NEET

The entire range of electromagnetic radiation, arranged to increase and decrease the wavelength is called the electromagnetic (EM) spectrum. In the following order, it includes - radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All these regions have unique properties and applications. For example, X-rays used in medical imaging,  visible light in everyday vision, infrared in remote controls and thermal imaging and radio waves are used in communication. This is an important concept that helps in classifying and utilizing different EM waves.

The NEET OMR sheet is the answer sheet wherein candidates mark their responses during the exam. The NEET provisional answer key contains the correct answers to all the questions asked in the exam. The NTA releases the NEET answer key after the exam along with the copy of OMR sheets of candidates.

The NEET 2025 OMR response sheet was released on June 3, 2025. Within this, candidates can check their OMR sheets or response sheets where they had marked answers in. In case of any discrepancy on the response sheet, candidates could submit obections or challenges to NTA by June 5, 2025, 11.50 PM. Along with the OMR sheet, NTA also released the provisional NEET answer keys. Candidates could submit objections against either or both documents. They could also calculate the estimated scores by crosschecking their responses on the NEET OMR sheet and the answer keys.

NTA released the NEET 2025 provisional answer key on June 3, 2025. The last date to submit objections was June 5, 2025. Till 2023, NTA used to release the provisional answer keys in the first week of June, within a month of conducting NEET exam. Last year, NTA released it in the fourth week of May. Along with the provisional anwer keys, NTA will also release candidates' OMR response sheets. Candidates may challenge either or both within the stipulated schedule by paying the requisite fee.  

The NEET 2025 question paper was divided into four sets, 45, 46, 47 and 48. Unlike previous years, the NEET 2025 question paper sets were not alphanumeric but this year, the sets were only numeric. Moreover, till last year, a total of 24 question paper sets were given, as there were six subsets of each set. For example, NEET question paper set A had six subsets, A1, A2, A3.A6, and so on. However, this year, there were only four sets and no subsets. 

The net magnetic flux through any closed surface is zero, according to Gauss's Law for magnetism.
Mathematically,
? B · dA = 0.
It states that all magnetic field lines that enter a surface must exit from it as well. In this way, it is different from the electric charges which can exist independently as positive and negative.

The Earth's magnetic field makes a magnetic inclination or dip with the horizontal plane at a particular location. It shows how much the magnetic field is tilted from the horizontal. It gets tilted due to the Earth's magnetic nature. The formula is:
tan I = B_V / B_H,
where B_V is the vertical component and B_H is the horizontal component of the Earth's magnetic field.

The angle between the magnetic north (the direction a compass points) and the geographic north (true north) is the magnetic declination. This angle can change over time due to changes in the Earth's magnetic field and varies with location on Earth. It is important for navigation where accurate directional orientation is crucial, especially in marine and aviation transport. The declination helps in avoiding navigational errors as it ensures that compass readings are corrected.

The Earth's magnetic field makes a magnetic inclination or dip with the horizontal plane at a particular location. It shows how much the magnetic field is tilted from the horizontal. It gets tilted due to the Earth's magnetic nature. The formula is:
tan I = B_V / B_H,
where B_V is the vertical component and B_H is the horizontal component of the Earth's magnetic field.