{"id":231,"date":"2020-04-20T11:04:37","date_gmt":"2020-04-20T11:04:37","guid":{"rendered":"https:\/\/schoolpk.org\/mcq\/?p=231"},"modified":"2020-10-18T23:10:14","modified_gmt":"2020-10-18T18:10:14","slug":"physics-10th-class-chapter-10-sq","status":"publish","type":"post","link":"https:\/\/murreeroad.org\/physics10\/physics-10th-class-chapter-10-sq\/","title":{"rendered":"Physics 10th Class Chapter 10-sq"},"content":{"rendered":"

Unit 10 – Simple Harmonic Motion and Waves(Short Questions)<\/span><\/strong><\/p>\n

Q.1 <\/strong>What is meant by oscillation?<\/strong><\/a><\/p>\n

Q.2 <\/strong>Define Simple Harmonic Motion.<\/strong><\/a><\/p>\n

Q.3 Define Hooke’s Law. Give its expression.<\/a><\/strong><\/p>\n

Q.4 How does stiffness of the spring affect the value of k?<\/a><\/strong><\/p>\n

Q.5 What is the function of restoring force during oscillatory motion?<\/a><\/strong><\/p>\n

Q.6 Which type of forces are acting on a displaced pendulum? OR Which component of force act as restoring force during the oscillation of simple?<\/a><\/strong><\/p>\n

Q.7 Define Time Period and Write down formulas of Time Period for mass attached to a\u00a0spring and for simple Pendulum?<\/a><\/strong><\/p>\n

Q.8 Define following terms which characterize simple harmonic motion.<\/a><\/strong><\/p>\n

Q.9 Write down important features of Simple Harmonic Motion.<\/a><\/strong><\/p>\n

Q.10 Define time period and frequency in case of vibratory motion.<\/a><\/strong><\/p>\n

Q.11 Differentiate between mechanical waves and electromagnetic waves.<\/a><\/strong><\/p>\n

Q.12 Differentiate between transverse waves and compressional or longitudinal waves.<\/a><\/strong><\/p>\n

Q.13 Write down the relationship between frequency and time period.<\/a><\/strong><\/p>\n

Q.14 If we double the length of the pendulum then what will be the time period?<\/a><\/strong><\/p>\n

Q.15 Find the time period and frequency of a simple \u00a0pendulum 1.0 m long at a location where g = 10.0 m s-2<\/sup> .<\/a><\/strong><\/p>\n

Q.16 What is meant by damped oscillation?<\/a><\/strong><\/p>\n

Q. 17 How does the mechanical energy of system reduce?<\/a>\u00a0 \u00a0 <\/strong><\/p>\n

Q. 18 How a wave can be defined? In which categories are these divided?<\/a><\/strong><\/p>\n

Q. 19 Define electromagnetic waves and give its examples.<\/a><\/strong><\/p>\n

Q.20 Define mechanical waves. Give examples.<\/a><\/strong><\/p>\n

Q.21\u00a0Do the mechanical waves pass through a space?<\/a><\/strong><\/p>\n

Q.22 Define longitudinal or compressional waves?<\/a><\/strong><\/p>\n

Q. 23 Differentiate between crest and trough?\u00a0<\/a><\/strong><\/p>\n

Q.24 Define transverse waves?<\/a><\/strong><\/p>\n

Q.25 What is wave equation?<\/a><\/strong><\/p>\n

Q.26 A wave moves on a slinky with frequency of<\/a><\/strong>
\n4 Hz and wavelength of 0.4 m. What is the speed of the wave?<\/strong><\/a><\/p>\n

Q. 27 Why bright lines are seen on the screen of the ripple tank?<\/a><\/strong><\/p>\n

Q.28 Why dark lines are seen on the screen of the ripple tank?<\/a><\/strong><\/p>\n

