Part Test 8 For NEET 2021

A metallic ring is attached to the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be 

The current through a choke coil increases from zero to 6 A in 0.2 seconds and an induced emf of 30 V is produced. The inductance of the coil is

A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2×10−5 Wb/m2. The coil is rotated through 180° in 0.2. The average e.m.f. induced in the coil, in milli-volts, is

A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in the diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when 

Two rails of a railway track insulated from each other and the ground are connected to a millivolt meter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr. along the track? Given that the vertical component of earth’s magnetic field is 0.2 × 10^–4 weber/m² and the rails are separated by 1 metre 

(A) 10^–2 volt

(B) 10^–4 volt

(C) 10^–3 volt

(D) 1 volt

One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be 

Two coils of self-inductance L₁ and L₂ are placed closer to each other so that total flux in one coil is completely linked with other. If M is mutual inductance between them, then

In the circuit given below, the reading of the voltmeter V will be

A step-down transformer is connected to 2400 volts line and 80 amperes of current is found to flow in output load. The ratio of the turns in primary and secondary coil is 20: 1. If transformer efficiency is 100%, then the current flowing in primary coil will be 

L, C and R represent physical quantities inductance, capacitance and resistance respectively. The combination representing dimension of frequency is 

(A) LC

(B) (LC)^–1/2

(C) (L/C) −1/2

(D) C/L

If the peak current is given by I_p, then how much power is dissipated by a sinusoidal ac current which flows through resistor of resistance R?

A. Ip ²RcosΘ

B. 4/π Ip ²R

C. 1/π Ip ²R

D. ½ Ip ²R

What is the frequency of ac mains in India?

What is the correct relationship between refractive indices n,n₁ and n₂ if the behaviour of light is as shown in the figure?

What is the peak value of the voltage of an electric lamp connected to a 220 V, 50 Hz supply?

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

A series R-C circuit is connected to an alternating voltage source. Consider two situations:

1. When the capacitor is air-filled.
2. When the capacitor is mica filled.

Current through the resistor is I and voltage across the capacitor is V then

(a)V_a<V_b

(b)V_a>V_b

(c)i_a>i_b

(d)V_a=V_b

The condition under which a microwave oven heats up a food item containing water molecules most efficiently in

The electric field associated with an electromagnetic wave in vacuum is given by E= 40 cos (kz−6×10^8 t), where E, z, and t are in volt/m, meter, and second respectively. The value of wave vector k is:

The electric and the magnetic field, associated with an electromagnetic wave, propagating along the +z-axis, can be represented by

1. [E=E0ˆk, B=˙B0ˆI]
2.  [E=E0ˆj, B=B0ˆj]
3.  [E=E0ˆj, B=B0ˆk]
4.  [E=E0ˆi, B=B0ˆj]

The electric field of an electromagnetic wave in free space is given by →E=10 cos (10^7t+kx) ˆj V/m, where t and x are in seconds and meters respectively. It can be inferred that

(1) The wavelength λ is 188.4 m.

(2) The wave number k is 0.33 rad/m.

(3) The wave amplitude is 10 V/m.

(4) The wave is propagating along +x direction

Which one of the following pairs of statements is correct?

The direction in which electromagnetic waves propagate is the same as that of

In an electromagnetic wave in free space, the root mean square value of the electric field is 6 V/m. The peak value of the magnetic field is

1. 2.83 x 10^-8 T
2. 1.51 x 10^-8 T
3. 0.80 x 10^-8 T
4. 4 x 10^-8 T

When a thin convex lens of glass 5D is immersed in a liquid, it behaves as a divergent lens of focal length 100 cm. What is the refractive index of the liquid?

If a medium has a critical angle for total internal reflection from the medium to vacuum as 30⁰, what is the velocity of light in the medium?

