NTA JEE Main 24th February 2021 Shift 1

NTA JEE Main 24th February 2021 Shift 1 - Question 1

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The work done by a gas molecule in an isolated system is given by, $$W = \alpha \beta^2 e^{-\frac{x^2}{\alpha k T}}$$, where $$x$$ is the displacement, $$k$$ is the Boltzmann constant and $$T$$ is the temperature. $$\alpha$$ and $$\beta$$ are constants. Then the dimensions of $$\beta$$ will be:

A

$$M^2 L T^2$$

B

$$ML^2 T^{-2}$$

C

$$MLT^{-2}$$

D

$$M^0 L T^0$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 2

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If the velocity-time graph has the shape AMB, what would be the shape of the corresponding acceleration-time graph?

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 3

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Moment of inertia M.I. of four bodies, having same mass and radius, are reported as;
$$I_1$$ = M.I. of thin circular ring about its diameter,
$$I_2$$ = M.I. of circular disc about an axis perpendicular to disc and going through the centre,
$$I_3$$ = M.I. of solid cylinder about its axis and
$$I_4$$ = M.I. of solid sphere about its diameter.
Then:

A

$$I_1 + I_2 = I_3 + \frac{5}{2}I_4$$

B

$$I_1 + I_3 < I_2 + I_4$$

C

$$I_1 = I_2 = I_3 > I_4$$

D

$$I_1 = I_2 = I_3 < I_4$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 4

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Consider two satellites $$S_1$$ and $$S_2$$ with periods of revolution 1hr and 8hr respectively revolving around a planet in circular orbits. The ratio of angular velocity of satellite $$S_1$$ to the angular velocity of satellite $$S_2$$ is:

A

8 : 1

B

2 : 1

C

1 : 4

D

1 : 8

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NTA JEE Main 24th February 2021 Shift 1 - Question 5

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Four identical particles of equal mass of 1 kg are made to move along the circumference of a circle of radius 1 m under the action of their own mutual gravitational attraction. The speed of each particle will be:

A

$$\sqrt{G(1 + 2\sqrt{2})}$$

B

$$\dfrac{1}{2} \sqrt{G(1 + 2\sqrt{2})}$$

C

$$\dfrac{1}{2} \sqrt{G(2\sqrt{2} - 1)}$$

D

$$\sqrt{\dfrac{G(1 + 2\sqrt{2})}{4}}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 6

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Two stars of masses $$m$$ and $$2m$$ at a distance $$d$$ rotate about their common centre of mass in free space. The period of revolution is:

A

$$2\pi\sqrt{\frac{d^3}{3Gm}}$$

B

$$2\pi\sqrt{\frac{3Gm}{d^3}}$$

C

$$\frac{1}{2\pi}\sqrt{\frac{3Gm}{d^3}}$$

D

$$\frac{1}{2\pi}\sqrt{\frac{d^3}{3Gm}}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 7

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If $$Y$$, $$K$$ and $$\eta$$ are the values of Young's modulus, bulk modulus and modulus of rigidity of any material respectively. Choose the correct relation for these parameters.

A

$$Y = \frac{9K\eta}{3K - \eta}$$ N m$$^{-2}$$

B

$$\eta = \frac{3YK}{9K + Y}$$ N m$$^{-2}$$

C

$$K = \frac{Y\eta}{9\eta - 3Y}$$ N m$$^{-2}$$

D

$$Y = \frac{9K\eta}{2\eta + 3K}$$ N m$$^{-2}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 8

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Each side of a box made of metal sheet in cubic shape is $$a$$ at room temperature $$T$$, the coefficient of linear expansion of the metal sheet is $$\alpha$$. The metal sheet is heated uniformly, by a small temperature $$\Delta T$$, so that its new temperature is $$T + \Delta T$$. Calculate the increase in the volume of the metal box.

A

$$4a^3 \alpha \Delta T$$

B

$$3a^3 \alpha \Delta T$$

C

$$4\pi a^3 \alpha \Delta T$$

D

$$\frac{4}{3}\pi a^3 \alpha \Delta T$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 9

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Match List I with List II.

