Let’s be honest: physics is the subject that can make or break your rank. Whether you are preparing for JEE, NEET, NDA, SSC or the Railway exams in 2027, a strong grip on physics gives you a real edge over the crowd.
The good news? You don’t need to solve 10,000 questions to get there. You need the right questions, practised regularly, with the concept clear in your head. That is exactly why we have put together these 100+ important physics questions with answers, covering mechanics, electricity and modern physics, plus the most-asked formulas and units from NEET and JEE.
Use this page for quick revision, daily practice or last-minute prep before a mock test. You can also download the free PDF at the end and keep it on your phone for revision anywhere.
Below, you will find 100+ important physics questions for competitive exams, with simple answers you can revise in minutes.
Why Physics Questions Practice is Important
Studying physics questions enables you to reach a full understanding of scientific principles. This helps you to enhance your ability to succeed in competitive assessments. Here are the reasons why physics practice questions are important:
Improve Concept Clarity
Practicing Physics Questions stems from its ability to assist you with your academic needs. You can clear your concept through physics practice.
Helps in Competitive Exams
If you practice physics problems, you must develop a complete understanding of concepts. Your understanding of fundamental concepts increases when you solve actual problems using theoretical knowledge.
Improves Problem-Solving Speed
Science subjects make up a significant part of NEE, JEE, SSC, NDA, and railway examinations. Your regular practice of solving physics multiple-choice questions enhances your exam performance. It leads to higher selection chances.
Most Important Physics Questions with Answers
If you practice JEE physics questions, it will help you improve your understanding of content. It leads to better memory retention.
Here are the essential physics sections which contain physics MCQ:
Mechanics Questions
- What is the SI unit of force?
Answer: Newton - What is acceleration due to gravity on Earth?
Answer: 9.8 m/s² - What is the unit of work?
Answer: Joule - What is momentum?
Answer: Momentum = Mass × Velocity - What is the SI unit of power?
Answer: Watt - What is inertia?
Answer: The tendency of an object to resist changes in its state of motion - What is velocity?
Answer: Speed with direction - What is the formula of kinetic energy?
Answer: KE = 1/2 mv² - What is potential energy?
Answer: Energy due to position - What is the unit of pressure?
Answer: Pascal - What is Newton’s First Law?
Answer: Law of inertia - What is impulse?
Answer: Impulse = Force × Time - What is uniform motion?
Answer: Equal distance covered in equal intervals of time - What is non-uniform motion?
Answer: Unequal distance covered in equal intervals of time - What is speed?
Answer: Distance/time - What is displacement?
Answer: Shortest distance between two points - What is the work formula?
Answer: W = F × d - What is energy?
Answer: Capacity to do work - What is mass?
Answer: Quantity of matter in a body - What is friction?
Answer: Force that opposes motion
Electricity Questions
- What is Ohm’s Law?
Answer: V = IR - What is the SI unit of current?
Answer: Ampere - What is resistance?
Answer: Opposition to the flow of current - What is voltage?
Answer: Potential difference between two points - What is the unit of resistance?
Answer: Ohm - What is electric power?
Answer: P = VI - What is a conductor?
Answer: Material that allows current to pass - What is an insulator?
Answer: Material that blocks current - What is the unit of electric charge?
Answer: Coulomb - What is a series circuit?
Answer: Same current flows through all components - What is a parallel circuit?
Answer: Same voltage across all branches - What is a fuse?
Answer: Safety device to protect circuits - What is a battery?
Answer: Source of electrical energy - What is capacitance?
Answer: Ability to store charge - What is an electric field?
Answer: Force per unit charge - What is current formula?
Answer: I = Q/t - What is EMF?
Answer: Energy per unit charge - What is a resistor?
Answer: Device that limits current - What is a short circuit?
Answer: Low resistance path between two points - What is the unit of power?
Answer: Watt
Modern Physics Questions
- Who discovered the electron?
