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JEE Main Mock Test 3

90 Questions MCQ Test | JEE Main Mock Test 3

Description

This mock test of JEE Main Mock Test 3 for JEE helps you for every JEE entrance exam. This contains 90 Multiple Choice Questions for JEE JEE Main Mock Test 3 (mcq) to study with solutions a complete question bank. The solved questions answers in this JEE Main Mock Test 3 quiz give you a good mix of easy questions and tough questions. JEE students definitely take this JEE Main Mock Test 3 exercise for a better result in the exam. You can find other JEE Main Mock Test 3 extra questions, long questions & short questions for JEE on EduRev as well by searching above.

QUESTION: 1

The total length of a sonometer wire between fixed ends is 110 cm. Two bridges are placed to divide the length of wire in ratio 6 : 3 : 2. The tension in the wire is 400 N and the mass per unit length is 0.01 kg/m. What is the minimum common frequency with which three parts can vibrate?

A.
1100 Hz
B.
1000 Hz
C.
166 Hz
D.
100 Hz

Solution:

QUESTION: 2

Two factories are sounding their sirens at 800 Hz. A man goes from one factory to other at a speed of 2 m/s. The velocity of sound is 320 m/s. The number of beats heard by the person in one second will be

A.
8
B.
2
C.
10
D.
4

Solution:

QUESTION: 3

Interference pattern is observed at ‘P’ due to superimposition of two rays coming out from a source ‘S’ as shown in the figure. The value of l for which maxima is obtained at ‘P’ is ( R is perfect reflection surface):

A.
l =
B.
l =
C.
l =
D.
l =

Solution:

QUESTION: 4

Two bodies of masses 1 kg and 4 kg are connected to a vertical spring, as shown in the figure. The smaller mass executes simple harmonic motion of angular frequency 25 rad/s, and amplitude 1.6 cm while the bigger mass remains stationary on the ground. The maximum force exerted by the system on the floor is (take g = 10 ms^-2).

A.
20 N
B.
10 N
C.
60 N
D.
40 N

Solution:

QUESTION: 5

An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass M. The piston and cylinder have equal cross sectional area A. When the piston is in equilibrium, the volume of the gas is V₀ and its pressure is P₀. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency:

Solution:

QUESTION: 6

A pendulum made of a uniform wire of cross sectional area A has time period T. When an additional mass M is added to its bob, the time period changes to T_M. If the Young’s modulus of the material of the wire is Y then is equal to : (g-gravitational acceleration)

Solution:

QUESTION: 7

Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion the average time of collision between molecules increases as V^q, where V is the volume of the gas. The value of q is :

Solution:

QUESTION: 8

An ideal mono-atomic gas is confined in a cylinder by a spring loaded piston of cross section 0.8 × 10^-2m². Initially the gas is at 300 K and occupies a volume of 2.4 × 10^-3m³ and the spring is in its relaxed state as shown in figure. The gas is heated by a small heater until the piston moves out slowly by 0.1 m. The force constant of the spring is 8000 N/m and the atmospheric pressure is 1.0 × 10⁵ N/m². The cylinder and the piston are thermally insulated. The piston and the spring are massless and there is no friction between the piston and the cylinder. The final temperature of the gas will be ( Neglect the heat loss through the lead wires of the heater. The heat capacity of the heater coil is also negligible)

A.
1000 K
B.
500 K
C.
300 K
D.
800 K

Solution:

QUESTION: 9

The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

A.
1/2
B.
1/4
C.
1/3
D.
2/3

Solution:

QUESTION: 10

A black coloured solid sphere of radius R and mass M is inside a cavity with vacuum inside. The walls of the cavity are maintained at temperature T₀. The initial temperature of sphere is 3T₀. If the specific heat of the material of the sphere varies as αT³ with the temperature T of the sphere, where a is a constant, then the time taken for the sphere to cool down to temperature 2T₀ will be (σ is Stafan-Boltzmann constant )

Solution:

QUESTION: 11

A thin tube sealed at both ends is 100 cm long. It lies horizontally, the middle 20 cm containing mercury and two equal ends containing air at standard atmospheric pressure. If the tube is now turned to a vertical position, by what amount will the mercury be displaced? (Given: cross section of the tube can be assumed to be uniform)

A.
2.95 cm
B.
5.18 cm
C.
8.65 cm
D.
0.0 cm

Solution:

QUESTION: 12

A thin uniform annular disc (see figure) of mass M has outer radius 4R and inner radius 3R. The work required to take a unit mass from point P on its axis to infinity is

A.
B.
-
C.
D.

Solution:

QUESTION: 13

A small particle of mass m is projected at an angle θ with the x-axis with an initial velocity v₀ in the x-y plane as shown in the figure. At a time t < , the angular momentum of the particle is

A.
-
B.
C.
-
D.
-

Solution:

QUESTION: 14

Consider a cylinder of mass M resting on a rough horizontal rough that it pulled out from under it with acceleration ‘a’ perpendicular to the axis of cylinder. What is F_friction at point P? It is assumed that the cylinder does not slip.