List I	List II
(a) Isothermal	(i) Pressure constant
(b) Isochoric	(ii) Temperature constant
(c) Adiabatic	(iii) Volume constant
(d) Isobaric	(iv) Heat content is constant

Choose the correct answer from the options given below:

A

(a)→(ii), (b)→(iii), (c)→(iv), (d)→(i)

B

(a)→(iii), (b)→(ii), (c)→(i), (d)→(iv)

C

(a)→(i), (b)→(iii), (c)→(ii), (d)→(iv)

D

(a)→(ii), (b)→(iv), (c)→(iii), (d)→(i)

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NTA JEE Main 24th February 2021 Shift 1 - Question 10

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$$n$$ mole of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes.
$$A \to B$$: Isothermal expansion at temperature $$T$$ so that the volume is doubled from $$V_1$$ to $$V_2 = 2V_1$$ and pressure changes from $$P_1$$ to $$P_2$$
$$B \to C$$: Isobaric compression at pressure $$P_2$$ to initial volume $$V_1$$.
$$C \to A$$: Isochoric change leading to change of pressure from $$P_2$$ to $$P_1$$
Total work done in the complete cycle ABCA is:

A

$$nRT\ln 2 - \frac{1}{2}$$

B

$$nRT\ln 2$$

C

$$nRT\ln 2 + \frac{1}{2}$$

D

0

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NTA JEE Main 24th February 2021 Shift 1 - Question 11

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In the given figure, a mass $$M$$ is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is $$k$$. The mass oscillates on a frictionless surface with time period $$T$$ and amplitude $$A$$. When the mass is in equilibrium position, as shown in the figure, another mass $$m$$ is gently fixed upon it. The new amplitude of oscillation will be:

A

$$A\sqrt{\frac{M+m}{M}}$$

B

$$A\sqrt{\frac{M}{M-m}}$$

C

$$A\sqrt{\frac{M-m}{M}}$$

D

$$A\sqrt{\frac{M}{M+m}}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 12

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A cube of side $$a$$ has point charges +Q located at each of its vertices except at the origin where the charge is -Q. The electric field at the centre of cube is: 

A

$$\frac{-Q}{3\sqrt{3}\pi\varepsilon_0 a^2}(\hat{x} + \hat{y} + \hat{z})$$

B

$$\frac{Q}{3\sqrt{3}\pi\varepsilon_0 a^2}(\hat{x} + \hat{y} + \hat{z})$$

C

$$\frac{2Q}{3\sqrt{3}\pi\varepsilon_0 a^2}(\hat{x} + \hat{y} + \hat{z})$$

D

$$\frac{-2Q}{3\sqrt{3}\pi\varepsilon_0 a^2}(\hat{x} + \hat{y} + \hat{z})$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 13

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Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be:

A

1 : 2

B

1 : 4

C

4 : 1

D

2 : 1

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NTA JEE Main 24th February 2021 Shift 1 - Question 14

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A current through a wire depends on time as $$i = \alpha_0 t + \beta t^2$$, where $$\alpha_0 = 20$$ A s$$^{-1}$$ and $$\beta = 8$$ A s$$^{-2}$$. Find the charge crossed through a section of the wire in 15 s.

A

2250 C

B

11250 C

C

2100 C

D

260 C

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NTA JEE Main 24th February 2021 Shift 1 - Question 15

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A cell $$E_1$$ of emf 6 V and internal resistance 2$$\Omega$$ is connected with another cell $$E_2$$ of emf 4 V and internal resistance 8 $$\Omega$$ (as shown in the figure). The potential difference across points X and Y is:

A

10.0 V

B

5.6 V

C

2.0 V

D

3.6 V

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NTA JEE Main 24th February 2021 Shift 1 - Question 16

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The focal length $$f$$ is related to the radius of curvature $$r$$ of the spherical convex mirror by:

A

$$f = -\frac{1}{2}r$$

B

$$f = +\frac{1}{2}r$$

C

$$f = r$$

D

$$f = -r$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 17

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In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.

A

1 : 4

B

2 : 1

C

3 : 1

D

4 : 1

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NTA JEE Main 24th February 2021 Shift 1 - Question 18

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Given below are two statements:
Statement I: Two photons having equal linear momenta have equal wavelengths.
Statement II: If the wavelength of the photon is decreased, then the momentum and energy of a photon will also decrease.
In the light of the above statements, choose the correct answer from the options given below.

