NEET Mock Test - 30 - NEET MCQ

NEET Mock Test - 30 - NEET MCQ

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180 Questions MCQ Test Additional Study Material for NEET - NEET Mock Test - 30

NEET Mock Test - 30 for NEET 2024 is part of Additional Study Material for NEET preparation. The NEET Mock Test - 30 questions and answers have been prepared according to the NEET exam syllabus.The NEET Mock Test - 30 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Mock Test - 30 below.
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NEET Mock Test - 30 - Question 1

Figure shows an L–R circuit. When the switch S is closed, the current through resistor R1, R2 and R3 are i1, i2 and i3 respectively. The value of i1, i2 and i3 at t = 0 s is

Detailed Solution for NEET Mock Test - 30 - Question 1

At t = 0, inductor in replaced by an open circuit.

NEET Mock Test - 30 - Question 2

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then

Detailed Solution for NEET Mock Test - 30 - Question 2

Since electron is moving along the field, force qE is repulsive and hence it will slow down.

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NEET Mock Test - 30 - Question 3

In a coaxial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

Detailed Solution for NEET Mock Test - 30 - Question 3

Construct an Ampere’s loop in the concerned regions to see the value of ip.

At a pont outside the co-axial tube at a diatance R from the central axis consider a circular path.
Then from Amperes Law closed integral of B.dl=μ0I(net)
the net current is zero as the current in the two cables flow in opposite directions.

therefore Magnetic field is zero outside

NEET Mock Test - 30 - Question 4

An electron in the beam of a TV picture tube is accelerated by a potential difference 2 kV. Then it passes through a transverse magnetic field to produce a circular arc of radius 0.18m. Find the magnetic field

Detailed Solution for NEET Mock Test - 30 - Question 4

Velocity v acquired  by the electron and accelerating  potential V are related by,
where e and m are charge and mass of the electron

NEET Mock Test - 30 - Question 5

Two ions have equal masses but one is singly-ionised and the other is doubly-ionised. They are projected from the same place in a uniform magnetic field with the same velocity perpendicular to the field.

Detailed Solution for NEET Mock Test - 30 - Question 5

The radius r of the path of charged particle with charge q in a uniform magnetic field(B) is given by

Now, if charge of singly ionized ion is e, then charge of doubly ionized ion is 2e. Hence, the circle described by the singly ionized charge will have a radius double that of the other one.

NEET Mock Test - 30 - Question 6

A conductor ABCDEF, shaped as shown, carries a current i. It is placed in the xy plane with the ends A and E on the x-axis. A uniform magnetic field of magnitude B exists in the region. Which of the following option is INCORRECT for the force acting on it?

Detailed Solution for NEET Mock Test - 30 - Question 6

NEET Mock Test - 30 - Question 7

A current-carrying ring is placed in a magnetic field. The direction of the field is perpendicular to the plane of the ring

NEET Mock Test - 30 - Question 8

A particle with mass m and positive charge q starts from rest at the origin shown in figure. There is a uniform electric field direction and a magnetic field B directed outward the plane of the page. It is shown in more advanced books that the path is a cycloid whose radius of curvature at the top points is twice the y-co-ordinates at that level.  The speed at any point (x, y) is

Detailed Solution for NEET Mock Test - 30 - Question 8

Work done by electric field = Change in K.E.

NEET Mock Test - 30 - Question 9

The value of Bohr magneton is

NEET Mock Test - 30 - Question 10

Consider a magnetic dipole kept in the north-south direction. Let P1, P2, Q1 and Q2 be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively. The directions of the magnetic field due to the dipole are the same at

Detailed Solution for NEET Mock Test - 30 - Question 10

NEET Mock Test - 30 - Question 11

Angle of dip at a place is 60° and earth's magnetic field is 8 µT. Its horizontal component BH is

Detailed Solution for NEET Mock Test - 30 - Question 11

NEET Mock Test - 30 - Question 12

The phenomenon of hysteresis represents the incapability of the material to

NEET Mock Test - 30 - Question 13

A small circular ring is kept inside a larger loop connected to a switch and a battery as shown. The direction of induced current when the switch is made

(i) ON
(ii) OFF after it was ON for a long time is

Detailed Solution for NEET Mock Test - 30 - Question 13

Using lenz law, it is evident that the induced current in the ring will oppose the effect caused by the current in the larger loop. When current is flowing in the larger loop a magnetic field will be set and the ring will oppose it, thus, inducing current in clockwise direction. Similarly when the switch is turned off, the induced current will be in anti-clockwise direction.

