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The wavelength of the second line of Balmer series in
the hydrogen spectrum is `4861 A`. The wavele
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The number of permutations of the word `HINDUSTAN` such that none of the three
patterns HIN, DUS, T
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The distance between the lines `3x + 4y = 9` and `6x + 8y + 15 = 0` is:
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If `M` is the mass of the earth and `R` its radius, the ratio of the gravitational acceleration and
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An ideal refrigerator has a freezer at a
temperature of `- 13^oC.` The coefficient of
performance
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One factor of the determinant
`| (a,b,c,d),(b,c,d,a),(c,d,a,b),(d,a,b,c)|` is :
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