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www.gicsirpur.webnode.com www.sewaa.webnode.com lnter Public Exams - Section wise lmportant Questions Physics-l(E'M) Page | 1SUBJECT: PHYSICS- I (E.M )(18 Days) Prepored by: Sri. K. KRISHNA, CJL Ph$i6, Cell:8e852oe62e,e44114762e

Doy Dote Section wise - Question(s) to be prepored / Prqcticed Attempt

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Section -A {Two [ 2 ] Marks Questions ]1. What is the discovery of C.V Raman ?2. What are the fundamental forces in nature?3. What is the contr4ibution of S.Chandra Sekhar to physics?4. Distinguish between accuracy and precision5.What are the different types of errors that can occur in a measurement?6. What are significant figures and what do they represent when reporting the result of a

measurement?7. Define Fundamental and derived quantity ?8. Distinguish between fundamental units and derived units.9. Why do we have different units for the same physical quantity?10. What is dimensional analysis?11 . How is average velocity different from instantaneous velocity?12. Give an example where the velocity of an object is zero but its acceleration is not zero.13. Give an example of one-dimensional motion where a particle moving along the positive

X - Direction comes to rest periodically and moves forward.

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14. Rain is falling vertically with a speed of 35 m/s. A woman rides a bicycle With a speed of12 mls in east to west direction. What is the direction in which she should hold her umbrella?

15. A Cricket ball is thrown at a speed of 28 m/s in a direction 300 above the horizontal. Calculatethe maximum height.16. The vertical component of a vector is equal to its horizontal component. What is the angle

made by the vector with x-axis?17. Two forces of magnitudes 3 units and 5 units act at 600 with each other. What is the magnitude

of their resultant ?A,A18. A = i + j. What is the angle between the vector and X-axis19. When two right angled vectors of magnitude 7 units and 24 units combine, what is the

magnitude of thelr resultant ? A A20. lf p =2i+ 4j+ 14k and Q=4i +4j + 10k. Findthe magnitude of p+Q21. Can a vector of magnitude zero have non-zero components?22.What is the acceleration of projectile at the top of its trajectory ?23. Define unit vector, null vector and position vector.za. ffl.? +B l= t 3-E prove that the anqle between a and b is 900

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25. Define momentum and lmpulse?26. What is inertia ? What gives the measure of inertia ?27. When a bullet is fired from a gun, the gun gives a kick in the backward direction. Exptain.28.Why does a heavy rifle not recoil as strongly as a light rifle using the same cartridges?29.|f a bomb at rest explodes into two pieces, the pieces must travel in opposite direction. Explain30. Why does the car with a flattened tyre stop sooner than the one with inflated tyres?31. A horse has to pull harder during the start of the motion than later. Explain.32. Calculate the time needed for a net force of 5N to change the velocity of a 1Okg mass by 2mls33. Define dot product?34. Define: Work, Power and Energy. State their Sl units.35. Explain the law of conservation of energy?36. Define coefficient of restitution? What are the values of e ?37. State the relation between the kinetic energy and momentum of a body38. State the sign of work done by a force in the following :a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

b) Work done qravitationalforce in the above case.

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www.gicsirpur.webnode.com www.sewaa.webnode.com lnter Public Exams - Section wise lmportant Questions Physics-l(E.M) Page | 2Bg. A body freety falling from a certain height 'h', after striking a smooth floor rebounds and h

rises to a height h/2. What is the coefficient of restitution between the floor and the body?40. What is the total displacement of a freely falling body, after successive rebounds from the

same place of ground, before it comes to stop? Assume that'e' is the coefficient of restitutionbetween the bodv and the ground.

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41 . Define centre of mass and centre of gravity? A ,. A A A42.Findthescalarandvectorproductsof twovectors A=3i-4j+5k andB=-21+j-3k43.Defi ne Torque and Angularrnogentum?44. Find the torque of a force 17i - ej + 5k) about the origin. The force acts on a particle whoseposition vector is ( i -j + k)45. ls it necessary that a mass should be present at the centre of mass of any system?46. Why are spokes provided in a bicycle wheel?47 . By spinning eggs on a table top, how will you distinguish a hardboiled egg from a raw egg?48. Why should a helicopter necessarily have two propellers?49. Why is it easier to balance a bicycle in motion ?50. Give any two characteristics of Centre of Mass?51. What is the length of a simple pendulum, which ticks seconds?52. A girl is swimming seated in a swing. What is the effect on the frequency of oscillation if she

stands?53. Will a pendulum ctock gain or lose time when taken to the top of a mountain?54. A pendulum clock gives correct time at the equator. Will it gain or lose time if it is taken to the

Poles? lf so, why?55. Can a simple pendulum be used in an artificial satellite?56. Define simple harmonic motion. Give an example.57. The displacement in S.H.M is given by y=" sin(2Ot + 4). What is the displacement when it is

increased by 2TElw58. State the unit and dimension of the universal gravitational constant (G)59. State the vector form of Newton's law of gravitation60. Keeping the length of a simple pendulum constant, will the time period be the same on allolanets? Suooort vour answer with reason.

