Engineering Entrance Questions: Punch of the Week(11-Jan-10)

by Deepa Mittal

What is “Punch Of The Week”?

Every week Learnhub’s team will post one question each on Physics, Chemistry and Mathematics of the IIT-JEE, AIEEE and BITSAT Test Preparation

Members can post their answers along with explanations for the next one week.

After one week, Learnhub’s team will post the official answer along with the explanation.Besides answering the previous week’s questions, Learnhub’s Team will come up with the next set of questions for that week as well.

What are the rules of “Punch Of The Week”?

Every user must refrain from posting sarcastic comments on the answers posted by others.

Once the Learnhub’s team posts the official answer along with the explanation, no comments must be made regarding those questions. In case of further clarification please send a personal message to the respective team member

If you think that there is something wrong with the explanation of the Learnhub’s Team, which seldom happens, please send a personal message to the respective team member informing him/her the same. Posting the same here will not be considered and will be deleted.

Please bear in mind that only Learnhub’s Team members have the privilege of posting questions here. Questions posted by other members will not be entertained and hence will be deleted immediately.

“Punch Of The Week” Team Members

This Week’s Punches

Physics

An ideal gas is expanding such that PT^2 = constant . The coefficient of volume expansion of the gas is
(A) l/T
(B) 2/T
(C ) 3/T
(D) 4/T

Chemistry

Native silver metal forms a water soluble complex with dilute aqueous solution of NaCn is the presence of

(A) Nitrogen
(B) Oxygen
(C ) $Carbon \operatorname{Dioxide}$
(D) Argon

Math

Consider the two curves
C_1 : y^2 = yx ,
C_2 : x^2 + y^2 - 6x + 1 = 0 . Then

(A) C_1 and C_2 touch each others only at one point
(B) C_1 and C_2 touch each others exactly at two points
(C ) C_1 and C_2 intersect (but do not touch) at exactly two points

(D) C_1 and C_2 neither intersect nor touch each other