This document contains a retrospective sheet from Gokul Academy of Science dated January 10-13, 2012. It includes the following:
1) Questions from January 10th about solving simultaneous equations and defining frequency and how many times a sound source of 100Hz vibrates in a minute.
2) Questions from January 11th about solving systems of equations and defining reverberation and how it can be reduced.
3) Questions from January 12th about solving systems of linear equations, defining longitudinal/transverse waves, and the audible range of sound.
4) Questions from January 13th about finding values of expressions without solving variables explicitly, and defining sound, echo, and the long form of S
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Gokul academy grs
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 - xy = 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
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