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# JEE Main Mock Test 9

## 90 Questions MCQ Test JEE Main Mock Test Series 2021 & Previous Year Papers | JEE Main Mock Test 9

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This mock test of JEE Main Mock Test 9 for JEE helps you for every JEE entrance exam. This contains 90 Multiple Choice Questions for JEE JEE Main Mock Test 9 (mcq) to study with solutions a complete question bank. The solved questions answers in this JEE Main Mock Test 9 quiz give you a good mix of easy questions and tough questions. JEE students definitely take this JEE Main Mock Test 9 exercise for a better result in the exam. You can find other JEE Main Mock Test 9 extra questions, long questions & short questions for JEE on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### [(-1 + √(-3))/2]3n +[(-1 - √(-3))/2]3n is equal to

Solution:
QUESTION: 4

The area of the triangle formed by joining the origin of the points of intersection of the line x √5 + 2y = 3√5 and the circle x2 + y2 = 10 is

Solution:
QUESTION: 5

The area bounded by the x-axis and the curve y = 4x − x2 − 3 is

Solution:

y = 0, y = 4x - x2 - 3
⇒ 4x - x2 - 3 = 0
⇒ x2 - 4x + 3 = 0
⇒ (x - 1) (x - 3) = 0
⇒ x = 1, 3

QUESTION: 6

If f: R → R defined by f x is continuous function, then

Solution:
QUESTION: 7

If , then what is the value of k ?

Solution:
QUESTION: 8
If x=a[(cost)+(log tan(t/2))], y=a sint, (dy/dx)=
Solution:
QUESTION: 9

The radius of the circle passing through the foci of the ellipse ((x2/16) + (y2/9) = 1), and having its centre (0,3) is

Solution:
QUESTION: 10

The solution of is

Solution:
QUESTION: 11

If c is parameter then the differential equation whose solution is is

Solution:

QUESTION: 12

Solution:
QUESTION: 13

Sneha says "The number I am thinking is divisible by 2 or it is divisible by 3". This statement is false if the number Sneha is thinking of is

Solution:

This sentence contains the word "or" (disjunction). A disjunction is only false if BOTH conditions are false. The only number that is not divisble by 2 and is not divisible by 3 is 11.

QUESTION: 14

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If n and r are positive integers such that 1 ≤ r ≤ n, then
Reason(R):

Solution:
QUESTION: 15

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Two dice are thrown simultaneously . The probability of obtaining a total score of 5 is 0.11 .
Reason(R): A subset of the sample space S which contains more than one elements is called mixed events.

Solution:
QUESTION: 16

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):The slope of the line whose equation is 5x + 6y = 7 is − 5/6 and the y-intercept is 7/6
Reason(R): The equation of straight line which makes an angle θ with x-axis and intercept c on the y-axis is y = mx - c, where m = tan θ

Solution:
QUESTION: 17
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):ABC is a triangle, where A â‰¡(2,3,5), B â‰¡ (-1,3,2) and c â‰¡ (Î»,5,Î¼). If the median through A is equally inclined towards the axes, then the values of Î» and Î¼ are respectively 7 and 10.
Reason(R): If median through A is equally inclined to the axis, then its direction ratios will be equal (say k), where k is a constant.
Solution:
QUESTION: 18

If A is a non-zero column matrix of order m x 1 and B is a non-zero row matrix of order 1 x n, then rank of AB is equal to

Solution:
QUESTION: 19

Minimum area of the triangle formed by any tangent to the ellipse with the coordinate axes is

Solution:

QUESTION: 20

Which of the following relations among the locations parameters does not hold?

Solution:
QUESTION: 21

Two tangents are drawn from the point (-2,-1) to the parabola y2=4x. If α is the angle between them, then tan α =

Solution:
The eqn of any tangent to a parabola y^2 = 4ax is y = mx+a/m
So the equation of any tangent to this parabola, would be y=mx+1/m (as a=1, for y^2=4x)

Now these tangents pass through (-2,-1)... so -1=-2m+1/m

Or 2m2-m-1=0.

Where m1,m2 are the slopes of the two tangents that satisfy this equation (m1,m2 are the roots of the quad)....

