Major Competitive Exams
Q. Which of the following shapes has the largest moment of inertia for the same mass and radius?
A.
Solid sphere
B.
Hollow sphere
C.
Solid cylinder
D.
Hollow cylinder
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Solution
The hollow sphere has the largest moment of inertia compared to the other shapes for the same mass and radius.
Correct Answer: B — Hollow sphere
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Q. Which of the following shapes is not a polygon?
A.
Pentagon
B.
Hexagon
C.
Circle
D.
Octagon
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Solution
A Circle is not a polygon as it does not have straight edges.
Correct Answer: C — Circle
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Q. Which of the following social changes was a direct result of the French Revolution?
A.
Reinforcement of monarchies across Europe.
B.
Establishment of a classless society.
C.
Promotion of the idea of citizenship and individual rights.
D.
Return to feudal systems.
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Solution
The French Revolution introduced the concepts of citizenship and individual rights, challenging the traditional hierarchies and monarchies of the time.
Correct Answer: C — Promotion of the idea of citizenship and individual rights.
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Q. Which of the following social reformers is associated with the establishment of the 'Arya Samaj' that aimed at social reform and justice?
A.
Raja Ram Mohan Roy
B.
Swami Vivekananda
C.
Dayananda Saraswati
D.
Gopal Krishna Gokhale
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Solution
Dayananda Saraswati founded the Arya Samaj in 1875, which aimed at social reform, including the promotion of education and the eradication of caste discrimination.
Correct Answer: C — Dayananda Saraswati
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Q. Which of the following solids has a high degree of anisotropy? (2019)
A.
Ionic solids
B.
Covalent solids
C.
Metallic solids
D.
Molecular solids
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Solution
Covalent solids exhibit a high degree of anisotropy due to their directional bonding.
Correct Answer: B — Covalent solids
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Q. Which of the following solids has a high thermal conductivity? (2019)
A.
Ionic solids
B.
Covalent solids
C.
Metallic solids
D.
Molecular solids
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Solution
Metallic solids have high thermal conductivity due to the presence of free-moving electrons.
Correct Answer: C — Metallic solids
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Q. Which of the following solutions has the highest boiling point?
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M CaCl2
D.
0.1 M glucose
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Solution
CaCl2 dissociates into 3 ions (Ca^2+ and 2 Cl^-), leading to the highest boiling point elevation among the options.
Correct Answer: C — 0.1 M CaCl2
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Q. Which of the following solutions has the highest concentration?
A.
0.1 M NaCl
B.
0.2 M KCl
C.
0.05 M CaCl2
D.
0.3 M MgSO4
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Solution
Concentration in terms of molarity: 0.1 M NaCl = 0.1, 0.2 M KCl = 0.2, 0.05 M CaCl2 = 0.15 (0.05*3), 0.3 M MgSO4 = 0.3. Highest is 0.3 M MgSO4.
Correct Answer: D — 0.3 M MgSO4
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Q. Which of the following solutions has the highest freezing point? (2020)
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M glucose
D.
0.1 M CaCl2
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Solution
0.1 M glucose is a non-electrolyte and does not dissociate, thus it has the highest freezing point compared to the ionic solutions.
Correct Answer: C — 0.1 M glucose
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Q. Which of the following solutions will have the highest boiling point?
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M glucose
D.
0.1 M MgCl2
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Solution
0.1 M MgCl2 will have the highest boiling point due to the highest van 't Hoff factor (i = 3).
Correct Answer: D — 0.1 M MgCl2
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Q. Which of the following solutions will have the lowest freezing point?
A.
0.1 M NaCl
B.
0.1 M KBr
C.
0.1 M MgCl2
D.
0.1 M glucose
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Solution
MgCl2 dissociates into 3 ions, leading to the greatest freezing point depression among the options.
Correct Answer: C — 0.1 M MgCl2
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Q. Which of the following solutions will have the lowest vapor pressure?
A.
0.1 M NaCl
B.
0.1 M KBr
C.
0.1 M MgCl2
D.
0.1 M glucose
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Solution
MgCl2 dissociates into 3 ions, leading to the highest number of solute particles and thus the lowest vapor pressure.
Correct Answer: C — 0.1 M MgCl2
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Q. Which of the following species acts as a reducing agent in the reaction 2Fe2O3 + 3C → 4Fe + 3CO2? (2020)
A.
Fe2O3
B.
C
C.
Fe
D.
CO2
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Solution
Carbon (C) acts as a reducing agent as it donates electrons to reduce Fe2O3 to Fe.
Correct Answer: B — C
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Q. Which of the following species acts as a reducing agent in the reaction 2Fe2O3 + 3C → 4Fe + 3CO? (2022)
A.
Fe2O3
B.
C
C.
Fe
D.
