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NCERT +1 till chapter 4

All 20 questions from this finished quiz, with the correct answer and explanation. Finished 10 Oct 2026, 10:40 pm IST.
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  1. 1. Chemistry (Some Basic Concepts): How many moles of carbon dioxide are present in 22 g of CO₂?

    A. 0.25

    B. 1

    C. 0.5

    D. 2

    Answer: C. 0.5

    Step-by-step solution

    1. 1Molar mass of CO₂ =12+2(16)=44= 12 + 2(16) = 44 g/mol
    2. 2n=2244=0.5n = \frac{22}{44} = 0.5 mol

  2. 2. Physics (Laws of Motion): A 5 kg block on a rough horizontal floor (μk = 0.2) is pushed by a 20 N horizontal force. Taking g = 10 m/s², what is its acceleration?

    A. 4 m/s²

    B. 2 m/s²

    C. 3 m/s²

    D. 1 m/s²

    Answer: B. 2 m/s²

    Step-by-step solution

    1. 1fk=μkmg=0.2×5×10=10f_k = \mu_k mg = 0.2 \times 5 \times 10 = 10 N
    2. 2a=20−105=2a = \frac{20 - 10}{5} = 2 m/s²

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