Answer: J.J. Thomson - What is the photoelectric effect?
Answer: Emission of electrons due to light - Who proposed the atomic model?
Answer: Bohr - What is a nucleus?
Answer: Central part of an atom - What is proton charge?
Answer: Positive - What is neutron charge?
Answer: Neutral - What is electron charge?
Answer: Negative - What is radioactivity?
Answer: Emission of radiation - What is an isotope?
Answer: Same element with different mass numbers - What is half-life?
Answer: Time required for half decay - What is fission?
Answer: Splitting of nucleus - What is fusion?
Answer: Combination of nuclei - What is a photon?
Answer: Particle of light - What is Planck constant?
Answer: 6.626 × 10⁻³⁴ Js - What is X-ray?
Answer: High energy radiation - What is gamma ray?
Answer: Highest energy radiation - What is an alpha particle?
Answer: Helium nucleus - What is a beta particle?
Answer: Electron-like particle - What is quantum theory?
Answer: Energy exists in discrete packets - What is energy formula?
Answer: E = mc²
Physics Questions for NEET & JEE
Concept-based and numerical questions decide your rank in NEET and JEE. Learning definitions isn’t enough: you need to apply the formula, check the units and avoid silly mistakes. Start with the quick-revision questions, then move on to MCQs and numericals.
Here are important JEE and NEET physics questions to practise.
Part 1: Quick Revision Questions
- A body moves with constant velocity. What is its acceleration?
Answer: Zero - What is the force on a 2 kg mass with 3 m/s² acceleration?
Answer: F = ma = 2 × 3 = 6 N - What is the work done if the force is zero?
Answer: Zero - What is the momentum of a 5 kg body moving at 2 m/s?
Answer: p = mv = 5 × 2 = 10 kg·m/s - What is the kinetic energy of a 2 kg body moving at 3 m/s?
Answer: KE = ½mv² = ½ × 2 × 3² = 9 J
(m = mass, v = velocity) - What is the formula for potential energy?
Answer: PE = mgh
(m = mass, g = acceleration due to gravity, h = height above the ground) - What is the unit of gravitational force?
Answer: Newton (N) - What is the formula for electric current?
Answer: I = Q/t
(Q = charge, t = time) - What is the formula for voltage (Ohm’s Law)?
Answer: V = IR
(I = current, R = resistance) - What is the unit of resistance?
Answer: Ohm (Ω) - What is the formula for electric power?
Answer: P = VI - What is the unit of frequency?
Answer: Hertz (Hz) - What is the wave speed formula?
Answer: v = fλ
(f = frequency, λ = wavelength) - What is the formula for acceleration?
Answer: a = (v − u)/t
(u = initial velocity, v = final velocity, t = time) - What is the formula for work?
Answer: W = F × d × cosθ
(θ = angle between force and displacement. When force and displacement are in the same direction, W = F × d.) - What is the unit of energy?
Answer: Joule (J) - What is the formula for speed?
Answer: Speed = distance/time - What is the formula for density?
Answer: Density = mass/volume - What is the formula for pressure?
Answer: Pressure = force/area - What is the unit of heat?
Answer: Joule (J) - What is the speed of sound in air?
Answer: About 343 m/s (at 20°C) - What is the speed of light in vacuum?
Answer: 3 × 10⁸ m/s - What is the unit of capacitance?
Answer: Farad (F) - What is the unit of electric charge?
Answer: Coulomb (C) - What is the energy of a photon?
Answer: E = hν
(h = Planck’s constant = 6.626 × 10⁻³⁴ J·s, ν = frequency of radiation) - What is the work-energy theorem?
Answer: Net work done = change in kinetic energy - What is Newton’s second law?
Answer: F = ma
(F = force, m = mass, a = acceleration) - What is the unit of acceleration?
Answer: m/s² - What is the unit of power?
Answer: Watt (W) - What is the unit of electric field?
