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

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If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be

Post 288

SSC CHSL Questions 2014

Question 197 If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be

A) R/4

B) R/2

C) R

D) 2R

Answer: R/2

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