A

Both Statement I and Statement II are false

B

Both Statement I and Statement II are true

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

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NTA JEE Main 24th February 2021 Shift 1 - Question 19

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In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked A, B, C, D and E. The transitions A, B and C respectively represent

A

The ionization potential of hydrogen, second member of Balmer series and third member of Paschen series.

B

The series limit of Lyman series, second member of Balmer series and second member of Paschen series.

C

The series limit of Lyman series, third member of Balmer series and second member of Paschen series.

D

The first member of the Lyman series, third member of Balmer series and second member of Paschen series.

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NTA JEE Main 24th February 2021 Shift 1 - Question 20

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If an emitter current is changed by 4 mA, the collector current changes by 3.5 mA. The value of $$\beta$$ will be:

A

3.5

B

0.5

C

0.875

D

7

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NTA JEE Main 24th February 2021 Shift 1 - Question 21

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The coefficient of static friction between a wooden block of mass 0.5 kg and a vertical rough wall is 0.2. The magnitude of the horizontal force that should be applied on the block to keep it adhere to the wall will be ______ N. $$g = 10$$ m s$$^{-2}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 22

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An inclined plane is bent in such a way that the vertical cross-section is given by $$y = \frac{x^2}{4}$$ where $$y$$ is in vertical and $$x$$ in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction $$\mu = 0.5$$, the maximum height in cm at which a stationary block will not slip downward is ______ cm.

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NTA JEE Main 24th February 2021 Shift 1 - Question 23

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A ball with a speed of 9 m s$$^{-1}$$ collides with another identical ball at rest. After the collision, the direction of each ball makes an angle of 30° with the original direction. If the ratio of the velocities of the balls after the collision is $$x : y$$, then what is the value of $$x$$?

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NTA JEE Main 24th February 2021 Shift 1 - Question 24

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A hydraulic press can lift 100 kg when a mass $$m$$ is placed on the smaller piston. It can lift ______ kg when the diameter of the larger piston is increased by 4 times and that of the smaller piston is decreased by 4 times keeping the same mass $$m$$ on the smaller piston.

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NTA JEE Main 24th February 2021 Shift 1 - Question 25

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A common transistor radio set requires 12 V D.C. for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V A.C. on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ______

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NTA JEE Main 24th February 2021 Shift 1 - Question 26

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A resonance circuit having inductance $$2 \times 10^{-4}$$ H and resistance 6.28 $$\Omega$$ respectively oscillates at 10 MHz frequency. The value of quality factor of this resonator is ______. $$\pi = 3.14$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 27

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An electromagnetic wave of frequency 5GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in this medium is ______ $$\times 10^7$$ m s$$^{-1}$$.

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NTA JEE Main 24th February 2021 Shift 1 - Question 28

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An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30° in clockwise direction, the intensity of emerging light will be ______ Lumens.

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NTA JEE Main 24th February 2021 Shift 1 - Question 29

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In connection with the circuit drawn below, the value of current flowing through 2 k$$\Omega$$ resistor is ______ $$\times 10^{-4}$$ A.

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NTA JEE Main 24th February 2021 Shift 1 - Question 30

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An audio signal $$v_m = 20\sin 2\pi \times 1500t$$ amplitude modulates a carrier $$v_c = 80\sin 2\pi \times 100000t$$. The value of percent modulation is ______

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NTA JEE Main 24th February 2021 Shift 1 - Question 31

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Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionisation enthalpy is:

A

Al < Mg < Si < S < P

B

Al < Mg < S < Si < P

C

Mg < Al < Si < P < S

D

Mg < Al < Si < S < P

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NTA JEE Main 24th February 2021 Shift 1 - Question 32

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Which of the following are isostructural pairs?
A. $$SO_4^{2-}$$ and $$CrO_4^{2-}$$
B. $$SiCl_4$$ and $$TiCl_4$$
C. $$NH_3$$ and $$NO_3^-$$
D. $$BCl_3$$ and $$BrCl_3$$

A

A and C only

B

B and C only

C

A and B only

D

C and D only

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NTA JEE Main 24th February 2021 Shift 1 - Question 33

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(A) $$HOCl + H_2O_2 \to H_3O^+ + Cl^- + O_2$$
(B) $$I_2 + H_2O_2 + 2OH^- \to 2I^- + 2H_2O + O_2$$
Choose the correct option.

