JEE MAIN 2023 ONLINE 6TH APRIL MORNING SHIFT
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The setting time of Cement is increased by adding :
By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by \(21 \%\) ?
The sum of the first \(20\) terms of the series \(5+11+19+29+41+\ldots\) is :
A compound is formed by two elements \(\mathrm{X}\) and \(\mathrm{Y}\). The element \(\mathrm{Y}\) forms cubic close packed arrangement and those of element \(\mathrm{X}\) occupy one third of the tetrahedral voids. What is the formula of the compound?
A person driving car at a constant speed of \(15 \mathrm{~m} / \mathrm{s}\) is approaching a vertical wall. The person notices a change of \(40 \mathrm{~Hz}\) in the frequency of his car's horn upon reflection from the wall. The frequency of horn is _______________ \(\mathrm{Hz}\).
(Given: Speed of sound : \(330 \mathrm{~m} / \mathrm{s}\) )
If \({ }^{2 n} C_{3}:{ }^{n} C_{3}=10: 1\), then the ratio \(\left(n^{2}+3 n\right):\left(n^{2}-3 n+4\right)\) is :