Download Aptitude Crack
img not found img not found

UPSC Civil Service Exam Questions

Q1: A train starts from rest on a curved track of radius 800 m. Its speed increases uniformly and after 3 minutes it is 72 km/hr. Its normal acceleration after 2 minutes is

A

B

C

D

ANS:D -

V = 72km/hr = 72 * 5/18 =2 0m/sec. u = 0m/sec.
t = 3minutes = 3*60 = 180sec ,t = 2 * 60minutes=120sec r=800m.
V=u+at . 20=0+a*180. a=20/180=1/9m/sec^2.
Again V=u+at=0+1/9*120=40/3m/sec.
Normal centripetal acceleration (a)=V^2/r =(40/3)^2/800=1600/9/800=1600/9*800=4/18 m/sec^2.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.