JEE Main March 2021 question paper OUT; check paper analysis, sample papers, and other details

The JEE Main March 2021 exam was held from 16th-18th March. The JEE Main 2021 will be conducted in two more shifts in the month of April and May. The question paper for the February shift has been released on the NTA website. The JEE Main March 2021 question paper for shifts 1 and 2 has also been released by several coaching institutes. The links for the question papers have been provided for download.  

JEE Main March 2021: Question paper with answers

JEE Main March 2021 example questions

JEE Main March 2021: 16th-18th March, Chemistry 

1. Assertion : Acetone exists in enolic form < (0.15%) but acetyl acetone predominantly exists enolic form (>15%).

Reason: H-bonding in enolic form in acetyl acetone favour it while it is absent in acetone.

1. Assertion is correct but reason is wrong  
2. Both assertion and reason are correct and reason is correct explanation of assertion
3. Both assertion and reason are correct but reason is not correct explanation of assertion  
4. Assertion is wrong but reason is correct. 

Ans. 2

2. Antihistamines are  

1. Antacid and Anti allergic 
2. Antacid and analgesic 
3. Anti allergic and analgesic 
4. Antipyretic and disinfectants. 

Ans. 1

Q. Which vitamins are stored in the body for a longer time?

1. Thiamine and A 
2. Vitamin D & A 
3. Ascorbic acid and thiamine 
4. Ascorbic acid and D 

Ans. 2

Q. Chromatography is not affected by which of the following?

1. Solubility of compound
2. Mobility of solvent  
3. Length of column   
4. State of pure compound   

Ans. 4

Q. Sulphur can be removed from ores by

1. Roasting
2. Leaching
3. Smelting
4. Refining

Ans. 1

Q. Determine molarity of 6.5 molal KOH solution having density 1.89 g/ml.

Ans. 9

Q. S-1 : H2O2 can act both as oxidising and reducing agent in basic medium.

  S-2 : In the hydrogen economy, energy is stored in the form of di-hydrogen.  

1. Only S-1 is true 
2. Only S-2 is true 
3. S-1 and S-2 both are true 
4.  S-1 is true and S-2 is incorrect 

Ans. 3

Q. A particular element crystallises in both BCC & simple cubic lattice. Determine edge length of cubic close packing unit cell if edge length of BCC unit cell is 27 Å.

Ans. 33 

Q. Wooden laminates are made by

1. Urea–formaldehyde resin
2.  Melamine–formaldehyde resin
3.  Phenol–formaldehyde resin
4. PVC

Ans. 2

Q. Ammonolysis of alkyl halide to prepare primary, secondary and tertiary amines followed by NaOH is

1. to remove acidic impurities
2. to remove basic impurities
3. to activate halide
4. to activate ammonia

Ans. 1

Q. Secondary structure of protein in stabilized by

1. H-bond
2. Vanderwaal force of attraction
3. Peptide bond
4. Glycosidic linkage

Ans. 1

Q. Elements with atomic number 33, 53 & 83 are respectively

1. Metalloid, Non-metal, Metal
2. Metalloid, Non-metal, Metal
3. Non-metal, Metal, Metalloid
4. Metalloid, Metal, Non-metal

Ans. 1

Q. Incorrect statement regarding C60 is: 

1.  It has 24 6-membered rings & 12 5-membered rings.
2.  It has 5-membered rings only attached to 6-membered rings.
3. It has 6-membered rings attached to both 5 & 6-membered rings. 
4.  Each Carbon is attached to 3 C-atoms. 

Ans. 1

JEE Main March 2021: 16th-18th march, Physics

Q. In a pure inductive circuit effect on reactance and current when frequency is halved

1.  reactance will be doubled and current will be halved
2.  current will be doubled and reactance will be halved. 
3.  both doubled 
4.  both halved 

Ans. 2

Q. Visible light is found in which spectrum

1. Lyman series
2. Balmer series
3. Pashen series
4.  Pfund series 

Ans. 2

Q. If a simple pendulum completes 200 oscillations in 100 sec, the least count of the watch is 1 sec., length of a simple pendulum is 100 cm and its least count is 1 mm then find the max. the possible percentage error in measuring acceleration due to gravity.

1. 3.2
2. 5.2
3. 2.1
4. 4.1 

Ans. 3

Q. A girl is looking at the distant rectangular window, she finds the window to be blurred & nonuniformly curved. What eye defect she may have?

1. Myopia & Astigmatism
2. Myopia & Hypermetropia
3. Astigmatism
4. Hypermetropia & Astigmatism

Ans. 1

Q. A satellite revolves in a circular orbit of radius R around the earth with time period T. Find its time period if it starts revolving in radius 9R? 

1. 3T
2. 6T
3. 9T
4. 27T

Ans. 4

Q. In LCR circuit L and C are constant and R is increased then: 

1. Quality factor and resonant frequency both are unchanged.
2. Quality factor is increased.
3. Band width is increased.
4. Quality factor remains unchanged.

Ans. 3

Q. A closed current-carrying loop is placed in a uniform magnetic field. Then in equilibrium shape of wire will be:

1.  Straight
2.  Unchanged
3. Circular and plane perpendicular to the magnetic field
4. Circular and plane parallel to the magnetic field

Ans. 3

Q. A man is swimming in a river at an angle 120º with river flow. Speed of the man in still water is 10m/s. If he reaches the other bank exactly opposite to the origin point, find the speed of flow of the river (in m/s).

Ans. 5.00

Q. Work and heat are:

1. Path function
2. Path function
3. Extensive function
4. Intensive function

Ans. 1

Q. In photoelectric effect stopping potential for electromagnetic radiations depends on

1.  Amplitude
2. Intensity
3. Phase
4. Frequency

Ans. 4

Q. An antenna of length 25 m is mounted on top of a building of height 75 m. Then the maximum wavelength of the transmission signal is close to:

1. 100 m
2. 200 m
3. 300 m
4. 400 m

Ans. 1

Q. A bar magnet of length 14 cm is placed along N-S direction with north of magnetic along the north direction. If the horizontal component of the earth magnetic field is 0.4 G. If at a distance of 18 cm from the center of the magnet a null point is located. Then the magnetic moment of a magnet is (in AM^2):

1. 2.88
2. 1.88
3. 4.88
4. 4.88

JEE Main March 2021 paper analysis

This year’s JEE Main March 2021 paper was made with a focus on NCERT. Many students felt that the physics paper was difficult, while the mathematics section was of moderate difficulty level. The overall difficulty level was also moderate. Check the full analysis here.

JEE Main sample papers

There are still two sessions left for the JEE Main 2021 exam. It’s important to stay abreast with the previous year's questions and sample papers to boost your preparation. Check previous year questions and sample papers here. 

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