NEET Mock Test - 30 - Question 14

A rod AB m oves with a uniform velocity v in a uniform magnetic field as shown in figure

Detailed Solution for NEET Mock Test - 30 - Question 14

Due to electromagnetic induction, emf e is induced across the ends of the rod. This induced emf is given by
e=Bvl
The direction of this induced emf is from A to B, that is, A is at the higher potential and B is at the lower potential. This is because the magnetic field exerts a force equal to qvB on each free electron where q is −-1.6 × 10-16 C. The force is towards AB by Fleming's left-hand rule; hence, negatively charged electrons move towards the end B and get accumulated near it. So, a negative charge appears at B and a positive charge appears at A.

NEET Mock Test - 30 - Question 15

A conducting ring of radius 1m is placed in a varying magnetic field of B = 0.1t T (where t is time in second) with its plane right angle to B. What will be the induced electric field ?

Detailed Solution for NEET Mock Test - 30 - Question 15

NEET Mock Test - 30 - Question 16

Two conducting circular loops of radii R1 and R2 (R1 > > R2) are placed in the same plane with their centres coinciding. Find the mutual inductance between them.

Detailed Solution for NEET Mock Test - 30 - Question 16

Assume current i passes  through outer loop. Then  and

NEET Mock Test - 30 - Question 17

The number of turns in the primary and secondary coils of an ideal transformer are 100 and 300 respectively. If the input power is 60 watt the output power will be

Detailed Solution for NEET Mock Test - 30 - Question 17

No power loss in case of an ideal transformer.

NEET Mock Test - 30 - Question 18

The current in a series RL circuit decays as I = I0e–t/τ. Obtain the rms current in the interval 0 ≤ t ≤ τ

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NEET Mock Test - 30 - Question 19

An alternating current having peak value 14 A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used where i is

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NEET Mock Test - 30 - Question 20

The value of alternating emf in the following circuit will be

Detailed Solution for NEET Mock Test - 30 - Question 20

NEET Mock Test - 30 - Question 21

The values of L, C and R in an L-C-R series circuit are 4mH, 40pF and 100 Ω respectively. The quality factor of the current is

Detailed Solution for NEET Mock Test - 30 - Question 21

NEET Mock Test - 30 - Question 22

The self inductance of a motor of an electric fan is 10 H. In order to impart maximum power at 50 Hz, it should be connected to a capacitance of

Detailed Solution for NEET Mock Test - 30 - Question 22

Maximum power is transferred at resonance.

or

NEET Mock Test - 30 - Question 23

Consider the following two statements regarding a linearly polarised, plane electromagnetic wave:

(A) The electric field and the magnetic field have equal average values.
(B) The electric energy density and the magnetic energy density have equal average values

Detailed Solution for NEET Mock Test - 30 - Question 23

NEET Mock Test - 30 - Question 24

Which of the following rays is emitted by a human body?

Detailed Solution for NEET Mock Test - 30 - Question 24

IR because temperature of the body is 37°C and it emits heat radiation which falls in IR and microwave region.

NEET Mock Test - 30 - Question 25

In a permanent magnet at room temperature

Detailed Solution for NEET Mock Test - 30 - Question 25

At room temperature permanent magnet behaves as a ferromagnetic substance for a long period of time. At room temperature, the permanent magnet retains ferromagnetic property for a long period of time.

The individual atoms in a ferromagnetic material possess a dipole moment as in a paramagnetic material.

However, they interact with one another in such a way that they spontaneously align themselves in a common direction over a macroscopic volume called domain. Thus, we can say that in a permanent magnet at room temperature, domains are all perfectly aligned.

NEET Mock Test - 30 - Question 26

Consider the two idealized systems:

(i) a parallel plate capacitor with large plates and small separation and
(ii) a long solenoid of length L >> R, radius of cross-section.
In (i) E is ideally treated as a constant between plates and zero outside.
In (ii) magnetic field is constant inside the solenoid and zero outside.

These idealised assumption, however, contradict fundamental laws as below

Detailed Solution for NEET Mock Test - 30 - Question 26

Key concept: The electrostatic field lines, do not form a continuous closed path (this follows from the conservative nature of electric field) while the magnetic field lines form the closed paths.

Which implies that number of magnetic field lines entering the Gaussian surface is equal to the number of magnetic field lines leaving it. Therefore case (ii) is not possible.

NEET Mock Test - 30 - Question 27

The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as

Detailed Solution for NEET Mock Test - 30 - Question 27

Key concept: The self inductance L of a solenoid depends on various factor like geometry and magnetic permeability of the core material.
L = μr μn2 Al
where, n = N/l (no. of turns per unit length)
1.   No. of turns: Larger the number of turns in solenoid, larger is its self inductance.
2.  Area of cross section: Larger the area of cross section of the solenoid, larger is its self inductance.
3.  Permeability of the core material. The self inductance of a solenoid increases μr times if it is wound over an iron core of relative permeability μr.
The long solenoid of cross-sectional area A and length l, having A turns, filled inside of the solenoid with a material of relative permeability (e.g., soft iron, which has a high value of relative permeability) then its self inductance is L = μrμ0 N2 A/l
So, the self inductance L of a solenoid increases as l decreases and A increases because L is directly proportional to area and inversely proportional to length.
Important point: The self and mutual inductance of capacitance and resistance depend on the geometry of the devices as well as permittivity/ permeability of the medium.

