NEET 2020 — Code HAKAN-F4

The quantities of heat required to raise the temperature of two solid copper spheres of radii r 1 and r 2 (r 1 = 1.5 r 2 ) through 1 K are in the ratio :

Find the torque about the origin when a force of ∧ 3 N j acts on a particle whose position vector is 2 m k ∧ .

For transistor action, which of the following statements is correct ?

A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (g = 10 m/s 2 )

The Brewsters angle i b for an interface should be :

For the logic circuit shown, the truth table is :

The solids which have the negative temperature coefficient of resistance are :

The increase in the width of the depletion region in a p-n junction diode is due to :

Dimensions of stress are :

Taking into account of the significant figures, what is the value of 9.99 m − 0.0099 m ?

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, the original frequency of B will be :

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ , then the angle of incidence is nearly equal to :

The capacitance of a parallel plate capacitor with air as medium is 6 μ F. With the introduction of a dielectric medium, the capacitance becomes 30 μ F. The permittivity of the medium is : ( ȏ 0 = 8.85 × 10 − 12 C 2 N − 1 m − 2 )

Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass. The centre of mass of the system from the 5 kg particle is nearly at a distance of :

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A m − 1 . The permeability of the material of the rod is : ( μ 0 = 4 π× 10 − 7 T m A − 1 )

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : (c = speed of electromagnetic waves)

The phase difference between displacement and acceleration of a particle in a simple harmonic motion is :

A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L 1 when mass M is suspended from its free end. The expression for Young’s modulus is :

The mean free path for a gas, with molecular diameter d and number density n can be expressed as :

The energy equivalent of 0.5 g of a substance is :

An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is 1.227 × 10 − 2 nm, the potential difference is :

A short electric dipole has a dipole moment of 16 × 10 − 9 C m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60 8 with the dipole axis is : 9 2 2 0 1 9 10 N m /C 4       = × πȏ

A 40 μ F capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of the current in the circuit is, nearly :

The average thermal energy for a mono-atomic gas is : (k B is Boltzmann constant and T, absolute temperature)

Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :

Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :

A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27 8 C. Its density is : (R = 8.3 J mol − 1 K − 1 )

The color code of a resistance is given below : The values of resistance and tolerance, respectively, are :

Which of the following graph represents the variation of resistivity ( ρ ) with temperature (T) for copper ?

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is :

When a uranium isotope 235 92 U is bombarded with a neutron, it generates 89 36 Kr , three neutrons and :

A charged particle having drift velocity of 7.5 × 10 − 4 m s − 1 in an electric field of 3 × 10 − 10 Vm − 1 , has a mobility in m 2 V − 1 s − 1 of :

Light with an average flux of 20 W/cm 2 falls on a non-reflecting surface at normal incidence having surface area 20 cm 2 . The energy received by the surface during time span of 1 minute is :

For which one of the following, Bohr model is not valid ?

A spherical conductor of radius 10 cm has a charge of 3.2 × 10 − 7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere ? 9 2 2 0 1 9 10 N m /C 4       = × πȏ

The energy required to break one bond in DNA is 10 − 20 J. This value in eV is nearly :

In a certain region of space with volume 0.2 m 3 , the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is :

A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : ( μ 0 = 4 π× 10 − 7 T m A − 1 )

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?

A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :

A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth ?

A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is 3 π . If instead C is removed from the circuit, the phase difference is again 3 π between current and voltage. The power factor of the circuit is :

The ovary is half inferior in :

Identify the wrong statement with regard to Restriction Enzymes.

Identify the wrong statement with reference to transport of oxygen.

In water hyacinth and water lily, pollination takes place by :

If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10 9 bp, then the length of the DNA is approximately :

Dissolution of the synaptonemal complex occurs during :

The body of the ovule is fused within the funicle at :

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ?

Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action ? (a) Darwin’s Finches of Galapagos islands. (b) Herbicide resistant weeds. (c) Drug resistant eukaryotes. (d) Man-created breeds of domesticated animals like dogs.

Identify the correct statement with reference to human digestive system.

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are :

The transverse section of a plant shows following anatomical features : (a) Large number of scattered vascular bundles surrounded by bundle sheath. (b) Large conspicuous parenchymatous ground tissue. (c) Vascular bundles conjoint and closed. (d) Phloem parenchyma absent. Identify the category of plant and its part :

Bilaterally symmetrical and acoelomate animals are exemplified by :

Goblet cells of alimentary canal are modified from :

Which of the following is not an attribute of a population ?

Embryological support for evolution was disapproved by :

Which one of the following is the most abundant protein in the animals ?

Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle ?

The sequence that controls the copy number of the linked DNA in the vector, is termed :

The plant parts which consist of two generations - one within the other : (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovule

The roots that originate from the base of the stem are :

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

Which of the following would help in prevention of diuresis ?

Montreal protocol was signed in 1987 for control of :

Meiotic division of the secondary oocyte is completed :

By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams ?

If the head of cockroach is removed, it may live for few days because :

Identify the incorrect statement.

