Bihar board solutions crash course

In a group of students, there are 24 opting for photography and 26 opting for acting cource. Find the number of students, which are in photography course or in acting coure in the following cases: (i) Two courses are conducted at the same time. (ii) Two courses are conducted at the different time and 8 people are interested in both the courses.

Determine whether of the following two arguments is valid ? Given : If you work hard, then you pass the course. Given : You did not pass the course. Conclusion : You did not work hard .

In how many ways can a students choose 5 courses out of 9 courses if 2 courses are compulsory for every students?

True coelom appeared first in the course of evolution in

A uniform board of length L is sliding along a smooth (frictionless) horizontal plane as in figure. The board then slides across the boundary with a rough horizontal surface. The coefficient of kinetic friction between the board and the second surface surface is mu_k a. Find the acceleration of the board at the moment its front end has traveled a distance x beyond the boundary. b. The board stops at the moment its back end reaches the boundary, as in figure. Find the initail speed v of the board.

The coefficient of friction between the board and the floor shown in figure is mu . Find the maximum force that the man can exert on the rope so that the board does not slip on the floor.

A rough vertical board has an acceleration a so that a 2 kg block pressing against it dows not fall. The coefficient of friction between the block and the board should be

A rough vertical board has an acceleration a so that a 2 kg block pressing against it dows not fall. The coefficient of friction between the block and the board should be

The friction coefficient between the board and the floor shown in figure is mu Find the maximum force that the man can exert on the rope so that the board does not slip on the floor