NEET Mock Test - 30 - Question 28

A circular coil is being expanded radially in a region of magnetic field and no electromotive force is produced in the coil. This can be because

Detailed Solution for NEET Mock Test - 30 - Question 28

Key concept: As we know whenever the number of magnetic lines of force (magnetic flux) passing through a circuit changes an emf is produced in the circuit called induced emf. The induced emf persists only as long as there is a change or cutting of flux.
The induced emf is given by rate of change of magnetic flux linked with the circuit, i.e., e = -dФ/dt
According to the problem there is no electromotive force produced in the coil. Then the various arrangement are to be thought of in such a way that the magnetic flux linked with the coil does not change even if the coil is placed and expanded in magnetic field.
When circular coil expands radially in a region of magnetic field such that the magnetic field is in the same plane as the circular coil or we can say that direction of magnetic field is perpendicular to the direction of area (increasing) so that their dot product is always zero and hence change in magnetic flux is also zero.

Or
The magnetic field has a perpendicular (to the plane of the coil) component whose-magnitude is decreasing suitably in such a way that the dot product of magnetic field and surface area of plane of coil remain constant at every instant.

NEET Mock Test - 30 - Question 29

For an L CR  circuit, the power transferred from the driving source to the driven oscillator is then the INCORRECT option is

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NEET Mock Test - 30 - Question 30

Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such that

NEET Mock Test - 30 - Question 31

A conducting wire AB bent in the form of a parabola y2 = 2x carries a current i = 2 A as shown in figure. This wire is placed in a uniform magnetic field  Tesla. The magnetic force (in newton) on the wire is

Detailed Solution for NEET Mock Test - 30 - Question 31

NEET Mock Test - 30 - Question 32

A metal ring of radius r = 0.5 m with its plane normal to a uniform magnetic field B of induction 0.2 T carries a current i = 100 A. The tension in newtons developed in the ring is

Detailed Solution for NEET Mock Test - 30 - Question 32

T = RBI
= (0.5) (0.2) (100) = 10N.

NEET Mock Test - 30 - Question 33

Consider six wires coming into or out of the page, all with the same current. Rank the line integral of the magnetic field (from most positive to most negative) taken counterclockwise around each loop shown.

Detailed Solution for NEET Mock Test - 30 - Question 33

NEET Mock Test - 30 - Question 34

An electron is projected with velocity v0 in a uniform electric field E perpendicular to the field. Again it is projected with velocity v0 perpendicular to a uniform magnetic field B. If r1 is initial radius of curvature just after entering in the electric field and r2 is initial radius of curvature just after entering in magnetic field then the ratio r1 / r2 is equal to

Detailed Solution for NEET Mock Test - 30 - Question 34

NEET Mock Test - 30 - Question 35

Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field. They will move along circular paths.

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NEET Mock Test - 30 - Question 36

A particle having charge of 1C, mass 1 kg and speed 1 m/s enters a uniform magnetic field, having magnetic induction of 1T, at an angle θ = 30° between velocity vector and magnetic induction. The pitch of its helical path is (in meters)

Detailed Solution for NEET Mock Test - 30 - Question 36

NEET Mock Test - 30 - Question 37

A long straight wire carries a current along the x-axis. Consider the points A(0, 1, 0), B(0, 1, 1), C (1, 0, 1) and D(1, 1, 1). Which of the following pairs of points will have same magnetic fields?

Detailed Solution for NEET Mock Test - 30 - Question 37

NEET Mock Test - 30 - Question 38

Considering magnetic field along the axis of a circular current carrying loop of radius R, approximately at what distance from the centre of the loop the field is  times of its value at the centre?

Detailed Solution for NEET Mock Test - 30 - Question 38

NEET Mock Test - 30 - Question 39

A particle enters the region of a uniform magnetic field as shown in figure. The path of the particle inside the field is shown by a dark line. The particle is

NEET Mock Test - 30 - Question 40

A wire loop carrying current i is placed in the x–y plane. Magnetic induction at P is

Detailed Solution for NEET Mock Test - 30 - Question 40

NEET Mock Test - 30 - Question 41

A :  when frequency is greater than resonance frequency in a series LCR circuit, it will be an inductive circuit.

R : Resultant voltage will lead the current

NEET Mock Test - 30 - Question 42

A : For a charged particle describing uniform circular motion in a magnetic field T2 ∝ r3 (where T is time period of resolution and r is radius of the circle)

R : The rel ation T2 ∝ r3 is valid only when where f is force acting on the particle.

