NEET 2020 question paper: sample questions

Question 1

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

Accepted Answer

Species interaction

Answer

Sex ratio

Answer

Natality

Answer

Mortality

Question 2

Identify the wrong statement with reference to transport of oxygen

Accepted Answer

Higher H⁺ conc. in alveoli favours the formation of oxyhaemoglobin

Answer

Binding of oxygen with haemoglobin is mainly related to partial pressure of O₂

Answer

Partial pressure of CO₂ can interfere with O₂ binding with haemoglobin

Answer

Low pCO₂ in alveoli favours the formation of oxyhaemoglobin

Question 3

Match the following columns and select the correct option.
List-I:
A. 6–15 pairs of gill slits
B. Heterocercal caudal fin
C. Air bladder
D. Poison sting
List-II:
I. Trygon
II. Cyclostomes
III. Chondrichthyes
IV. Osteichthyes
Choose the correct answer from the options given below:

Accepted Answer

A-II, B-III, C-IV, D-I

Answer

A-III, B-IV, C-I, D-II

Answer

A-IV, B-II, C-III, D-I

Answer

A-I, B-IV, C-III, D-II

Question 4

Match the following columns and select the correct option.
List-I:
A. Bt cotton
B. Adenosine deaminase deficiency
C. RNAi
D. PCR
List-II:
I. Gene therapy
II. Cellular defence
III. Detection of HIV infection
IV. Bacillus thuringiensis
Choose the correct answer from the options given below:

Accepted Answer

A-IV, B-I, C-II, D-III

Answer

A-III, B-II, C-I, D-IV

Answer

A-II, B-III, C-IV, D-I

Answer

A-I, B-II, C-III, D-IV

Question 5

Flippers of Penguins and Dolphins are examples of

Accepted Answer

Convergent evolution

Answer

Adaptive radiation

Answer

Industrial melanism

Answer

Natural selection

Question 6

Identify a molecule which does not exist.

Accepted Answer

He₂

Answer

Li₂

Answer

C₂

Answer

O₂

Question 7

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

Accepted Answer

collision frequency

Answer

activation energy

Answer

heat of reaction

Answer

threshold energy

Question 8

For the reaction, 2Cl(g) → Cl₂(g), the correct option is:

Accepted Answer

ΔᵣH < 0 and ΔᵣS < 0

Answer

ΔᵣH > 0 and ΔᵣS > 0

Answer

ΔᵣH > 0 and ΔᵣS < 0

Answer

ΔᵣH < 0 and ΔᵣS > 0

Question 9

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

Accepted Answer

π rad

Answer

3π/2 rad

Answer

π/2 rad

Answer

zero

Question 10

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

Accepted Answer

Curve rising slowly at first and then steeply (concave upward), from a small non-zero value

Answer

Straight line rising from a non-zero value

Answer

Curve falling steeply and levelling off

Answer

Curve falling slowly at first and then steeply

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