A.
Mg
B.
Ma
C.
D.

Solution:

QUESTION: 15

A mass m moves with a velocity u and collides elastically with another identical mass at rest. After collision the first mass moves with celcity in a direction perpendicular to the initial direction of motion. Find the speed of the second mass after collision.

A.
v
B.
C.
D.

Solution:

QUESTION: 16

The acceleration experienced by a moving motor boat, after its engine is cut off, is given by .Where k is constant. If v₀ is the magnitude of velocity at cut-off, the magnitude of the velocity at a time t after the cut off is

A.
v₀ / 2
B.
v₀
C.
D.

Solution:

QUESTION: 17

The distance between the object and its doubly magnified real image by a concave mirror of focal length f is

A.
2f
B.
C.
D.
3f

Solution:

QUESTION: 18

The diameter of objective lens of microscope makes an angle β at the focus of the microscope. Further, the medium between the object and the lens is an oil of refractive index n. Then the resolving power of microscope.

A.
Increases with decreasing value of n
B.
Increases with decreasing value of β
C.
Increases with increasing value of n sin 2β
D.
Increases with increasing value of

Solution:

QUESTION: 19

In a Young’s double slit experiment, the distance between the two identical slits is 6.1 times larger than the slit width. Then the number of intensity maxima observed within the central maximum of the single slit diffraction pattern is:

A.
3
B.
6
C.
12
D.
24

Solution:

QUESTION: 20

An isolated sphere S of radius R carries an electric charge. S is momentarily connected to a distant uncharged sphere T which has a radius r. The ratio of surface charge density of S to that of T is

A.
B.
C.
D.
none of these

Solution:

QUESTION: 21

In post office box, the graph of galvanometer deflection versus resistance R ( pulled out of resistance box) for the ratio 100:1 is given as shown ( due to unsuitable values of R, galvanometer shows deflection).The two consecutive values of R are shown in the figure.The value of unknown resistance would be

A.
3.2 ?
B.
3.24 ?
C.
3.206 ?
D.
3.237 ?

Solution:

QUESTION: 22

A sphere encloses an electric dipole within it. The total flux across the sphere is

A.
Zero
B.
Half that due to a single charge
C.
Double that due to a single charge
D.
Dependent on the position of the dipole

Solution:

QUESTION: 23

The output of a 2 input NAND gate is fed to a NOT gate. The Truth table for the output of the combination for all possible input of A and B is

Solution:

QUESTION: 24

A zener diode is operating in its normal region i.e., the breakdown region for which the circuit diagram is as shown in the figure

Here, Take V_Z= 7V and R = 10 W. For potential difference equal to 8V across AB, what is the current through microammeter?

A.
1000 µA
B.
1 μA
C.
10 µA
D.
100 μA

Solution:

QUESTION: 25

Voltage with appreciable ripple expressed as V = V₁+V₂ cos wt is applied to a resistor R. The average amount of heat generated per second is

A.
B.
C.
D.
Depends on whether V₁ is greater than or less then V₂

Solution:

QUESTION: 26

What is the electric potential at the centre of the square?

A.
Zero
B.
C.
D.
None of these

Solution:

QUESTION: 27

An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to Q₀ and then connected to the L and R as shown.If a student plots graphs of the square of maximum charge Q²_max on the capacitor with time (t) for two different values L₁ and L₂ (L₁>L₂) of L then which of the following represents this graph correctly? (Plots are schematic and not drawn to scale)

Solution:

QUESTION: 28

In the given circuit, charge Q₂ on the 2µF capacitor changes as C is varied from 1µF to 3µF. Q₂ as a function of ‘C’ is given properly by:

Solution:

QUESTION: 29

An inductor (L=0.03H) and a resistor (R=0.15kW) are connected in series to a battery of 15V EMF in a circuit shown. The key K₁ has been kept closed for a long time. Then at t = 0, K₁ is opened and key K₂ is closed simultaneously. At t = 1 ms, the current in the circuit will be : (e⁵=150)

A.
67 mA
B.
6.7 mA
C.
0.67 mA
D.
100mA

Solution:

QUESTION: 30

An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity B, The magnetic field B_s inside the superconductor will be such that:

A.
B_s= –B
B.
B_s = 0
C.
B_s= B
D.
B_s< but S_s 0

Solution:

QUESTION: 31

A compound A and B are interconverting. Structures of A and B are shown below:

Which of the following statement is correct regarding the equililbrium constant of A B.

