Page 1 :
Phaltan Education Society’s, MUDHOJI JR. COLLEGE, PHALTAN, Model Question paper on Annual Examination 2021-22, Date:_ _/_ _ /2022, Time: 3 Hrs., , STD. XI(Sci.), Subject: Physics, , Roll No., Marks:70, , Instructions: The question paper is divided into four sections, Section A:, Q. No. 1 Contains TEN multiple choice questions carrying One mark each., Q. No. 2 Contains EIGHT very short answer type questions carrying One mark, each., Section B:[Attempt any EIGHT], Q. No. 3 to Q. No. 14 Contains TWELVE short answer type questions carrying, Two marks each., Section C:[Attempt any EIGHT], Q. No. 15 to Q. No. 26 Contains TWELVE short answer type questions carrying, Three, marks each., Section D: [Attempt any Three], Q. No. 27 to Q. No. 31Contains Five long answer type questions carrying Four, marks each., Note:- 1) Use of Logarithmic Table is allowed. Use of calculator is not allowed., 2) Figures to the right indicates full marks., 3) For each MCQs, correct answer must be written along with its alphabet.

Page 2 :
SECTION-A, Q. 1 Select and write the correct answer of the following sub questions., 10, 1) ) [𝑀1 𝐿1 𝑇 −2 ]is the dimensional formula for ………., a) velocity, , b) acceleration, , c) force, , d) work, , 2) Which of the following is a Vector ?, a) Speed, , b) displacement, , c) mass, , d) time, , 3) A projectile projected with certain velocity reaches ground with, magnitude)……, a) Zero velocity, , b) smaller velocity c) same velocity d) relative velocity, , 4) Which of the following is not unit of thermal conductivity………………., a) J/ms°C, , b) K cal/m2sK, , d) 𝐽/𝑚2 𝑠℃, , c) Watt/m2°C, , 5) The point on stress - strain curve at which strain begins to increase, even withoutincreasing stress is called ………………., a) elastic point, , b) yield point, , c) breaking point, , d) neck point, , 6) The Laplace’s correction in the expression for velocity of sound given by, Newton is needed because sound wave………, a) Are longitudinal, , b) propagate isothermally, , c) Propagate adiabatically, , d) are of long wavelength, , 7) Two charges of 1 C each are placed 1 m a part in free space the force between, them will be…………..., a) 1 N, , b) 9 × 109𝑁, , c) 9 × 10−9𝑁, , d) 10N

Page 3 :
8) The internal resistance of a cell of emf 2 volt is 0.1 ohm it is connect to a, resistance of 0.9 ohm the voltage across the cell will be ………………., a) 0.5 volt, , b) 1.8 volt, , c) 1.95 volt, , d) 3 volt, , 9) A bar magnet of magnetic moment 5.0Am2 has the poles 20cm apart. The pole, strength is ., a) 20Am b) 25Am, , c) 25A/m, , d) 20A/m, , 10) Magnetic lines of force is originate from ….. Pole and end at............Pole, outside the, Magnet, , a) north , north, b) north , south, c) south , north, Q. 2 Answer the following questions., , d) south , south, 8, , 1) State Newton`s law of gravitation., 2) State SI unit and dimensions of thermal resistance, 3) If two cells each of emf 1.8V are connected in series, what is the value of net, emf of combination., 4) State the law of conservation of charge., 5) At what temperature of air will the speed of sound in air gets doubled?, 6) State the types of semiconductor., 7) Define Poisson Ratio., 8) What are radio waves? Give its two uses., SECTION-B, Attempt any EIGHT of the following, Q. 3. Write down the number of significant figures in the following:, a) 0.03𝑚3 b) 9.1 𝑋 10−31, , 16

