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NEET UG Physics — practice by topic

Browse 3,449 questions across 60 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Electric Charges and Fields (189)Moving Charges and Magnetism (180)Ray Optics and Optical Instruments (170)Semiconductor Electronics (169)Current Electricity (163)Dual Nature of Radiation and Matter (161)Kinetic Theory & Oscillations (141)System of Particles and Rotational Motion (139)Thermal Properties of Matter & Thermodynamics (134)Gravitation (126)Laws of Motion (117)Electromagnetic Induction & Alternating Current (116)Nuclei (102)Mechanical Properties of Solids and Fluids (97)Units and Measurement (92)Electromagnetic Waves (90)Wave Optics (87)Atoms (82)Semiconductor Electronics: Materials, Devices and Simple Circuits (80)Atoms and Nuclei (79)Work, Energy and Power (79)Unit 2B: Friction, Gravitational and Normal Forces (78)Motion in a Plane (76)Magnetism and Matter (61)Unit 1B: Kinematics: 2D Motion & Projectiles (51)Waves (51)Unit 3A: Work and Kinetic Energy Theorem (47)Electromagnetic Induction (44)Experimental Skills (43)Units, Measurements and Motion in a Straight Line (41)Unit 1C: Kinematics: Relative & Circular Motion (33)Electrostatic Potential and Capacitance (30)Energy Transfer in Systems (29)Potential and Kinetic Energy (29)Systems of Particles and Rotational Motion (28)Newton's Laws of Motion (27)Thermodynamics & Kinetic Theory (27)Physics and Measurement (23)Electromagnetism (22)Semiconductors (21)Modern Physics (20)Waves & Oscillations (20)Magnetism (18)Ray Optics (17)Magnetism & EMI (15)Kinetic Theory (14)States of Matter (14)Mechanics (13)Electrostatics (10)Equipotential Surfaces (10)Static Electricity (10)Alternating Current (5)Ray and Wave Optics (5)Dual Nature of Matter (4)Force, Pressure & Fluids (4)Kinetic Theory of Gases (4)Optics (3)Physics (2)Calorimetry (1)Rotational Motion (1)

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The relation between focal length f and radius of curvature R for a spherical mirror is:Read the answer and worked solution →The mirror equation (relating object distance u, image distance v, focal length f) is:Read the answer and worked solution →The linear magnification produced by a spherical mirror is given by:Read the answer and worked solution →A convex (diverging) mirror always forms an image that is:Read the answer and worked solution →

Worked practice questions

The relation between focal length f and radius of curvature R for a spherical mirror is:

  1. f = R
  2. f = 2R
  3. f = R/2 (paraxial approximation)
  4. f = R/4
Show answer and solution

Correct answer: C. f = R/2 (paraxial approximation)

For a spherical mirror under the paraxial approximation, **f = R/2**. Concave (converging) has positive R/2 in magnitude sign depends on convention (f negative in Cartesian convention for a concave mirror with its centre of curvature on the object side).

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The mirror equation (relating object distance u, image distance v, focal length f) is:

  1. 1/u + 1/v = 1/f
  2. 1/v − 1/u = 1/f
  3. v/u = f
  4. u + v = f
Show answer and solution

Correct answer: A. 1/u + 1/v = 1/f

**Mirror equation: 1/v + 1/u = 1/f** (Cartesian sign convention). All three quantities take signs per the convention. Magnification m = −v/u.

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The linear magnification produced by a spherical mirror is given by:

  1. m = u/v
  2. m = −v/u (with sign convention)
  3. m = v × u
  4. m = f/u
Show answer and solution

Correct answer: B. m = −v/u (with sign convention)

**Magnification m = h'/h = −v/u**. **Sign of m tells about image orientation:** **negative m → inverted image (real) positive m → erect image (virtual)**.

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