A

$$H_2O_2$$ act as oxidizing and reducing agent respectively in equations (A) and (B).

B

$$H_2O_2$$ acts as oxidising agent in equations (A) and (B).

C

$$H_2O_2$$ acts as reducing and oxidising agent respectively in equations (A) and (B).

D

$$H_2O_2$$ acts as reducing agent in equations (A) and (B).

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NTA JEE Main 24th February 2021 Shift 1 - Question 34

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$$Al_2O_3$$ was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are

A

$$X = AlOH_3, Y = CO_2, Z = Al_2O_3$$

B

$$X = NaAlOH_4, Y = SO_2, Z = Al_2O_3$$

C

$$X = AlOH_3, Y = SO_2, Z = Al_2O_3 \cdot xH_2O$$

D

$$X = NaAlOH_4, Y = CO_2, Z = Al_2O_3, xH_2O$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 35

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Identify products A and B.

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 36

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Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. $$H_2SO_4$$ followed by treatment with NaOH?

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 37

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In the following reaction, the reason why meta-nitro product also formed is:

A

Formation of anilinium ion

B

$$-NH_2$$ group is highly meta-directive

C

$$-NO_2$$ substitution always takes place at meta-position

D

Low temperature

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NTA JEE Main 24th February 2021 Shift 1 - Question 38

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The gas released during anaerobic degradation of vegetation may lead to:

A

Corrosion of metals

B

Ozone hole

C

Global warming and cancer

D

Acid rain

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NTA JEE Main 24th February 2021 Shift 1 - Question 39

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In Freundlich adsorption isotherm, slope of AB line is:

A

$$\frac{1}{n}$$ with $$\frac{1}{n} = 0$$ to $$1$$

B

$$n$$ with $$n = 0.1$$ to $$0.5$$

C

$$\log \frac{1}{n}$$ with $$n < 1$$

D

$$\log n$$ with $$n > 1$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 40

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Which of the following ore is concentrated using group 1 cyanide salt?

A

Malachite

B

Calamine

C

Siderite

D

Sphalerite

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NTA JEE Main 24th February 2021 Shift 1 - Question 41

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The major components in "Gun Metal" are:

A

Cu, Sn and Zn

B

Al, Cu, Mg and Mn

C

Cu, Ni and Fe

D

Cu, Zn and Ni

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NTA JEE Main 24th February 2021 Shift 1 - Question 42

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The electrode potential of $$M^{2+}/M$$ of 3d-series elements shows positive value for?

A

Co

B

Fe

C

Zn

D

Cu

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NTA JEE Main 24th February 2021 Shift 1 - Question 43

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The product formed in the first step of the reaction with excess Mg / Et$$_2$$O / Et = $$C_2H_5$$ is

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 44

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What is the major product formed by HI on reaction with the above compound?

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 45

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What is the final product (major) 'A' in the given reaction?

Major product among the following is?

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 46

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Which of the following reagent is used for the following reaction?
$$CH_3CH_2CH_3 \to CH_3CH_2CHO$$

A

Copper at high temperature and pressure

B

Manganese acetate

C

Molybdenum oxide

D

Potassium permanganate

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NTA JEE Main 24th February 2021 Shift 1 - Question 47

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A and B in the following reactions are:

A

B

C

D

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NTA JEE Main 24th February 2021 Shift 1 - Question 48

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Match List I with List II.

List I (Monomer Unit)	List II (Polymer)
(a) Caprolactum	(i) Natural rubber
(b) 2-Chloro-1,3-butadiene	(ii) Buna-N
(c) Isoprene	(iii) Nylon 6
(d) Acrylonitrile	(iv) Neoprene

Choose the correct answer from the options given below:

A

a→iii, b→iv, c→i, d→ii

B

a→i, b→ii, c→iii, d→iv

C

a→ii, b→i, c→iv, d→iii

D

a→iv, b→iii, c→ii, d→i

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NTA JEE Main 24th February 2021 Shift 1 - Question 49

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Given below are two statements:
Statement I: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.
Statement II: Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
In the light of the above statements, choose the most appropriate answer from the options given below.