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61.What are the factors that make 'g' the least at the equator and maximum at the poles?62. 'Hydrogen is in abundance around the sun but not around earth'. Explain.63.What is the time period of revolution of a geostationary satellite ? Does it rotate from West toEast or from East to West ?64. What are polar satellites?65. State Hooke's law of elasticity.66. State the units and dimensions of stress.67. State the units and dimensions of modulus of elasticity.68. State the examples of nearly perfect elastic and plastic bodies.69. Define prisson's ratio ?70. lf an iron is stretched by 1oh, what is the strain on the wire?71.Define Viscosity. What are its units and dimensions?72.Why are drops and bubbles spherical?73. Give the expression for the excess pressure in a liquid drop74. Give the expression for the soap bubble in air.75. Mention any two examples that Obey Bernoulli's theorem and justify them.76. What is the principle behind the carburetor of an automobile?77. What is the pressure on a swimmer 10m below the surface leaked?78. What is magnus effect?79. Define Surface Tension? Mention its units?80. Can a substance contract on heatinq? Give an example

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81. Why gaps are left between rails on a railway track ?82. What are the units and dimensions of specific gas constant ?83. Why do liquids have no linear and areal expansions?84. What is anomalous behavior of water ?85. Give an example for Regelation?86. Define Triple point of water ?87. Why utensils are coated black? Why the bottom of the utensils is made of copper?88. Ventilators are provided in rooms just below the roof. Why?89. State the units and dimensions of coefficient of convection.90. What is greenhouse effect? Explain global warming.91. State Newton's law of cooling?92. State the conditions under which Newton's law of cooling is applicable.

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93. Define94. Obtain the relation between Celsius and Fahrenheit scales of temperature.95. What is the relation between "Cr , o(e o^.l oCv96.What is the temperature for which the readings on Kelvin and Fahrenheit scale are same?97. What is the temperature for which the readings on Celsius and Fahrenheit scale are same?98. lf normal temperature of a human body 98.40F. Change it into Celsius?99. Define Thermal equilibrium. How does it lead to Zeroth Law of Thermodynamics?100. Define First law of Thermo Dynamics101. Define specific heat capacity of the substance. On which factors does it depend?102. Whv a heat enqine with 100% efficiency can never be realised in practise?

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103. ln summer, when the valve of a bicycle tube is opened, the escaping air appears cold. Why?104. Can a room be cooled by leaving the door of an electric refrigerator open?105. Define Second law of Thermo Dynamics106. A thermos flask containing a iquid is shaken vigorously. What happens to its temperature?107. How much will be the internal energy change in i) isotherma process ii) adiabatic process108. lndicate the graph showing the variation of specific heat of water with temperature. Whatdoes it signify ?109. Find the specific heat of a gas in lsothermal change, Adiabatic change110. Why the worm liquids flow faster than cool liquids?111. When does a realgas behave like an idealgas?112 State Boyle's law and Charles Law.113. Pressure of an ideal gas in container is independent of shape pf the container - explain.114. What is expression between pressure and kinetic energy of gas molecules?115. The absolute temperature of a gas is increased 3 times. What will be the increase in rmsvelocitv of the qas molecule?

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Section-B { Four [4] MarksQuestions]Units and Measurements1. The velocity of a body is given by V=At2 + Bt + C. lf V and t are expressed in Sl what are the

Units of A,B,CMotion in Straight line2. A bird holds a fruit is its beak and files parallel to the ground. lt lets go of the fruit at some

height . Describe the trajectory of the fruit as it falls to the ground as seen by(i)the bird (ii) a person's on the ground.

3. A stone is dropped from a height 300 m and at the same time another stone is projectedvertically upwards with a velocity of 100 m/s, find when and where the two stones meet.

4. A ball is dropped from the roof of a tall building and simultaneously another ball is thrownhorizontally with same velocity from the same roof. Which ball is lands first ? Explain.5. Show that the maximum height reached by a projectile launched at an angle of 450 is onequarter of its ranqe.

