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Important Previous years questions of IIT JEE Part - 1 (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

U
nice video to learn
PG
sir why are we assuming that after the collision the velocity of the beads remain same??
Kumar Ketan
8 months ago
Pls mention the time of doubt
very comprehensive you are a reliable educator on unacademy
Kumar Ketan
a year ago
ty
welcome
very good gjb explaination 😍👌
i don't know how to find momentum plzz explain again
Kumar Ketan
a year ago
Sure

2. A large number (n) of identical beads, each of mass m and radius r are strung on a thin smooth rigid horizontal rod of length "L" (L>>r) and are at rest at random position. The rod is mounted between two rigid supports (see figures). If one of the beads is now given a speed "v', the average force experienced by each support after a long time is (assume all collisions are elastic) JEE (Main)Online-2015 2 (L- nr) (L- nr) (c) zero (d) mv2 (L- 2nr)

3. Fig-a

4. . Solution: Change in momentum in each collision with rigid support Space between the supports for motion of beads is "L-2nr" Time gap between two successive collision with same support = 2L_4nr 0 2mv

5. A particle of mass "m" moving in the X- direction with speed "2v" is hit by another particle of mass "2m" moving in the Y- direction with speed "v". If the collisions perfectly inelastic, the percentage loss in the energy during the collision is close to: 1 JEE Main (2015) (a) 56% (b) 62% (c) 44% (d) 50%

6. Solution: Before collision: 2v Y-axis 2m X-axis Kinetic energy Before collisionm (2v)2+ 2m (v)23mu2

7. After collision Applying Momentum conservation for inelastic collision 2mv 2 3 101- 22 0) 3

8. 1 2 2 /2 3 2 4 3 5 3 Ki-K, 3 3mm) 5 5 ~ 56%

9. This question has statement 1 and statement 2. Of the four choices given after the Statements, choose the one that best describes the two statements Statement-1: A point particle of mass m moving with speed v collides with stationary point particle of mass M .If the maximum energy loss possible is given as f the Statment-2:Maximum energy loss occurs when the particles get stuck together as a result of the collision. n fm M+ m Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation of Statement-1 Statement-1 is true, Statement-2 is true, Statement-2 is a not correct explanation of Statement-1 Statement-1 is true, Statement-2 is false. Statement-1 is false, Statement-2 is true. 1. 2. 3. 4.