JEE Main Physics Important Questions with Answers to Evaluate Your Preparation

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Physics is one of the three sections asked in the JEE examination. The aspirants need to give equal importance to all the subjects in order to secure their dream score. So, a well-planned preparation strategy is a must. Moreover, it is essential to know the important questions from each chapter to score good marks.

This article will provide comprehensive knowledge on the most frequently asked topics/questions in the Physics section of the JEE main exam. Let us see what they are:

Top 50 JEE Main previously asked questions

Below-given questions are the most commonly asked questions in JEE Main 2022 Physics throughout the years:

Q 1. While pedalling a bicycle, the friction force exerted on the ground by the wheels is such that it acts as?

A 1. In the forward direction on the rear wheel and the backward direction of the front wheel.

Q 2. The mass of a marble block is 2 kg lying on ice while having a velocity of 6 m/s; it is stopped by friction in 10s. What will be the coefficient of friction considering g = 10 m/s?

A 2. =0.06

Q 3. Consider an inclined plane with inclination∅, which is perfectly smooth. On the other hand, the lower half is rough. When a body at the top, starting from rest, will come to rest again at the bottom, what will be the coefficient of friction for the lower half?

A3. 2 tan ∅

Q4. Two masses of 4 grams and 1 gram move with equal energy. What is the ratio of magnitudes of their momentum?

A4. 1:2

Q5. What will happen if a machine is lubricated with oil?

A5. Friction will decrease when a machine is lubricated with oil. Therefore, there will be an increase in the mechanical efficiency of the machine.

Q6. Consider a force F = 6 t (time-dependent force) acts on a particle having a mass of 1 kg. What will be the work done by the force if the particle starts from the rest during the 1st 1 second?

A6. 4.5 J

Q7. A solid uniform cone’s distance of the centre of mass from its vertex is Z0. In case its base’s radius is R and height is h, then Z0 is equal to?

A7. 3h/4

Q8. Consider two blocks having 10 kg and 4 kg masses connected by a spring of negligible mass while placing them on a frictionless horizontal surface. What will be the velocity of the centre of mass when an impulse gives a velocity of 14 m/s to the heavier block in the same direction as the lighter block?

A8. 10 m/s

Q9. Imagine two particles, X and Y, moving towards one another from rest under the mutual force of attraction. At the instant, when X’s speed is V and Y’s speed is 2 v, what will be the speed of the centre of mass of the system?

A9. v = 0

Q10. When a particle undergoes uniform circular motion, will its angular momentum remain conserved at which part of the circle’s plane?

A10. Centre of the circle

Q11. If a particle is confined to rotate in a circular direction with reducing linear speed. Which of the below-mentioned statements are correct?

A11. Only the direction of L is conserved

Q12. Suppose a uniform cylinder’s moment of inertia having length l and radius R about its perpendicular bisector is I. What will be the ratio of R if the moment of inertia is minimum?

A12. 3/2

Q13. If the distance between the sun and the earth were half its present value, what would be the number of days in a year?

A13. 129 days

Q14. Imagine a satellite moving in a circular orbit around our planet. It has a total energy of E0 (Kinetic Energy + Potential Energy). What is its potential energy?

A14. 2 E0

Q15. Consider a simple pendulum with the time period T1when on the surface of the earth and T2 while taking it to a height R above the surface of the earth. Here, R is the radius of the earth. Determine the value of T2/T1.

A15. T2/T1 = 2

Q16. A gaseous mixture contains 16 grams of helium and 16 grams of oxygen. What will be the CP/CV ratio of the mixture?

A16. 1.62

Q17. 3 moles of oxygen and 5 moles of argon are present in the gas mixture at temperature T. If we consider only rotational and transitional modes, what will be the system’s total internal energy?

A17. 15 RT

Q18. 2 moles of helium are mixed with 3 moles of hydrogen molecules (consider it to be rigid). Now, what will be the mixture’s molar specific heat at constant volume? (R = 8.3 J/mol K)

A18. Cv of mixture = 17.4 J/mol K

Q19. When penetrating 3 cm through a wooden block, how much will it penetrate more before it comes to rest if a body loses half of its velocity?

A19. 1 cm

Q20. A parachutist falls 50 m after bailing out without friction. The parachute decelerates at 2 m/s when it is open. What will be the height he bailed out if he reaches the ground at a speed of 3 m/s?

A20. 293 metre

Q21. If Y is the Young’s Modulus and S is the stress of the material of the wire, then what will be the energy stored in the wire per unit volume?

A21. S2/2Y

Q22. Brass’ elastic limit is 379 MPa. What will be the rod’s minimum diameter if a brass rod is set to support a 400 N load without exceeding its elastic limit?

