From a right cone of height h and with base radius r a cone has been cut of from the centre of the height. The volume of remaining frustum of the cone is.
(A)
(B)
(C)
(D)
From a circle of radius a, a sector, which subtend an angle π/5 at the centre has been cut off. The perimeter of the remaining part of the circle is
(A) 2πa
(B)
(C)
(D)
Which of the following is largest fraction amongst
(A)
(B)
(C)
(D) None of these
Sum of 5 times of a fraction and 4 times its reciprocal is 9. What is fraction?
(A)
(B)
(C)
(D)
The average age of 30 students of a class is 15 years. A 20-year-old student left the class and replaced by two new students, whose age difference is 5 years. If the average age of all students is 15 years, then what will be ratio of young student to elder students.
(A) 4 :5
(B) 3:5
(C) 3:4
(D) 4:3
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