NEET 2021 – PYQ Practice

A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is :

A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross section. The variation of magnetic field B(r) due to the cable with the distance 'r' from the axis of the cable is represented by :

A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding per nucleon of unfragmented nuclei is 7.6MeV while that of fragments is 8.5MeV. The total gain in the Binding Energy in the process is :

Polar molecules are the molecules :

A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is :

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively -

Consider the following statements (A) and (B) and identify the correct answer. (A) A Zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V.

A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is -

The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be :

The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is :

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :

For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?

If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?

A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of , (i) an equilateral tringle of side 'a' (ii) A square of side 'a' The magnetic dipole moments of the coil in each case respectively are :

Twenty seven drops of same size are charged at 220V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

The incorrect statement among the following is :

Given below are two statements : Statement I : Aspirin and Paracetamol belong to the class of narcotic analgesics. Statement II : Morphine and Heroin are non-narcotic analgesics. In the light of the above statements, choose the correct answer from the options given below.

Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II : As the size of the elements, F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.

Which of the following reactions is the metal displacement reaction? Choose the right option.

The compound which shows metamerism is :

Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

Ethylene diaminetetraacetate (EDTA) ion is :

The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on?

An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]

The correct structure of 2, 6-dimethyl-dec-4-ene is

The correct sequence of bond enthalpy of 'C-X' bond is :

Dihedral angle of least stable conformer of ethane is :

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

For irreversible expansion of an ideal gas under isothermal condition, the correct option is :

From the following pairs of ions which one is not an iso-electronic pair?

Which of the following molecules is non-polar in nature?

In which one of the following arrangements the given sequence is not strictly according to the properties indicted against it?

Which of the following is an incorrect statement?

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

The factor that leads to Founder effect in a population is :

Diadelphous stamens are found in

Gemmae are present in

A typical angiosperm embryo sac at maturity is :

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out :

DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as

Which of the following algae produce Carrageen?

Plants follow different pathways in response to environment of phases of life to form different kinds of structures. This ability is called

The site of perception of light in plants during photoperiodism is

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as :

Which of the following stages of meiosis involves division of centromere?

Which of the following statements is not correct?

Which of the following algae contains mannitol as reverse food material?

When gene targetting involving gene amplification is attempted in an individual's tissue to treat disease, it is known as :

In the equation GPP - R = NPP R represents :

When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as :

The plant hormone used to destroy weeds in a field

Which of the following are not secondary metabolites in plants?

Amensalism can be represented as :

Which of the following is not an application of PCR (Polymerase Chain Reaction)?

Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?

Which of the following statements is correct?

In some members of which of the following pairs of families, pollen grains retain their viability for months after release?

What is the role of RNA polymerase III in the process of transcription in eukaryotes?

Which of the following statements is incorrect?

Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because:

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as

Which of the following statements is incorrect?

Identify the correct statement.

Select the correct pair.

Receptors for sperm binding in mammals are present on :

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

Read the following statements (1) Metagenesis is observed in Helminths. (2) Echinoderms are triploblastic and coelomate animals. (3) Round worms have organ-system level of body organization. (4) Comb plates present in ctenophores help in digestion. (5) Water vascular system is characteristic of Echinoderms. Choose the correct answer from the options given below.

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

Which of the following statements wrongly represents the nature of smooth muscle?

Which one of the following belongs to the family Muscidae?

During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first?

Which one of the following is an example of Hormone releasing IUD?

The centriole undergoes duplication during :

Which of the following characteristics is incorrect with respect to cockroach?

Veneral diseases can spread through : (1) Using sterile needles (2) Transfusion of blood from infected person (3) Infector mother to foetus (4) Kissing (5) Inheritance Choose the correct answer from the option given below.

Which one of the following organisms bears hollow and pneumatic long bones?

Persons with 'AB' blood group are called as "Universal recipients". This is due to :

The organelles that are included in the endomembrane system are

A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is :

Identify the incorrect pair

With regard to insulin choose correct options. (1) C-peptide is not present in mature insulin. (2) The insulin produced by rDNA technology has C-peptide. (3) The pro-insulin has C-peptide (4) A-peptide and B-peptide of insulin are interconnected by disulphide bridges. Choose the correct answer from the options given below.

Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as :

Which of the following RNAs is not required for the synthesis of protein?

Erythropoietin hormone which stimulates R.B.C formation is produced by :

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection?

Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?

Following are the statements with reference to 'lipids'. (1) Lipids having only single bonds are called unsaturated fatty acids (2) Lecithin is a phospholipid. (3) Trihydroxy propane is glycerol (4) Palmitic acid has 20 carbon atoms including carboxyl carbon. (5) Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below.

During muscular contraction which of the following events occur? (1) 'H' zone disappears (2) 'A' band widens (3) 'I' band reduces in width (4) Myosine hydrolyzes ATP, releasing the ADP and Pi. (5) Z-lines attached to actins are pulled inwards. Choose the correct answer from the options given below.

Assertion (A) : A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations. Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen. In the light of the above statements, choose the correct answer from the options given below

Which of these is not an important component of initiation of parturition in humans?

Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

The Adenosine deaminase deficiency results into

Which one of the following statements about histones is wrong?

Statement I : The codon 'AUG' codes for methionine and phenylalanine. Statement II : 'AAA' and 'AAG' both codons code for the amino acid lysine. In the light of the above statements, choose the correct answer from the options given below.

Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.

Following are the statements about prostomium of earthworm. (1) It serves as a covering for mouth. (2) It helps to open cracks in the soil into which it can crawl. (3) It is one of the sensory structures. (4) It is the first body segment. Choose the correct answer from the options given below.