NEET UG 2026: Full Question Paper (Physics, Chemistry & Biology)
Exclusively Compiled by Home Academy
Physics Section
Q13. In Young's double slit experiment, using monochromatic light of wavelength \lambda, the intensity of light at a point on the screen where the path difference is \lambda is K units. The intensity of light at a point where the path difference is \lambda/3 will be:
(1) K/4
(2) K
(3) K/2
(4) 2K
Solution: = K/4.
Correct Option: (1)
Q14. The magnitude and direction of the acceleration produced in a body of mass 5 kg when two mutually perpendicular forces 8 N and 6 N act on it, are respectively:
(1) 2 \text{ m/s}^2, \tan^{-1}(3/4) with 6 N force
(2) 2 \text{ m/s}^2, \tan^{-1}(4/3) with 8 N force
(3) 2 \text{ m/s}^2, \tan^{-1}(3/4) with 8 N force
(4) 20 \text{ m/s}^2, \tan^{-1}(4/3) with 8 N force
Solution: Resultant force F = \sqrt{8^2 + 6^2} = 10 \text{ N}. Acceleration a = F/m = 10/5 = 2 \text{ m/s}^2. Direction \theta = \tan^{-1}(6/8) = \tan^{-1}(3/4) with the 8 N force.
Correct Option: (3)
Chemistry Section
Q45. A flask contains argon and chlorine in the ratio of 2:1 by mass. The temperature of the mixture is 27^\circ\text{C}. The ratio of root mean square speed of the molecules of the two gases is:
(Atomic mass of Ar = 40, Cl = 35.5 \rightarrow Cl_2 = 71)
(1) \frac{\sqrt{7}}{2}
(2) \frac{7}{2}
(3) \frac{2}{7}
(4) \sqrt{\frac{71}{40}}
Solution: v_{rms} = \sqrt{\frac{3RT}{M}}. Since T is same, v_{rms} \propto \frac{1}{\sqrt{M}}.
Ratio = \sqrt{\frac{M_{Cl2}}{M_{Ar}}} = \sqrt{\frac{71}{40}} \approx \sqrt{\frac{7}{4}} (using simplified 70/40).
Correct Option: (4)
Q52. In the following reaction sequence, X and Z are:
CH_3CH_2-OH + PCl_5 \rightarrow CH_3CH_2Cl + X + HCl
X \xrightarrow{\text{alc. KOH, }\Delta} Y \xrightarrow{HBr} Z
(1) X = POCl_3; Z = CH_3-CH(Br)-CH_3
(2) X = H_3PO_3; Z = CH_3CH_2-Br
(3) X = H_3PO_3; Z = CH_3-CH(Br)-CH_3
(4) X = POCl_3; Z = CH_3CH_2-Br
Solution: Ethanol with PCl_5 gives Ethyl chloride (CH_3CH_2Cl) and POCl_3 (X). Ethyl chloride with alcoholic KOH undergoes dehydrohalogenation to give Ethene (Y). Ethene with HBr gives Ethyl bromide (Z).
Correct Option: (4)
Biology Section
Q108. Find the incorrect statement(s) about photosynthesis from the following:
A. The water splitting complex is associated with PS II.
B. C_4 plants use the C_3 pathway of CO_2 fixation as the main biosynthetic pathway.
C. In C_4 plants, photorespiration does not occur.
D. C_3 plants exhibit 'Kranz' anatomy.
E. ATP synthesis in chloroplast occurs through chemiosmosis.
(1) B only
(2) A and D only
(3) B and C only
(4) D only
Solution: C_3 plants do not exhibit Kranz anatomy; this is a characteristic of C_4 plants like Maize and Sorghum.
Correct Option: (4)
Q125. In the lac operon, the z gene codes for:
(1) transacetylase
(2) the repressor of lac operon
(3) permease
(4) beta-galactosidase
Solution: In the Lac operon, the 'z' gene codes for \beta-galactosidase, 'y' for permease, and 'a' for transacetylase.
Correct Option: (4)
Home Academy Analysis
This paper reflects a shift towards multi-statement and assertion-reason type questions. For candidates preparing for the next session:
- Physics: Focus on circuit diagrams and wave optics.
- Chemistry: Practice reaction mechanisms for organic conversions.
- Biology: Memorize enzyme functions and anatomical differences in plants.