A22. d = 1.15 mm

Q23. In an isobaric process, what will be the ratio of work done by an ideal monatomic gas to the heat supplied to it?

A23. Cp = 2/5

Q24. The gas’s pressure is proportional to the cube of its absolute temperature in an adiabatic process. What will be the Cp/Cv ratio for the gas?

A24. 3/2

Q25. A diatomic gas having a rigid molecule does 10 Joules of work while expanding at constant pressure. Determine the absorption of heat energy by the gas in this process?

A25. 35 J

Q26. A fixed capacity cylinder of 67.2 litres contains helium gas at STP. What will be the amount of heat required to raise the gas’s temperature by 20℃? Given that R=8.31 J mol-1K-1.

A26. 748 J

Q27. Heat fed to a body that raises its temperature by 1 ℃ is.

A27. Thermal capacity

Q28. “Heat cannot flow from a lower temperature body to a higher temperature body by itself”, is a statement.

A28. The second law of thermodynamics

Q29. A kid is swinging on a swing in a sitting position. What will happen to the time period of the swing after he stood up?

A29. The time period will decrease

Q30. What will happen to the kinetic energy and potential energy in a simple harmonic oscillator at the mean position?

A30. Kinetic energy will be maximum, while the potential energy will be minimum.

Q31. Consider stretching a string between the fixed points separated by 75 cm. It will have resonant frequencies of 315 Hz and 420 Hz, and there are no other resonant frequencies between them. What will be the lowest resonant frequency for the string?

A31. 105 Hz

Q32. Three equal amplitude sound waves have frequencies off-1, f, and f+1. If they superpose to give beats, what will be the number of beats produced per second?

A32. 2

Q33. Imagine an observer moving towards a stationary microwave source at half the speed of light-emitting waves at a frequency of 10 GHz. What will be the frequency of the microwave? Speed of light is given as 3*108 m/s.

A33. 17.3 GHz

Q34. Spherical balls with radius R are falling in a viscous fluid with the viscosity with the velocity v. what will be retarding the viscous force acting on the ball?

A34. Directly proportional to both R and v (radius and velocity)

Q35. Imagine an electric dipole placed at 30° to a non-uniform electric field. What will the dipole experience?

A35. A torque and a translational force

Q36. A uniform wire having length l and radius r contains a resistance of 100 ohms. Later, it was recast into a wire of radius r/2. What will be the resistance of the new wire?

A36. 1600 ohm

Q37. What will its resistance be when a wire is stretched to make it 0.1 % longer?

A37. Increase by 0.2 %

Q38. What will be the capacitance of a spherical conductor with a radius of 1 m?

A38. 12n C V2

Q39. A sheet of aluminium foil with negligible thickness is introduced between the capacitor plates. Now, what will be the capacitance of the capacitor?

A39. It remains unchanged

Q40. Imagine a magnetic needle is kept in a non-uniform magnetic field. What will it experience?

A40. A force and a torque

Q41. What will be the sizes of the nucleus when a nucleus disintegrates into two nuclear parts that have their velocities in the 2:1 ratio?

A41. 1:213

Q42. A photon of frequency contains a momentum associated with it. If c is considered the velocity of light, what will be the momentum?

A42. hf/c

Q43. In a modern optical fibre communication network, the wavelength of the carrier waves is close to.

A43. 1500 mm

Q44. AC cannot be measured by DC ammeter because

A44. The average current value for the complete cycle is zero

Q45. EM waves are transverse in nature, is proved by

A45. Polarisation

Q46. The physical sizes of the transmitter and receiver antenna in a communication system are

A46. Inversely proportional to the carrier frequency

Q47. What will be the speed of light in the medium?

A47. Minimum on the axis of the beam

Q48. What will happen during the propagation of the EM waves in a medium?

A48. The electric energy density will be equal to the magnetic energy density

Q49. What will happen when the beam enters the medium?

A49. It will converge

Q50. What image will be formed by an objective of a compound microscope?

A50. Real and enlarged images will be formed

Also See: JEE Main Most Important Topics

Conclusion

JEE Main 2022 is a competitive exam, and many students take this exam to get admitted into India’s top universities. To obtain great scores, they should concentrate on all three sections of JEE Main 2022 Syllabus, including Physics, Chemistry and Mathematics. This article has discussed the top 50 most important questions which can be asked in the main exam.

Also See: JEE Main Physics Notes

FAQs about JEE Main Physics Important Questions

1. How many hours should I spend studying for the Physics section in JEE Main?

The studying time depends on the student. Some may be fast learners; some might take more time. So the students should take their own time to study the concepts. However, if we consider an average student, he might have to study for at least 1 to 2 hours a day.

2. List the seven hardest topics in JEE Physics.

The following are the seven hardest topics according to the past JEE aspirants: