9 SCIENCE 1
Gokhale Education Society's
HAL Highschool English Medium
Online Annual Exam 2021
Sub      : Science 1
Std       : 9th
Marks :25
Time   : 45 min
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Student Name(In capital) (Surname name father name) *
Division - *
Roll Number - *
1)  . ..... is used with tamarind while cooking to help in maintaining the pH of our body. *
2) A .......... converges the rays of light falling on it. *
3) Common salt is......... in nature. *
4) Which are the gases formed in a biogas plant. *
5) The speed of sound in air at 22 degree Celsius is...... *
6) A distinct Eco can be heared if the reflecting surface is at a minimum distance of_____ *
7) Radioactive isotopes are used in....... *
8)The red colour use on Rang Panchami contain high proportion of ______ . *
9)........ is used for bleaching of cloth. *
10)The Gaint Metrewave Radio Telescope(GMRT)is located at..... *
11) The most accurate method of measuring the pH solution is....... *
12) Which allotrope of carbon is used to cut glass? *
13) Atomic number of carbon atom is.......... *
14) Which is type of coal? *
15) Gamma ray have..... *
16)In sonography which waves are used? *
17) Sound of frequency greater than 20kHz is called..... *
18) Which acid is formed when carbon dioxide dissolves in water? *
19) Carbon is______ in all solvents. *
20)_____ is used for disinfection of drinking water. *
21)The pH range of human blood is_______ . *
22) The velocity of sound is highest in_______.
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23) Mirror used by a dental surgeon is........ *
24) The focal length of spherical mirror with radius of curvature 30cm is_________. *
25)_______ is used to extinguish fire. *
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