NEET Part Test - 8 - NEET MCQ

# NEET Part Test - 8 - NEET MCQ

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## 180 Questions MCQ Test NEET Mock Test Series 2025 - NEET Part Test - 8

NEET Part Test - 8 for NEET 2024 is part of NEET Mock Test Series 2025 preparation. The NEET Part Test - 8 questions and answers have been prepared according to the NEET exam syllabus.The NEET Part Test - 8 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Part Test - 8 below.
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NEET Part Test - 8 - Question 1

### The diagram shows a solenoid and a loop such that the solenoid’s axis lies in the plane of the loop. Both the solenoid and the loop carry constant currents in the directions as shown in the diagram. If the system is released from rest, the loop

Detailed Solution for NEET Part Test - 8 - Question 1

The loop rotates anticlockwise due to magnetic torque and as a result north and south poles will attract each other.

NEET Part Test - 8 - Question 2

### A massless rod connecting two particles each of mass m at the ends is hinged at its centre, such that it can rotate in horizontal plane. A wire of linear charge density λ is placed at a distance r parallel to rod in same horizontal plane. If one particle is slightly displaced, then angular frequency of small oscillations will be

Detailed Solution for NEET Part Test - 8 - Question 2

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NEET Part Test - 8 - Question 3

### Two hollow-core solenoids, A and B, are connected by a wire and separated by a large distance, as shown in the diagram. Two bar magnets, 1 and 2, are suspended just above the solenoids. If the magnet 1 is dropped through solenoid A as shown, then the magnet 2 will simultaneously be

Detailed Solution for NEET Part Test - 8 - Question 3

As the magnet -1 falls into solenoid A, the magnetic flux associated with solenoid A increase. From Lenz's law induced current in solenoid A will oppose this increase in magnetic flux. Hence direction of induced current in solenoids is as shown. The naure of magnetic field produced by solenoid B is as shown. Therefore magnet 2 will be attacted by magnetic field due to solwnoid B.

NEET Part Test - 8 - Question 4

Figure shows two large cylindrical shells having uniform linear charge densities +λ and – λ. Radius of inner cylinder is ‘a’ and that of outer cylinder is ‘b’. A charged particle of mass m, charge q revolves in a circle of radius r. Then its speed ‘v’ is : (Neglect gravity and assume the radii of both the cylinders to be very small in comparison to their length.)

Detailed Solution for NEET Part Test - 8 - Question 4

Electric field between the two cylinders =

∴ Force on charge

this force is centripetal force

∴

⇒  ∴

NEET Part Test - 8 - Question 5

The voltage applied to an X-ray tube is 18 kV. The maximum mass of photon emitted by the X-ray tube will be:

Detailed Solution for NEET Part Test - 8 - Question 5

Energy of photon is given by mcnow the maximum energy of photon is equal to the maximum energy of electron = eV

hence, mc2 = eV
⇒

NEET Part Test - 8 - Question 6

A current source sends a current i = i0 cos ωt). When connected across an unknown load gives a voltage output of, V = V0 sin (ωt + π/4) across that load. Then voltage across the current source may be brought in phase with the current through it by :

Detailed Solution for NEET Part Test - 8 - Question 6

v = v0 sin(ωt + π/4) = v0 cos (ωt-π/4)

Since v lags current, an inductor can bring ir in phase with current

NEET Part Test - 8 - Question 7

A uniform electric field exists in xy plane. The potential of points A (2,2), B(–2, 2) and C(2, 4) are 4V, 16V, 12V, respectively. The electric field is

Detailed Solution for NEET Part Test - 8 - Question 7

NEET Part Test - 8 - Question 8

Two identical samples (same material and same amount) P and Q of a radioactive substance having mean life T are observed to have activities AP & AQ respectively at the time of observation. If P is older than Q, then the difference in their ages is:

Detailed Solution for NEET Part Test - 8 - Question 8

NEET Part Test - 8 - Question 9

Half lives of two isotopes X and Y of a material are known to be 2 × 109 years and 4 × 109 years respectively. If a planet was formed with equal number of these isotopes, then the current age of planet, given that currently thematerial has 20% of X and 80% of Y by number, will be

Detailed Solution for NEET Part Test - 8 - Question 9

⇒

NEET Part Test - 8 - Question 10

AB and CD are uniform line charges of infinite length having charge density λ1 and λ2 and lying along the z axis and y-axis respectively. the force between them depends on the perpendicular distance between them, 'r' as   then the value of n is

Detailed Solution for NEET Part Test - 8 - Question 10

NEET Part Test - 8 - Question 11

Consider the sown circuit. the capacitor is unchanged when the switch is closed at time t = 0. Which of the circuit given in options is equivalent to the shown circuit as t approaches infinity ?

