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Questions

Physics

Two rods of different metals having the same area of cross-section A, are placed between two massive walls as shown in fig. The first rod has length l₁, coefficient of linear expansion

₁ and Young' s modulus Y₁. The corresponding quantities for the second rod are l₂,

₂ and Y₂. The temperature of the both the rods is now raised by T degrees.

(a) Find the force exerted by one rod on the other (at higher temperature) in terms of the given quantities.
(b) Also find the length of each rod at higher temperature.

Chemistry

Multiple-Choice Question
The hybridisation at atomic orbitals of nitrogen in NO₂⁺, NO₃^- and NH₄⁺ are

(a)	sp, sp³ and sp² respectively	(b)	sp, sp² and sp³ respectively
(c)	sp², sp and sp³ respectively	(d)	sp², sp³ and sp respectively

Mathematics

then value of f(2

/3) is

(a)

1

(b)

-1

(c)

2/3

(d)

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