बातचीत पाठ - 1 | Bihar Board Class 12 Hindi 100 Marks | 2022 exam preparation

Evolution part 1|class 12

Give chemical equations for: i] The laboratory preparation of methane from sodium acetate. ii] The reaction of one mole of ethene with one mole of chlorine gas. iii] The preparation of ethyne from 1,2-dibromoethane.

The marks obtained by 30 students of Class X of a certain school in a Mathematics paper consisting of 100 marks are presented in table below. Find the mean of the marks obtained by the students.

a. Estimate the force with which a karate master strikes a board, assuming that hand's speed at the moment of impact is 10.0ms^(-1) , decreasing to 1.00ms^(-1) during a 0.002 s time interval of contact between the hand and the board. The mass of his hand and arm is 1.00 kg . b Estimate the shear, assuming this force it exerted on a 1.00 cm thick pine board that is 10.0 cm wide. c. If we maximum shear stress a pine board can support before breaking is 3.60xx10^(6)N//m^(2) , will the board break?

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is (1) 40 (2) 20 (3) 80 (4) 60

Sentence : Type & Parts || Day 1 || Class 10 English Grammar || UP Board Exam 2022

Sets , Nios, Class-12, Ch-1 ,Ex-1.1 ,Q-1

Means and standard deviations of the scores of an intelligence test of two classes of different sizes of 25 and 75 are M_(1) = 80 marks and M_(2) = 85 marks and SD_(1) = 15 marks and SD_(2) = 20 marks Calculate the combined mean and the standard deviation of the two classes.

In a group of 45 students, 22 can speak Hindi only and 12 can speak English only. If (2lambda+1) student can speak both Hindi and English, the value of lambda is