(A) White
(B) Black
(C) Maroon
(D) Dark Blue
The answer is: (A) White
Tag: relativity mcqs
What is the magnitude of the vector 12i-8j-24k?
(A) 18
(B) 28
(C) 38
(D) 48
The answer is: (B) 28
Solution
Magnitude = sqrt[(12)2+(-8)2+(-24)2]
= sqrt[144+64+576]
= sqrt[784]
= 28
Moment of inertia of solid sphere is
(A) 2/3 Mr2
(B) 1/2 Mr2
(C) 2/5 Mr2
(D) None of these
The answer is: (C) 2/5 Mr2
The moment of inertia of a solid sphere about its diameter is (2/5)Mr2.