Select the option including all sexually transmitted diseases.

Identify the wrong statement with reference to immunity.

Which of the following statements is correct ?

According to Robert May, the global species diversity is about :

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their :

Which of the following pairs is of unicellular algae ?

The enzyme enterokinase helps in conversion of :

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is :

Which of the following is put into Anaerobic sludge digester for further sewage treatment ?

Select the correct statement.

Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ?

Which of the following is correct about viroids ?

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits ?

Which of the following regions of the globe exhibits highest species diversity ?

Flippers of Penguins and Dolphins are examples of :

The number of substrate level phosphorylations in one turn of citric acid cycle is :

Which of the following statements is not correct ?

Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G 0 ). This process occurs at the end of :

The process of growth is maximum during :

The QRS complex in a standard ECG represents :

Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to :

In which of the following techniques, the embryos are transferred to assist those females who cannot conceive ?

Floridean starch has structure similar to :

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

Which of the following statements are true for the phylum-Chordata ? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.

The first phase of translation is :

Identify the basic amino acid from the following.

The infectious stage of Plasmodium that enters the human body is :

Identify the correct statement with regard to G 1 phase (Gap 1) of interphase.

In light reaction, plastoquinone facilitates the transfer of electrons from :

The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :

Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells ?

Identify the substances having glycosidic bond and peptide bond, respectively in their structure :

Experimental verification of the chromosomal theory of inheritance was done by :

The specific palindromic sequence which is recognized by EcoRI is :

Name the enzyme that facilitates opening of DNA helix during transcription.

Select the correct match.

From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask :

Cuboidal epithelium with brush border of microvilli is found in :

Strobili or cones are found in :

Snow-blindness in Antarctic region is due to :

Choose the correct pair from the following :

Which of the following statements about inclusion bodies is incorrect ?

Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases

Ray florets have :

Which of the following is not an inhibitory substance governing seed dormancy ?

In gel electrophoresis, separated DNA fragments can be visualized with the help of :

Which of the following is a natural polymer ?

On electrolysis of dil.sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be :

An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is :

The correct option for free expansion of an ideal gas under adiabatic condition is :

Which of the following set of molecules will have zero dipole moment ?

A mixture of N 2 and Ar gases in a cylinder contains 7 g of N 2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N 2 is : [Use atomic masses (in g mol − 1 ) : N = 14, Ar = 40]

Identify the correct statements from the following : (a) CO 2 (g) is used as refrigerant for ice-cream and frozen food. (b) The structure of C 60 contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.

The mixture which shows positive deviation from Raoult’s law is :

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?

Which one of the followings has maximum number of atoms ?

Which of the following alkane cannot be made in good yield by Wurtz reaction ?

Which of the following is not correct about carbon monoxide ?

For the reaction, 2Cl(g) → Cl 2 (g), the correct option is :

Urea reacts with water to form A which will decompose to form B . B when passed through Cu 2 + (aq), deep blue colour solution C is formed. What is the formula of C from the following ?

Hydrolysis of sucrose is given by the following reaction. Sucrose + H 2 O ⇌ Glucose + Fructose If the equilibrium constant (K c ) is 2 × 10 13 at 300 K, the value of ∆ r G s at the same temperature will be :

The calculated spin only magnetic moment of Cr 2 + ion is :

Measuring Zeta potential is useful in determining which property of colloidal solution ?

Which of the following is a cationic detergent ?

Find out the solubility of Ni(OH) 2 in 0.1 M NaOH. Given that the ionic product of Ni(OH) 2 is 2 × 10 − 15 .

Identify compound X in the following sequence of reactions :

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.

An increase in the concentration of the reactants of a reaction leads to change in :

The rate constant for a first order reaction is 4.606 × 10 − 3 s − 1 . The time required to reduce 2.0 g of the reactant to 0.2 g is :

The number of Faradays(F) required to produce 20 g of calcium from molten CaCl 2 (Atomic mass of Ca = 40 g mol − 1 ) is :

Identify the correct statement from the following :

Identify a molecule which does not exist.

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?

HCl was passed through a solution of CaCl 2 , MgCl 2 and NaCl. Which of the following compound(s) crystallise(s) ?

Which of the following amine will give the carbylamine test ?

Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :

Sucrose on hydrolysis gives :

An alkene on ozonolysis gives methanal as one of the product. Its structure is :

Identify the incorrect statement.

Which of the following is a basic amino acid ?

Which of the following oxoacid of sulphur has − O − O − linkage ?

Elimination reaction of 2-Bromo-pentane to form pent-2-ene is : (a) β -Elimination reaction (b) Follows Zaitsev rule (c) Dehydrohalogenation reaction (d) Dehydration reaction

The freezing point depression constant (K f ) of benzene is 5.12 K kg mol − 1 . The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :

Paper chromatography is an example of :

What is the change in oxidation number of carbon in the following reaction ? CH 4 (g) + 4Cl 2 (g) → CCl 4 (l) + 4HCl(g)

Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as :

The number of protons, neutrons and electrons in 175 71 Lu , respectively, are :