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are false

C

Both Statement I and Statement II are true

D

Statement I is true but Statement II is false

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NTA JEE Main 24th February 2021 Shift 1 - Question 50

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Out of the following, which type of interaction is responsible for the stabilisation of $$\alpha$$-helix structure of proteins?

A

Covalent bonding

B

Ionic bonding

C

Hydrogen bonding

D

vander Waals forces

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NTA JEE Main 24th February 2021 Shift 1 - Question 51

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4.5 g of compound A (M.W. = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is $$x \times 10^{-1}$$. The value of $$x$$ is ______ (Rounded off to the nearest integer)

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NTA JEE Main 24th February 2021 Shift 1 - Question 52

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A proton and a $$Li^{3+}$$ nucleus are accelerated by the same potential. If $$\lambda_{Li}$$ and $$\lambda_p$$ denote the de Broglie wavelengths of $$Li^{3+}$$ and proton respectively, then the value of $$\frac{\lambda_{Li}}{\lambda_p}$$ is $$x \times 10^{-1}$$. The value of $$x$$ is ______ (Rounded off to the nearest integer) [Mass of $$Li^{3+}$$ = 8.3 mass of proton]

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NTA JEE Main 24th February 2021 Shift 1 - Question 53

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For the reaction $$A_g \to B_g$$, the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of $$\Delta G^o$$ for the reaction at 300 K and 1 atm in J mol$$^{-1}$$ is $$-xR$$, where $$x$$ is ______ (Rounded off to the nearest integer) R = 8.31 J mol$$^{-1}$$ K$$^{-1}$$ and ln10 = 2.3

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NTA JEE Main 24th February 2021 Shift 1 - Question 54

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The stepwise formation of $$[Cu(NH_3)_4]^{2+}$$ is given below:
$$Cu^{2+} + NH_3 \xrightleftharpoons{K_1} [Cu(NH_3)]^{2+}$$ 
$$[Cu(NH_3)]^{2+} + NH_3 \xrightleftharpoons{K_2} [Cu(NH_3)_2]^{2+}$$
$$[Cu(NH_3)_2]^{2+} + NH_3 \xrightleftharpoons{K_3} [Cu(NH_3)_3]^{2+}$$
$$[Cu(NH_3)_3]^{2+} + NH_3 \xrightleftharpoons{K_4} [Cu(NH_3)_4]^{2+}$$
The value of stability constants $$K_1$$, $$K_2$$, $$K_3$$ and $$K_4$$ are $$10^4$$, $$1.58 \times 10^3$$, $$5 \times 10^2$$ and $$10^2$$ respectively. The overall equilibrium constant for dissociation of $$[Cu(NH_3)_4]^{2+}$$ is $$x \times 10^{-12}$$. The value of $$x$$ is ______ (Rounded off to the nearest integer)

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NTA JEE Main 24th February 2021 Shift 1 - Question 55

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At 1990 K and 1 atm pressure, there are equal number of $$Cl_2$$ molecules and Cl atoms in the reaction mixture. The value of $$K_p$$ for the reaction $$Cl_{2g} = 2Cl_g$$ under the above conditions is $$x \times 10^{-1}$$. The value of $$x$$ is ______ (Rounded off to the nearest integer)

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NTA JEE Main 24th February 2021 Shift 1 - Question 56

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The reaction of sulphur in alkaline medium is given below:
$$S_{8s} + a \; OH^-_{aq} \to b \; S^{2-}_{aq} + c \; S_2O^{2-}_{3aq} + d \; H_2O_l$$
The values of 'a' is ______ (Integer answer)

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NTA JEE Main 24th February 2021 Shift 1 - Question 57

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Number of amphoteric compounds among the following is ______
(A) BeO
(B) BaO
(C) $$BeOH_2$$
(D) $$Sr(OH)_2$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 58

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The coordination number of an atom in a body-centered cubic structure is ______
[Assume that the lattice is made up of atoms.]