Detailed Solution for NEET Part Test - 8 - Question 11

Capacitor behaves as open circuit (when charged completely) after a long time.

NEET Part Test - 8 - Question 12

In the capacitor discharge formula q = q0 e-t/τ the symbol τ represents :

Detailed Solution for NEET Part Test - 8 - Question 12

τ is RC i.e time constant. After one time constant, capacitor loose 0.63 part of its initial charge.

NEET Part Test - 8 - Question 13

The resultant electric field at centre of a ring due to ring is zero. Which of the following is incorrect :

Detailed Solution for NEET Part Test - 8 - Question 13

Even for non uniform charge distributed field may be zero.

E.g when charges on diamerically opposite points are equal.

NEET Part Test - 8 - Question 14

In a series LR circuit, the voltage drop across inductor is 8 volt and across resistor is 6 volt. Then voltage applied and power factor of circuit respectively are:

Detailed Solution for NEET Part Test - 8 - Question 14

NEET Part Test - 8 - Question 15

A conducting disc rotates about its axis (passing through centre and perpendicular to the plane of disc) in a uniform magnetic field B and magnetic field is perpendicular to plane of disc. There are certain points marked on a chord joining two points C and G on the periphery of the disc.Point E is the midpoint of the chord. Points D and F are the midpoints of segments CE and EG respectively. The emf induced is maximum between the points: (Do not consider the emf due to centrifugal forces)

Detailed Solution for NEET Part Test - 8 - Question 15

Emf between a point and center is given by

Therefore emf between two points will be  where Rand R2 are the radial distance of the two point from the center. Since point C is farthest from the center and the point E nearest, the emf will be maximum between these points.

NEET Part Test - 8 - Question 16

Binding Energy per nucleon of a fixed nucleus XA is 6 MeV. It absorbs a neutron moving with KE = 2 MeV, and converts into Y, emitting a photon of energy 1 MeV. The Binding Energy per nucleon of Y (in MeV) is

Detailed Solution for NEET Part Test - 8 - Question 16

[Because absorption of energy decrease BE and release of energy increase BE]

In Y nuclues there are A+1 nucleons.

∴ BE per neuclon of Y nucleus =

NEET Part Test - 8 - Question 17

In a series R — L — C circuit, the frequency of the source is half of the resonance frequency. The nature of the circuit will be:

Detailed Solution for NEET Part Test - 8 - Question 17

NEET Part Test - 8 - Question 18

If the readings of v1 and v3 are 100 volt each then reading of v2 is :

Detailed Solution for NEET Part Test - 8 - Question 18

Resultant voltage = 200 volt

since Vand V3 are 1800 out of phase, the resultant voltage is equal to V2

∴  V2 = 200volt

NEET Part Test - 8 - Question 19

In the ideal oscillating circuit, the capacitance of the capacitor is 25 μF and has initial charge of 30 μC. The inductance of coil is 0.04 H. The maximum magnitude of current in the circuit, after closing the switch K is

Detailed Solution for NEET Part Test - 8 - Question 19

NEET Part Test - 8 - Question 20

A thin uniform wire AB of length 1 m, an unknown resistance X and a resistance of 12 Ω are connected by thick conducting strips, as shown in the figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. To obtain the value of X appropriate connections are made. Which one represents the correct combination if no deflection takes place in galvanometer.

Detailed Solution for NEET Part Test - 8 - Question 20

NEET Part Test - 8 - Question 21

An electron of mass m and charge e is accelerated from rest through a potential difference V in vaccum. Its final speed will be

NEET Part Test - 8 - Question 22

The electric potential V at any point x y z (all in meters) in space is given by V = 4x2 volt. The electric field at the point (1m, 0, 2m) in volt/metre is

NEET Part Test - 8 - Question 23

Four capacitors with capacitances C1 = 1 μF, C2 = 1.5 μF, C3 = 2.5 μF and C4 = 0.5 μF are connected as shown and are connected to 30 volt source. The potential difference between points a and b is

NEET Part Test - 8 - Question 24

Two spherical conductors A and B of radii a and b (b>a) are placed concentrially in air. The two are connected by a copper wire as showing in figure. Then the equivalent capacitance of the system is

NEET Part Test - 8 - Question 25

A wire has a non-uniform cross-sectional area as shown in figure. A steady current i flows through it. Which one of the following statement is correct ?

