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JEE Main Practice Test- 20 - JEE MCQ


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30 Questions MCQ Test - JEE Main Practice Test- 20

JEE Main Practice Test- 20 for JEE 2024 is part of JEE preparation. The JEE Main Practice Test- 20 questions and answers have been prepared according to the JEE exam syllabus.The JEE Main Practice Test- 20 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Main Practice Test- 20 below.
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JEE Main Practice Test- 20 - Question 1

A resistance of 40 ohm and an inductance of 95.5 millihenry are connected in series in a 50 cycles/second A.C. circuit. The impedance of this combination is very nearly

Detailed Solution for JEE Main Practice Test- 20 - Question 1
JEE Main Practice Test- 20 - Question 2

A coil of 40 H inductance is connected in series with a resistance of 8 Ω and the combination is joined to the terminals of a 2 V battery. The time-constant of the circuit is

Detailed Solution for JEE Main Practice Test- 20 - Question 2
In case of an inductive resistive circuit, the time constant is given as L(eq)/R(eq).
So, in the given case 
L(eq)=40H
R(eq)=8 ohm
Thus, time cons.=40/8=5s
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JEE Main Practice Test- 20 - Question 3

An object of mass 10 kg is whirled round a horizontal circle of radius 4 m by a revolving string inclined 30º to the vertical. If the uniform speed of the object is 5 ms⁻1, the tension in the string is

JEE Main Practice Test- 20 - Question 4

The innermost orbit of the hydrogen atom has a diameter 1.06 Å. The diameter of tenth orbit is

Detailed Solution for JEE Main Practice Test- 20 - Question 4
Radius of an atom is directly proportional to n^2 and
radius of nth orbit = Radius of first orbit multiplied by n^2
so that will give you
diameter of n = 10 orbit
will be

1.06x (10)^2= 106 Å
JEE Main Practice Test- 20 - Question 5

For the production of X-rays, the target should be made of

JEE Main Practice Test- 20 - Question 6

The mass of photon at rest is

JEE Main Practice Test- 20 - Question 7

An electric dipole is placed along the X-axis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle π/3 with the X axis. If electric field at P makes an angle θ with X-axis, the value of θ is

JEE Main Practice Test- 20 - Question 8

Two charged conducting spheres of radii a and b are connected to each other by a wire. The ratio of electric fields at the surface of two spheres is

Detailed Solution for JEE Main Practice Test- 20 - Question 8
JEE Main Practice Test- 20 - Question 9

A lift is moving upward with increasing speed with acceleration 'a'. The apparent weight will be

JEE Main Practice Test- 20 - Question 10

If the coefficient of friction between the tyres and the road is 0.4, then maximum speed of a car on a road-turn of radius 30 m, will be

Detailed Solution for JEE Main Practice Test- 20 - Question 10

JEE Main Practice Test- 20 - Question 11

Two NOT gates are connected at the two inputs of a NAND gate. This combination will behave like

JEE Main Practice Test- 20 - Question 12

A long solenoid has a radius a and number of turns per unit length is n. If it carries a current I, then the magnetic field on its axis is directly propotional to

JEE Main Practice Test- 20 - Question 13

A horizontal pipe line carries water in a streamline flow. At a point along the pipe where cross-sectional area is 10 cm2, the velocity of water is 1 m-s⁻1 and pressure is 2000 Pa. The pressure of water, at another point where cross-sectional area is 5 cm2, is (Density of water = 1000 kg-m⁻3)

JEE Main Practice Test- 20 - Question 14

A particle has an initial velocity of 3 i ‸ + 4 j ‸ and an acceleration of 0.4 i ‸ + 0.3 j ‸ . Its speed after 10s is-

JEE Main Practice Test- 20 - Question 15

If in a nuclear reactor using U235 as fuel, the power output is 4.8 mega watts, the number of fissions per second is:
(energy released per fission of U235 = 200 MeV; 1eV = 1.6 x 10 − 19 J)

JEE Main Practice Test- 20 - 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): Air quickly leaking out of a balloon becomes cooler.
Reason(R): The leaking air undergoes adiabatic expansion. Reason(R): The leaking air undergoes adiabatic expansion.

JEE Main Practice Test- 20 - 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):If the string of a descending lift is broken, then it will fall down like a free body.
Reason(R):The acceleration of a free body is always 'g'.

JEE Main Practice Test- 20 - Question 18

A circular disc is rotating with angular velocity ω. A man sitting at the edge walks towards the centre of disc, then the angular velocity ω

JEE Main Practice Test- 20 - Question 19

During an adiabatic process, the pressure of a gas is proportional to the cube of its adiabatic temperature. The value of for that gas is

JEE Main Practice Test- 20 - Question 20

SI unit of magnetic dipole moment is

JEE Main Practice Test- 20 - Question 21

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double-slit experiment, is

Detailed Solution for JEE Main Practice Test- 20 - Question 21

JEE Main Practice Test- 20 - Question 22

Two identical light waves, propagating in the same direction, have a phase difference δ . After they superpose the intensity of the resulting wave will be proportional to

JEE Main Practice Test- 20 - Question 23

When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of

JEE Main Practice Test- 20 - Question 24

The intensity of a harmonic wave

JEE Main Practice Test- 20 - Question 25

The transition from the state n = 4 to n = 3 in hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from-

JEE Main Practice Test- 20 - Question 26

A capacitor of capacity C₁ is charged by connecting it across a battery of e.m.f. V₀. The battery is then removed and the capacitor is connected in parallel with an uncharged capacitor of capacity C₂. The potential difference across this combination is

JEE Main Practice Test- 20 - Question 27

If a particle of mass m is projected from the lowest point of smooth vertical circle of radius 'A' with velocity 5 a g the pressure at its lowest point will be—

JEE Main Practice Test- 20 - Question 28

A series combination of two resistors 1 Ω each is connected to a 12 V battery of internal resistance 0.4Ω. The current flowing through it is

JEE Main Practice Test- 20 - Question 29

The figure to the right shows an edge-on view of three extremely large, parallel insulating sheets positively charged with uniform and identical surface charge densities. In which of the regions shown is the electric field a maximum?

JEE Main Practice Test- 20 - Question 30

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of magnetic field far away is

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