JEE Main 2026 Question Paper, Answer Key LIVE: Jan 28, Shift 1 and Shift 2 Memory Based Questions and Solutions, Download PDF

Q. A bi-convex lens of refractive index 1.5 and planoconcave lens of refractive index 1.7 have the same magnitude of power. If 2nd radius of curvature of convex lens is equal to radius of curvature of planoconcave lens. Find ratio of 1st radius of curvature to 2nd radius of curvature of bi-convex lens.

Options:

1. 3/2
2. 5/2
3. 4
4. 3/4

Answer: (2)

Blank paper sheets for rough work of A4 size will be provided in the JEE Mains exam hall tomorrow.

Important instructions for candidates:

1. Candidates must write their name and Roll Number at the top of each of the sheets.
2. After the exam, they must drop the sheets in the designated drop box without fail, before leaving the exam hall. 

Q. Choose the correct statements in respect of hydrides of Group-15.

A. Reducing power increasing down the group.

B. Basic nature increases down the group.

C. Stability decreases down the group.

D. Boiling point decreases regularly down the group.

Options:

1. A,B and C only
2. A,B and D only
3. A, and C only
4. B, C and D only

Answer: (3)

Q. A tap is at a height of 5 m from ground. Water drops are falling from it at regular intervals. When the 1st drop hits the ground, the 6th droplet is just about to fall. Find the height of the 4th droplet from ground when the 1st droplet hits the ground.

Option:

1. 4.2m
2. 3.2m
3. 4m
4. 3m

Answer: (1)

Q. If 3 balls are taken from the box without replacement and found to be all black. If all configuration of red balls and black balls are equally likely then the probability that box contained 1 red and 9 black ball is p/q for some coprime natural number p and q then, p + q is

Options:

1. 59
2. 69
3. 57
4. 79

Answer: (2)

Q. In period 4 of the periodic table which elements have the lowest and highest atomic radii respectively

Options:

1. k and Br

2. Na and Cl

3. K and Se

4. Rb and Br

Answer: (1)

Q. Consider 10 observations 2,3,5,10,11,13,15,21,a, and b such that mean of observation in 9 and variance is 34.2. Then the mean deviation about median is 

Options:

1. 3

2. 5

3. 6

4. 7

Answer: (2)

Q. In carius method of estimation, of 'Br', 1.53g of an organic compound gave 1g AgBr. The percent of Br in organic compound is, (Atomic Mass of Ag, Br= 108, 80 u respectively).

Options:

1. 35.23

2. 43.53

3. 27.81

4. 22.71

Answer: (3)

• In maths, questions came from 3d and vectors
• In chemistry, questions were asked about coordination compounds, d-block
• In physics, questions came from ray optics, electrostatics, semiconductors, current electricity

The National Testing Agency (NTA) will release the official JEE Main 2026 answer key on its official website shortly after the conclusion of the January session. This official key will provide accurate solutions to all the questions asked in the JEE Main exam. Several coaching institutes have released the unofficial answer keys for the JEE Main 2026 exam online. Candidates can refer to this article to find the unofficial solutions for the JEE exam. By using these answer keys, candidates can evaluate their scores for the January session of JEE Main. The NTA is conducting the JEE Main 2026 exam from January 21 to January 29, 2026.

The JEE Main 2026 Paper 1 followed the standard NTA exam structure:

• Subjects: Physics, Chemistry, Mathematics

• Total Questions: 75 (25 from each subject)

• Total Marks: 300

• Marking Scheme:

• +4 marks for each correct answer

• –1 mark for each incorrect answer

• No marks deducted for unattempted questions

Each subject consisted of a mix of multiple-choice and numerical value-based questions, testing both conceptual clarity and problem-solving skills.