Answer: N/C (or V/m) - What is the unit of magnetic field?
Answer: Tesla (T) - What is the formula for resistance?
Answer: R = V/I - What is the unit of EMF?
Answer: Volt (V) - What is Einstein’s mass-energy relation?
Answer: E = mc² - What is the formula for frequency?
Answer: f = 1/T
(T = time period) - What is the unit of time period?
Answer: Second (s) - What is the lens formula?
Answer: 1/f = 1/v − 1/u
(Use the sign convention carefully. Many students lose marks here.) - What is the mirror formula?
Answer: 1/f = 1/v + 1/u - What is the unit of momentum?
Answer: kg·m/s - What is the unit of impulse?
Answer: N·s (same as kg·m/s) - What is the unit of density?
Answer: kg/m³ - What is the formula for heat?
Answer: Q = mcΔT
(m = mass, c = specific heat capacity, ΔT = change in temperature) - What is the formula for efficiency?
Answer: Efficiency = (output/input) × 100 - What is the acceleration due to gravity on Earth?
Answer: 9.8 m/s² (taken as 10 m/s² in many numericals) - What is the law of conservation of energy?
Answer: Energy can neither be created nor destroyed, only converted from one form to another.
Part 2: MCQs (NEET & JEE Level)
Q1. A ball is thrown vertically upward. At the highest point, its velocity and acceleration are:
(a) 0 and 0
(b) 0 and 9.8 m/s² downward
(c) 9.8 m/s and 0
(d) 9.8 m/s upward and 9.8 m/s² downward
Answer: (b). Velocity becomes zero for a moment, but gravity keeps acting.
Q2. Which of the following is NOT a vector quantity?
(a) Displacement
(b) Velocity
(c) Force
(d) Speed
Answer: (d). Speed has magnitude only.
Q3. If the velocity of a body is doubled, its kinetic energy becomes:
(a) 2 times
(b) 4 times
(c) Half
(d) Same
Answer: (b). KE ∝ v².
Q4. The dimensional formula of work is:
(a) MLT⁻²
(b) ML²T⁻²
(c) ML²T⁻³
(d) MLT⁻¹
Answer: (b).
Q5. The time period of a simple pendulum depends on:
(a) Mass of the bob and length
(b) Length and acceleration due to gravity
(c) Mass of the bob only
(d) Amplitude only
Answer: (b). T = 2π√(l/g). Mass doesn’t matter.
Q6. The escape velocity from the Earth’s surface is approximately:
(a) 7.9 km/s
(b) 9.8 km/s
(c) 11.2 km/s
(d) 15 km/s
Answer: (c).
Q7. Two resistors of 4 Ω each are connected in parallel. The equivalent resistance is:
(a) 8 Ω
(b) 4 Ω
(c) 2 Ω
(d) 1 Ω
Answer: (c). 1/R = 1/4 + 1/4 = 1/2, so R = 2 Ω.
Q8. The SI unit of magnetic flux is:
(a) Tesla
(b) Weber
(c) Henry
(d) Gauss
Answer: (b).
Q9. Energy stored in a 2 μF capacitor charged to 10 V is:
(a) 1 × 10⁻⁴ J
(b) 2 × 10⁻⁴ J
(c) 1 × 10⁻⁵ J
(d) 2 × 10⁻⁵ J
Answer: (a). U = ½CV² = ½ × 2 × 10⁻⁶ × 100 = 1 × 10⁻⁴ J.
Q10. A convex lens has a focal length of 50 cm. Its power is:
(a) +0.5 D
(b) +2 D
(c) −2 D
(d) +5 D
Answer: (b). P = 1/f (in metres) = 1/0.5 = +2 D.
Q11. The photoelectric effect supports which nature of light?
(a) Wave nature
(b) Particle nature
(c) Both equally
(d) Neither
Answer: (b). Light behaves as photons here.