Q.29 How can we generate circular waves in a ripple tank?<\/a><\/strong><\/p>\n

Q. 30 Why does wavelength decrease in shallow part of water?<\/a><\/strong><\/p>\n

Q. 31 How diffraction is useful in daily life?<\/a><\/strong><\/p>\n

Q. 32 How do ocean waves cause destruction?<\/a>\u00a0\u00a0\u00a0 <\/a><\/strong><\/p>\n

From Board Papers<\/strong><\/span><\/p>\n

Q.1 What is spring constant? Write its formula.<\/a><\/strong><\/p>\n

Q.2 Define waves equation and write its formula.<\/a><\/strong><\/p>\n

Q. 3 What is meant by wavelength?<\/a><\/strong><\/p>\n

Q.4 What is the function of Ripple Tank?<\/a><\/strong><\/p>\n

Q. 5 Define refraction of waves.<\/a><\/strong><\/p>\n

Q. 6 Define Restoring Force.<\/a><\/strong><\/p>\n

Q.7 Define vibratory motion.<\/a><\/strong><\/p>\n

Q.8 Define SHM. Also write features of SHM.<\/a><\/strong><\/p>\n

Q.9 . Define simple pendulum. Write down its time period equation\/formula.<\/a><\/strong><\/p>\n

Q.10 What is meant by vibration?<\/a><\/strong><\/p>\n

Q.11 Define damped oscillations. Give its two examples for daily life.<\/a><\/strong><\/p>\n

Q.12 Define wave motion.<\/a><\/strong><\/p>\n

Q.13 Define longitudinal waves.<\/a><\/strong><\/p>\n

Q.14 Define Transverse Waves.<\/a><\/strong><\/p>\n

Q. 15 Define electromagnetic waves. Also give an example.<\/a><\/strong><\/p>\n

Q. 16 A ball is dropped from a certain height onto the floor and keeps bouncing. Is the motion of the ball is simple harmonic? Explain.<\/a><\/strong><\/p>\n

Q.17 Define wave.<\/a><\/strong><\/p>\n

Q.18 Define Crest and Trough.<\/a><\/strong><\/p>\n

Q.19 What is meant by compression?<\/a><\/strong><\/p>\n

Q.20 Define mechanical waves and give example.<\/a><\/strong><\/p>\n

Q.21 What is difference between Mechanical Waves and Electromagnetic Waves?<\/a><\/strong><\/p>\n

Q.22 What is the difference between longitudinal and transverse waves?<\/a><\/strong><\/p>\n

Q.23 Define diffraction of waves.<\/a><\/strong><\/p>\n

Q.24 Define reflection of waves.<\/a><\/strong><\/p>\n

Q.25 State Hook’s law.<\/a><\/strong><\/p>\n

Q.26 Define a time period. Write the formula of time period of a simple pendulum.<\/a><\/strong><\/p>\n

Q.27 Define frequency and write its unit.<\/a> <\/strong><\/a><\/p>\n

1. What is meant by oscillation?<\/strong><\/p>\n

Answer:<\/strong> When <\/span>a <\/span>body <\/span>moves <\/span>back <\/span>a<\/span>n<\/span>d <\/span>forth <\/span>or <\/span>to <\/span>and <\/span>fro <\/span>about <\/span>its <\/span>mean <\/span>position<\/span>. <\/span>is <\/span>called <\/span>vibration <\/span>or <\/span>oscillation<\/span>.<\/span><\/p>\n

Example<\/strong>:<\/strong> Motion of the Simple Pendulum.<\/span><\/p>\n

<\/a>\"\"<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

2. Define Simple Harmonic Motion.<\/strong><\/p>\n

Answer:<\/strong> The <\/span>acceleration <\/span>of <\/span>a <\/span>body <\/span>executing <\/span>SHM <\/span>is <\/span>directly <\/span>proportional <\/span>to <\/span>the <\/span>displacement <\/span>of <\/span>the <\/span>body <\/span>from <\/span>the <\/span>mean <\/span>position <\/span>and <\/span>is <\/span>always <\/span>directed <\/span>towards <\/span>the <\/span>mean <\/span>position \u221d<\/span><\/p>\n

Mathema<\/strong>tically<\/strong> :\u00a0 \u00a0 a \u221d – x<\/span><\/p>\n

Where <\/span>a <\/span>is <\/span>acceleration<\/span>. <\/span>It <\/span>is <\/span>always <\/span>directed <\/span>towards <\/span>the <\/span>mean <\/span>position <\/span>a<\/span>nd <\/span>x is <\/span>displacement <\/span>from <\/span>mean <\/span>position<\/span>.<\/a><\/span><\/p>\n

3. Define Hooke’s Law. Give its expression.<\/strong><\/p>\n

Answer: <\/strong>According <\/span>to <\/span>Hooke<\/span>‘<\/span>s <\/span>law <\/span>the <\/span>exerted <\/span>force <\/span>is <\/span>directly <\/span>proportional <\/span>to <\/span>change <\/span>in <\/span>length<\/span>.\u00a0<\/span><\/p>\n