Page 4 :
Q. 4. If ⃗⃗⃗⃗, 𝑣1 = 3𝑖̂ + 4𝑗̂ + 𝑘̂ and 𝑣, ⃗⃗⃗⃗2 = 𝑖̂ − 𝑗̂ − 𝑘̂ then determine the magnitude of, 𝑣1 + 𝑣, ⃗⃗⃗⃗, ⃗⃗⃗⃗2 ., Q. 5. A particle moves in a circle with constant speed of 15 m/s the radius of the, circle is 2 meter. Determined centripetal acceleration of the particle., Q. 6. Define the term,, i) Longitudinal Strain, ii) Volume stress, .Q. 7. Define coefficient of linear expansion of solid State its unit and dimensions., Q. 8. What is the specific heat of metal if 50 cal of heat is needed to raise 6 Kg, of the metal form 20 ℃ to 60 ℃., Q. 9. Define compressibility. State its SI units and dimensions., Q. 10. State and explain Kepler`s law of period., Q. 11. A tuning fork of frequency 170Hz produces sound waves of wavelength 2m., Calculate speed of sound., Q. 12. Two small spheres 18cm apart have equal negative charges and repel each, other with the force of 6x10-8N. Find the total charge on both spheres. [ (, , 1, 4𝜋𝜖𝑜, , )=, , 9x109 Nm2/c2 ], Q.13. Draw neat and labeled block diagram of the basic elements of a, Communication system., Q. 14 A battery after a long use has an emf 24 V and an internal resistance, 380 ohm. Calculate the maximum current drown from the battery. Can this, battery derive startingmotor of car?, SECTION-C, Attempt any EIGHT of the following, , 24, , Q. 15. The diameter of a sphere is 2.14 cm .calculate the volume of the sphere to

Page 5 :
the correct significant figure., Q. 16. Explain the I-V characteristics of a Reverse biased junction diode., Q. 17. Expression for average acceleration and instantaneous acceleration for the, motion of an object in X-Y plane., Q. 18. A thin aluminum plate has an area 286 cm2 at 20 ℃ . Find its area when it is, heated to 180 ℃. [ β for Aluminium = 4.9×10-5/°C], Q. 19. Calculate the work done in stretching a steel wire of length 2m and cross, sectional area 0.0225 mm2 when a load of 100 N is slowly applied to its free, end.(Young`s modulus of steel = 2x1011N/m2 ), Q. 20. What is the effect of temperature of on the velocity of sound in air?, Q. 21. Find the gravitational force between the sun and the earth. Given mass of, the sun = 1.99x1030 kg, mass of the earth = 5.98 x1024 kg, G = 6.67x10-11 Nm2/kg2,, The average distance between the earth and the sun = 1.5 x 1011 m., Q. 22. Write a note on 1) Primary cell 2) Secondary cell., Q. 23. Calculate the electric field due to a charge of −8 × 10−18𝐶 at the, distance of 5 cm from it., Q. 24. Define the following terms a) Magnetic meridian, b) Magnetic inclination, c) Magnetic declination, Q. 25. Explain the phenomenon of total internal reflection with a neat labeled ray, diagram., Q. 26. What EM spectrum. The speed of light is 3 × 108 m/calculate the, frequency of red light of wavelength of 6.5 × 10−7 m., SECTION-D, Attempt any Three of the following, Q. 27. Derive the expression for apparent frequency when the source is, , 12

Page 6 :
stationary and listeneris moving toward the source., Q. 28. State Newton’s law of cooling., A metal sphere cools from 80℃ to 60℃ in 6 min. How much time with it, take to cool from 60 ℃ to 40 ℃ if the room temperature is 30 ℃., Q. 29. Explain the behavior of metal wire under increasing load., Q. 30. ) In a workshop a worker measures the length of a steel plate with a vernier, calipers having a least count 0.01cm four such measurement of the length, yielded the following values find the mean length the mean absolute error, and the percentage error in the Measured value of the length., Q. 31. Define, i) Absolute refractive index. ii) Relative refractive index., From the given data set, determine dispersive power of its material for, extreme color, 𝑛𝑅 = 1.62, 𝑛𝑣 = 1.66., ##################################################################