipped in the acid. The rate of formation of bubbles was observed. The above activity was repeated with dilute nitric acid and the observations were recorded.
    37 (a)
    When activity was done with dilute hydrochloric acid, then in which one of the test tubes was the rate of formation of bubbles the fastest and the thermometer showed the highest temperature ?
    37 (b)
    Which metal did not react with dilute hydrochloric acid ? Give reason.
    37 (c) (i)
    Why is hydrogen gas not evolved when a metal reacts with dilute nitric acid ? Name the ultimate products formed in the reaction.
    37 (c) (ii)
    Name the type of reaction on the basis of which reactivity of metals is decided. You have two metals X and Y. How would you decide which is more reactive than the other ?

  4. Question 4

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    6
    The metals obtained from their molten chlorides by the process of electrolytic reduction are :

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  5. Question 5

    Metals and Non-metals. Asked once: 2024 (same type asked 4 times)

    28 (b)
    State giving reason for the change in appearance observed when each of the following metal is exposed to atmospheric air for some time : (i) Silver, (ii) Copper and (iii) Iron