Questions Bank for second semester
Class 9th std
QIA) Choose the correct alternative,
and rewrite the statements :-
1) In which of the following Carbon dioxide is not used ______.
A) Fire
extinguisher
B) Cold storage
C) Ethanol production
2)The mirror whose inner surface is reflecting surface
is called _______
A)Plane B) Concave C)Convex
3) _______mirror is used in a periscope .
A) Convex
B) Plane
C) Concave
4) _________ is the crystalline form of Carbon .
A)Graphite B) Coal
C) Charcoal
5)The centre of the mirror surface is called its____.
A)pole B) radius C) focus
6) ….. is the essential element in all the organic compounds.
A)Carbon,B)Oxygen C) Nitrogen
7) The focal length of a concave mirror is______.
A)Positive B) Negative C) Neutral
8) Methane gas is also called as _______
A)Marsh gas B) water gas C) producer gas gas.
9) A ray of light parallel to the Principal axis of concave mirror after reflection passes through
_______ of the mirror
A) focus B) pole C) centre of curvature
D) radius
10) A _______ image cannot be obtained on a screen.
A) virtual B) real C) magnified D) inverted
11) _______ gases are formed in a biogas plant .
A) CO ,CH4 B) CH4,CO2 C) CO2,O2
D) N2, S2
12)_________ is the property of oxides of non- metals.
A) Acidic B) Basic C) Neutral D) Amphoteric.
13) _______ is a good conductor of heat and electricity
A) Diamond B) Graphite C) Coal D) Coke
, 14) _____ is used in treatment of hyperthyroidism
A) Iodine – 123 B) Iodine-60 C) Cobalt-60 D) Krypton- 85
15) ______ is used in making braed ,cake, dhokla.
A)Sodium Carbonate B) Sodium bicarbonate C) Calcium Carbonate
D) Magnesium Carbonate.
16) _______ is used in disinfecting drinking water .
A) Copper Sulphate B) Alum
C) Bleaching powder D) Sodium Chloride
17) ________ is used in manufacturing of soap and detergents.
A) Sodium Carbonate B) Calcium Carbonate C) Sodium Carbonate
D)Sodium Nitrate.
Q2B) Attempt the following questions :-
1) Say whether True or false:-
1)The focal length of a Concave mirror is negative.
2) Methane is a highly inflammable gas.
3) Carbon dioxide is used in aerated drinks.
4)The image in front of the mirror which can be obtained on a screen is called a Virtual image.
5)The molecular formula of Carbon dioxide is CO.
6) A concave mirror is a diverging mirror.
7) Charcoal is a porous, therefore it has low density.
8 ) The Dye used in lipstick is carmine.
9) Teflon is a polymer of tetrafluoroethene
2) Complete the co-relation :-
1)Graphite: Conductor:: Coal: _______
2) Concave mirror : focusing mirror ::Convex mirror: _______
3)Diamond: ornaments :: Fullerene: ________
4) Convex mirror: outer surface reflecting :: Concave mirror: _____.
5) Dental hospital: Concave mirror :: Mirrors on side of a car: ______
6) Cobalt-60 :Food preservation : : Krypton- 85: _______
7) Propane: single bond :: Propyne : ______
8) Shaving mirror: Concave mirror::
Street lights: ______
3) Define:
i) Principal axis.
ii) Focus
iii) Mirror
iv) Hydrocarbon
Class 9th std
QIA) Choose the correct alternative,
and rewrite the statements :-
1) In which of the following Carbon dioxide is not used ______.
A) Fire
extinguisher
B) Cold storage
C) Ethanol production
2)The mirror whose inner surface is reflecting surface
is called _______
A)Plane B) Concave C)Convex
3) _______mirror is used in a periscope .
A) Convex
B) Plane
C) Concave
4) _________ is the crystalline form of Carbon .
A)Graphite B) Coal
C) Charcoal
5)The centre of the mirror surface is called its____.
A)pole B) radius C) focus
6) ….. is the essential element in all the organic compounds.
A)Carbon,B)Oxygen C) Nitrogen
7) The focal length of a concave mirror is______.
A)Positive B) Negative C) Neutral
8) Methane gas is also called as _______
A)Marsh gas B) water gas C) producer gas gas.
9) A ray of light parallel to the Principal axis of concave mirror after reflection passes through
_______ of the mirror
A) focus B) pole C) centre of curvature
D) radius
10) A _______ image cannot be obtained on a screen.
A) virtual B) real C) magnified D) inverted
11) _______ gases are formed in a biogas plant .
A) CO ,CH4 B) CH4,CO2 C) CO2,O2
D) N2, S2
12)_________ is the property of oxides of non- metals.
A) Acidic B) Basic C) Neutral D) Amphoteric.
13) _______ is a good conductor of heat and electricity
A) Diamond B) Graphite C) Coal D) Coke
, 14) _____ is used in treatment of hyperthyroidism
A) Iodine – 123 B) Iodine-60 C) Cobalt-60 D) Krypton- 85
15) ______ is used in making braed ,cake, dhokla.
A)Sodium Carbonate B) Sodium bicarbonate C) Calcium Carbonate
D) Magnesium Carbonate.
16) _______ is used in disinfecting drinking water .
A) Copper Sulphate B) Alum
C) Bleaching powder D) Sodium Chloride
17) ________ is used in manufacturing of soap and detergents.
A) Sodium Carbonate B) Calcium Carbonate C) Sodium Carbonate
D)Sodium Nitrate.
Q2B) Attempt the following questions :-
1) Say whether True or false:-
1)The focal length of a Concave mirror is negative.
2) Methane is a highly inflammable gas.
3) Carbon dioxide is used in aerated drinks.
4)The image in front of the mirror which can be obtained on a screen is called a Virtual image.
5)The molecular formula of Carbon dioxide is CO.
6) A concave mirror is a diverging mirror.
7) Charcoal is a porous, therefore it has low density.
8 ) The Dye used in lipstick is carmine.
9) Teflon is a polymer of tetrafluoroethene
2) Complete the co-relation :-
1)Graphite: Conductor:: Coal: _______
2) Concave mirror : focusing mirror ::Convex mirror: _______
3)Diamond: ornaments :: Fullerene: ________
4) Convex mirror: outer surface reflecting :: Concave mirror: _____.
5) Dental hospital: Concave mirror :: Mirrors on side of a car: ______
6) Cobalt-60 :Food preservation : : Krypton- 85: _______
7) Propane: single bond :: Propyne : ______
8) Shaving mirror: Concave mirror::
Street lights: ______
3) Define:
i) Principal axis.
ii) Focus
iii) Mirror
iv) Hydrocarbon