So tan(angle between the tangents) = |(m1-m2)/(1+m1m2)|

Now m1m2 = -1/2

And m1-m2 = root { (m1+m2)2-4m1m2 } = root [ (1/2)2 - 4(-1/2) ] = root[9/4].

So |m1-m2| = 3/2.

Hence tan(Angle) = (3/2) / (1/2) = 3
QUESTION: 22
The number of ways in which 5 boys and 3 girls be seated in a row so that each girl is between two boys is
Solution: First boys are seated in 5 position in 5! Ways, now remaining 4 places can be filled by 4 girls in 4! Ways.
So number of ways = 5! 4! = 2880
QUESTION: 23

A coin and six faced die, both unbiased, are thrown simultaneously. The probability of getting a head on the coin and an odd number on the die is

Solution:
QUESTION: 24
If the 7th term of an H.P. is 1/10 and 12th term is 1/25, then the 20th term is
Solution:
QUESTION: 25

Sin⁻1(3/5) + tan⁻1(1/7) is equal to

Solution:
QUESTION: 26

In a Poisson distribution the variance is m. The sum of the terms is odd places in this distribution is

Solution:
QUESTION: 27
The equation of the plane passing through the intersection of the planes x + 2y + 3z + 4 = 0 and 4x + 3y + 2z + 1 = 0 and the origin is
Solution: The equation of required plane is
(x + 2y + 3z + 4) + Î» (4x + 3y + 2z + 1) = 0
It passes through (0, 0, 0) So
4 + Î» = 0
Î» = - 4
So the equation of plane is
(x + 2y + 3z + 4) -4 (4x + 3y + 2z + 1) = 0
or x + 2y + 32 + 4 - 16x - 12y - 82 - 4 = 0
or 15x + 10y + 5z = 0
or 3x + 2y + z = 0
QUESTION: 28
In âˆ†ABC cosecA(sinB cosC+cosB sinC)=
Solution:
QUESTION: 29
The position vectors of A and B are i-j+2k and 3i-j+3k, then the position vector of mid point of AB is
Solution:
QUESTION: 30

is equal to

Solution:
QUESTION: 31

2R ― OH + 2Na → 2RONa + H₂. In the above reaction the reactivity of different alcohols is

Solution:
QUESTION: 32

A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour is noticed, the cation would be

Solution:
QUESTION: 33

The configuration of X is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3. Its properties are similar to

Solution:
QUESTION: 34

Reference proteins are those obtained from

Solution:
QUESTION: 35

The effect of atoms or groups loosing electrons towads a carbon atom is called

Solution:
QUESTION: 36

If we know the bond of NO and NO+, then which of the following statement is true for these two species?

Solution:

Bond order of NO is 2.5 while that of NO+ is 3. Bond length is inversely proportional to the bond order.

QUESTION: 37

The correct order of the O―O bond length in O2, H2O2 and O3 is___

Solution:

The bond length of O―O bond in O3 (1.278Å) is intermediate that for a single bond in H2O2 (1.48 Å) and for a double bond in O2 (1.121 Å).

QUESTION: 38

Which of the following compound has a linear structure?

Solution:
QUESTION: 39

The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 KJ mol⁻1 respectively .The enthalpy of formation of carbon monoxide per mol is

Solution:
QUESTION: 40

A chemical reaction is catalyzed by a catalyst X. Hence X

Solution:
QUESTION: 41

The activation energy of a reaction can be determined by

Solution:
QUESTION: 42

Heat of combustion ΔH for C(s), H2(g) and CH4(g) are -94, -68 and -213 cal/mol. Then ΔH for C(s) + 2H2(g) → CH4(g) is

Solution:

CH4 + 2O2 = CO2 + 2H2O
ΔH = -213 cal/mol .....(1)
C + O2 = CO2
ΔH = - 94 cal/mol .....(2)
H2 + (1/2) O2 = H2O
ΔH = - 68 cal/mol .....(3)
ΔH for C(s) + 2H2(g) → CH4(g)
= 2(eq 3) + (eq 2) - (eq 1)
= (- 68 x 2) + (- 94) - (- 213) = -17Kcal

QUESTION: 43

In the reaction CH2COOHaq + OH(aq) → CH3COO- + H2O(l) ; ΔH = -55.2kJ mol-1 What is the heat of dissociation (in kJ mol-1) of acetic acid?

