class 12

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JEE Main

Which of the following on heating with aqueous $KOH$, produces acetaldehyde ?

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Due to the presence of the current \displaystyle{I}_{}

The differential equation of the family of circles with fixed radius 5 units and centre on the line $y=2$is

The perpendicular bisector of the line segment joining P (1, 4) and Q (k, 3) has y-intercept $−4$. Thena possible value of k is

The sum of the series$_{20}C_{0}−_{20}C_{1}+_{20}C_{2}−_{20}C_{3}+…−…+_{20}C_{10}$ is:

The transition from the state $n=4ton=3$ in a hydrogen like atom results in ultraviolet radiation Infrared radiation will be obtained in the transition from

If the difference between the roots of the equation $x_{2}+ax+1=0$is less than $5 $, then the set of possible values of a is

A wave travelling along the x-axis is described by the equation $y(x,t)=0.005cos(αx−βt)$. If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then $αandβ$ in appropriate units are

A die is thrown. Let A be the event that the number obtained is greater than 3. Let B be the event that the number obtained is less than 5. Then $P(A∪B)$is