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GOKUL ACADEMY OF SCIENCE
                                 15, Near Gajanan High School, New Subhedar Lay-out, Nagpur-24
                                                 Ph.No.0712-2743707 & 6466067

Date :10-01-2012                         Gokul Retrospection sheet 01        Std :IX-State
                                                  ( G.R.S. -01)

10 - 01 - 12
Q.1    Find the following simultaneous equations.
      i) 2x + y = 5 : 3x - y = 5
    ii) x + y – 8 =       x + 2y – 14 =     3x + y - 12
           2                 3                11
Q.2 i) The frequency of a source of sound is 100Hz. How many time does it vibrate
        in a minute
     ii) Define frequency

11 – 01 – 12
Q.1    i) Solve: 2x – 3y =14; 5x + 2y =16

       ii) x + y     - x–y      = 1
            4           3

Q.2    i) Define reverberation
       ii) How can it be reduced

12 -01 – 12
Q.1    i) 2x + 3y = - 4 ;    x - 5y = 11
       ii) 5y – 3x = 14 ;   3y – 2x = 1

       iii) 2x – y – 3 = 0 ; 4x – y – 5 = 0

Q.2    Define :
                  a) Longitudinal waves       b) Transverse waves

       2) Which range is known as audible range.

13 -01 -12
Q.1    Find the values of (x + y) and (x - y) from the examples given below without
       solving for x and y

       i) 5x + 7y =17 ; 7x + 5y = 19
       ii) 7x -5y = -1 ; 5x -7y = - 11
Q.2    1. Define
               a) Sound b) Echo
       2. Write long form of SONAR



                                                                  Go Cool For Exam
                                                                  .

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  • 1. GOKUL ACADEMY OF SCIENCE 15, Near Gajanan High School, New Subhedar Lay-out, Nagpur-24 Ph.No.0712-2743707 & 6466067 Date :10-01-2012 Gokul Retrospection sheet 01 Std :IX-State ( G.R.S. -01) 10 - 01 - 12 Q.1 Find the following simultaneous equations. i) 2x + y = 5 : 3x - y = 5 ii) x + y – 8 = x + 2y – 14 = 3x + y - 12 2 3 11 Q.2 i) The frequency of a source of sound is 100Hz. How many time does it vibrate in a minute ii) Define frequency 11 – 01 – 12 Q.1 i) Solve: 2x – 3y =14; 5x + 2y =16 ii) x + y - x–y = 1 4 3 Q.2 i) Define reverberation ii) How can it be reduced 12 -01 – 12 Q.1 i) 2x + 3y = - 4 ; x - 5y = 11 ii) 5y – 3x = 14 ; 3y – 2x = 1 iii) 2x – y – 3 = 0 ; 4x – y – 5 = 0 Q.2 Define : a) Longitudinal waves b) Transverse waves 2) Which range is known as audible range. 13 -01 -12 Q.1 Find the values of (x + y) and (x - y) from the examples given below without solving for x and y i) 5x + 7y =17 ; 7x + 5y = 19 ii) 7x -5y = -1 ; 5x -7y = - 11 Q.2 1. Define a) Sound b) Echo 2. Write long form of SONAR Go Cool For Exam .