Q12. A radioactive sample of 80 g has a half-life of 10 days. How much remains after 30 days?
(a) 40 g
(b) 20 g
(c) 10 g
(d) 5 g
Answer: (c). 30 days = 3 half-lives, so 80 → 40 → 20 → 10 g.
Q13. Which mode of heat transfer does NOT need a medium?
(a) Conduction
(b) Convection
(c) Radiation
(d) All of these
Answer: (c).
Q14. Lenz’s law is a consequence of the conservation of:
(a) Charge
(b) Momentum
(c) Energy
(d) Mass
Answer: (c).
Q15. Which of these is dimensionless?
(a) Refractive index
(b) Pressure
(c) Frequency
(d) Density
Answer: (a).
Part 3: Numerical Practice
(Take g = 10 m/s² wherever needed.)
N1. A car starts from rest and accelerates at 2 m/s² for 5 seconds. Find its final velocity and the distance covered.
Answer: v = u + at = 0 + 2 × 5 = 10 m/s. s = ½at² = ½ × 2 × 25 = 25 m.
N2. A ball is dropped from a height of 20 m. How long does it take to reach the ground, and with what speed does it hit?
Answer: t = √(2h/g) = √(40/10) = 2 s. v = gt = 20 m/s.
N3. How much work is done in lifting a 5 kg block through 4 m?
Answer: W = mgh = 5 × 10 × 4 = 200 J.
N4. A 10 Ω resistor is connected across a 20 V battery. Find the current and the power consumed.
Answer: I = V/R = 2 A. P = VI = 20 × 2 = 40 W.
N5. How much heat is needed to raise the temperature of 2 kg of water by 10°C? (c = 4200 J/kg·°C)
Answer: Q = mcΔT = 2 × 4200 × 10 = 84,000 J.
N6. A wave has a frequency of 500 Hz and a wavelength of 0.68 m. Find its speed.
Answer: v = fλ = 500 × 0.68 = 340 m/s.
N7. An object is placed 30 cm in front of a convex lens of focal length 10 cm. Find the image distance.
Answer: Taking u = −30 cm and f = +10 cm: 1/v = 1/f + 1/u = 1/10 − 1/30 = 2/30, so v = +15 cm (real image).
N8. A constant force of 10 N acts on a 2 kg body (initially at rest) for 3 seconds. Find the impulse and the final velocity.
Answer: Impulse = F × t = 30 N·s. v = impulse/m = 30/2 = 15 m/s.
100 Important Physics Questions PDF
Easy Tricks to Solve Physics Questions Faster:
The correct techniques enable you to solve physics problems with greater speed and better efficiency. Here are some easy physics tricks to solve Physics questions faster:
- Learn all important formulas and revise them regularly.
- Practice previous year physics questions for competitive exams daily.
- Focus on understanding concepts instead of rote learning.
- Solve physics numerical problems every day to improve speed.
- Use physics shortcuts and methods for calculations wherever possible.
- Analyze your mistakes after solving mock tests.
- Maintain a formula sheet for quick revision.
Common Mistakes Students Make in Physics:
Many students lose marks because they make physics preparation mistakes. Here are some common physics study mistakes students make in Physics:
- Memorizing formulas without understanding concepts.
- Ignoring units while solving problems.
- Not practicing enough numerical questions.
- Skipping revision of important topics.
- Not analyzing mistakes in mock tests.
- Rushing through questions without reading properly.
- Avoiding difficult topics instead of practicing them.
Conclusion:
To get success, you should conduct repeated practice of essential physics questions and answers. Your understanding of concepts will improve while your confidence level will rise and your capacity to solve problems will increase. Consistent practice of physics MCQ helps you achieve better results in your competitive exams like NEET and JEE examinations.
To achieve top scores, you combine concept learning with regular question practice. To enhance your study process you should keep practicing and maintaining your current activities while you investigate additional physics practice materials. Practice more and give your best. All the best!
