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Ear, , , , , , , X, , 7. fs per the latest Reduced and Bifu reated S demic 3, Seles yllabus for Academic Y 3, Z ce fOr Semester. 2 Examination to be held in March-April, 2022 2021-22, , , , , me Cee, , , , , , , , Physics =~, , Question Bank, with, , Model Test Papers, , For Class 10, , Semester-2 Examination 2022, , CISCE’s Modified Assessment Plan for Academic Year 2021-22, Reduced and Bifurcated Syllabus for Semester-2 Examination, Chapterwise Summary and Important Points, , Chapterwise Question Bank having all varieties of expected, Questions with answers for Semester-2 Examination to be held in, , March-April, 2022, > Specimen Question Paper (Solved) for Semester-2 Examination, issued by CISCE, , > 5 Model Test Papers based on the latest specimen question, paper issued by CISCE for Semester-2 Examination to be held in, , March-April, 2022, , \ aati, vvvy, , , , , , GOYAL BROTHERS PRAKASHAN, NEW DELHI .
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CONTENTS, , J ESECTION A] QUESTION BANK, , , , UNIT 3: SOUND, 1. Sound, , UNIT 4: ELECTRICITY AND MAGNETISM, 2. Electric Circuits, Resistance and Ohm’s Law, 3. Electric Energy, Power and Household Circuits, , 4, A. Electromagnetism, B. Magnetic Effects of Electric Current, , C. Electromagnetic Induction, , UNIT 5 : HEAT, 5. Calorimetry, , UNIT 6 : MODERN PHYSICS, 6. Nuclear Physics, , "SECTION B : SPECIMEN QUESTION PAPER, , , , 10-31, 32-44, 45-56, , 57-75, , 76-87, , [Released by CISCE for Semester-2 Examination to be held in March-April, 2022], , e Specimen Question Paper (Solved), , SECTION C : MODEL TEST PAPERS, [Based on the Latest Specimen Question Paper released by CISCE], , e Model Test Paper 1 (Unsolved), e Model Test Paper 2 (Unsolved), e Model Test Paper 3 (Unsolved), e Model Test Paper 4 (Unsolved), , e Model Test Paper 5 (Unsolved), , 88-94, , 95-97, 98-100, 101-104, 105-108, , 109-112
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4. Natural or Free vibrations : The vibrations produced in a body, on being slightly disturbed from, its mean position, are called free vibrations., , 2. Natural time period : The time period of a body executing one free vibration is called natural, time period., , 3. Natural frequency : The number of vibrations executed by a freely vibrating body in one second, is called natural frequency., , 4. Damped vibrations : The periodic vibrations of continuously decreasing amplitude in the presence, of resistive force are called damped vibrations., , 5, Forced vibrations : The vibrations which take place under the influence of external periodic force, , are called forced vibrations., OR, , When a body vibrates with a frequency, other than its own natural frequency, then the body is said, to produce forced vibrations., , 6. Resonance : It is defined as the phenomenon, when the frequency of an applied external force is, equal to the natural frequency of the body on which force is applied, such that it readily takes up, , vibrations and begins to vibrate with increased amplitude., 7. Musical sound : A sound which has a pleasant effect on ears and is generally acceptable is called, musical sound., 8. Noise : A sound which has a jarring (unpleasant) effect on the ears and is generally unacceptable, is called noise., 9. Differences between musical sound and noise:, A musical sound has :, (i) pleasant effect on ears, (ii) proceeds at regular intervals of time in quick succession, (iii) no sudden change in the frequency; weavelength or amplitude., A noise has :, (i) jarring effect on ears, (ii) proceeds at irregular intervals of time, (iii) and there is a sudden change in wavelength frequency and amplitude., 10. Characteristics of musical sound are : (i) Pitch, (ii) Loudness, (iii) Quality of sound., 11. Pitch : The characteristic which enables us to differentiate between two sounds of equal loudness, coming from different sources and having different frequencies., 12. Intensity of sound : The rate of flow of sound energy per unit area is called intensity of sound., 13. Loudness of sound : The rate ‘of flow of sound energy per unit area and its effect on ears is, collectively called loudness., 14. Loudness of sound is, (i) Directly proportional to the square of amplitude, (ii) Inversely proportional to the square of distance between the source of sound and observer, (iii) Directly proportional to the density of medium, in which sound energy travels., , , , Goyal's ICSE Physics Question Bank with MTP Class 10 for Semester-2 Examination el