Solution:

ΔH = -55.2 KJ.mol-1
-[H+ (aq) + OH- (aq) → H2O(l) ΔH = -57.3 KJ .mol-1]]

CH2COOHaq → CH3COO- (aq) + H+ (aq) ΔH = ?
CH2COOH(aq) + OH- (aq) → CH3COO- (aq) + H2O(l) ΔH = -55.2 KJ .mol-1
-H+ + OH- (aq) → - H2O(l) ΔH = + 57.3KJ .mol-1
CH3COOH(aq) → CH3COO- (aq) + H+(aq) ΔH = 2.1 KJmol-1

QUESTION: 44

Which of the following is an example of intensive property?

Solution:
QUESTION: 45

Which of the following is an isomers of propanal ?

Solution:
QUESTION: 46

Eka-aluminium and eka-silicon are known as

Solution:

Gallium and Germanium were unknown at the time when Mendeleev's periodic table was formulated. But Mendeleev's predicted the properties of these elements and named them eka-aluminium and eka-silicon. Later when these elements were discovered, their properties were found to be similar to those of aluminium and silicon.

QUESTION: 47

Which of the following is the correct order of ionic radii?

Solution:

Na+, Mg2+, Al3+ and Si4+ are isoelectronic cations with 10 electrons, but when we go from Na+ to Si4+, one unit nuclear charge increases. Thus, the ionic size of isoelectronic species is compared on the basis of their atomic number/number of electrons, i.e. Z/e ratio. Smaller the value of Z/e, larger the size of the species. For example,

QUESTION: 48

Among the following complexes, optical activity is possible in__

Solution:

Optical isomers of [Co(NH3)2(H2O)2Cl2] are

QUESTION: 49

Which of the following belongs to the actinide series?

Solution:
QUESTION: 50

The charge required to liberate 112 ml of hydrogen from acidified water is

Solution:
QUESTION: 51

In electrorefining of copper a minor percentage of gold accumulates in

Solution:
QUESTION: 52

A gaseous mixture of three gases A, B and C has a pressure of 10 atm. The total number of moles of all the gases is 10. If the partial pressures of A and B are 3.0 and 1.0 atm respectively and if C has a mol. wt. 2.0. What is the weight of C in gms present in the mixture?

Solution:
QUESTION: 53

In which of the following reactions, H₂O₂ acts as a reducing agent?

Solution:
QUESTION: 54

Which of the following compounds does not exist ?

Solution:
QUESTION: 55

Which of the following possesses highest melting point?

Solution:
QUESTION: 56

When ethylene glycol is heated with acidified potassium permanganate, the main organic compound obtained is:

Solution:
QUESTION: 57

Relatives stabilites of the following carbocation will be in order :

Solution:
QUESTION: 58

In the addition of HBr to propene in presence of peroxide, most stable free radical formed is :

Solution:
QUESTION: 59

Increasing order of acid strength among p-methoxyphenol, p-methylphenol and p-nitrophenol is

Solution:

Electron withdrawing groups increase the acid strength while electron releasing groups decrease the acid strength of the phenol.
-NO2 group is strongly withdrawing group while -CH3 is mildly releasing and -OCH3 is strongly releasing group. Thus, p-methoxyphenol is the weakest acid while p-nitrophenol is the strongest acid among the given compounds.

