NEET 2020 Phase 1 – PYQ Practice

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 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?

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

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 screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is :

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

The energy equivalent of 0.5 g of a substance is :

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

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?

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 :

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

Dimensions of stress are :

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 of A is 530 Hz, the original freqnency of B will be :

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 :

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

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 systems is thermally insulated. The stop cock is suddenly opened. The Process is :

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

Which one of the following has maximum number of atoms?

Which of the following is not correct about carbon monoxide?

Which of the following is a basic amino acid?

Paper chromatography is an example of :

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

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

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

Identify the incorrect statement.

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

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

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

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

Sucrose on hydrolysis gives :

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

Which of the following amine will give the carbylamine test?

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

Identify a molecule which does not exist.

As alkene on ozonolysis gives methanal as one of the product, Its structure is :

Anisole on cleavage with Hl gives :

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

Which of the following is correct about viroids?

Which of the following pairs is of unicellular algae?

Floridean starch has structure similar to

Strobili or cones are found in

Bilaterally symmetrical and acoelomate animals are exemplified by

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

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

Ray florets have

The ovary is half inferior in:

Identify the incorrect statement.

The roots that originate from the base of the stem are

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

Cuboidal epithelium with brush border of microvilli is found in

Which of the following statements about inclusion bodies is incorrect?

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

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

Match the following with respect to meiosis (A) Zygotene      (i) Terminalization (B) Pachytene     (ii) Chiasmata (C) Diplotene      (iii) Crossing over (D) Diakinesis     (iv) Synapsis Select the correct option from the following

Dissolution of the synaptonemal complex occurs during

In light reaction, plastoquinone facilitates the transfer of electrons from

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

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

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

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

Select the correct events that occur during inspiration. (i) Contraction of diaphragm (ii) Contraction of external inter-costal muscles (iii) Pulmonary volume decreases (iv) Intra pulmonary pressure increases

Identify the wrong statement with reference to transport of oxygen.

The QRS complex in a standard ECG represents

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

Which of the following would help in prevention of diuresis?

Select the correct statement

The body of the ovule is fused within the funicle at

The plant parts which consist of two generations - one within the other (i) Pollen grains inside the anther (ii) Germinated pollen grain with two male gametes (iii) Seed inside the fruit (iv) Embryo sac inside the ovule

Meiotic division of the secondary oocyte is completed

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

Select the option including all sexually transmitted diseases.

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

Experimental verification of the chromosomal theory of inheritance was done by

Embryological support for evolution was disapproved by

Select the correct match

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 × 109 bp, then the length of the DNA is approximately

Which of the following statements is correct?

The first phase of translation is

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

Flippers of Penguins and Dolphins are examples of

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.

The infectious stage of Plasmodium that enters the human body is

Identify the wrong statement with reference to immunity

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

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

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

Identify the wrong statement with regard to Restriction Enzymes

The specific palindromic sequence which is recognized by EcoRl is

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

Which of the following statements is not correct?

The process of growth is maximum during

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

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

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

Match the trophic levels with their correct species examples in grassland ecosystem. (A) Fourth trophic level   (i) Crow (B) Second trophic level  (ii) Vulture (C) First trophic level      (iii) Rabbit (D) Third trophic level    (iv) Grass Select the correct option

According to Robert May, the global species diversity is about

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

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

Choose the correct pair from the following

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

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

Identify the basic amino acid from the following