BITSAT Physics 2025 Most Important Topics and Questions

BITSAT Physics 2025 Most Important Topics and Questions: There are certain topics in BITSAT 2025 Physics that usually play a big role due to higher weightage, and should be studied seriously to achieve better scores.About 20-25% of the Physics questions in the Mechanics part of the exam focus on Laws of Motion, Work and Energy, and Rotational Motion. Topics like Coulomb’s Law, Electric Field, Gauss’s Law, Capacitance, Magnetic Effect of Current, Ampere’s Law, and the Lorentz Force together take up between 20% and 27% of the questions. Kinetic theory and the laws of thermodynamics from Heat and Thermodynamics chapter covers more or less 10-12% of questions in the exam paper. About 8-10% of the paper deals with optics, which covers questions on lenses, mirrors, interference, and diffraction. In the syllabus, the topics related to modern physics such as the photoelectric effect, atomic models, and radioactivity, covers 12-15% weightage of the question paper. Some additional topics that students shouldn't miss out are, Oscillations and Waves, Ohm’s Law, Kirchhoff’s Laws in current electricity, semiconductors, and logic gates in electronic devices.

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BITSAT Physics 2025 Most Important Topics

Students can check below majority of important topics for BITSAT Physics 2025 exam. These topics carry higher weightage and more number of questions in the exam. Missing out on these topics can lead to lower marks in the test.

Very High Weightage Topics

• Heat & Thermodynamics (10%)
• Magnetic Effect of Current & Magnetism (9–10%)
• Mechanics (including Kinematics, Newton’s Laws, Work, Power & Energy, Rotational Motion, Gravitation, etc.) (Approx. 20% collectively)
• Electrostatics (8–9%)
• Current Electricity (6–8%)

High Weightage Topics

• Optics (Ray Optics & Wave Optics combined) (4–6%)
• Waves and Sound (including Wave Motion) (5–6%)
• Simple Harmonic Motion (5–6%)
• Fluid Mechanics/ Properties of Matter and Fluids (5–6%)
• Modern Physics (Atomic, Nuclear) (6-7%)

Moderate Weightage Topics

• Rotational Motion (4–5%)
• Work, Power & Energy (4%)
• Elasticity (3–4%)
• Gravitation (3–4%)
• Alternating Current (2–3%)
• Units, Dimensions, and Errors (2–4%)

BITSAT Physics 2025 Most Expected Questions

In this section, students will find 15 most expected questions from BITSAT Physics 2025:

1. The radius R of the soap bubble is doubled under isothermal condition. If T be the surface tension of soap bubble, the work done in doing so is given by:

a) 32πR ² T
b) 24πR ² T
c) 8πR ² T
d) 4πR ² T

2. A very narrow capillary tube records a rise of 20 cm when dipped in water. When the area of cross-section is reduced to one-fourth of former value, water will rise to a height of:

(a) 10 cm
(b) 20 cm
(c) 40 cm
(d) 80 cm

3. The atmospheric pressure at the surface of a lake of depth h is P _o . If the pressure at half the depth of the lake is equal to 2/3 of the pressure at the bottom of the lake, then the depth (h) of the lake is:

(a) 10 m
(b) 20 m
(c) 60 m
(d) 30 m

4. An ideal gas is expanding such that pT² = constant. The coefficient of volume expansion of the gas is

(A)1/T
(B) 2/T
(C) 3/T
(D) 4/T

5. A sphere of mass m and radius r is projected in a gravity free space with speed v. If coefficient of viscosity of the medium in which it moves is 1/6π, before body stops what is the distance travelled:

(A)mv/2r
(B) 2mv/r
(C) mv/r
(D) mv/4r

6. A pipe closed at one end has length 83 cm. The number of possible natural oscillations of air column whose frequencies lie below 1000 Hz are (velocity of sound in air = 332 m s ^- ¹)

(A) 3
(B) 4
(C) 5
(D) 6

7. During an adiabatic process, if the pressure of an ideal gas is proportional to the cube of its temperature, the ratio γ= C _P /C _V is (C _p, C _v are specific heats at constant pressure and volume)

a) 3/5
b) 4/3
c) 5/3
d) 3/2

8. A galvanometer of resistance 50 Ω is converted into an ammeter by connecting a low resistance (shunt) of value 1 Ω in parallel to the galvanometer, S. If full-scale deflection current of the galvanometer is 10 mA, then the maximum current that can be measured by the ammeter is -

(a) 500 mA
(b) 510 mA
(c) 610 mA
(d) 490 mA

9. Find equivalent resistance between two ends of the following circuit



(a) r
(b) r/6
(c) r/3
(d) r/9

10. A 2 kg brick begins to slide over a surface which is inclined at an angle of 45 ^o with respect to horizontal axis. The co-efficient of static friction between their surfaces is:

A) 1
B) 1.7
C) 0.5
D) 1/√3

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Subject	Important Links
Physics	BITSAT 2025 Physics Expected Difficulty Level
Chemistry	BITSAT 2025 Chemistry Expected Difficulty Level
	BITSAT Chemistry 2025 Most Important Topics and Questions
Mathematics	BITSAT 2025 Mathematics Expected Difficulty Level
	BITSAT Mathematics 2025 Most Important Topics and Questions

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