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Showing posts with label kinetic energy. Show all posts
Showing posts with label kinetic energy. Show all posts

Friday 10 July 2015

A wire of resitance R is cut into n equal parts

Post 296

SSC CHSL Questions 2014

Question 159 A wire of resitance R is cut into n equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be

A) nR
B) R/n
C) n/R
D) R/n2

Answer : R/n2

Explanation:  because when a wire is cut in two equal parts then the resistance of the combination comes to be R/4.


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Question 160 A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. Which physical quantity is conserved in this process?

A) Momentum and kinetic energy
B) Momentum alone
C) Kinetic energy alone
D) Neither momentum nor kinetic energy

Answer: Momentum alone

A moving neutron collides with a stationary alpha particle

Post 285

SSC CHSL Questions 2014

Question 194 A moving neutron collides with a stationary alpha particle. The fraction of the kinetic energy lost by the neutron is
A) 1/4
B) 1/16
C) 9/25
D) 16/25
Answer: Comment if you know the answer.


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