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NTA JEE Main 24th February 2021 Shift 1 - Question 59

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When 9.45 g of $$ClCH_2COOH$$ is added to 500 mL of water, its freezing point drops by 0.5°C. The dissociation constant of $$ClCH_2COOH$$ is $$x \times 10^{-3}$$. The value of $$x$$ is ______ (off to the nearest integer)
$$K_{f_{H_2O}} = 1.86$$ K kg mol$$^{-1}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 60

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Gaseous cyclobutene isomerizes to butadiene in a first order process which has a 'K' value of $$3.3 \times 10^{-4}$$ s$$^{-1}$$ at 153°C. The time in minutes it takes for the isomerization to proceed 40% to completion at this temperature is ______ (Rounded off to the nearest integer)

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NTA JEE Main 24th February 2021 Shift 1 - Question 61

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Let $$p$$ and $$q$$ be two numbers such that $$p + q = 2$$ and $$p^4 + q^4 = 272$$. Then $$p$$ and $$q$$ are roots of the equation:

A

$$x^2 - 2x + 2 = 0$$

B

$$x^2 - 2x + 8 = 0$$

C

$$x^2 - 2x + 136 = 0$$

D

$$x^2 - 2x + 16 = 0$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 62

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A scientific committee is to be formed from 6 Indians and 8 foreigners, which includes at least 2 Indians and double the number of foreigners as Indians. Then the number of ways, the committee can be formed, is:

A

1050

B

1625

C

575

D

560

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NTA JEE Main 24th February 2021 Shift 1 - Question 63

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If $$e^{(\cos^2 x + \cos^4 x + \cos^6 x + \ldots) \infty \log_e 2}$$ satisfies the equation $$t^2 - 9t + 8 = 0$$, then the value of $$\frac{2\sin x}{\sin x + \sqrt{3}\cos x}$$, where $$0 < x < \frac{\pi}{2}$$, is equal to

A

$$\frac{3}{2}$$

B

$$\frac{1}{2}$$

C

$$\sqrt{3}$$

D

$$2\sqrt{3}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 64

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A man is walking on a straight line. The arithmetic mean of the reciprocals of the intercepts of this line on the coordinate axes is $$\frac{1}{4}$$. Three stones A, B and C are placed at the points (1, 1), (2, 2) and (4, 4) respectively. Then which of these stones is/are on the path of the man?

A

C only

B

All the three

C

B only

D

A only

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NTA JEE Main 24th February 2021 Shift 1 - Question 65

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The value of $$-{}^{15}C_1 + 2 \cdot {}^{15}C_2 - 3 \cdot {}^{15}C_3 + \ldots - 15 \cdot {}^{15}C_{15} + {}^{14}C_1 + {}^{14}C_3 + {}^{14}C_5 + \ldots + {}^{14}C_{11}$$ is equal to

A

$$2^{14}$$

B

$$2^{13} - 13$$

C

$$2^{16} - 1$$

D

$$2^{13} - 14$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 66

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The locus of the mid-point of the line segment joining the focus of the parabola $$y^2 = 4ax$$ to a moving point of the parabola, is another parabola whose directrix is:

A

$$x = a$$

B

$$x = 0$$

C

$$x = -\frac{a}{2}$$

D

$$x = \frac{a}{2}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 67

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The statement among the following that is a tautology is:

A

$$A \lor A \land B$$

B

$$A \land A \lor B$$

C

$$B \to A \land A \to B$$

D

$$A \land A \to B \to B$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 68

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Two vertical poles are 150 m apart and the height of one is three times that of the other. If from the middle point of the line joining their feet, an observer finds the angles of elevation of their tops to be complementary, then the height of the shorter pole (in meters) is:

A

25

B

30

C

$$20\sqrt{3}$$

D

$$25\sqrt{3}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 69

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The system of linear equations
$$3x - 2y - kz = 10$$
$$2x - 4y - 2z = 6$$
$$x + 2y - z = 5m$$
is inconsistent if:

A

$$k = 3, m \neq \frac{4}{5}$$

B

$$k = 3, m = \frac{4}{5}$$

C

$$k \neq 3, m \in R$$

D

$$k \neq 3, m \neq \frac{4}{5}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 70