F \u221d\u00a0 x<\/a><\/span><\/p>\n

4. How does stiffness of the spring affect the value of k?<\/strong><\/p>\n

Answer: <\/span><\/strong>The <\/span>value <\/span>of <\/span>k <\/span>is <\/span>a <\/span>measure <\/span>of <\/span>the <\/span>stiffness <\/span>of <\/span>the <\/span>spring<\/span>. <\/span>Stiff <\/span>springs <\/span>have <\/span>large <\/span>k <\/span>values<\/span>, <\/span>and <\/span>soft <\/span>springs <\/span>have <\/span>small <\/span>k values<\/span>.<\/a><\/span><\/span><\/strong><\/p>\n

5. What is the function of restoring force during oscillatory motion?<\/strong><\/p>\n

Answer: <\/strong>A <\/span>restoring <\/span>force <\/span>always <\/span>pushes <\/span>or <\/span>pulls <\/span>the <\/span>object <\/span>performing <\/span>oscillatory <\/span>motion <\/span>towards\u00a0<\/span>the <\/span>mean position<\/span>.\u00a0<\/span><\/p>\n

F = – k x<\/a><\/p>\n

6. Which type of forces are acting on a displaced pendulum? OR Which component of force act as restoring force during the oscillation of simple?<\/strong><\/p>\n

Answer: <\/strong>The <\/span>restoring <\/span>force <\/span>that <\/span>causes <\/span>the <\/span>pendulum <\/span>to <\/span>undergo <\/span>simple <\/span>harmonic <\/span>motion <\/span>is <\/span>the\u00a0<\/span>component <\/span>of <\/span>gravitational <\/span>force <\/span>mg <\/span>sin\u03b8<\/span>\u00a0<\/span><\/i>tangent <\/span>to <\/span>the <\/span>path <\/span>of <\/span>motion<\/span>.<\/a><\/span><\/p>\n

\"\"<\/p>\n

7. Define Time Period and Write down formulas of Time Period for mass attached to a\u00a0spring and for simple Pendulum?<\/strong><\/p>\n

Answer: <\/strong><\/p>\n

Time Period (T):<\/strong><\/p>\n

Time <\/span>required <\/span>to <\/span>complete <\/span>one <\/span>vibration <\/span>is <\/span>called <\/span>time <\/span>period<\/span>. <\/span>It <\/span>is <\/span>denoted <\/span>by <\/span>T<\/span>.<\/span><\/p>\n

The time period T of the simple harmonic motion of a mass m attached to a spring is given by the following equation:<\/p>\n

Formula <\/b>for <\/b>the <\/b>time <\/b>period <\/b>of <\/b>simple pendulum:<\/a><\/b><\/p>\n

 <\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

8. Define following terms which characterize simple harmonic motion. <\/strong><\/p>\n

(i) Vibration\u00a0 (ii) Time period (iii) Frequency\u00a0 (iv) Amplitude \u00a0(v) Displacement\u00a0<\/strong><\/p>\n

Answer:<\/strong> (i) <\/strong>Vibration<\/b>: <\/b>One <\/span>complete <\/span>round <\/span>trip <\/span>of <\/span>a <\/span>vibrating <\/span>body <\/span>a<\/span>b<\/span>out <\/span>its <\/span>mean <\/span>position <\/span>is <\/span>called <\/span>one <\/span>vibration<\/span>.\u00a0<\/span><\/p>\n

(ii) Time period: The <\/span>time <\/span>taken <\/span>by <\/span>a <\/span>vibrating <\/span>body <\/span>to <\/span>complete <\/span>one <\/span>vibration <\/span>is <\/span>called <\/span>time <\/span>period.<\/span><\/strong><\/p>\n

(iii) Frequency: <\/strong>Th<\/span>e <\/span>number <\/span>of <\/span>vibrations <\/span>per <\/span>cycle <\/span>of <\/span>a <\/span>vibrating <\/span>body <\/span>in <\/span>one <\/span>second <\/span>is <\/span>called <\/span>its <\/span>frequency<\/span>. <\/span>It <\/span>is <\/span>reciprocal <\/span>of <\/span>time <\/span>period <\/span>i<\/span>.<\/span>e <\/span>f<\/span>= <\/span>1<\/span>\/<\/span>T\u00a0<\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

