JEE MAIN Date: 09 Jan 2019 OFFICIAL ONLINE EXAM / 9 ... · RAO IIT ACADEMY / JEE - MAIN OFFICIAL...

RAO IIT ACADEMY / JEE - MAIN OFFICIAL ONLINE EXAM / 9 January-19 Slot- II / Solutions

/ JEE MAINOFFICIAL ONLINE

EXAM / 9 January19Slot II / Solutions

Date: 09 Jan 2019

Rao IIT Academy Website : www.raoiit.com1


1. Di�iculty : Medium

Topics :

Simple harmonic motion,




Topics :

Modern Physics,

If particle making circular path in magnetic field.

then ____________(I)

if particle path is straight line in magnetic and electric field. Only possible when magentic force is equal electric field force onthe particle

i.e _____________ (II)

From (I) and (II)



3.Di�iculty : Medium

Topics :

Modern Physics,

At

4. Di�iculty : Easy

Topics :

Ray Optics,

Angle between two mirror will be




Topics :


P.E = K.E

or

Position of the particle at



6.Di�iculty : Easy

Topics :

Kinematics,

___________ (I)

___________ (II)




Topics :

Electrostatics,




Topics :

Physics,

As use know,


Topics :

ELECTROMAGNETISM,

Energy associated with electric field and with magnetic field is same for electromagnetic wave in free space.




Topics :

Semiconductors,

then,

________ (I)

If diode connect are reversed then

then

__________ (II)

Change in




Topics :

Gravitation,

Energy required to take a satellite to heigh

_______________ (I)

Kinetic energy required for the satellite to be in circular path is

________ ( II)




Topics :

Communication systems,

Available 1% frequency as a signal band

No. of channels accomodated for transmitting TV signals


Topics :

Thermodynamics,

Amount of heat transfer




Topics :

Physics,

Here, +ve zero error

True reading = (Main scale) + (Circular L.C) - (+ve error)


Topics :

Units,Dimensions & Error analysis,

Units of

By elimination method




Topics :

Current electricity,

Power

Power

Heat energy




Topics :


current in CDEF branch is

Voltage drop across is

Total potential drop across CF or DE is

Potential drop across BC =

Total current




Topics :

Sound wave,

for given pipe, frequency for second harmonic,

appearent frequency heard by running person


Topics :

Wave optics,

Number of bright fringes ( just above the C.M.)

Total no. of bright frings =




Topics :



Topics :


BONUS


Topics :


Resistance




Topics :

Work ,Energy and power,

Let's findout acceleration is constant or variable.

...(a = const)

displacement in 1st 5 sec

24. Di�iculty : Di�icult

Topics :

Photoelectric e�ect,

....I

work function = 4.7 = eV

for maximum K.E.,

We know,

for max. K.E. we will take



25.Di�iculty : Di�icult

Topics :

Electrostatics,




Topics :

Newton's Laws of motion,

and

... (for equilibrium)

...(i)




Topics :

Thermodynamics,

If then




Topics :

MAGNETISM,

(1) Circular loop :

...(i)

(2) Circular coil :

...(ii)

From (i) and (ii)




Topics :


As

So

As

So


Topics :

Rotational Motion,




Topics :

Chemical Kinetics,

Products

....(1)

both A and B doubled

.....(2)

Only A is doubled

....(3)

from (1) and (3)


Topics :

Aldehydes,Ketones,


Topics :

d-block,F-block,

Zn has lowest enthalpy of atomisation due to very weak metallic bonding due to absence of unpaired d-electron.


CHEMISTRY



Topics :

AMINES,

pKa Basicity


Topics :

Nitrogen containing compounds,


Topics :

Electrochemistry,




Topics :

PERIODIC PROPERTIES,

Second electron gain enthalpy is positive as energy needs to be applied to add to a negatively charge ion.


Topics :

Aldehydes,


Topics :

Nitrogen containing compounds,




Topics :

GOC,


Topics :

STRUCTURE OF ATOM,

Order of spread of orbitals

Same is order of decreasing orbital angular momentum.

Statement (A) is correct

for distribution peak of orbitals shi�s towards le� / decreasing

Statement (B) is correct. Hence option (1) is correct.


Topics :

Environmental Chemistry,

pH of rain water is 5.6 due to formation of carbonic acid is atmosphere




Topics :

Coordination Compounds,

Higher absorbed wavelength weaker the ligand.


Topics :

Thermodynamics,


Topics :

Solid State,

density of copper crystal.