NEET Part Test - 8 - Question 26

A mass of 0.296 gm of copper is deposited from a solution of copper sulphate by a current 0.5 amp in 30 min. The e.c.e. of copper is

NEET Part Test - 8 - Question 27

A long wire is bent into the shape PQRST as shown in the adjoining figure with QRS being s semicircle with
centre O and radius r metre

A current of I ampere flows through it in the direction P → Q → R → S → T. Then the magnetic induction at the point O of the figure in vaccum is

NEET Part Test - 8 - Question 28

A proton, a deutron and an α-particle having the same kinetic energy are moving in circular trajectories in a
constant magnetic field. If rp, rd and rα denote respectively the radii of the trajectories of these particles then

NEET Part Test - 8 - Question 29

Susceptibility is positive and small for a

NEET Part Test - 8 - Question 30

The coefficient of mutal inductance between two coils depends upon

NEET Part Test - 8 - Question 31

Hot wire ammeters are used for measuring

NEET Part Test - 8 - Question 32

A parallel plate capacitor consists of two circular plates with radius R = 10 cm separated by d = 0.5mm. The capacitor is being charged at a uniform rate by applying a changing potential difference between the two plates. Asume that the field is due to displacement current only and that the rate at which the electric field between the plates changes is 5 × 1013 (V/m-s). The displacement current in the capacitor is

NEET Part Test - 8 - Question 33

The largest distance between the interatomic planes of a crystal is 10–7 cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

NEET Part Test - 8 - Question 34

The refractive index of a 60º prism is . Then the minimum angle of incidence of a ray of light that can be transmitted through the prism is

NEET Part Test - 8 - Question 35

The face AC of a prism ABC of refracting angle 30º is silvered. A ray is incident on face AB at an angle of 45º as shown in figure. The refracted ray undergoes reflection on face AC and retraces its path. The refractive index of the prisms is

NEET Part Test - 8 - Question 36

A point source is located 275 cm below the surface of a lake. The area of the surface that transmits all the light that emerges from the surface

NEET Part Test - 8 - Question 37

In a movie hall if the distance between the projector and the screen is increased by 1%, illumination on the screen is

NEET Part Test - 8 - Question 38

When a drop of oil is spread on a water surface, it displays beautiful colours in a day light because of

NEET Part Test - 8 - Question 39

Monochromatic green light of wave length 5×10–7 m illuminates a pair of slits 1mm apart. The separation of bright lines on the interference pattern formed on a screen 2 metres away is

NEET Part Test - 8 - Question 40

An alpha particle is accelerated through a potential difference of 200 volt. The increase in its kinetic energy, in electron volt is

NEET Part Test - 8 - Question 41

In black and white televisions, pictures on the screen are produced to bombardment of

NEET Part Test - 8 - Question 42

1 miligram radium has 2.68 × 1018 nuclei. Its half-life is 1620 years. After 3240 years, how many nuclei would have disintegrated ?

Detailed Solution for NEET Part Test - 8 - Question 42

NEET Part Test - 8 - Question 43

The radius R of a nuclear matter varies with A as

Detailed Solution for NEET Part Test - 8 - Question 43

B

NEET Part Test - 8 - Question 44

A semiconductor has an electron concentration of 6 × 1013/cm–3 and hole concentration of 9 × 1012/cm–3. The semiconductor is

NEET Part Test - 8 - Question 45

In the circuit shown, point  B  is earthed. The potential at the point A is

Detailed Solution for NEET Part Test - 8 - Question 45

NEET Part Test - 8 - Question 46

Consider the following metallurgical processes.
(i) Heating impure metal with CO and distilling the resulting volatile carbonyl (boiling point 43ºC) and finally decomposing at 150ºC to 200ºC to get the pure metal.
(ii) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide.
(iii) Electrolysing the molten electrolyte containing approximately equal amounts of the metal chloride and CaCl2 to obtain the metal.
The process used for obtaining sodium, nickel and copper are, respectively,

Detailed Solution for NEET Part Test - 8 - Question 46

(C) option matches with the correct statements for Na, Ni and Cu.

NEET Part Test - 8 - Question 47

Which of the following are incorrect on basis of above ellingham diagram for carbon

Detailed Solution for NEET Part Test - 8 - Question 47

[Same vaolme of gas so little changes in entropy]

[volume doubles so greater entropy change]

NEET Part Test - 8 - Question 48

Mole fraction of a non-electrolyte in aqueous solution is 0.07. If Kf is 1.86° mol–1 kg, depression in f.p., ΔTf, is:

Detailed Solution for NEET Part Test - 8 - Question 48

Firstly we have to convert mole fraction into molality.

NEET Part Test - 8 - Question 49

In the reaction N2 + 3H2 ⇌ 2NH3

and at some instant if

then at this instant value of  is :

Detailed Solution for NEET Part Test - 8 - Question 49

Hence the reaction will be at equilibrium at the given instant

NEET Part Test - 8 - Question 50

For adsorption of a gas on a solid, the plot of log (x/m) Vs log P is linear with a slope equal to
[n being a whole number]

Detailed Solution for NEET Part Test - 8 - Question 50

NEET Part Test - 8 - Question 51