List of top Questions asked in NEET (UG)- 2020

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 Vertebrate 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.

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

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 Finches of Galapagos islands. 
(b) Herbicide resistant weeds. 
(c) Drug resistant eukaryotes. 
(d) Man-created breeds of domesticated animals like dogs.

Which of the following pairs is of unicellular algae ?

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

Which of the following is cationic detergent?

Which of the following is a basic amino acid ?

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

The solids which have negative temperature coefficient of resistance are :

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:

Choose the correct pair from the following

Light with an average flux of $20\,\Omega/cm^2$ 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 :

A spherical conductor of radius 10 cm has a charge of \(3.2 \times 10^{-7} C\) distributed uniformly. What is the magnitude of electric field at a point \(15\,cm\) from the centre of the sphere?
\((\frac {1}{4\pi \epsilon_o} = 9 \times 10^9 Nm^2/C^2)\)

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

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

Match the organism with its use in biotechnology:

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

An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is $1.227 \times 10^{-2}nm$, the potential difference is :

Dimensions of stress are:

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

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?

Which of the following is a natural polymer?

Anisole on cleavage with HI gives :

Goblet cells of alimentary canal are modified from

HCl was passed through a solution of $CaCl_2$,$MgCl_2$ and $NaCl$. Which of the following compound(s) crystallise(s)?