NEET Mock Test - 30 - Question 43

A : A charged particle is moving from origin in the region in which uniform magnetic field exists in zdirection and a uniform electric filed in y-direction. At a point p(x, y, z) speed of the particle is v. then v will depend on y only.

R : In combined electric field and magnetic fields work is done by electric field only.

NEET Mock Test - 30 - Question 44

A : A current carrying conductor produces only an electric filed

R : When a observer is put in the same frame as a moving charge, the observer will find no magnetic field associated with the charge.

NEET Mock Test - 30 - Question 45

A : The phenomenon of electromagnetic induction in accordance with Lenz's law represents the conservation of energy

R : Lenz's law give the same result as we define by the sign rules in Faraday's law.

Detailed Solution for NEET Mock Test - 30 - Question 45

Energy can enter or leave, but not instantaneously. Lenz' law is a consequence. As the change begins, the law says induction opposes and, thus, slows the change.The fact that electromagnetic induction in accordance with Lenz's law represents the conservation of energy can be easily explained.

NEET Mock Test - 30 - Question 46

What is major product of following reaction?

NEET Mock Test - 30 - Question 47

Which of the following compounds will have zero dipole moment?

NEET Mock Test - 30 - Question 48

The carbon –carbon bond length in the compounds

follows the order

Detailed Solution for NEET Mock Test - 30 - Question 48

As the bond strength increases, the bond length decreases. As we know, bond strength is inthe order of triple bond>double bond>single bond. The C-C bond length of benzene is intermediate between that of double bond and single bond due to resonance. Therefore in benzene, each C-C bind has a partial double bond character. Hence the bond is stronger than single bond and weaker than double bond
Hence here the answer comes B option

NEET Mock Test - 30 - Question 49

In the following compounds,

The order of basicity is

Detailed Solution for NEET Mock Test - 30 - Question 49

In IV lone pair is involved in resonance.

NEET Mock Test - 30 - Question 50

Detailed Solution for NEET Mock Test - 30 - Question 50

NEET Mock Test - 30 - Question 51

Consider the reaction given below:

Which of these is true regarding the reaction shown above?

Detailed Solution for NEET Mock Test - 30 - Question 51

From just viewing the compound we cannot tell whether the compound is dextro or levo isomers, so c and d options are obviously incorrect. Also since, cyanide group is converted into carboxylic acid group therefore the configuration of the chiral carbon has not changed, so first option is the correct answer

NEET Mock Test - 30 - Question 52

Which of these is the correct fischer projection for the wedge and dash formula given below?

NEET Mock Test - 30 - Question 53

Which of the following will be a product of the reaction

Detailed Solution for NEET Mock Test - 30 - Question 53

As redP,HI, converts carbonyl group into CH2 group, therefore, ethane will be formed from ethanoyl chloride.

NEET Mock Test - 30 - Question 54

NEET Mock Test - 30 - Question 55

Which of the following happens to be the carbanion with highest stability?

Detailed Solution for NEET Mock Test - 30 - Question 55

Option C is correct becz there is a strong electron withdrawing group -NO2 is at para position which decrease electron density at CH2(-) and hence increase stability.

NEET Mock Test - 30 - Question 56

The IUPAC name of the following compound

NEET Mock Test - 30 - Question 57

Which of the following molecule is (are) chiral?

Detailed Solution for NEET Mock Test - 30 - Question 57

NEET Mock Test - 30 - Question 58

Which of the following indicates the relative percentage the formation of 2-bromopropane on bromination of propane. The relative reactivities of 1° : 2° : 3° hydrogens to bromination is   1 : 82 : 1600

NEET Mock Test - 30 - Question 59

Trans-2-butene on bromination using CS2 gives which dibromoderivative?

Detailed Solution for NEET Mock Test - 30 - Question 59

See its anti addition so meso compound will be formed due to presence of POS so option D is correct

NEET Mock Test - 30 - Question 60

R1CH=CHR+ C6H5COOOH → (A) . Product (a) is

NEET Mock Test - 30 - Question 61

NEET Mock Test - 30 - Question 62

The most reactive of these compounds towards sulphonation is

Detailed Solution for NEET Mock Test - 30 - Question 62

Yes, m-xylene is more reactive toward sulphonation because it contain two methyl group, meta position to each other. This is the only reason which will increase electron density at ortho and para position and we know that high electron density at ortho and para is favourable for sulphonation. Hence among all these options d is correct.

NEET Mock Test - 30 - Question 63

Product (b) is

NEET Mock Test - 30 - Question 64

Gas X is same is

NEET Mock Test - 30 - Question 65

3-phenyl 1-butene is hydrolyzed (water addition) in the presence of small amount of HCl, the major product formed for the reaction should be

NEET Mock Test - 30 - Question 66