JEE Main Test 25

Result

JEE Main Test 25

Score
-
out of -
Rank
-
out of -

TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

The species which can best serve as an initiator for the cationic polymerization is :

A
LiAIH₄

B
HNO₃

C
AICI₃

D
C₄H₉Li

Solution

Lewis acids can initiate the cationic polymerization.
Hence, option C is correct.
Question 2
4 / -1

A hollow metal sphere is filled with water and hung by a long thread. A small hole is drilled at the bottom through which water slowly flows out. Now the sphere is made to oscillate, the period of oscillation of the pendulum -

A
Remains constant

B
Continuously decreases

C
Continuously increases

D
First increases and then decreases

Solution

First water leak outs from metal sphere due to this c.m of the system shift downward therefore effective length of simple pendulum increases. So T ∝ η; So T also increases. After that slowly c.m again rises upward & due to its η decreases and T ∝ η, Then T decreases and finally c.m set previous position S. Time period also attain starting value.