class 12

Physics

Waves & Oscillation

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude is 5s. In another 10s it will decrease to $α$ times its original magnitude, where $α$ equals.

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If z is a complex number such that $∣z∣≥2$, then the minimum value of $∣∣ z+21 ∣∣ $

The integral $∫_{2}gx_{2}+g(36−12x+x_{2})dxgx_{2} $ is equal to:

$(lim)_{x0}((1−cos2x)xtan4x3+cosx $ is equal to:

If $(10)_{9}+2(11)_{1}(10)_{8}+3(11)_{2}(10)_{7}+¨+10(11)_{9}=k(10)_{9}$, then k is equal to

If x, y, z are in A.P. and $tan_{−1}x,tan_{−1}yandtan_{−1}z$are also in A.P., then

The order of stability of the following carbocations:

The number of integers greater than $6,000$ that can be formed, using the digits $3,5,6,7and8,$ without repetition, is :

A compound with molecular mass 180 is acylated with $CH_{3}COCl$ to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is: