06 TO 12 December 2021 | Weekly Current Affairs for All Exams | Gaurav Chaudhary Sir

Class 12 Improvement Exam All Details

The number of students appeared for the scholarship exam from School D is approximately what percent of the total number of students appeared for the exam from all the schools together? (a) 12 (b) 24 (c) 29 (d) 18( e) 8

A circular coil of wire 8 cm in diameter has 12 turns and carries a current of 5 A. The coil is in a field where the magnetic induction is 0.6 T. a. What is the maximum torque on the coil? b. In what position would the torque be half as great as in (i) ?

An online exam is attempted by 50 candidates out of which 20 are boys. The average marks obtained by boys is 12 with a variance 2. The variance of marks obtained by 30 girls is also 2. The average marks of all 50 candidates is 15. If mu is the average marks of girls and sigma^(2) is the variance of marks of 50 candidates, then mu+sigma^(2) is equal to __________.