CO
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Solution
Carbon (C) acts as a reducing agent as it donates electrons to reduce Fe2O3 to Fe.
Correct Answer: B — C
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Q. Which of the following species exhibits sp3d hybridization?
A.
SF4
B.
XeF2
C.
NH3
D.
C2H4
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Solution
In SF4, the sulfur atom is sp3d hybridized, resulting in a seesaw molecular geometry.
Correct Answer: A — SF4
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Q. Which of the following species has a bond order of 1?
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Solution
F2 has a bond order of 1, calculated as (8 bonding electrons - 6 antibonding electrons)/2 = 1.
Correct Answer: C — F2
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Q. Which of the following species has a central atom with sp3 hybridization?
A.
CCl4
B.
CO2
C.
BF3
D.
H2O
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Solution
In CCl4, the central carbon atom is sp3 hybridized, forming a tetrahedral geometry.
Correct Answer: A — CCl4
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Q. Which of the following species has a linear geometry due to hybridization?
A.
H2O
B.
CO2
C.
NH3
D.
CH4
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Solution
CO2 has a linear geometry due to the sp hybridization of the carbon atom.
Correct Answer: B — CO2
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Q. Which of the following species has a linear molecular geometry?
A.
BeCl2
B.
NH3
C.
H2O
D.
CH3Cl
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Solution
BeCl2 has two bonding pairs and no lone pairs, resulting in a linear molecular geometry.
Correct Answer: A — BeCl2
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Q. Which of the following species has a linear molecular shape?
A.
BeCl2
B.
SF6
C.
NH3
D.
H2O
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Solution
BeCl2 has two bonding pairs and no lone pairs, resulting in a linear shape.
Correct Answer: A — BeCl2
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Q. Which of the following species has a tetrahedral shape?
A.
CH4
B.
C2H4
C.
NH3
D.
H2O
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Solution
CH4 has a tetrahedral shape due to sp3 hybridization of the carbon atom.
Correct Answer: A — CH4
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Q. Which of the following species has a trigonal bipyramidal geometry?
A.
PCl5
B.
BF3
C.
H2O
D.
NH4+
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Solution
PCl5 has five bonding pairs and no lone pairs, resulting in a trigonal bipyramidal geometry.
Correct Answer: A — PCl5
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Q. Which of the following species has sp2 hybridization?
A.
C2H2
B.
BF3
C.
C2H4
D.
CH4
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Solution
C2H4 (ethylene) has a carbon-carbon double bond, and each carbon is sp2 hybridized.
Correct Answer: C — C2H4
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Q. Which of the following species has the highest bond order?
A.
O2+
B.
O2
C.
O2-
D.
O2 2-
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Solution
O2+ has a bond order of 2.5, which is higher than O2 (2), O2- (1.5), and O2 2- (1).
Correct Answer: A — O2+
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Q. Which of the following species is reduced in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O?
A.
MnO4-
B.
C2O4^2-
C.
H+
D.
CO2
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Solution
In the given reaction, MnO4- is reduced to Mn^2+.
Correct Answer: A — MnO4-
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Q. Which of the following species is the strongest oxidizing agent? (2023)
A.
F2
B.
Cl2
C.
Br2
D.
I2
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Solution
F2 is the strongest oxidizing agent among the halogens due to its high electronegativity and ability to gain electrons.
Correct Answer: A — F2
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Q. Which of the following statements about 'probability' is true?
A.
Probability can only be calculated for discrete events.
B.
The sum of probabilities of all possible outcomes is always 1.
C.
Probability is independent of the sample space.
D.
Probability can never exceed 1.
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Solution
The sum of probabilities of all possible outcomes must equal 1, which is a fundamental principle in probability theory.
Correct Answer: B — The sum of probabilities of all possible outcomes is always 1.
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Q. Which of the following statements about a convex lens is true?
A.
It can only produce real images.
B.
It can only produce virtual images.
C.
It can produce both real and virtual images.
D.
It has a negative focal length.
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Solution
A convex lens can produce both real images (when the object is outside the focal length) and virtual images (when the object is within the focal length).
Correct Answer: C — It can produce both real and virtual images.
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Q. Which of the following statements about a parallelogram is true? (2023)
A.
All sides are equal.
B.
Diagonals bisect each other.
C.
All angles are right angles.
D.
It has exactly one pair of parallel sides.
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Solution
In a parallelogram, the diagonals bisect each other, which is a defining property of parallelograms.
Correct Answer: B — Diagonals bisect each other.
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Q. Which of the following statements about a potentiometer is true?
A.
It can only measure AC voltages.
B.
It requires a constant current for accurate measurements.
C.
It can measure both AC and DC voltages.
D.
It is only used in laboratory settings.
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Solution
A potentiometer requires a constant current to ensure accurate measurements of voltage.
Correct Answer: B — It requires a constant current for accurate measurements.
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