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Day 199: NDA Maths

5 questions. Try each one first, then open its answer.

  1. Question 1

    Statistics. Asked once: NDA 1 2018 (same type asked 3 times)

    113
    Train: 5 km at 30 km/hr, next 15 km at 45 km/hr. Average speed?

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  2. Question 2

    Vectors. Asked once: NDA 1 2020 (same type asked 3 times)

    66
    If a^\hat{a} is a unit vector in the xy-plane making an angle 30°30° with the positive x-axis, then what is a^\hat{a} equal to?

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  3. Question 3

    Conics. Asked once: NDA 2 2018 (same type asked 3 times)

    52
    The second degree equation x2+4y2−2x−4y+2=0x^2 + 4y^2 - 2x - 4y + 2 = 0 represents

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  4. Question 4

    Statistics. Asked once: NDA 1 2020 (same type asked 3 times)

    104
    The sum of deviations of nn number of observations measured from 2.52.5 is 50. The sum of deviations of the same set of observations measured from 3.53.5 is −50-50. What is the value of nn?

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  5. Question 5

    Statistics. Asked once: NDA 2 2019 (same type asked 3 times)

    110
    Consider the following discrete frequency distribution :
    xx12345678
    ff31545575036259
    What is the value of median of the distribution ?

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