समतल पृष्ठ द्वारा अपवर्तन | किरण प्रकाशिकी एवं प्रकाशिक यन्त्र | One Shot Day - 7 | Class 12 Physics

A and B together can do a piece of work in 12 days which B and C together can do in 16 days. After A has been working at it for 5 days and B for 7 days, C finishes it in 13 days. In how many days B could finish the work? A और B मिलकर एक काम 12 दिन में कर सकते हैं जसे B और C मिलकर 16 दिन में कर सकते हैं। A द्वारा उस पर 5 दिन और B द्वारा 7 दिन करने के बाद C ने उसे 13 दिन में पूरा कर दिया। B उस काम को कितने दिन में पूरा कर सकता था? Options are (a) 48 day/ 48 दिन (b)24 day/ 24 दिन (c)16 day/ 16 दिन (d)12 day/ 12 दिन

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Class 12 Physics (Hindi) | Chapter 4 गतिमान आवेश एवं चुम्बकत्व | Important Questions and Quick Revision

In a class , 22 studets offered Mathematics , 18 students offered Chemistry and 24 students offered Physics . All of them have to offer atleast one of these . 11 are in both Mathematics and Chemistry ,13 in Chemistry and Physics and 14 in Mathematics and Physics and 7 have offered all the three subjects Find : (i) how many students are there in the class ? (ii) how many students offered only Mathematics ?

In a class of 55 students, the number of students studying different subjects are 23 in Mathematics, 24 in Physics, 19 in Chemistry, 12 in Mathematics and Physics, 9 in Mathematics and Chemistry, 7 in Physics and Chemistry and 4 in all the three subjects. Find the number of students who have taken exactly one subject.

An examination was held during the 2 weeks of April 3rd-Sunday to 16th Saturday. There was 1 paper for the six subjects - Physics, Chemistry, Biology, Maths, English and Hindi. Only 1 paper per day No exam on Saturdays and Sundays and Holiday on April 5th. Only 3 exams were there in a week. Chemistry was before Biology and Maths was on the next day of Hindi. The day on which the paper of biology and maths were held was the same, while that for chemistry and physics was also the same. There was no exam for 3 days between Physics and the exam prior to it. Hindi exam on Tuesday and one exam between Hindi and English exam. There was at least a gap of one day between any 2 science paper. Which of the following exam was held on April 12th ?

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In a class of 55 students the number of students studying subjects are , 23 iin Mathematics 24.in physics 19in chemisty 12 in Mathematics and physics ,9 in Mathematics and chemistry ,7 in physics and chemistry and 4 in all the three subjects. the number of students who have taken ecactly one subject is