Specimen copy of Resonance Distance Learning program for KVPY SA Stream. Visit @ www.edushoppee.com to purchase.Full description
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Analysis of last three years papers of Stream SA of KVPY examination
INTERVIEW QUESTIONS
Specimen copy of Resonance Distance Learning program for KVPY SA Stream. Visit @ www.edushoppee.resonance.ac.in to purchase.
This is the book for KVPY Examination for Physics of Standard 11thFull description
KVPY INTERview BookletFull description
KVPY QUESTION WITHANSWER(14-10-10)
1.
Sol.
2.
Sol.
If every pair pair from among the equations x2 + px + qr = 0, and x2 + qx + rp = 0 and x2 + rx + pq = 0 has a common root, then the sum of the three common roots is : (A) 2(p + q + r) (B*) p + q + r (C) – (p + q + r) (D) pqr The given equations are x2 + px + qr = 0 ...(i) x2 + qx + rp = 0 ....(ii) and, x2 + rx + pq = 0 ....(iii) Let , be the roots of (i) ; , be the roots of (ii) and , be the roots of (iii). Since is a common root of (i) and (ii). 2 + p + qr = 0 and 2 + q + rp = 0 (p – q) + r (q – p) = 0 = r Now, = qr r = qr = q. Since, and are roots of (ii). Therefore, = rp r = rp = p + + = p + q + r. A truck and a car moving with the same K.E. are brought to rest by the application application of brakes which provide equal retarding force. Which of them will come to rest in a shorter distance : (A) The truck (B) The car (C*) Both will travel same distance before coming to rest (D) The distance of travel will depend on the horse power of the vehicle Suppose mas of car is m and that of truck is M (m < M) retarding force is same and final velocityies and zero For Car v2 = u2 + 2as
u12 s1 = 2a1
........(i)
For Truck
u22 s2 = 2a2
........(ii)
But kinetic energy and same so,
or
1 1 mu12 = mu22 2 2 u12 u22
M m
From (i) and (ii) s1 u12 a2 s2 u12 a1
Here a
So,
1 m
a1 M a2 m
s1 M m s2 m M s1 = s 2
3.
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by mass. Therefore, Theref ore, the ratio of their number of molecules is :
Sol.
4.
(A) 1 : 4
(B) 1 : 8
(C*) 7 : 32
(D) 3 : 16
No. of molecules of O2 No. of molecules of N2
=
Ratio by mass Ratio of molar molecular mass
=
1 28 7 = = 7 : 32 4 32 32
Foot and mouth disease is highly contagious disease almost exclusive to cattle, sheep, swine, goats & other cloven – hoofed animals. t is caused by : (A) fungi (B) bacteria (C) protozoa (D*) virus