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Quality or timbre : The property by which two notes of ‘same frequency and same loudness car, be distinguished from each other because of the difference in waveforms is called quality or timbre, , 16. The loudness. of sound is measured in decibel (dB)., 17. Loudness of sound is considered normal, if it is between 50 dB to 60 dB. d, 18. Noise pollution : The disturbance produced in the environment by undesirable loud and harsh sound 3, , is called noise pollution., 19. The noise pollution results in the lack of concentration and loss of work efficiency. It can lead to |, , anger, tension and depression. It can cause deafness., , 15., , , , , , Tick (“) the most appropriate option., 1. Water from a tap is allowed to fall in a vessel with a thin neck. The pitch of sound produced, by falling water with the volume of water in the vessel., (a) decreases (b) increases (c) remains same (d) none of these, 2. The amplitude of forced vibrations is generally than the amplitude of applied, external force., , (a) more (b) less (c) equal to (d) none of the these, , 3. A tuning fork has a frequency of 212 Hz. It will produce resonance in a wooden board of —, frequency, (a) 106 Hz (b) 318 Hz (c) 212 Hz (d) 448 Hz, , 4. Two notes are produced from a flute and piano, such that they have same loudness and same, pitch. The notes so produced differ in their :, , (a) waveform (b) wavelength (c) frequency (d) speed, 5. The voice of women is shrill as compared to men because of the difference in their :, (a) speed (b) loudness (c) frequency (d) all of these, , 6. The sound produced by two tuning forks A and B have same amplitude and same waveform,, but the frequency of A is three times more than B. In such a case :, (a) quality of sound of A differs from B, (b) the note produced by A is shriller than B, (c) the note produced by B is shriller than A, (d) the note produced by A has more speed than B., 7. The natural vibrations are the simple harmonic vibrations under the restoring force in which :, (a) amplitude remains constant, (b) frequency remains constant, (c) either (a) or (b), (d) both (a) and (b), 8. The vibrations of a constant amplitude can occur only in, , (a) solids (b) liquids (c) gases (d) vacuum, 9. The periodic vibrations of continuously decreasing amplitude in the presence of resistive force, are called, (a) natural vibrations (b) free vibrations, (c) damped vibrations (d) forced vibrations |, , 10. If the frequency of the external force is much different from the natural frequency of the body,, the amplitude of oscillations is, , (a) very large (b) large (c) very small (d) any of these, 2 Goyal’s ICSE Physics Question Bank with MTP Class 10 for Semester-2 Examination
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11. Resonance is a special case of ., (a) natural vibrations (b) free vibrations (c) damped vibrations (d) forced vibrations, 12. In natural vibrations, the vibrations are only under the, , (a) damping force (b) frictional force, (c) restoring force (d) external periodic force, 13. By increasing the amplitude of a sound wave, its, (a) pitch decreases (b) loudness increases, (c) loudness decreases (d) pitch increases, ANSWERS i, , 1.(b) 2(b) 3. 4@ 5) 60) 72.@ 8 (4) 9.6) Ah (), 1.) 12. 13-6), , Il. 3 MARKS QUESTIONS, ——————e, , 1. (a) A tuning fork is vibrating in air. State whether the vibrations are natural or damped?, (b) State two differences between light waves and sound waves., Ans. (a) Damped., (b) (i) Light waves do not need material medium for their propagation, whereas, sound waves, need material medium for their propagation., , (ii) Light waves are electromagnetic waves in nature, whereas sound waves are mechanical, waves., , 2. (a) Name the characteristic of sound which enables one to distinguish the sound of two musical, instruments even if they are of same pitch and same loudness., (b) Two waves of same pitch have their amplitudes in the ratio 2 : 3., (i) What will be the ratio of their loudness?, (ii) What will be the ratio of their frequencies?, Ans. (a) Quality or timbre., (b) (i) The ratio of their loudness = (2)? : (3)? = 4: 9., (ii) As the sound waves are of same pitch, therefore, ratio of their frequencies is 1 : 1., 3. (a) Name the unit used for measuring the sound level., (b) A vibrating tuning fork is held at a certain fixed length of an air column when a loud sound, is heard. What phenomenon is responsible for it? How does the phenomenon occur?, Ans. (a) Decibel (dB) is the unit used for measuring sound level., (b) The phenomenon is resonance. It is because, at some particular length of air column, the natural, frequency of the vibrating air column becomes equal to the natural frequency of tuning fork., These frequencies reinforce each other and hence, produce loud sound or resonance., , 4. (a) A person walking past a railway line at the middle of night hears a ringing sound along with, the sound of his footsteps. Why?, , (b) What change do you expect in the characteristics of a musical note when the following are, increased :, (i) amplitude, (ii) frequency?, Ans. (a) When the vibrations produced by the feet of the person are impressed on the rails, they vibrate, with forced vibrations, thereby producing a ringing sound., (b) (i) With the increase in amplitude, the loudness of musical note increases., , (ii) With the increase in frequency the pitch of musical note increases, i.e., the musical note, increases, i.e., the musical note becomes shrill., , Goyal’s ICSE Physics Question Bank with MTP Class 10 for Semester-2 Examination E og
