MCQs
Chapter 1
Q.No.1 Why should be Mg ribbon be cleaned before burning in air
a. as Mg catched fire immediately
b. as Mg forms layer of hydrogen
c. as Mg forms layer of Carbon
d. as Mg forms layer of oxygen
Ans. d. as Mg forms layer of oxygen
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Q.No.2 Balance the equation Hydrogen + Chlorine = Hydrogen Chloride
a. H2+ Cl2 = 2HCl
b.H3+Cl3 = 3 HCl
c. H + Cl = HCl
d. None
Ans. a. H2 + Cl2 = 2HCl
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Q.No.3 Balance the equation : Barium Chloride + Aluminium Sulphate = Barium Sulphate + Aluminium Chloride
a. Ba3Cl2 + Al4(SO2)4 = 5BaSO6 + 4Al2Cl3
b. Ba3Cl2 + Al2(SO4)3 = 3BaSO4 + 2AlCl3
c. Ba3Cl2 + Al2(SO4)3 = 8BaSO4 + 6AlCl3
d. BaCl2 + Al2(SO4)3 = 3BaSO4 + 2AlCl3
Ans.d. BaCl2 + Al2(SO4)3 = 3BaSO4 + 2AlCl3
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Q.No.4 Balance the equation : Sodium + Water = Sodium Hydroxide + Hydrogen
a. Na + H20 = NaOH + H2
b. 2Na + 2H20 = 2NaOH + H2
c. 2Na + 2H20 = 2Na2OH + H3
d. 3Na + 4H20 = 2Na2OH + 2H2
Ans. b. 2Na + 2H2O = 2NaOH + H2
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Q.No.5. A solution for white washing
a. Calcium Carbonate CaCO3
b. Calcium hydrogen carbonate
c. Calcium chloride
d. Calcium oxide CaO
Ans. d. Calcium oxide CaO
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Q.No.6. Quick lime
a. Calcium Carbonate CaCO3
b. Calcium hydrogen carbonate
c. Calcium oxide CaO
d. Calcium chloride
Ans. c. Calcium Oxide CaO
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Q.No.7 Slaked lime
a. Calcium Carbonate CaCO3
b. Calcium Hydroxide
c. Calcium oxide CaO
d. Calcium chloride
Ans. b. Calcium hydroxide Ca(OH)2
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Q.No.8 After electrolysis of water, hydrogen gas is collected over
a. cathode
b. anode
c. both
d. none
Ans. a. cathode
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Q.No.9 Slaked lime takes which gas from atmosphere to turn to milky
a. Oxygen
b. Carbon dioxide
c. Argon
d. Helium
Ans. b. Carbon dioxide CO2
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Q.No.10 which colour is formed when Iron is dipped in copper sulphate solution
a. Blue
b. Green
c. Red
d. No colour change
Ans. b. Green
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Q.No.11 Why does colour of copper sulphate changes when iron nail is dipped in it.
a. Copper displaces Iron from its solution
b. Iron displaces copper from its solution
c. A mixed solution of Iron and copper is formed
d. none
Ans. b. Iron displaces copper from its solution
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Q.No.12 Example of double displacement reaction
a. Hydrogen + Chlorine = Hydrogen Chloride
b. Hydrogen + Oxygen = Water
c. Sodium Carbonate + Calcium Chloride = Calcium Carbonate + Sodium Chloride
d. None
Ans. c. Sodium Carbonate + Calcium Chloride = Calcium Carbonate + Sodium Chloride
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Q.No.13 Balance : Sodium Carbonate + Calcium Chloride = Calcium Carbonate + Sodium Chloride
a. 2Na2CO3 + CaCl2 = CaCO3 + 2NaCl
b. Na2CO3 + CaCl2 = CaCO3 + 2NaCl
c. Na2CO3 + 3CaCl2 = CaCO3 + 2NaCl
d. Na2CO3 + 2CaCl2 = CaCO3 + 2NaCl
Ans. b. Na2CO3 + CaCl2 = CaCO3 + 2NaCl
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Q.No.14 Identify which is oxides and reduced in the reaction : 4Na(s) + O2(g) = 2Na2O
a. Sodium is reduced and Oxygen is oxidised
b. Sodium is oxidised and Oxygen is reduced
c. Both are oxidised
d. Both are reduced
Ans. b.Sodium is oxidised and Oxygen is reduced.
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Q.No. 15 correct sequence : i - formation of slaked lime, ii - addition of water, iii - quick lime, iv - absorption of carbon dioxide from atmosphere
a. i ii iii iv
b. iii - ii - i - iv
c. i - iv - iii - ii
d. iv - iii - ii - i
Ans. b. iii - ii - i - iv
Chapter 10 - Light
Q.No.1 According to law of reflection: incident angle is equal to
a. reflected angle b. normal c. 120 degree d.None
Ans.a. reflected angle
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Q.No.2 Which lie in the same plane
a.incident ray b.reflected ray c.plane d.all
Ans.d.all
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Q.No.3 Image formed by the plane mirror is always
a.real and inverted
b.real and erect
c.virtual and inverted
d.virtual and erect
Ans. d.virtual and erect
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Q.No.4 Image formed by the plane mirror is
a.laterally inverted b.laterally erect c.both laterally inverted and erect d.None
Ans.a. laterally inverted
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Q.No.5 If reflecting surface is curved inward then the mirror is
a.convex b.concave c.both convex and concave d.none
Ans.b.concave
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Q.No.6 If reflecting surface is curved outward then the mirror is
a.convex b.concave c.both convex and concave d.none
Ans.a.Convex
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Q.No.7 Centre of the reflecting surface of a spherical mirror is a point called
a.centre of curvature b.pole c.principal axis d.focus
Ans.b. pole
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Q.No.8 Pole lies on the
a.outside of surface of mirror b.inside the surface of the mirror c.on the surface of the mirror d.none
Ans.c.on the surface of the mirror
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Q.No.9 Centre of the curvature is
a.part of the mirror b.not a part of the mirror c.changes with position d.none
Ans.b. not a part of the mirror.
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Q.No.10 Centre of curvature lies which side of the concave mirror
a.behind b.outside c.on the surface d.front
Ans.d.front
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Q.No.11 Centre of curvature lies which side of the convex mirror
a.Behind b.outside c.on the surface d.front
Ans.a.behind
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Q.No.12 Imaginary line between which is known as principal axis
a.Pole and Centre of Curvature b.Pole and Principal Focus c.infinity and focu d.infinity and centre of curvature
Ans.a.pole and centre of curvature
Q13 Which of the following can make a parallel beam of light when light from a point source is incident on it?
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens
Answer: (a) Concave mirror as well as convex lens
Q14 A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) -30 cm
(b) -20 cm
(c) -40cm
(d) -60 cm
Answer: (b) -20 cm
Q15 Laws of reflection holds true for
a. plane mirror
b. concave mirror
c. convex mirror
d. all reflecting surfaces
Ans. d. all reflecting surfaces
Q16 object placed within the focus of concave mirror then image formed behind the mirror is
a. real
b. inverted
c. virtual and inverted
d. virtual and erect
Ans. d. virtual and erect.
Q17. virtual images
i. cannot be projected on the screen
ii. are formed both by concave and convex lens
iii. are always erect
iv. are always inverted
a. i and iv
b. i and ii
c. i, ii and iii
d. i, ii and iv
Ans.