A.
K < 1
B.
K > 1
C.
K = 1
D.
Can’t predict

Solution:

QUESTION: 32

Which of the following species is highly acidic.

Solution:

QUESTION: 33

Which of the following statement is correct regarding the product of the following reaction?

A.
Only X and Y are formed
B.
Y > Z (amount)
C.
X > Y (amount)
D.
Z > X (amount)

Solution:

QUESTION: 34

A face centred cubic lattice is made up of hollow spheres of X. Spheres of solid Y are present in hollow sphere X. Radius of Y is half of radius of X. What is the ratio of total volume of spheres of X unoccupied by Y in a Unit-cell and volume of unit cell.

A.
(7piover 24sqrt 2)
B.
7sqrt 2piover 24
C.
(7piover 24sqrt 2)
D.
None of these

Solution:

QUESTION: 35

[HXeO₄]^- + OH^- → [A] +[B] + O₂ + H₂O.

The products in [A] and [B] in unbalanced reaction are:

A.
[XeO₆]⁴^- and Xe
B.
[XeO₆]^4– and XeO₃
C.
XeO₃ and Xe
D.
H₂XeO₄ and Xe

Solution:

QUESTION: 36

B(OH)₃ + NaOH Na[B(OH)₄] (aq)

Addition of compound X makes the reaction to proceed in forward direction, compound X is:

A.
Cis-1,2diol
B.
Trans 1,2 diol
C.
Borax
D.
Na₂HPO₄

Solution:

QUESTION: 37

During the transition of an electron from n = n level to n = 1 level in H (Hydrogen), D (Deuterium) and T (Tritium) if the wavelengths of emitted photons are λ_H, λ_D and λ_T. Then which of the following statement is correct?

A.
λ_H > λ_D > λ_T
B.
λ_T > λ_D > λ_H
C.
λ_H = λ_D = λ_T
D.
λ_H > λ_T > λ_D

Solution:

QUESTION: 38

Major product

Major product is:

Solution:

QUESTION: 39

Which of the following diatomic molecules would be stabilized by the removal of an electron?

A.
C₂
B.
CN
C.
N₂
D.
O₂

Solution:

QUESTION: 40

The approximate pH of a solution formed by mixing equal volumes of solution of 0.1 M sodium propanoate and 0.1 M propanoic acid (k_a for propanoic acid = 1.3 × 10^-5 mol dm^-3) will be:

A.
1.52
B.
3.62
C.
4.89
D.
5.52

Solution:

QUESTION: 41

A catalyst lowers the activation energy of a reaction from 20 kJ mole^–1 to 10 kJ mole^–1. The temperature at which the uncatalysed reaction will have the same rate as that of the catalysed at 27°C is

A.
–123°C
B.
327°C
C.
300°C
D.
+ 23°C

Solution:

QUESTION: 42

Mercurous ion (Hg₂²⁺) has magnetic moment of

A.
Zero
B.
1.732 BM
C.
2.89 BM
D.
5.92 BM

Solution:

QUESTION: 43

The velocity of electron in the second orbit of He⁺ will be

A.
2.18 × 10⁶ m/s
B.
1.09 × 10⁶ m/s
C.
4.36 × 10⁶ m/s
D.
None

Solution:

QUESTION: 44

Correct order of size of iodine species are:

A.
I^– > I > I⁺
B.
I > I^– > I⁺
C.
I > I⁺ > I^–
D.
I⁺ > I > I^–

Solution:

QUESTION: 45

20 ml of 0.2 M Al₂(SO₄)₃ is mixed with 20 ml of 0.6 M BaCl₂. Concentration of Al³⁺ ion in the solution will be

A.
0.2 M
B.
10.3 M
C.
0.1 M
D.
0.25 M

Solution:

QUESTION: 46

The circulation of blood in human body supplies O₂ and releases CO₂. the concentration of O₂ and CO₂ is variable but on an average, 100 ml blood contains 0.02 g of O₂ and 0.08 g of CO₂. The volume of O₂ and CO₂ at 1 atm and at body temperature 37^oC, assuming 10 lt blood in human body, is

A.
2 lt, 4 lt
B.
1.5 lt, 4.5 lt
C.
1.59 lt, 4.62 lt
D.
3.82 lt, 4.62 lt

Solution:

QUESTION: 47

A 3 mol sample of a gas having = 1.33 at 300 K is allowed to expand under reversible adiabatic condition from 5 L to 40 L. The value of H is

A.
–12.46 KJ
B.
–14.950 KJ
C.
– 24.62 KJ
D.
– 10.24 KJ

Solution:

QUESTION: 48

A.
B.
C.
D.
None of the above

Solution:

QUESTION: 49

Aqueous solution of a salt (Y) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. H₂SO₄ is added to a hot concentrated solution of (Y), white crystals of a weak acid separates out. Hence, the compound (Y) is

A.
Na₂SO₄.10H₂O
B.
Ca₂B₆O₁₁.10H₂O
C.
Na₂B₆O₁₁
D.
Na₂B₄O₇.10H₂O

Solution:

QUESTION: 50

A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow precipitate with a solution of KI. When a solution of barium chloride is added to a solution of powder, a white precipitate results. This white powder may be

A.
a soluble sulphate
B.
KBr or NaBr
C.
Ba(NO₃)₃
D.
AgNO₃

Solution:

QUESTION: 51

Which nitrogen in the following compound has least pK_b value?

A.
I
B.
II
C.
III
D.
All have equal pK_b value

Solution:

QUESTION: 52

The slag obtained during the extraction of copper pyrites is composed mainly of

A.
Cu₂S
B.
FeSiO₃
C.
CuSiO₃
D.
SiO₂

Solution:

QUESTION: 53

Which of the following is an example of basic dye?

A.
Alizarine
B.
Indigo
C.
Malachite
D.
Orange – I

Solution:

QUESTION: 54

Which of the following is a natural fibre?

A.
Starch
B.
Cellulose
C.
Rubber
D.
Nylon-6

Solution:

QUESTION: 55

The product (B) in the above sequence of reaction is

Solution:

QUESTION: 56

Chlorination of toluene in presence of light and heat followed by treatment with aqueous NaOH gives

A.
o-cresol
B.
p-cresol
C.
2,4-dihydroxy toluene
D.
benzoic acid

Solution:

QUESTION: 57

'P' as a major product must be,

Solution:

QUESTION: 58

The reaction A Product, is zero order while the reaction B Product, is first order reaction. For what initial concentration of A are the half lives of the two reactions equal? (Rate constant value are same for both two reaction).

A.
(log_e 4) M
B.
2 M
C.
log 2 M
D.
ln 2 M

Solution:

QUESTION: 59

Two substances A and B are present such that [A₀] = 4[B₀] and half-life of A is 5 minutes and that of B is 15 minutes. If they start decaying at the same time following first order kinetics how much time later will the concentration of both of them would be same?

A.
15 minutes
B.
10 minutes
C.
5 minutes
D.
12 minutes

Solution:

QUESTION: 60

40% of a mixture of 0.2 mol of N₂ and 0.6 mol of H₂ react to give NH₃ according to the equation,N₂(g) + 3H₂(g) → 2NH₃(g), at constant temperature and pressure. Then the ratio of the final volume to the initial volume of gases are

A.
4:5
B.
5:4
C.
7:10
D.
8:5

Solution:

QUESTION: 61

Equation of the bisector of the acute angle between lines 3x + 4y + 5 = 0 and 12x – 5y – 7 = 0 is

A.
21x + 77y + 100 = 0
B.
99x – 27y + 30 = 0
C.
99x + 27y + 30 = 0
D.
21x – 77y – 100 = 0

Solution:

QUESTION: 62

If α and β are the roots of the equation x²- 2x + 4 = 0, then the value of αⁿ + βⁿ will be

A.
i2ⁿ⁺¹ sin (n/3)
B.
2ⁿ⁺¹ cos (n/3)
C.
i2^n-1 sin (n/3)
D.
2^n-1 cos (n/3)

Solution:

QUESTION: 63

If A = and I = , then the correct statement is

A.
A² + 5A - 7I = 0
B.
-A² + 5A + 7I = 0
C.
A² - 5A + 7I = 0
D.
A² + 5A + 7I = 0

Solution:

QUESTION: 64

The value of the determinant will be

A.
(a - b - c) (a² + b² + c²)
B.
(a + b + c)³
C.
(a + b + c) (ab + bc + ca)
D.
None of the above

Solution:

QUESTION: 65

If AM and HM between two numbers are 27 and 12 respectively, then their GM is

A.
9
B.
18
C.
24
D.
36

Solution:

QUESTION: 66

A bag contains 3 white and 5 black balls. One ball is drawn at random. Then, the probability that it is white, is

Solution:

QUESTION: 67

a. (b × c) = 0, then the correct statement is

A.
out of a, b, c any two vectors are parallel
B.
a, b, c are coplanar
C.
any two of a,b,c are equal
D.
at least one of the above statement is correct

Solution:

QUESTION: 68

If , then is equal to

A.
f (1) - f (2)
B.
C.
f (2) - f (1)
D.

Solution:

QUESTION: 69

dx is equal to

A.
0
B.
1
C.
D.

Solution:

QUESTION: 70

The function sin x + cos x is maximum when x is equal to

Solution:

QUESTION: 71

is equal to

A.
x^x log (e/x)
B.
x^x log (ex)
C.
log (ex)
D.
x^x log (x)

Solution:

QUESTION: 72

The set A={ x : x ε R, x² = 16 and 2x = 6 } equals

A.
B.
{14, 3, 4}
C.
{3}
D.
{4}

Solution:

QUESTION: 73

In how many ways can 5 prizes be distributed among four students when every student can take one or more prizes?

A.
1024
B.
625
C.
120
D.
600

Solution:

QUESTION: 74

The value of 7 log + 5 log + 3 log is equal to

A.
log 2
B.
3
C.
5
D.
7

Solution:

QUESTION: 75

The value of is

A.
e
B.
2e
C.
3e
D.
None of these

Solution:

QUESTION: 76

If the domain of the function f (x) = x² - 6x + 7 is (-∞ , ∞) , then the range of function is

A.
(-∞ , ∞)
B.
[-2 , ∞)
C.
(-2 , 3)
D.
(-∞ , -2)

Solution:

QUESTION: 77

is equal to

A.
1
B.
-1
C.
D.
-

Solution:

QUESTION: 78

In order that the function f (x) = (x + 1)^1/x is continuous at x = 0,f (0) must be defined as

A.
f (0) = 0
B.
f (0) = e
C.
f (0) =
D.
f (0) = 1

Solution:

QUESTION: 79

The function f (x) = |x| at x = 0 is

A.
continuous but non-differentiable
B.
Discontinuous and differentiable
C.
discontinuous and non-differentiable
D.
continuous and differentiable

Solution:

QUESTION: 80

The function f (x) = x^1/x is

A.
increasing in (1, ∞)
B.
decreasing in (1, ∞)
C.
increasing in (1,e), decreasing in (e, ∞)
D.
decreasing in (1,e), increasing in (e, ∞)

Solution:

QUESTION: 81

The order and degree of the differential equation are

A.
1 and
B.
2 and 1
C.
1 and 1
D.
1 and 2

Solution:

QUESTION: 82

The line x + y = 4 divides the line joining the points (-1,1) and (5,7) in the ratio

A.
2 : 1
B.
1 : 2
C.
1 : 2 externally
D.
None of these

Solution:

QUESTION: 83

The angle between the pair of lines given by equation x²+ 2xy – y²= 0, is

A.
B.
C.
D.
0

Solution:

QUESTION: 84

The length of tangent from point (5,1) to the circle x² + y² + 6x - 4y -3 = 0 is

A.
81
B.
29
C.
7
D.
21

Solution:

QUESTION: 85

The radius of the director circle of the hyperbola is

A.
a - b
B.
C.
D.

Solution:

QUESTION: 86

If projection of any line on coordinate axes are 3, 4 and 5, then its length is

A.
12
B.
50
C.
D.

Solution:

QUESTION: 87

If tanθ = (1/2) and tan = (1/3) ,then the value of θ + is

A.
B.
C.
0
D.

Solution:

QUESTION: 88

The principle value of is

A.
-
B.
-
C.
D.

Solution:

QUESTION: 89

A ladder rests against a wall so that its top touches the roof of the house. If the ladder makes an angle of 60° with the horizontal and height of the house be , then the length of the ladder is