(iv) Amplitude: The <\/span>displacement <\/span>of <\/span>a <\/span>vibrating <\/span>body <\/span>on <\/span>either <\/span>side <\/span>from <\/span>its <\/span>mean <\/span>position <\/span>to <\/span>extreme <\/span>position <\/span>is <\/span>called <\/span>its <\/span>amplitude<\/span>.<\/span><\/strong><\/p>\n

\u00a0(v) Displacement: Distance <\/span>covered <\/span>by <\/span>the <\/span>vibrating <\/span>body<\/span>\u00a0<\/span>at <\/span>any <\/span>instant <\/span>during <\/span>the <\/span>vibration <\/span>from <\/span>mean <\/span>position<\/span>.<\/a> <\/span><\/strong><\/p>\n

Q.9 Write down important features of Simple Harmonic Motion.<\/strong><\/p>\n

\u00a0<\/span>Important <\/span>features <\/span>of <\/span>SHM <\/span>are <\/span>summarized <\/span>as<\/span>:\u00a0<\/span><\/p>\n

    \n
  1. A <\/span>body <\/span>executing<\/span>. <\/span>SHM <\/span>always <\/span>vibrates <\/span>about <\/span>a <\/span>fixed <\/span>position<\/span>. <\/span><\/li>\n
  2. Its <\/span>acceleration <\/span>is <\/span>always <\/span>directed <\/span>towards <\/span>the <\/span>mean <\/span>position <\/span><\/li>\n
  3. The <\/span>magnitude <\/span>of <\/span>acceleration <\/span>is <\/span>always <\/span>directly <\/span>proportional <\/span>to <\/span>its <\/span>displacement <\/span>from the mean position i.e. acceleration will be zero at the mean position while it will be maximum at the extreme positions.<\/li>\n
  4. Its <\/span>velocity <\/span>is <\/span>maximum <\/span>at <\/span>the <\/span>mean <\/span>position <\/span>and <\/span>zero <\/span>on <\/span>the <\/span>extreme <\/span>positions.<\/a><\/span><\/li>\n<\/ol>\n

    Q.10 Define time period and frequency in case of vibratory motion.<\/strong><\/p>\n

    Answer:<\/strong><\/p>\n

    Time Period<\/b><\/p>\n

    vibratory motion:<\/p>\n

    T<\/span>h<\/span>e <\/span>time <\/span>required <\/span>to <\/span>complete <\/span>one\u00a0<\/b>vibration is known as time period.<\/span><\/p>\n

    Waves:<\/p>\n

    The time required to pass one wave from a certain point is called time period.<\/p>\n

    T = 1\/f<\/p>\n

    Frequency:<\/strong><\/p>\n

    vibratory motion:<\/p>\n

    The number of vibrations completed in one second is known as frequency<\/p>\n

    Waves:<\/p>\n

    The number of waves passing through a certain point in one second is known as frequency.<\/p>\n

    f = 1\/T<\/a><\/p>\n

    Q.11 Differentiate between mechanical waves and electromagnetic waves.<\/strong><\/p>\n

    Answer:\u00a0<\/strong><\/p>\n

    Mechanical <\/b>Waves:<\/b><\/p>\n

    The <\/span>waves <\/span>which <\/span>require <\/span>a <\/span>material <\/span>medium <\/span>for their propagation are known as mechanical waves.<\/span><\/p>\n

    Examples:<\/strong><\/p>\n

    i. Sound <\/span>waves\u00a0<\/span><\/p>\n

    ii. Waves <\/span>produced <\/span>on <\/span>a <\/span>rope\u00a0<\/span><\/p>\n

    iii. Water <\/span>waves\u00a0<\/span><\/p>\n

    Electromagnetic Waves:<\/strong><\/p>\n

    The <\/span>waves <\/span>which <\/span>can <\/span>propagate <\/span>with <\/span>or \u00a0without material medium are known electromagnetic waves.<\/span><\/p>\n

    Examples:<\/strong><\/p>\n

    i. X<\/span>–<\/span>rays\u00a0<\/span><\/p>\n

    ii. Radio <\/span>waves<\/span><\/p>\n

    iii. Heat <\/span>and <\/span>light <\/span>waves<\/a><\/span><\/p>\n

    Q.12 Differentiate between transverse waves and compressional or longitudinal waves.<\/strong><\/p>\n

    Transverse <\/b>Waves:<\/b><\/p>\n

    The <\/span>waves <\/span>in <\/span>which <\/span>the <\/span>direction <\/span>of <\/span>vibratory motion of particles of medium is perpendicular to the direction of propagation of waves are called transverse waves.<\/span><\/p>\n