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Let $$f: R \to R$$ be defined as $$f(x) = 2x - 1$$ and $$g: R - \{1\} \to R$$. be defined as $$g(x) = \frac{x - \frac{1}{2}}{x - 1}$$. Then the composition function $$f(g(x))$$ is:

A

neither one-one nor onto

B

one-one but not onto

C

onto but not one-one

D

both one-one and onto

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NTA JEE Main 24th February 2021 Shift 1 - Question 71

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If $$f: R \to R$$ is a function defined by $$f(x) = x - 1\cos\frac{2x-1}{2}\pi$$, where $$[\cdot]$$ denotes the greatest integer function, then $$f$$ is:

A

discontinuous only at $$x = 1$$

B

discontinuous at all integral values of $$x$$ except at $$x = 1$$

C

continuous only at $$x = 1$$

D

continuous for every real $$x$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 72

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The function $$f(x) = \frac{4x^3 - 3x^2}{6} - 2\sin x + (2x - 1)\cos x$$:

A

increases in $$\left(\frac{1}{2}, \infty\right)$$

B

decreases in $$\left(-\infty, \frac{1}{2}\right)$$

C

decreases in $$\left(\frac{1}{2}, \infty\right)$$

D

increases in $$\left(-\infty, \frac{1}{2}\right)$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 73

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If the tangent to the curve $$y = x^3$$ at the point $$P(t, t^3)$$ meets the curve again at $$Q$$, then the ordinate of the point which divides $$PQ$$ internally in the ratio 1 : 2 is:

A

0

B

$$-2t^3$$

C

$$-t^3$$

D

$$2t^3$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 74

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If $$\int \frac{\cos x - \sin x}{\sqrt{8 - \sin 2x}} dx = a\sin^{-1}\frac{\sin x + \cos x}{b} + c$$, where $$c$$ is a constant of integration, then the ordered pair $$(a, b)$$ is equal to:

A

(1, -3)

B

(3, 1)

C

(-1, 3)

D

(1, 3)

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NTA JEE Main 24th February 2021 Shift 1 - Question 75

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$$\lim_{x \to 0} \frac{\int_0^{x^2} \sin\sqrt{ t} \, dt}{x^3}$$ is equal to:

A

0

B

$$\frac{2}{3}$$

C

$$\frac{3}{2}$$

D

$$\frac{1}{15}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 76

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The area (in sq. units) of the part of the circle $$x^2 + y^2 = 36$$, which is outside the parabola $$y^2 = 9x$$, is equal to

A

$$12\pi + 3\sqrt{3}$$

B

$$24\pi + 3\sqrt{3}$$

C

$$24\pi - 3\sqrt{3}$$

D

$$12\pi - 3\sqrt{3}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 77

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The population $$P = P(t)$$ at time $$t$$ of a certain species follows the differential equation $$\frac{dP}{dt} = 0.5P - 450$$. If $$P(0) = 850$$, then the time at which population becomes zero is:

A

$$\log_e 9$$

B

$$2\log_e 18$$

C

$$\log_e 18$$

D

$$\frac{1}{2}\log_e 18$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 78

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The distance of the point (1, 1, 9) from the point of intersection of the line $$\frac{x - 3}{1} = \frac{y - 4}{2} = \frac{z - 5}{2}$$ and the plane $$x + y + z = 17$$ is:

A

$$19\sqrt{2}$$

B

$$2\sqrt{19}$$

C

$$\sqrt{38}$$

D

38

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NTA JEE Main 24th February 2021 Shift 1 - Question 79

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The equation of the plane passing through the point (1, 2, -3) and perpendicular to the planes $$3x + y - 2z = 5$$ and $$2x - 5y - z = 7$$, is

A

$$11x + y + 17z + 38 = 0$$

B

$$3x - 10y - 2z + 11 = 0$$

C

$$6x - 5y + 2z + 10 = 0$$

D

$$6x - 5y - 2z - 2 = 0$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 80

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An ordinary dice is rolled for a certain number of times. If the probability of getting an odd number 2 times is equal to the probability of getting an even number 3 times, then the probability of getting an odd number for odd number of times is:

A

$$\frac{1}{32}$$

B

$$\frac{5}{16}$$

C

$$\frac{3}{16}$$

D

$$\frac{1}{2}$$

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NTA JEE Main 24th February 2021 Shift 1 - Question 81

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If the least and the largest real values of $$\alpha$$, for which the equation $$z + \alpha|z - 1| + 2i = 0$$ ($$z \in C$$ and $$i = \sqrt{-1}$$) has a solution, are $$p$$ and $$q$$ respectively; then $$4(p^2 + q^2)$$ is equal to ______.