1. 0.5 × 10⁸ m/s
2. 3 × 10⁸ m/s
3. 1.5 × 10⁸ m/s
4. 0.2 × 10⁸ m/s

A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

Two identical glass (μg=3/2) equi-convex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water (μw=4/3). The focal length of the combination is

The refracting angle of a prism is A, and refractive index of the material of the prism  is cot (A/2).The angle of minimum deviation is−

(a) 180°−3A

(b) 180°−2A

(c) 90°−A

(d) 180°+2A

A plane-convex lens fits exactly into a Plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices μ₁ and μ₂ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5cm closer to the lens. The focal length of the lens is:

 R – Br + Cl^– –DMF–>R – Cl + Br^–  Which one of the following  has the highest relative rate?

1. CH₃CH₂Br
2. CH₃ – CH₂ – CH₂Br

When CH₃CH₂CHCl₂ is treated with NaNH₂, the product formed is

1. CH3 – CH = CH2
2. CH3 – C ≡ CH
3. 

Grignard reagent is prepared by the reaction between

Replacement of Cl of chloro-benzene to give phenol requires drastic conditions. But chlorine of 2, 4-dinitro-chloro-benzene is readily replaced

The alkylhalide is converted into an alcohol by

Chloropicrin is obtained by the reaction of

Which of the following is least reactive in a nucleophilic substitution reaction?

Which of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?

Which of the following is not chiral?

For (i) l^– , (ii) Cl^– , (iii) Br^–  , the increasing order of nucleophilicity would be

1. Cl^– < Br^–<l^–
2. l^– < Cl^– Br^–
3. Br^– < Cl < l^–
4. l^– < Br^– < Cl^–

Which of the following reactions is an example of nucleophilic substitution reaction ?

The reaction of toluene with Cl2 in presence of FeCl3 gives X and reaction in presence of light gives Y. Thus X and Y are

Which one is most reactive towards SN1 reaction?

1. C₆H₅CH₂Br
2. C₆H₅CH(C₆H₅)Br
3. C₆H₅CH(CH₃)Br
4. C₆H₅C(CH₃)(C₆H₆)Br

The correct order of increasing reactivity of C-X bond towards nucleophile in the following compound is

In the following reaction

C₆H₅CH₂Br  X

The product ‘X’ is

Which one of the following octahedral complexes will not show geometric isomerism? (A and B are monodentate ligands)

Among the following which is not the ∏-bonded organometallic compound?

1. K[PtCl₃(ƞ²– C₂H₄)]
2. Fe(ƞ⁵ – C₅H₅)₂
3. Cr(ƞ⁶– C₆H₆)₂
4. (CH₃)₄Sn

Which of the following is considered to be an anticancer species?

Which of the following coordination compounds would exhibit optical isomerism?

Among [Ni(CO)4], [Ni(CN)4]2-,[NiCl4]2- species, the hybridization states at the Ni atom are, respectively [Atomic number of Ni = 28]

1. sp³ , dsp² , dsp²
2. sp³ , dsp² , sp³
3. sp³ , sp³ dsp²
4. dsp², sp³ , sp³

CN- is a strong field ligand. This is due to the fact that

Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H₂O)₆]²⁺ will be (atomic number of Mn = 25)

Which of the following does not have a metal carbon bond?

1. Al(OC₂H₅)₃
2. C₂H₅MgBr
3. K[Pt(C₂H₄)Cl₃]
4. Ni(CO)₄

Which one of the following is an inner orbital complex as well as diamagnetic in behavior?

(Atomic number : Zn = 30, Cr = 24, Co = 27, Ni = 28)

1. [Zn(NH₃)₆]²⁺
2. [Cr(NH₃)₆]³⁺
3. [Co(NH₃)₆]³⁺
4. [Ni(NH₃)₆]²⁺

Which one of the following is expected to exhibit optical isomerism? (en = ethylenadiamine)

1. cis-[Pt(NH₃)₂Cl₂]
2. trans-[Pt(NH₃)₂Cl₂]
3. cis-[Co(en)₂Cl₂]⁺
4. trans-[Co(en)₂Cl₂]⁺

[Cr(H₂O)₆]Cl₃(at no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the Chromium of the complex is

1. 3d¹_xy , 3d¹_yz , 3d¹ _z2
2. 3d¹ _{(x2 – y2)} , 3d¹_z2 , 3d¹_xz
3. 3d¹_xy, 3d¹_(x2-y2), 3d¹_yz
4. 3d¹_xy, 3d¹_yz , 3d¹ _xz

[Co(NH3)4(NO2)2]Cl exhibits

The existence of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂]⁺ is due to

Crystal field stabilization energy for high spin d4 octahedral complex is

Which one of the following complexes is not expected to exhibit isomerism?