Edge length


Topics :

Coordination Compounds,

is a strong field ligand hence will come higher splitting energy.




Topics :

Solutions,

(Ice separated)


Topics :

P-block-II,

has tow bonds


Topics :

Chemical Bonding,

bond order paramagnetic

bond order diamagnetic.


Topics :

Aldehydes,Ketones,

(a) 2,4- DNP test : Coloured compound : group may be aldehyde (or) ketone

(b) Iodoform test : Yellow precipitate presence of methyl ketone

(c) Azodye test : No dye formation : Nitrogen of amine does not involve in diazotisation hence no dye formation.




Topics :

S-block,

is only group 1 element which forms nitrides.


Topics :

BIOMOLECULES ,


Topics :

Metallurgy,

Using given elignham diagram.

can reduce at all temperatures.


Topics :

Environmental Chemistry,

Methemoglobinemia is caused by nitrates in water.


Topics :

PRACTICAL ORGANIC CHEMISTRY,

Benzaldehyde -Absorbate

Alumina - Adsorbent

Acetonitrile - Colourless liquid - Mobile phase in chromatography. It is simplest organic nitrile used as polar aprotic solvent.




Topics :

Chemical equilibrium,


Topics :

Mole concept,

is

moles produce moles

moles produce moles


Topics :

Hydrogen & Its compound,

Temporary hardness is due to presence of bicarbonates of calcium and magnesium.

29. BDi�iculty : Easy

Topics :

Surface Chemistry,

solution is negatively charged sol so by using hardy-Schulze rule large charge on cation is required for e�ectivecoagulation. will be the answer.




Topics :

CARBOXYLIC ACIDS AND ITS DERIVATIVES,

In presence of lewis acid electrophile attacks the benzene ring.


Topics :

Straight lines,

Equation of ...(i)

is point of intersection of and and and ispoint of intersection and .

Find point and , then


MATHEMATICS



Topics :

Sequence & Series,




Topics :

Vectors,

...(i)




Topics :

Indefinite integration,




Topics :

ContinuityDi�erentiability & Derivatives,

and

when point is

Now eliminating

again di�. :


Topics :

Inverse Trigonometric Functions,




Topics :

Hyperbola,

Hyperbola : ...(i)

(i) contains


Topics :

Sequence & Series,

Let be first term of A.P. and be common di�erence.

...(i)

...(ii)

...(iii)

in G.P.




Topics :

Area bounded by the curves,

(region above x-axis including x-axis)


Topics :

Binomial Theorem,

Coe�. of in

Coe�. of in

Coe�. of in




Topics :

Complex Numbers,

is root of i.e or


Topics :

MATRICES,




Topics :

Trigonometric Equations,

then


Topics :

Three Dimensional Geometry,




Topics :

Three Dimensional Geometry,

Plane containing

--------- (1)

Required plane : ------(2)

No. (2) contains

(1) & (2) are


Topics :

PERMUTATION AND COMBINATION,

using symmetricity




Topics :

Quadratic Equations,

roots real & distined

------(1)

considering roots lie in

-------- (2)

---- (3)

----(4)

using &


Topics :

Quadratic Equations,

for roots to be rational, D should be non-negative perfect square and given as positive integer.

but does not give D as perfect square

So,




Topics :

ContinuityDi�erentiability & Derivatives,Definite integration,

is a constant function

as


Topics :

Application of derivatives,Conics,

area

Max. area




Topics :

Probability,

Probability that IInd ball is red


Topics :

Definite integration,


Topics :

Di�erential Equations,

put but

is constant




Topics :

Limits,


Topics :

Circles,

: family of circle with centre at & variable radius.

Distance between centre:


Topics :

Permutations & Combinations,

Number of natural numbers less than 7000 using 0,1,3,7,9 (rep. allowed)

Single digit : 4

two digit : 4.5 =20

Three digit : 4.5 .5 = 100

4 digit but less than 7000 : 2.5.5.5 =250

So no. are : 250 +100 +20 +4=374.




Topics :

Determinants & Matrices,

---------(1)

-------(2)

-------(3)

System is consistent


Topics :

STATISTICS,

--------(1)

-------(2)




Topics :

Functions,

Function is injective but not surjective.


Topics :

Mathematical reasoning,


JEE MAIN Date: 09 Jan 2019 OFFICIAL ONLINE EXAM / 9 ... · RAO IIT ACADEMY / JEE - MAIN OFFICIAL...

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