NEET 2019 – PYQ Practice

The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively.

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

A body weight 200 N on the surface of earth. How much will it weight half way down to the centre of the earth?

Which of the following acts as a circuit protection device?

A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?

The unit of thermal conductivity is :

Pick the wrong answer in the context with rainbow.

Body A of mass 4m moving with speed u collides with another body B of mass 2 m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :

A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when :

In which of the following processes, heat is neither absorbed nor released by a system?

Which colour of the light has the longest wavelength?

Increase in tempertaure of a gas filled in a container would lead to :

Average velocity of a particle executing SHM in one complete vibration is :

The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by :

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre :

A force F = 20 + 10y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is :

A cylinderical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field. B with the distane d from the centre of the conductor, is correctly represented by the figure :

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is :

In which of the following devices, the eddy current effect is not used?

Two point charges A and B, having charges +Q and – Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :

For a p-type semiconductor, which of the following statements is true?

The non-essential amino acid among the following is :

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by :

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is :

The compound that is most difficult to protonate is :

The mixture that forms maximum boiling azeotrope is :

The correct order of the basic strength of methyl substituted amines in aqueous solution is :

Among the following, the reaction that proceeds through an electrophilic substitution, is :

For an ideal solution, the correct option is :

The manganate and permanganate ions are tetrahedral due to :

Which of the following species is not stable?

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

Which will make basic buffer?

The correct structure of tribromooctaoxide is :

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is [Given that 1 L bar = 100 J]

Which of the following is incorrect statement?

For the second period elements the correct increasing order of first ionization enthalpy is :

In which case change in entropy is negative?

Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth :

Which of the following statements is not correct?

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

Select the correct sequence for transport of sperm cells in male reproductive system :

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

Drug called ‘Heroin’ is synthesized by :

The concept of ''Omnis cellula-e cellula'' regarding cell division was first proposed by :

Variations caused by mutation, as proposed by Hugo de Vries, are :

Select the horomone-releasing Intra-Uterine Devices.

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

How does steroid hormone influence the cellular activities?

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

The shorter and longer arms of a submetacentric chromosome are referred to as:

Expressed Sequence Tags (ESTs) refers to :

Which of the following factors is responsible for the formation of concentrated urine?

What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL ?

What map unit (Centimorgan) is adopted in the construction of genetic maps?

Which of the following glucose transporters is insulin-dependent?

Under which of the following conditions will there be no change in the reading frame of following mRNA? 5' AACAGCGGUGCUAUU 3'

Which of the following is a commercial blood cholesterol lowering agent?

Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement.

Thiobacillus is a group of bacteria helpful in carrying out :

In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5kg die. Which type of selection process is taking place?

Which of the following statement is incorrect?

The Earth summit held in Rio de Janeiro in 1992 was called :

Which of the following is the most important cause for animals and plants being driven to extinction?

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.

Which of the following sexually transmitted diseases is not completely curable ?

Which of the following immune responses is responsible for rejection of kidney graft?

Select the correct group of biocontrol agents.

DNA precipitation out of a mixture of bimolecules can be achieved by treatment with :

Which one of the following is not a method of in situ conservation of biodiversity?

Pinus seed cannot germinate and establish without fungal association. This is because :

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?

Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains :

Which of the following ecological pyramids is generally inverted?

Which of the following can be used as a biocontrol agent in the treatment of plant disease?

Select the correct option :

The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in :

Conversion of glucose to glucose-6 phosphate, the first irreversible reaction of glycolysis, is catalyzed by

Use of an artificial kindney during hemodialysis may result in : (a) Nitrogenous waste build-up in the body (b) Non –elimination of excess potassium ions (c) Reduced absorption of calcium ions from gastro-intestinal tract (d) Reduced RBC production Which of the following options is the most appropriate?

In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as :

Extrusion of second polar body from egg nucleus occurs :

Phloem in gymnosperms lacks :

Which of the following pair of organelles does not contains DNA?

Respiratory Quotient (RQ) value of tripalmitin is :

Which of the following muscular disorders is inherited?

Purines found both in DNA and RNA are:

Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus :

Which part of the brain is responsible for thermoregulation?

Select the incorrect statement.

What is the site of perception of photoperiod necessary for induction of flowering in plants?

Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part, is :

What is the fate of the male gametes discharged in the synergid?

From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in :

Grass leaves curl inward during very dry weather. Select the most appropriate reason from the following :

What is the direction of movement of sugars in phloem?

Which of the following statements regarding mitochondria is incorrect?

Consider the following statements : (A) Coenzyme of metal ion that is tightly bound to enzyme protein is called prosthetic group. (B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme Select the correct option

Which of the following statements is incorrect?

Concanavalin A is :

Which of the statements given below is not true about formation of Annual Rings in trees?

Which of the following contraceptive methods do involve a role of hormone?

Consider following features: (a) Organ system level of organisation (b) Bilateral symmetry (c) True coelomates with segmentation of body Select the correct option of animal groups which possess all the above characteristics

The correct sequence of phases of cell cycle is :

Persistent nucellus in the seed is known as