1. [Ni(NH₃)₄(H₂O)₂]²⁺
2. [Pt(NH₃)₂Cl₂]
3. [Ni(NH₃)₂Cl₂]
4. [Ni(en)₃]²⁺

Study the four statements (A – D) given below and select the two correct ones out of them.

1. Definition of biological species was given by Ernst Mayr.
2. Photoperiod does not affect reproduction in plants.
3. Binomial nomenclature system was given by R.H. Whittaker.
4. In unicellular organisms, reproduction is synonymous with growth.

The two correct statements are

Photoperiod affects flowering and reproduction in plants. Binomial nomenclature system was given by Carolus Linnaeus.

Which one of the following is not a correct statement?

As we go from species to kingdom in a taxonomic hierachy, the number of common characteristics

The system of classification based on evolutionary and genetic relationships among organisms, ignoring the morphological similarities or differences, is called

Taxonomic key is one of the taxonomic tools in the identification and classification of plants and animals. It is used in the preparation of

Which of the following components provides sticky character to the bacterial cell?

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

Fungi are filamentous with the exception of “X” which is unicellular. Identify X.

The figure below shows the structure of a bacteriophage. Identify its parts labelled as A, B, C and D.

Incorrect statement about “Fungi imperfecti” is :

(i) Green algae occur in fresh water, brackish water, salt water.

(ii) Habitat of Brown algae-fresh water (rare), brackish water, salt water

(iii) Some red algae are found in fresh water, mostly occur in salt water, some are in brackish water.

(iv) Most of the red algae are multicellular.

(v) Red alga may occur in both well lighted regions close to water-surface and also at great depths in oceans where light penetration is little.

(vi) Cell wall of red algae consists of cellulose + agar.

(vii) 2 – 8, equal and apical flagella in green algae

If a cell A with D.P.D. 4 bars is connected to cell B, C, D whose O.P. and T.P. are respectively 4 and 4, 10 and 5 and 7 and 3 bars, the flow of water will be

In which method of transport in plasma membrane does not require carrier molecule?

Which of the following facilitates opening of stomatal aperture?

Based on Munch’s pressure-flow hypothesis, which of the following conditions would increase the rate of translocation?

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

In part A of a plant, sugars are actively transported into the phloem tissue. In part B, sugars are actively transported out of the phloem. Which way will the phloem sap move under these conditions?

Study the following statements.

1. “X” hormone promotes root growth and root hair formation thus helping the plants to increase their absorption surface.
2. “Y” hormone induces flowering in mango and also promotes rapid internode/petiole elongation in deep plants and hence helping leaves or upper parts of shoot above water.

III. “Z” hormone inhibits the seed germination, increase the tolerance of plant to various stresses, play import in seed development, maturation and dormancy. Identify the correct names of hormones marked as ‘X’, ‘Y’ & ‘Z’.

Gibberellins can promote seed germination because of their influence on

Fruit and leaf drop at early stages can be prevented by the application of

Which one of the following growth regulators is known as ‘stress hormone’?

The picture below shows three different types of plants (marked as P-I, P-II and P-III) which flower on the basis of their critical photoperiod. Now identify these plants (P-I, II and III).

Induction of cell division and delay in senescence is done by

From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb : aabb will be obtained in the following ratio

Following is a pedigree for albinism (aa). What is the probability of II -1 to be a heterozygous ?

Gene which suppresses other gene’s activity but does not lie on the same locus is called as

The “Cri-du-Chat” syndrome is caused by change in chromosome structure involving

Among the following characters, which one was not considered by Mendel in his experiments on pea?

Erythroblastosis foetalis is caused when fertilization takes place between gametes of

Sickle cell anaemia is