पृष्ठीय क्षेत्रफल और आयतन | Class 9 NCERT गणित | 8 PM Class By Kamal Sir | L1 | Hindi Medium

The ratio of curved surface area and volume of a cylinder is 1: 7. The ratio of total surface area and volume is 187 : 770. What is the respective ratio of its base radius and height? एक बेलन के वक्र पृष्ठीय क्षेत्रफल तथा आयतन का अनुपात 1 : 7 है। कूल पृष्ठोय क्षेत्रफल तथा आयतन का अनुपात 187 : 770 है। इसके आधार की त्रिज्या तथा ऊँचाई क्रमशः अनुपात क्या है? Option 1- 5 : 8 Option 2- 4 : 9 Option 3- 3 : 7 Option 4- 7 : 10

If the area of the circular shell having inner and outer radius of 8 cm and 12 cm respectively is equal to the total surface area of a cyclinder of radius R_1 and height h, then h in terms of R_1 will be ____. यदि एक वृत्ताकार सेल का क्षेत्रफल जिसकी अंत तुथा बाहस त्रिज्या क्रमशः 8 सेमी और 12 सेमी है। एक बेलन के सम्पूर्ण पृष्ठीय क्षेत्रफल जिसकी त्रिज्या R_1 और ऊँचाई h बराबर है, तो h, R_1 को पदों में होगा?

Ratio of First ,Second and Third Class train fares between two stations was 8:6:3 .First Class and Second Class train fares are reduced by 1/6 and 1/12 repectively .Ratio of no of passengers in first, second and third class in a year is 4:9:24 .From a stattion total sale of ticket of Rs. 355600 .First the amount collected from first class .

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?

Ratio of the fares of First ,Second and Third class catogory of a train , between two stations is 10:7:2 and the ratio of passenger travelling in these category is 4:9:17 respectively .If the fare is increased by 1/4 in First class , 1/8 in second class and decreased by 10% i Third Class and the ratio of number of passenger in the category remains same .If the total amount received of Rs. 60590 , then find the total amount received from thrid class category .

Between two railway staions the fare of 1^(st), 2^(nd) and 3^(rd) class are in the ratio 8:6:3. But later on the fare of 1^(st) and 2^(nd) class is decreased by (1)/(6) and (1)/(12) spectively. In one year the no. of passengers of 1, 2nd and 3rd class are in the ratio for 4:9:24. If total tickets amounting Rs 355600 are sold then find the fare of all 3rd class.

For recruiting Management Trainees in an organisation, thefollowingcriteriahavebeenlaiddown. The candidate must: (A) be a first class graduate in Commerce with at least 65% marks. (B) have secured at least 70% marks in SSC. (C) be not more than 26 years and not less than 21 years of age as on 1.8.2007. (D) have secured at least 60% marks in selection test. (E) have secured at least 50% marks in selection interview. However, if a candidate fulfils all the above mentioned criteria EXCEPT- (i) at (A) above but is an Economics graduate with at least 70% marks, the case may be referred to the GM of the organisation. (ii) at (E) above but has secured at least 40% marks in selection interview and at least70% marksin selection test, the case may be referred to the President of the organisation. In each of the questions below, information of one candidate is given. You have to take one of the following five dedsions based on the information provided and the criteria and conditions given above. You are not to assume any thing other than the information provided in each question. All these cases are given to you as on 1.08.2007. You have to indicate your dedsion by marking answers to each question as follows: Ashwini is a B.Com passed in first class with 68% marks. She had scored 75% marks in SSC. Her date of birth is 14.9.1984. She had cleared the selection test with 74% marks and selection interview with 45% marks.