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NTA JEE Main 24th February 2021 Shift 1 - Question 82

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If one of the diameters of the circle $$x^2 + y^2 - 2x - 6y + 6 = 0$$ is a chord of another circle $$C$$, whose center is at (2, 1), then its radius is ______.

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NTA JEE Main 24th February 2021 Shift 1 - Question 83

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Let $$A = \{n \in N : n \text{ is a 3-digit number}\}$$, $$B = \{9k + 2 : k \in N\}$$ and $$C = \{9k + l : k \in N\}$$ for some $$l$$ ($$0 < l < 9$$). If the sum of all the elements of the set $$A \cap (B \cup C)$$ is $$274 \times 400$$, then $$l$$ is equal to ______

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NTA JEE Main 24th February 2021 Shift 1 - Question 84

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Let $$P = \begin{pmatrix} 3 & -1 & -2 \\ 2 & 0 & \alpha \\ 3 & -5 & 0 \end{pmatrix}$$, where $$\alpha \in R$$. Suppose $$Q = [q_{ij}]$$ is a matrix satisfying $$PQ = kI_3$$ for some non-zero $$k \in R$$. If $$q_{23} = -\frac{k}{8}$$ and $$det(Q) = \frac{k^2}{2}$$, then $$\alpha^2 + k^2$$ is equal to ______.

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NTA JEE Main 24th February 2021 Shift 1 - Question 85

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Let $$M$$ be any $$3 \times 3$$ matrix with entries from the set $$\{0, 1, 2\}$$. The maximum number of such matrices, for which the sum of diagonal elements of $$M^T M$$ is seven, is ______.

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NTA JEE Main 24th February 2021 Shift 1 - Question 86

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$$\lim_{n \to \infty} \tan \sum_{r=1}^{n} \tan^{-1}\frac{1}{1 + r + r^2}$$ is equal to ______.

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NTA JEE Main 24th February 2021 Shift 1 - Question 87

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The minimum value of $$\alpha$$ for which the equation $$\frac{4}{\sin x} + \frac{1}{1 - \sin x} = \alpha$$ has at least one solution in $$\left(0, \frac{\pi}{2}\right)$$ is ______.

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NTA JEE Main 24th February 2021 Shift 1 - Question 88

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If $$\int_{-a}^{a} (|x| + |x - 2|) dx = 22$$, $$a > 2$$ , then $$\int_{-a}^{a} (x + |x|) dx$$ is equal to ______

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NTA JEE Main 24th February 2021 Shift 1 - Question 89

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Let three vectors $$\vec{a}$$, $$\vec{b}$$ and $$\vec{c}$$ be such that $$\vec{c}$$ is coplanar with $$\vec{a}$$ and $$\vec{b}$$, $$\vec{a} \cdot \vec{c} = 7$$ and $$\vec{b}$$ is perpendicular to $$\vec{c}$$, where $$\vec{a} = -\hat{i} + \hat{j} + \hat{k}$$ and $$\vec{b} = 2\hat{i} + \hat{k}$$, then the value of $$2|\vec{a} + \vec{b} + \vec{c}|^2$$ is ______

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NTA JEE Main 24th February 2021 Shift 1 - Question 90

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Let $$B_i$$ ($$i = 1, 2, 3$$) be three independent events in a sample space. The probability that only $$B_1$$ occur is $$\alpha$$, only $$B_2$$ occurs is $$\beta$$ and only $$B_3$$ occurs is $$\gamma$$. Let $$p$$ be the probability that none of the events $$B_i$$ occurs and these 4 probabilities satisfy the equations $$(\alpha - 2\beta)p = \alpha\beta$$ and $$(\beta - 3\gamma)p = 2\beta\gamma$$ (All the probabilities are assumed to lie in the interval (0, 1)). Then $$\frac{P(B_1)}{P(B_3)}$$ is equal to ______.

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