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WorksheetsJORHAT CLUSTER CLASS 10 SCIENCE SET 2
Total questions: 15
Worksheet time: 45mins
Name
Class
Date
1.
In the following reaction PbO+C---->Pb+CO which statement is correct?
a)
PbO is oxidised
b)
C acts as oxidising agent
c)
C acts as a reducing agent.
d)
Reaction doesn't represent redox reaction.
2.
In autotrophic mode of nutrition organisms made there own food. In plants they absorb light energy. A green pigment present in leaves essential for absorption of light energy. Leaves are the parts of plants where plant construct there own food. During this process conversion of light energy to chemical energy takes place along splitting of water molecules into hydrogen and oxygen ( the gas which plants exhale during respiration) and reduction of carbon dioxide into carbohydrates. Which gas in photosynthesis process converts into carbohydrates?
a)
Carbon dioxide
b)
Oxygen
c)
Nitrogen
d)
Ozone
3.
In which of the following, the identity of initial substance remains unchanged?
a)
Curdling of milk
b)
Formation of crystals by process of crystallisation
c)
Fermentation of grapes
d)
Digestion of food
4.
Chemistry in Automobiles: For an internal combustion engine to move a vehicle down the road, it must convert the energy stored in the fuel into mechanical energy to drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical "spark", which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustion of gasoline in full supply of air: 2C8H18 +25 O2------> 16 X + Y. which of the following are the products obtained from the reaction mentioned in the above case?
a)
a) X- CO2, Y- H2O2
b)
b) X- H2O, Y- CO
c)
c) X- CH3OH, Y- H2O
d)
d) X- CO2, Y- H2O
5.
Ayush taken a silvery-white metal X in the form of ribbon, which Is when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substance Z. What could metal X be and one day to day life use of compound Z is
a)
Metal X is Mg and compound Z used as Antacid to relieve indigestion
b)
Metal X is Cu and compound Z used as fungicides
c)
Metal X is Ca and compound Z used in white washing
d)
Metal X is Mg and compound Z is used to set fracture bones.
6.
Which of these is a convex mirror?
a)
Shaving mirror
b)
Dentist’s mirror
c)
Headlight mirror of a bike
d)
Rear-view mirror of a car
7.
A mirror magnify the image of an object by minus 1.5 times which of the following is true about the image produced by the mirror.
a)
Image is real, erect and larger than the object
b)
Image is real, inverted and larger than the object
c)
Image is virtual and larger than the object
d)
Image is virtual and smaller than the object
8.
Which of the following is not a physical change?
a)
Dissolution of NaCl in water
b)
Melting of ice to give water
c)
Combustion of Compressed Natural Gas(CNG)
d)
Boiling of water to give water vapour
9.
Take 5 ml of sodium sulphate solution in a test tube and 5 ml of barium chloride solution in another test tube. Mix the two solutions slowly and leave the test tube undisturbed for some time. A white precipitate is formed after some time. Which of the following statement is correct about the above reaction
a)
It is a double displacement reaction since exchange of ions occurs between two reactants.
b)
It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.
c)
It's a displacement reaction since chloride ions are replaced by sulphate ions.
d)
None of these
10.
Which of the following statement is correct regarding the electrolysis of water?
a)
Oxidation takes place at the cathode.
b)
Reduction takes place at the cathode.
c)
Reduction takes place at the anode.
d)
Electrolysis is not a redox reaction.
11.
Which of the following is the correct sequence of body parts in the human alimentary canal?
a)
Mouth → stomach → small intestine → large intestine → oesophagus
b)
Mouth → oesophagus → stomach → small intestine → large intestine
c)
Mouth → stomach → oesophagus → small intestine → large intestine
d)
Mouth → oesophagus → stomach → large intestine → small intestine
12.
Choose the correct coefficients which balance the following chemical equation. C2H4 + O2 -> CO2 + H2O
a)
2,3,4,5
b)
1,2,2,2
c)
1,3,2,2
d)
1,2,5,6
13.
Which of the following statements is true about heart? (i) It is a hollow muscular organ. (ii) It is a four chambered having three atria and one ventricle. (iii) It has different chambers to prevent the oxygen - rich blood from mixing with the blood containing carbon dioxide. (iv) Arteries always carry blood away from the heart.
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i), (ii) and (iii)
d)
(i), (iii) and (iv)
14.
I. Read the given passage and answer the following questions : In an activity to prove the requirements for photosynthesis, two healthy potted plants were kept in the dark for 72 hours. After 72 hours ,KOH is kept in the watch glass in setup X and not in setup Y. Both these setups are air tight and have been kept in the light for 6 hours. Then ,Iodine test is performed with one leaf from each of the two plants X and Y. This experimental setup is used to prove essentiality of which of the following requirements of photosynthesis?
a)
Sunlight
b)
Chlorophyll
c)
Oxygen
d)
Carbon dioxide
15.
Decomposition reaction refers to breakdown of a compound by passing current, heat or exposing it to light. Decomposition reaction refers to the breakdown of compounds into two or more of its constituents. In general, the decomposition reaction can be represented by AB → A + B. Not all decomposition reactions are redox reactions. The opposite of decomposition is synthesis, where a new compound is formed by the reaction of two or more reactants. The decomposition reaction requires energy in the form of heat, electricity or light to break the bonds. Reaction of hydrogen peroxide to give H2O + O2 is an example of
a)
Redox
b)
Decomposition
c)
Both option 1 & option 2
d)
None of the above
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