Std-10 Most Imp Ch 9 Gseb L-15

L-9 to L-11

L-6 to L-9

Most common bacterial STD is:

In the set of integers modulo 9, 15 ox_(9) 10 = __________.

A gas occupies a volume of 2.5 L at 9xx10^(5)Nm^(-2) . Calculate the additional pressure required to decrease the volume of the gas to 1.5 L , Keeping temperature constant.

Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . Find the focal length of the lens.

The mean of the observation 7, 8, 9, 11 and 15 is 10.

Find the mean of the following distribution: 4 6 9 10 15 5 10 10 7 8

Consider a regular 10-gon with its vertices on the unit circle. With one vertex fixed, draw straight lines to the other 9 vertices. Call them L_1 , L_2 ,…, L_9 and denote their lengths by l_1 ,l_2 ,…, l_9 respectively. Then the product l_1 , l_2,...,l_9 is