प्रकाश - परावर्तन तथा अपवर्तन | CLASS 10 - विज्ञान | 7 AM Class by Ruchi Katiyaar Ma'am | L8

12 PM Special Class | Class 11 - STRUCTURE OF ATOM || BOHR MODEL By Yakshu Ma'am

A train M leaves station X at 5 a.m and reaches station Y at 9 a.m. Another train N leaves station Y at 7 a.m. and reaches station X at 10.30 a.m. At what time do the two trains cross each other? 7. 36 adotmdot b. 7. 56 adotmdot c. 8. 36 adotmdot d. 8. 56 adotmdot

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10. (ii) How many children watched television for 15 or more hours a week?

Tabulate , the given data by taking Class intervals : 1-10 , 11- 20 , 21- 30 , 31- 40 Data : 9 , 10 , 8 , 6 , 7 , 4 , 3 , 2, 16 , 28 , 22 , 36 , 24 , 18 , 27 , 35 , 19 , 29 , 23 , 34.

For a decomposition, the values of rate constants at two different temperature are given below: k_(1) = 2.15 xx 10^(-8)L mol^(-1)s^(-1) at 650 K k_(2) = 2.39 xx 10^(-7) L mol^(-1)s^(-1) at 700 K Calculate the value of activation energy for the reaction (R= 8.314 JK^(-1) mol^(-1))

Following table shows the marks scored by a group of 90 students in a mathematics test of 100 marks. Marks 0-20 20-30 30-40 40-50 50-60 60-70 70-100 No. of Students: 7 10 10 20 20 15 8 Find the probability that marks scored by a student in the class is: at most 60 marks (ii) at least 60 marks (iii)not more than 50 marks