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Important Previous years questions of IIT JEE part - 4 (In Hindi)
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Through this lesson, you can learn the solution of some advanced level questions which has asked in previous years exams of IIT JEE.

## Kumar Ketan is teaching live on Unacademy Plus

Kumar Ketan
#Specialisation in Electronics #6 years teaching experience #Physics Faculty in Kota #"magical education" (211k+ subs) #Writer

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KP VENKAT
9 months ago
Welcome
great....👌😍
Kumar Ketan
9 months ago
Ty
Arti Bhaira
9 months ago
most welcome 😍
1. Home ExploreSearch Courses, Topics &Educators 0 minutes today Kumar Ketan Hey, this is kumar Ketan. I'm graduate in physics and doing further studies. I Edit Profile would love to teach you and give you all my knowledge. 415 Views in last 30 days 1,377 Lifetime Views 7 Courses 499 Followers Following Course Overview Expected topics of Current Affairs for SSC/1BPS/UPSC/PCS/UPPSC/ALL OTHER GOVERNMENT EXAMS with some details COLLISION A col ision as an isolated event in which two or more colliding bodies exert relatively strong forces on each other for a relatively short time CURRENT AFFAIRS Expected topics of General Awareness for UPSC CSE/SSc/ Railway with some details 4 Collision between particles have been divided broadly into two typer: 1. Elastk collision st VOTE enroll By Kumar Ketan By Kumar Ketan By Kumar Ketan (Hindi) Collision for IIT JEE (Hindi) Current Affairs 2018 for UPSC CSE (Hindi) General Awareness: Most Important 50 Question for. 23 Lessons 6 Lessons https://unacademy.com/user/KumarKetan

2. .A disc of mass m is kept floating in air with the help of bullets fired with the same velocity at the rate of n bullets per second. Mass of each Bullet is "m/3" of the disc .lf the bullets rebound with the same speed in opposite direction after striking the disc, then the velocity of bullet at the time of impact is: (a)2g/3n. (b) 3g/2n (c) g/3n. (d) g/2n

3. Solution: Change in momentum of bullet 3 2 3 Now force rate of change of momentum 2fwhere n is no of bullets) nmv This force must be equal to weight of disk for equilibrium Further, condition for equilibrium is:

4. weight of disc Force 2 2 3 3

5. For shown situation,if collision between block A and B is perfectly elastic,then find the maximum energy stored in spring in joules. 3kg -~2m/s 6kg smooth

6. Solution: At maximum compression of spring, velocities of block EB and C are same (say v) then by conservation of linear momentum 3 x 2 - (3+6)v 6-6 m/s At this instant energy stored in a spring - ^ x 3x 2-1(3 +6) (2)

7. 2 2

8. Directions: This question contain statement 1 and statement 2 of the four choices given after the statement choose the one that best describes the two statements. Statement-1: A ball hits the wall and rebounds with same velocity, the momentum and kinetic energy of the system remain conserved. Statement-2: In elastic collision momentum and K.E, both are conserved 1. Statement-1 is true, statement-2 is false 2. Statement-1 is true , statement-2 is true; Statement-2 is the correct 3. 4. Statement-1 is false, statement-2 is true explanation of Statement-1 Statement-1 is true, statement-2 is true, Statement-2 is not the correct explanation of Statement-1