    Examples:<\/strong><\/p>\n

    i. Waves <\/span>produced <\/span>in <\/span>a <\/span>rope\u00a0<\/span><\/p>\n

    ii. Water <\/span>waves<\/span><\/p>\n

    Compressional <\/b>or <\/b>Longitudinal <\/b>Wave<\/b>s:<\/b><\/p>\n

    The <\/span>waves <\/span>in <\/span>which <\/span>the <\/span>direction <\/span>of <\/span>vibratory motion of particles of medium is parallel to the direction of propagation of waves are called compressional or longitudinal waves.<\/span><\/p>\n

    Examples: <\/strong>Sound waves<\/a><\/p>\n

    Q.13 Write down the relationship between frequency and time period.<\/strong><\/p>\n

    Answer:<\/strong> Frequency <\/span>is <\/span>a <\/span>reciprocal <\/span>of <\/span>time <\/span>period <\/span>(<\/span>They <\/span>have <\/span>inverse <\/span>relationship<\/span>)<\/span>.\u00a0<\/span><\/p>\n

    f = 1\/T<\/a><\/p>\n

    Q.14 If we double the length of the pendulum then what will be the time period?<\/strong><\/p>\n

    Answer:<\/strong>\u00a0 As we know that<\/p>\n

    \"\"<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    So<\/p>\n

    \"\"<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Hence Time Period is \u221a2 times of time period. <\/a><\/strong><\/p>\n

    Q.15 Find the time period and frequency of a simple \u00a0pendulum 1.0 m long at a location where g = 10.0 m s-2<\/sup> .<\/strong><\/p>\n

    Answer:<\/strong><\/p>\n

    <\/a>\"\"<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Q.16 What is meant by damped oscillation?<\/strong><\/p>\n

    Answer:\u00a0<\/strong>The <\/span>oscillations <\/span>o<\/span>f <\/span>a <\/span>system <\/span>in <\/span>the <\/span>presence <\/span>of <\/span>some <\/span>resistive <\/span>force <\/span>are <\/span>damped\u00a0<\/span>Oscillations<\/span>.<\/a><\/span><\/p>\n

    Q. 17 How does the mechanical energy of system reduce?<\/strong><\/p>\n

    Answer: <\/strong>The <\/span>friction <\/span>reduces <\/span>the <\/span>mechanical <\/span>ene<\/span>rg<\/span>y <\/span>of <\/span>the <\/span>system <\/span>as <\/span>time <\/span>passes, <\/span>and <\/span>the <\/span>motion\u00a0<\/span>is <\/span>said <\/span>to <\/span>be <\/span>damped<\/span>, <\/span>this <\/span>damping <\/span>progressively <\/span>reduces <\/span>the <\/span>amplitude <\/span>of <\/span>the <\/span>motion<\/span>. <\/a><\/span><\/p>\n

    Q. 18 How a wave can be defined? In which categories are these divided?<\/strong><\/p>\n

    Answer:<\/strong><\/p>\n

    A <\/span>wave <\/span>is a <\/span>disturbance <\/span>in <\/span>the <\/span>medium <\/span>which <\/span>causes <\/span>the <\/span>particles <\/span>of <\/span>the <\/span>medium <\/span>to <\/span>undergo <\/span>vibratory <\/span>motion <\/span>about <\/span>their <\/span>mean <\/span>position <\/span>in <\/span>equal <\/span>intervals <\/span>of <\/span>time<\/span>.<\/span><\/p>\n

    There <\/span>are <\/span>two <\/span>categories <\/span>of <\/span>waves<\/span>. <\/span>(<\/span>i<\/span>) <\/span>Mechanical <\/span>waves <\/span>(<\/span>ii<\/span>) <\/span>Electromagnetic <\/span>Waves <\/a><\/span><\/p>\n

    Q. 19 Define electromagnetic waves and give its examples.<\/strong><\/p>\n

    Answer:<\/strong> Wav<\/span>es <\/span>which <\/span>do <\/span>not <\/span>require <\/span>any <\/span>medium <\/span>for <\/span>their <\/span>propagation are <\/span>give <\/span>called\u00a0<\/span>electromagnetic <\/span>waves <\/span><\/p>\n

    Examp<\/b>l<\/b>es<\/b>:\u00a0<\/b><\/p>\n