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JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
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90
Duration
180 mins
Package
IIT-JEE Main - Previous Year Papers
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90questions
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90questions
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2019 · Physics · Mechanics · Simple Harmonic Motion
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
A damped harmonic oscillator has a frequency
of 5 oscillations per second. The amplitude
drops to half its value for every 10 oscillations.
The time it will take to drop to
1/1000 of the original amplitude is close to :-
2019 · Chemistry · Physical Chemistry · Solid State
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
0.27 g of a long chain fatty acid was dissolved
in 100 cm3 of hexane. 10 mL of this solution
was added dropwise to the surface of water in
a round watch glass. Hexane evaporates and a
monolayer is formed. The distance from edge
to centre of the watch glass is 10 cm. What is
the height of the monolayer?
[Density of fatty acid = 0.9 g cm–3, \(\pi\) = 3]
[Density of fatty acid = 0.9 g cm–3, \(\pi\) = 3]
2019 · Mathematics · Trigonometry · Properties Of Triangle
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
If the lengths of the sides of a triangle are in A.P.
and the greatest angle is double the smallest, then
a ratio of lengths of the sides of this triangle is :
2019 · Physics · Electricity · Current Electricity
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
In the circuit shown, a four-wire potentiometer
is made of a 400 cm long wire, which extends
between A and B. The resistance per unit length
of the potentiometer wire is r = 0.01 \(\Omega\)/cm. If
an ideal voltmeter is connected as shown with
jockey J at 50 cm from end A, the expected
reading of the voltmeter will be :-
2019 · Chemistry · Physical Chemistry · Solid State
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
Consider the bcc unit cells of the solids 1 and
2 with the position of atoms as shown below.
The radius of atom B is twice that of atom A.
The unit cell edge length is 50% more in solid
2 than in 1. What is the approximate packing
efficiency in solid 2?
2019 · Mathematics · Algebra · Sequences And Series
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
The sum
\(\sum\limits_{k = 1}^{20} {k{1 \over {{2^k}}}}\) is equal to