QUESTION: 60

The molecule which shows optical isomerism is

Solution:
QUESTION: 61

The decay constant λ of the radioactive sample is the probability of decay of an atom in unit time, then

Solution:
QUESTION: 62

A radioactive substance decays to 1/16th of its initial activity in 40 days. The half-life of the radioactive substance is

Solution:
QUESTION: 63

By increasing the temperature, the specific resistance of a conductor and a semiconductor

Solution:
QUESTION: 64

On increasing the temperature of a conductor, its resistance increases because

Solution:
QUESTION: 65

An electron and a proton have same de-Broglie's wavelength. The kinetic energy of an electron is

Solution:
QUESTION: 66

During X-ray formation if voltage is increased

Solution:
QUESTION: 67

An electromagnetic wave of frequency 3 MHz passes from vacuum into a medium with dielectric constant k = 4. Then

Solution:
QUESTION: 68

Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is

Solution:
QUESTION: 69

If 1000 droplets each of charge q and radius r are mixed to form a big drop, then the potential of big drop, as compared to small droplet will be

Solution:

If the value of potential on each small drop be V and potential on each small drop be V '
V ' = n 2/3 V
⇒ V ' = 1000 2/3 V

QUESTION: 70

The gravitational potential energy of a body (in earth's field) is minimum

Solution:
QUESTION: 71

If mass of a body is M on the earth surface, then the mass of the same body on the moon surface is

Solution:
QUESTION: 72

A black body, at a temperature of 227ºC, radiates heat at a rate of 84 J-m⁻2-s⁻1. When its temperature is raised to 727ºC, the heat radiated by it in J-m⁻2-s⁻1 will be

Solution:
QUESTION: 73

The energy spectrum of a black body exhibits a maximum around a wavelength λ₀. The temperature of the black body is now changed such that the energy is maximum around a wavelength 3λ₀/4. The power radiated by the black body will increase by a factor of

Solution:
QUESTION: 74

Momentum is closely related to

Solution:
QUESTION: 75

If 10% of the current passes through a moving coil galvanometer of resistance 99 ohm, then the shunt resistance will be

Solution:
QUESTION: 76

A particle under the action of a constant force moves from rest upto 20 seconds. If distance covered in first 10 seconds is s₁ and that covered in next 10 seconds is s₂, then

Solution:
QUESTION: 77

Two simple pendulums of length 0.5 m and 20 m respectively are given small linear displacement in one direction at the same time. They will again be in the phase when the pendulum of shorter length has completed... oscillations

Solution:
QUESTION: 78

In the following question, a Statement-1 is given followed by a corresponding Statement-2 just below it. Read the statements carefully and mark the correct answer-
Statement-1:
If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.
Statement-2:
The linear momentum of an isolated system remains constant

Solution:
QUESTION: 79

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The principle of homogeneity of dimensions state that dimensions on both sides of equation must be same
Reason (R) : An equation which is dimensionally correct is also practically correct

Solution:
QUESTION: 80

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Two spherical conductors A and B having different potentials are separated by a long distance so that they can be considered as isolated. Then charge flown through the wire, to equilize the potentials of A and B as a result some current flows through connecting wire for some-time. During this time over Ampere's loop is zero.
Reason(R) : According to Ampere's circuital law, over any closed path is equal to the number of times the net current enclosed by the loop provided the electric field over the region of ampere's loop is remains constant.

Solution:
QUESTION: 81

The upper end of wire of radius 4 mm and length 100 cm is clamped and its other end is twisted through an angle an angle of 30º. Then angle of shear is

Solution:
QUESTION: 82

Motion of a liquid in a tube is described by

Solution:
QUESTION: 83

The distance between eye lens and cross wire in Ramsden eye piece which has a field lens of focal length 1.2 cm is .......cm.

Solution:
QUESTION: 84

A body having moment of inertia about its axis of rotation equal to 3 kg-m2 is rotating with angular velocity equal to 3 rad/s. Kinetic energy of this rotating body is the same as that of body of mass 27 kg moving with a speed of

Solution:
QUESTION: 85

When the potential energy of a particle executing simple harmonic motion is one-fourth of the maximum value during the oscillation, its displacement from the equilibrium position in terms of its amplitude a is

Solution:
QUESTION: 86

The internal energy of a gas, during isothermal expansion

Solution:
QUESTION: 87

An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy

Solution:
QUESTION: 88

If the ratio of the densities of two monoatomic gases is 16 : 9, the ratio of the velocities of sound in them is

Solution:
QUESTION: 89

Who gave the universal law of gravitation?

Solution:
QUESTION: 90

In Huygen's wave theory, the locus of all points oscillating in the same phase is called a

Solution: