# Very Important Long Questions Collection – All Unit | Physics Class 11

## HSEB Exam | Questions Collection Very Important Long Questions Collection For: Science | Physics Class 11 From: All Unit

We have listed some very Important Questions. The repeating frequency of this questions are Comparatively High. This questions are asked on lots of previous papers.

Disclaimer: This questions are neither guessed nor we guarantee the possibility in the coming exam. This questions are often repeated in the previous exams.

Unit 1: Mechanics

1. State the parallelogram law of vector addition. Derive the expression for the magnitude and direction of the resultant of two vectors inclined at an angle θ from each other. [2069]
2. State triangle law of vector addition. Obtain an expression for the resultant of two vectors P and Q inclined an angle θ. [2066]
3. Derive expression for maximum height, range of projectile fired at angle θ with horizontal. [2067]
4. State the principle of conservation of linear momentum. How does the Newton’s third law of motion lead to the principle of conservation of linear momentum? [2069]
5. State Newton’s laws of motion. Show that Newton’s first law of motion defines force and second law of motion defines the unit of force. [2064]
6. What is the angle of repose? Show that when a body just begins to slide down on an inclined plane, the coefficient of friction is equal to the tangent of inclination of the plane. [2063]
7. What do you understand by friction? Explain its cause. Show that the coefficient of static friction is equal to the angle of repose. [2062]
8. What is the principle of conservation of energy? Show that total mechanical energy of conserved when it moves under the action of gravitational field. [2069]
9. Define work. Derive an expression to calculate work done by a variable force. [2067]
10. What are elastic and inelastic collision? Give an example of each. Write the energy and momentum equations for an inelastic collision. [2059]
11. Define centripetal force. Calculate the force acting on a body moving with uniform speed along circular path. [2069]
12. What is conical pendulum? Show that the period of oscillation of this pendulum is given by: T = 2π (lcosθ/g)1/2 [2066]
13. What is escape velocity? Derive expression for it. [2069]
14. What is acceleration due to gravity? Explain how it varies with the altitude. [2058]
15. What is satellite? Calculate the orbital velocity of of an artificial satellite. [2056]
16. State principle of moments. Explain how you verify the principle of moment in your laboratory. [2059]
17. Define moment of inertia and angular momentum. Establish a relation between them. [2068]
18. What is meant by a couple? Derive an expression for the work done by a couple. [2066]
19. Define moment of inertia. How is it related with rotation kinetic energy of a body? [2057]
20. What do you mean by elastic limit? Derive an expression for the energy stored in stretched wire. [2069]
21. Define stress and strain. Derive an expression for energy stored in a stretched wire. [2068]
22. State Hook’s Law and describes different types of modulus of elasticity. [2066]
23. Define elastic limit and Young’s modulus of elasticity. Explain how you would determine Young’s modulus for a material in the form of a wire. [2060]
24. What is Poisson’s ratio? Derive an expression for the energy stored in a stretched wire? [2057]
25. Define Simple harmonic motion and obtain an expression of time period of a simple pendulum. [2069]
26. What is simple pendulum? Show that motion of the bob of the simple pendulum is simple harmonic. Obtain an expression for its frequency. [2069]
27. Explain, with necessary theory, the capillary tube method for the measurement of surface tension of a liquid. [2068]
28. What is capillarity? Deduce an expression for the rise of a liquid in capillary tube. [2067]
29. Derive Newton’s formula for viscous force. Define coefficient of viscosity. Calculate its dimensions. [2068]
30. Derive an expression for terminal velocity of a small spherical ball of radius “a” dropped gently in a viscous liquid of density p and coefficient of viscosity Ƞ. [2066]
31. Derive Bernoulli’s equation form the work energy theorem. Explain why the equation valid only for steady, non-viscous and incompressible fluid. [2059]

Unit 2: Heat and Thermodynamics

1. Define linear and cubical expansivities of solids. Derive an expression for the variation in density of a solid when its temperature is raised from θ°1C to θ°2C. [2069]
2. Define coefficient of linear expansion. Obtain the relation between α and ϒ. [2066]
3. Define linear, superficial, and cubical expansivities. Show that β = 2α where α and β are linear and superficial expansivities. [2060]
4. Obtain an expression for the change in density of a gas due to the thermal expansion. [2051]
5. State and explain Newton’s law of cooling and derive the expression for the specific heat of the liquid. [2069]
6. Define latent head of fusion of ice. Describe the method for the measurement of it in the laboratory. [2068]
7. State Charle’s law of gases. Derive the ideal gas equation PV = nRT. Where symbol have usual meaning. [2069]
8. Use the kinetic theory of gases to derive an expression for the pressure exerted by a gas on the walls of its container. [2069]
9. State Boyle’s law and Charle’s law and hence obtain the relationship for the combined gas law. [2062]
10. Define thermal conductivity. Describe Searle’s method of determination of thermal conductivity of good conductor. [2069]
11. What is a black body? Derive Stefan’s law of black body radiation. [2058]
12. What do you mean by isothermal process? Obtain an expression for the work done by an ideal gas in the isothermal process. [2069]
13. Define tow specific heat capacity of the gas. Show that for an ideal gas Cp – Cv = R. [2069]
14. Define adiabatic process in thermodynamics. Show that: PVy = constant. Where symbols have their usual meanings. [2066]
15. State and explain the first law of thermodynamics and use it to derive the relation, PVy = constant where the symbols have their usual meanings. [2064]
16. Describe the working of petrol engine with the help of P-V diagram. [2069]
17. Describe the working of carnot’s engine with the help of its p-v diagram. [2069]
18. What is heat engine? Calculate the thermal efficiency of a heat engine. [2068]
19. State and explain the second law of thermodynamics. [2063]

Unit 3: Geometric Optics

1. Point out the difference between real image and virtual image. Obtain a realtion connecting the objects distance, image distance and focal length of concave mirror. [2069]
2. What do you mean by principle forms of a convex mirror? Prove mirror formula for a convex mirror and also show that m = v/u for the same mirror. [2064]
3. What is lateral shift? Derive an expression for it due to a parallel edged glass slab. [2067]
4. What is the deviation of light? Show that deviation produced by a small angled prism is independent of the angle of incidence. [2069]
5. Derive an expression for lens maker’s formula. [2069]
6. Define radius of curvature of a lens. Derive Lens maker’s formula. [2068]
7. Define principle focus. Derive the lens formula for the concave lens and show that m = v/u for the same lens. [2065]
8. What is chromatic aberration? Show that the chromatic aberration is the product of dispersive power and mean focal length of a lens. [2069]
9. With the help of a labeled diagram. Explain the principle and working of a compound microscope. Derive an expression for the magnifying power. [2069]
10. What is long sightedness? Discuss the possible causes of long sightedness. Explain, how this deflect can be remedied. [2069]

Unit 4: Electrostatics

1. State Gauss Theorem. Use this theorem to find the electric field intensity due to a plane charged conductor. [2069]
2. Define electric potential. Derive an expression for the potential due to a point charge at any point in space. [2069]
3. How can a number of capacitor be connected to increase and decrease the effective capacitor? Find the respective expression for the effective capacitance in each case. [2069]
4. Find the equivalent capacitance of two capacitors when they are connected. (i) in series and (ii) in parallel. [2069]
5. What is capacitor? Find the energy stored in a charged capacitor. [2067]
Posted By : | Comment RSS | Category : Class XI, HSEB Notes

1. saurav
Posted June 18, 2015 at 3:43 pm

Only this question i have prepared and i can able to answer all derivation question asked in exam . Really helpful wants numerical .. and pls do same for chemistry

• Amy Cresta
Posted March 31, 2016 at 8:08 am

hey! saurav
for pre-board if we read these question which is given above..

is that be sufficient ..
and if I read those only but in exam beside this other question would come then???????

• MeroSpark
Posted March 31, 2016 at 12:09 pm

Hello ! Amy, These questions are very important for an exam which repetition frequency is comparatively more. There are lots of other questions which are possible for the exam. In the exam, about two or one questions are given out of syllabus or simply we can say the new questions. So prepare well, If you only want to pass the exam then this much is sufficient, or if you want to score more then prepare all. All the best for your exam.

2. Ashish poudel
Posted October 31, 2015 at 10:36 am

please prepare totally notes for science 11 …. and i loved ur publised thing keep it up

Posted May 3, 2016 at 10:01 am

Can you make list of most repeted and important questions for chemistry it would be very help full .plz plz

4. Rishu
Posted November 9, 2016 at 8:54 am

I request u tooo alsoo include the numericals which are repeated frequently n important for the hseb exams

5. Narayan
Posted January 4, 2017 at 10:24 pm

Thanks very much to the person who started this page . I noted the above questions in copy and practised them all and I am happy after my exam because I did all derivations . But numericals was hard ,please help to do all numericals . Thanks again!!!

6. santosh thapaliya
Posted February 8, 2017 at 7:01 am

hey. it was nice of u…
now can i get all the solution of these questions ..