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Motion in a plane6. State paralletogram law of Vectors. Derive an expression for the magnitude and direction of

the resultant Vector.7. Show that the trajectory of an object thrown at certain angle with the horizontal is a parabola.4.+-+-+A. f tZ+-U t = tZ--5'l Prove thatthe angle between a and b is 900

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9. A force Z? * i ^t N acts on a body which is initially at rest. At the end of 20 sec. The velocityof the body is 4i + tj - K m/s. What is the mass of the body?10. A projectile is fired at an angle of 600 to the horizontal with an initial velocity of 800 m/si) Find the time of flight of the projectile before it hits the ground.ii) Find the distance it travels before it hits the ground (R)iii) Find the time of flight for the projectile to reach its maximum height.Laws of Motion :11. Why are shock absorbers used in motor cycles and cars ?12. Explain advantages and disadvantages of friction.13. Mention the methods used in decrease friction.14. State the laws of rolling friction15. Why is pulling the lawn roller preferred in pushing it?Work. Enerqy and Power16. Show that in the case of one dimensional elastic collision, the relative velocity of approach

of two colliding bodies before collision is equal to the relative velocity of separation aftercollision.

17. Derive an expression for the height attained by a freely falling body after 'n' number ofrebounds from the floor.

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18. A machine gun fires 360 bullets per minute and each bullet travels with a velocity of 600m/s.lf the mass of every bullet is 5 gr, Find the power of the machine gun ?

19. Define dot product ? Give its properties.Svstems of particles & Rotational motion20. Distinguish between centre of mass and Centre of gravity.21. Exptain about the centre of mass of earth - moon system and its rotation around the sun22. Define Vector product. Explain any two properties of Vector product.23. Define angular Velocity. Derive V = r to24. State and prove perpendicular axes theorem

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Oscillations:25. Obtain an equation for the frequency of oscillation of spring of force constant k to which amass m is attached.26. Derive the expressions for displacement, Velocity and acceleration of a particle executes

S.H.M.Gravitation:27. State Kepler's laws of planetary motion.28. Derive the relation between g and G.29. What is orbit Velocity? Obtain an expression for it.30. What is escape velocity ? Obtain an expression for it.31. What is qeostationary satellite ? State its uses.

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Mechanical properties of Solids :32. Define Hook's Law of elasticity, proportionality, permanent set and breaking stress.33. Define strain energy and derive the equation for the same.34. Describe the behavior of a wire under gradually increasing load.BS. While constructing buildings and bridges a pillar with distributed ends is preferred to a

oillars with rounded ends. Whv?3/8


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www.gicsirpur.webnode.com www.sewaa.webnode com lnter Public Exams - Section wise lmportant Questions Physics-l(E'M) Page | 5Mechanical properties of Fluids :36. Explain hydraulic lift and hydraulic breaks.37. What is Venturi - meter ? Explain how it is used.38. What is Reynolds number ? What is its significance ?39. Explain dynamic lift with examples ?

14Thermal properties of matter :40. Explain Celsius and Fahrenheit scales of temperatures. Obtain the relation between these

scales of temperature.41. Pendulum Clocks generally go fast in winter and slow in summer. Why?42. ln what way is the anomalous behavior of water advantageous to aquatic animals?43. Explain conduction, convection and radiation with examples?44. Explain thermal conductivity and coefficient of thermal conqqctivity?

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15 Thermodynamics:45. Obtain an expression for the work done by an ideal gas during isothermal change.46. Compare isothermaland an adiabatic process.Kinetic Theory:47. Explain the leinetic interpretation of Temperature.48. Four molecules of a gas have speeds 1,2,3, & 4 Km/s. Find the rms speed of the gas

Molecule.

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Section-C { Eight[8] Marks Questionsf .i) State Newton's second law of motion. Hence derive the equation of motion F=ma from it.

ii) A body is moving along a circular path such that its speed always remain constant. Shouldthere be a force acting on the body ?

2. Develop the notions of work and kinetic energy and show that it leads to work - energytheorem.

3. What are collisions ? Exptain the types of Collisions ? Develop the theory of one dimensionalelastic collision?4. State and prove law of conservation of energy in case of free fallins body.

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5. State and prove the principle of conservation of angular momentum. Explain the principle ofconservation of angular momentum with examples.

6. Define Simple Harmonic Motion. Show that the motion of (point) projection of a particleperforming uniform circular motion, on any diameter, is simple harmonic.

7. show that the motion of a simpte pendulum is simple harmonic and hence derive an equationfor its time period (T = 2n r/ t I g). What is seconds pendulum ?

8. State Boyle's Law and Charle's law. Hence derive ideal gas equation. Which of the two lawsls better for the purpose of thermometrv and Why?

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189. State and explain Newton's law of Cooling. State the conditions under which Newton's law ofcooling is applicable.

A body cools down from 600 C to 500C in 5 minutes and to 400C in another 8 minutes. Findthe temperature of the surroundings.

10. Explain reversible and irreversible processes. Describetheworking of carnet engine.Obtain an expression for the efficiency?

11 . State second law of thermodvnamics. How is heat enqine different from a refriqerator?

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Physics 1(EM) (1)