CSIR NET December 2025 Answer Key: The National Testing Agency (NTA) has successfully conducted on December 18 across 225 cities in computer-based mode for the Joint CSIR-UGC NET Examination for December 2025. CSIR NET December 2025 examined Life Sciences in the morning (9:00 AM-12:00 Noon) and Chemical, Mathematical, Physical, and Earth Sciences in the afternoon (3:00 PM-6:00 PM), with each examination lasting 180 minutes and included multiple-choice questions. Provisional keys for each topic are available at csirnet.nta.ac.in and may be downloaded using the application number and DOB.

Candidates who appeared for the CSIR NET December 2025 exam on December 18, 2025, can soon download the provisional answer key and response sheet from the official website csirnet.nta.ac.in. The National Testing Agency (NTA) is planned to issue the answer key around the third week of December 2025. Check out the direct download link, objection fee details (INR 200 per question) and marking system changes here.

CSIR NET December 2025 Overview

CSIR NET December 2025 

The CSIR NET December 2025 examination is a crucial eligibility test for Junior Research Fellowship (JRF) and Lectureship (LS)/Assistant Professor roles in Indian universities. The exam was conducted in Computer Based Test (CBT) mode for five broad subject categories: Chemical Sciences, Earth, Atmospheric, Ocean and Planetary Sciences, Life Sciences, Mathematical Sciences, and Physical Sciences.

CSIR NET December 2025 Answer Key Download Links 2025

Step to download CSIR NET December 2025 Answer Key 

Follow the detailed steps below to access your key and response sheet:

Step 1: Open your web browser and visit the official website of CSIR NET: **https://csirnet.nta.ac.in**.

Step 2: On the homepage, locate the “Candidate Activity” section.

Step 3: Look for the link titled “CSIR NET December 2025 Answer Key & Response Sheet” and click on it.

Step 4: You will be redirected to a login page. Select one of the two login options:

• Login through Application Number and Password.
• Login through Application Number and Date of Birth.

Step 5: Enter your credentials accurately, along with the Security Pin (Captcha) displayed on the screen.

Step 6: Once logged in, you will see your dashboard. Click on the “View Question Paper” link to see your responses and the “View/Challenge Answer Key” link to see the official correct answers.

Step 7: Download both the Question Paper (Response Sheet) and the Answer Key PDF. Save them on your device for future reference.

Raise Objection For CSIR NET December 2025 Answer Key 

Step 1: Log in to the official website csirnet.nta.ac.in using your Application Number and Date of Birth.

Step 2: Click on the link “View/Challenge Answer Key”.

Step 4: If you wish to challenge this option, you may use any one or more of the Option IDs given in the next four columns by clicking the check box.

Step 5: After clicking your desired option, scroll down and click on ‘Save your Claim’ and move to the next screen.

Step 6: You will be required to upload supporting documents.

Step 7: Pay the processing fee of INR 200 per question. 

Step 8: Submit the challenge and print the confirmation receipt.

How to Calculate Marks through the CSIR NET December 2025 Answer Key?

To calculate your score, you need your Response Sheet and the Provisional Answer Key.

Match the Question IDs: Ensure you are looking at the same question in both documents.

Check the Option IDs: Compare the Option ID you selected (from Response Sheet) with the Correct Option ID (from Answer Key).

Add Marks: For every match, add the full marks assigned to that section (e.g., +2 for Part A/B, +4 for Part C).​

Deduct Marks: For every mismatch (incorrect answer), deduct the negative marking amount (e.g., 0.5 for Part A/B, 1.0 for Part C).

Ignore Unattempted: Do not add or deduct marks for questions you did not answer.

Formula: Total Score = (Number of Correct Answers × Marks per Question) – (Number of Incorrect Answers × Negative Marking).

CSIR NET December 2025 2025 Marking Scheme

Understanding the marking scheme is crucial for calculating scores. The CSIR NET exam is divided into three parts: Part A (General Aptitude), Part B (Subject-related traditional MCQs), and Part C (Higher value questions that assess scientific ideas).

In all areas, wrong responses will result in negative marking. The weightage varies per topic (Life Sciences, Chemical Sciences, etc.), however incorrect answers result in a 25% loss from the allocated marks.

General Marking Scheme (Life Sciences Example):