# HBSE Class 11 Physics Important Question Answer PDF 2023

Class 11 Physics BSEH Solution for all Chapters Important Question Answer for Haryana board. CCL Chapter Provide Class 1th to 12th all Subjects Solution With Notes, Question Answer, Summary and Important Questions.

Also Read – HBSE Class 11 Imporant Questions in Videos 2023

HBSE Class 11 Physics Important Question Answer / grade 11 physics Important questions of all chapters Solution.

## Class 11 Physics 1 Marks (fill in the Blanks and 1 Word) Important Questions

Q1. Work done by a person in lifting a bucket out of a well by means of a rope tied to the bucket is positive or negative ?

Q2. The bob A of a pendulum released from 30° to the vertical hits another bob B of the same mass at rest on a table as shown in Fig. How high does the bob A rise after the collision? Neglect the size of the bobs and assume the collision to be elastic. Q3. What is the mathematical form of Kepler’s third law?

Q4. Write the value of orbital velocity of Satellite revolving near the surface of Earth.

Q5. The Young’s modulus of steel is greater than that of rubber. Give reason.

Q6. When two sound sources are sounded together, then 2 beats are produced in .20 Second. Find the frequency of the beats.

Q7. How much will be the Kinetic Energy of a gas at the absolute zero ?

Q8. What is the relation of internal energy of an ideal gas with gas temperature?

Q9. Is coefficient of performance of a refrigerator constant ?

Q10. If on applying force F, body move with velocity v, then power will be ___________.

Q11. When the momentum of body is increased by three times, its K.E becomes ___________.

Q12. A planet is revolving round the sun as shown in figure: At which point the velocity of the planet is maximum ?

Q13. Write the value of Escape velocity of body from Earth’s surface.

Q14. By virtue of which property does the free surface of a liquid try to keep its area minimum ?

Q15. Write down the formula for the speed of transverse waves in a stretched string.

Q16. A gas is carried through the path AB, BC and CA according to the adjoining figure. What is the net work done in the whole cycle? Q17. Which law of thermodynamics first introduced the concept of Internal Energy?

Q18. What is SI unit of Gas Constant ?

Q19. ___________ is 1/273.16 th part of  thermodynamic temperature of the triple point of water.

Q20. The angle of projection for which a projectile cover the maximum horizontal range is _________.

Q21. The rate of doing work by a machine is called ___________ of the machine.

Q22. The value of ___________ is determined to be 6.67×10-11 Newton-metre2/kg2.

Q23. By using ball bearings, sliding friction can be converted into _________ friction. Most Important

Q24. The number of degrees of freedom of a molecule of a diatomic gas is __________.

Q25. The number of degrees of freedom of a molecule of a monoatomic gas is _________.

Q26. 4.18 Joule of work is equivalent to calories of heat.

Q27. The angle inside the liquid between the tangent to the solid surface and the tangent to the liquid surface at the point of contact is called ________ for that pair of solid and liquid.

Q28. The equation of a simple harmonic motion is y = 10sin100πt. Give value of amplitude of oscillation.

Q29. The equation of a simple harmonic motion is y = 5 sin 200t. Give value of amplitude of oscillation.

Q30. Write relation between coefficient of linear expansion (∝) and coefficient of surface expansion (β) of a solid material.

Q31. Write relation between coefficient of linear expansion (α) and coefficient of volume expansion (r) of a solid material.

Q32. What is relation between coefficient of static friction and the angle of friction? Most Important

Q33. What is time-period of Geo-stationary satellite ? Most Important

Q34. Write down the formula for work done in rotatory motion. Most Important

Q35. How many erg are there in 1 Joule?

Q36. ________ is defined as the mass of a Platinum-Iridium cylinder kept in Paris.

Q37. The angles of projection for which a projectile covers the same horizontal range, are 30° and _________.

Q38. What is unit of work in C.G.S. system?

Q39. The _______ of a body is defined as its capacity of doing work.

Q40. In the universe each particle of matter attracts every other particle. This universal attractive force is called __________.

Q41. The angle inside the liquid between the tangent to the solid surface and the tangent to the liquid surface at the point of contact is called _______ for that pair of solid and liquid.

Q42. ________ Joule of work is equivalent to 1 calorie of heat.

Q43. When a body being acted by an external periodic force, vibrates with the frequency of the force, then the vibrations of the body are called _________ vibrations. Most Important

Q44. If a vector A is multiplied by a scalar m, what will be the resultant vector?

Q45. If a vector C is multiplied by a scalar n, what will be the resultant vector.

Q46. When 100 Joule of heat is given to a gaseous system, then internal energy increases by 30 Joule. Find the work done by the system.

Q47. When 200 Joule of heat is given to a gaseous system, then internal energy of increases by 60 Joule. Find the work done by the system.

## Class 11 Physics 2 Marks Important Questions

Q1. State Newton’s Second Law of Motion. Define S.I. unit of force:

Q2. Explain work-energy theorem.

Q3. The average distance of the sun from a planet is four times in comparison to average distance of Sun from Earth. Find the time period of revolution of the planet.

Q4. A force of 160 N is applied on a nail, whose tip has a cross-sectional area of .004 cm². Calculate the pressure on the tip.

Q5. What is the First Law of thermodynamics ? Explain adiabatic process on the basis of first law of thermodynamics.

Q6. Write the formula of acceleration of a particle executing simple harmonic motion and draw its acceleration-time curve.

Q7. Write down the postulates of kinetic theory of gases. Most Important

Q8. Check weather 1/2 mv² = mgh equation is dimensionally correct or not :

Here m = mass of material, v = velocity, g = gravitational acceleration, h = height

Q9. Obtain equation of motion S = ut + 1/2 at² for constant acceleration using method of calculus.  S = displacement, u = initial velocity, t = time.

Q10. What do you mean by Friction ? Write laws of friction.

Q11. What is potential energy? Find the expression for potential energy of a spring.

Q12. Define Escape speed. Find expression/formula  for the Escape speed of earth.

Q13. What is Viscosity ? What is the difference between Viscosity and friction ?

Q14. An electric heater supplies heat to a system at a rate of 100 W. If system performs work at a rate of 75 joules per second. At what rate is the internal energy increasing?

Q15. What do you mean by specific heat capacity. Find the ratio of two specific heats Cp and Cv for diatomic gases.

Cp = specific heat capacity at constant pressure, Cv = specific heat capacity at constant volume.

Q16. Define Standing waves and Beats.

Q17. Check the equation v = u + at by the method of  dimensions. Where v = Final velocity, u = Initial velocity, a = Acceleration, t = Time. Most Important

Q18. An object is moving in a given direction with a definite velocity. Draw time-velocity and time-displacement graphs for the object.

Q19. An object is moving with a constant acceleration. Draw time-velocity and time displacement graphs for the object.

Q20. A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of 12 ms-1. If the mass of the ball is .15 kg, determine the impulse imparted to the ball. (Assume linear motion of the ball.)

Q21. Define Gravitational Potential Energy.

Q22. Obtain the expression for acceleration due to gravity at depth d below the Earth’s surface, in terms of acceleration due to gravity at Earth’s surface and the radius of Earth.

Q23. Find out the amplitude and the frequency from the equation of SHM y = 5 sin 100πt. The displacement has been expressed in meters and the time in seconds.

Q24. Write two difference between Isothermal and Adiabatic process. Most Important

Q25. Write Newton’s Law of Cooling. Most Important

Q26. What do you understand by Capillarity ? Write down the formula for the rise of water in a capillary tube.

Q27. If a physical quantity is P = a2b2/cand the percentage errors in the measurements of a, b and c are 1%, 2% and 3% respectively, find the maximum percentage error in the measurement of physical quantity P.

Q28. A cricketer moves his hands backwards while holding a catch. Why?

Q29. What do you mean by impulse ? Is impulse a scalar or a vector quantity.

Q30. Give answers to the following questions –
(i) If the net force acting on a body be zero then will the body remain necessarily in ‘rest position.
(ii) Write second law of motion in vector form.

Q31. What is a Geo-stationary Satellite. Write its one use.

Q32. Discuss the variation of acceleration due to gravity ‘g’ on going above the surface of earth.

Q33. What is Second’s Pendulum ? Determine its length.

Q34. Give two examples of isothermal process.

Q35. What do you understand by capillarity ? Write down the formula for the rise of liquid in a capillary tube.

Q36. Define “coefficient of thermal conductivity” and write its unit.

Q37. Draw velocity-time graph of a particle executing simple harmonic motion.

Q38. Draw acceleration-time graph of a particle executing simple harmonic motion.

Q39. Write Stoke’s Law.”

Q40. The applied force F = 3i + 4j – 5k on a particle produces displacement S = 5i + 4j + 3k. calculate work done by the force. Most Important

Q41. If a physical quantity is X = a³b³/c and the percentage errors in the measurement of a, b and c are 1%, 2% and 3% respectively. Find the maximum percentage error in the measurement of physical quantity X.

Q42. Write Pascal’s Law.

## Class 11 Physics 3 Marks Important Questions

Q1. Establish relation between coefficient of friction and angle of friction.

Q2. The centripetal force F acting on a particle moving in circular orbit depends on its mass m, radius of the circle r and the speed of particle v. Obtain the formula for the centripetal force, using dimension method.

Q3. Explain, Second Law of Thermodynamics.

Q4. Explain, Second Law of thermodynamics with the help of suitable diagram.

Q5. What is meant by ‘centre of mass’ of a system ? Obtain expression for the centre of mass of a system consisting of two particles. Most Important

Q6. Obtain expression for the centre of mass of a system consisting of two a particles. Most Important

Q7. A simple pendulum, having a bob attached to a string, that oscillates under the action of the force of gravity. Suppose that the period of oscillation of the simple pendulum depends on its length (l), mass of the bob (m) and acceleration due to gravity (g). Derive the expression for its fume period. Using method of dimensions.

Q8. Analytically derive the formula for the work done by one mole of an ideal gas during isothermal expansion from volume V1 to volume V2.

Q9. Find the torque of a force 7i + 3j + 5k about the origin. The force acts on a particle whose position vector is i – j + k.

Q10. State and prove theorem of perpendicular axis. Using this theorem find the moment of inertia of a disc about one of its diameters.

Q11. In an experiment of simple pendulum, a student made several observations for the period of oscillations. His reading turned out to be : 2.63 sec, 2.56 sec, 2.42 sec, 2.71 sec and 2.80 sec. With the help of above observations calculate absolute errors and relative error.

Q12. What do you understand by Centripetal Force ? A particle of mass m is moving in a circular orbit of radius r with uniform speed v. Write the formula and direction of Centripetal Force acting on the particle.

Q13. Show that mechanical energy of a freely falling body justifies the Law of Conservation of Mechanical Energy.

Q14. Locate the centre of mass of a system of three particles of masses 1 gram, 2gram and 3 gram placed at the corners of an equilateral triangle of 1 meter side. Q15. Establish Mayer’s formula Cp – Cv = R from the First Law of Thermodynamics.

Q16. State the Law of Equipartition of Energy. Prove that for an ideal gas r =1+ 2/f, where f is the number of degree of freedom of gas molecules.

Q17. State the Law of Conservation of Angular Momentum. Explain it by giving any one example. Most Important

Q18. A particle is revolving in circular orbit in a horizontal plane. The centripetal force (F) acting on it depends upon the mass (m), radius (r) of the circle and speed (v) of the particle. Obtain the formula for the centripetal force on it by the method of dimensional analysis.

Q19. Write the Laws of Limiting friction. Most Important

Q20. What do you mean by conservative and non- conservative forces? Give one example of each.

Q21. What is adiabatic change? Write the relation between pressure and volume of an ideal gas for an adiabatic change. What is the meaning of r.

Q22. Write down the postulates of the Kinetic theory of gases. Most Important

Q23. From a uniform disc of radius R, a circular disc of radius R/2 is cut out. The centre of the circular cut is at R/2 from the centre of the 2 original disc. Locate the centre of mass of the resulting flat body.

Q24. Obtain the formula for the escape velocity of a body from the Earth. Most Important

Q25. Write difference between isothermal and adiabatic process. Most Important

Q26. If two vectors A and B represent two adjacent sides of parallelogram, then prove that, magnitude of resultant R = √A2+ B2+ 2AB cosθ.

Q27. Name and define the various absolute and gravitational units of force. How are these units related to each other?

Q28. A projectile is thrown at an angle θ from the horizontal with velocity u under the gravitational field of Earth. Find expression for time of flight.

Q29. Establish the relation between torque and moment of Inertia in rotational motion and define from it moment of Inertia.

## Class 11 Physics 5 Marks Important Questions

Q1. State and prove Bernoulli’s theorem. Most Most Imporant

Q2. Obtain an expression for the time-period of a simple pendulum. Most Imporant

Q3. Prove that the number of beats heard per second is equal to the difference in frequencies of two sound sources. Most Important

Q4. Explain the meaning of the coefficient of linear expansion (α), coefficient of superficial expansion (β) and coefficient of volume expansion (γ) of a solid material. Establish relation among α and γ.

Q5. Establish relation between coefficient of linear expansion (α), coefficient of superficial expansion(β), and coefficient of volume expansion (γ).

Q6. A projectile is thrown at an angle θ from the horizontal with velocity u under the gravitational field of earth. Find its maximum height attained and the horizontal range. Most Imporant

Q7. A projectile is thrown at an angle from the horizontal with velocity u under the gravitational field of Earth. Find expression for Time of flight and Horizontal Range.

Q8. What do you mean by projectile ? Prove that path of a projectile is parabolic. Find the expression for maximum Height of projectile Time taken to reach this height and the horizontal rang.

Q9. What do you understand by the term projectile motion. If a projectile is projected at an angle θ from the horizontal with velocity u in the gravitational field, prove that the path of the projectile will be a parabola.

Q10. What is meant by stationary wave ? Prove that in an open organ pipe, both odd and even harmonics are produced. Most Important

Q 11. State and prove Newton’s Law of Cooling. Most Important

Q12. How many modes of heat transfer? Explain in details.

Q13. Derive expression of kinetic and potential energy of a single harmonic oscillator. Hence show that total mechanical energy, E = K + U easy constant in S.H.M.

Q14. Discuss the formation of harmonics in stretched string. Show that in case of a stretched string the first four harmonics are in the ratio 1 : 2 : 3 : 4.

Q15. Define uniformly accelerated motion. A particle is moving with uniform acceleration a in a straight path. Its initial velocity is u, displacement S and final velocity v. Using calculus method show that:

v² = u² + 2aS

Q16. What do you mean by Viscosity ? Obtain an expression for terminal velocity of a ball falling in a viscous liquid.

Q17. What are scalar and vector quantities? Give examples. Find the magnitude and direction of the resultant of two vectors A and B in terms of their magnitudes and angle θ between them. Also define parallelogram law of vector addition.

Q18. Find expression for kinetic energy, potential energy and total energy of oscillation of a body executing simple harmonic motion.

Q19. Define surface tension of a liquid. Find an expression for the access pressure inside a soap bubble.

Q20. Derive expression for the formula of rise of water in a capillary tube.

Q21. A cylindrical piece of cork of base area A and height h floats in a liquid of density p1. The cork in depressed slightly and then released. Show that the cork oscillates up and down simple harmonically with a period

T = 2π√hp/p1g

Where p is the density of cork (ignore damping due to viscosity of the liquid).

Q22. If two vectors A and B represent two adjacent sides of parallelogram, then prove that, magnitude of resultant

R = √A² + B² + 2AB cos θ

Where A and B respectively, magnitude of A and B and θ is the angle between them.

Q23. If two vectors A and B represent two adjacent of parallelogram, then prove that, sides of magnitude of resultant

R = √A2+ B2 + 2AB cosθ and

Direction of resultant with A is

α = tan-1 [ Bsinθ/ A+ B cosθ ]

Where A and B respectively, magnitude of A and B and θ is the angle between them.

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