Q. What is the principle behind the working of a transformer?
A.
Conservation of energy
B.
Electromagnetic induction
C.
Thermal expansion
D.
Mechanical advantage
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Solution
Transformers work on the principle of electromagnetic induction, where a changing magnetic field induces an electromotive force (EMF) in a coil.
Correct Answer: B — Electromagnetic induction
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Q. What is the principle behind the working of an electric generator?
A.
Electromagnetic induction
B.
Electrolysis
C.
Thermal expansion
D.
Photoelectric effect
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Solution
An electric generator works on the principle of electromagnetic induction, where mechanical energy is converted into electrical energy by moving a conductor through a magnetic field.
Correct Answer: A — Electromagnetic induction
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Q. What is the principle behind the working of an electric motor?
A.
Electromagnetic induction
B.
Lorentz force
C.
Magnetic resonance
D.
Electrolysis
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Solution
An electric motor operates on the principle of the Lorentz force, which states that a current-carrying conductor in a magnetic field experiences a force.
Correct Answer: B — Lorentz force
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Q. What is the principle of a potentiometer?
A.
It measures current in a circuit.
B.
It measures voltage by balancing it against a known voltage.
C.
It measures resistance directly.
D.
It measures power in a circuit.
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Solution
A potentiometer measures voltage by balancing it against a known voltage, allowing for accurate voltage measurements.
Correct Answer: B — It measures voltage by balancing it against a known voltage.
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Q. What is the principle of conservation of momentum?
A.
Energy cannot be created or destroyed
B.
The total momentum of a closed system remains constant
C.
Force equals mass times acceleration
D.
Work done is equal to energy transferred
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Solution
The principle of conservation of momentum states that the total momentum of a closed system remains constant if no external forces act on it.
Correct Answer: B — The total momentum of a closed system remains constant
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Q. What is the principle of superposition in optics?
A.
Light travels in straight lines
B.
Two waves can interfere to form a resultant wave
C.
Light can be polarized
D.
Light can be diffracted
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Solution
The principle of superposition states that when two or more waves overlap, the resultant displacement is the sum of the individual displacements.
Correct Answer: B — Two waves can interfere to form a resultant wave
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Q. What is the principle of superposition in wave motion?
A.
Waves can only travel in one direction
B.
Waves can interfere with each other
C.
Waves cannot pass through each other
D.
Waves always lose energy
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Solution
The principle of superposition states that when two or more waves overlap, the resultant displacement is the sum of the individual displacements.
Correct Answer: B — Waves can interfere with each other
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Q. What is the principle of superposition in wave theory?
A.
Waves can only interfere constructively
B.
Waves can only interfere destructively
C.
The resultant wave is the sum of individual waves
D.
Waves do not interact with each other
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Solution
The principle of superposition states that when two or more waves overlap, the resultant wave is the sum of the individual waves.
Correct Answer: C — The resultant wave is the sum of individual waves
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Q. What is the probability of drawing a red card from a standard deck of cards?
A.
1/2
B.
1/4
C.
1/3
D.
1/6
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Solution
There are 26 red cards in a deck of 52. Probability = 26/52 = 1/2.
Correct Answer: A — 1/2
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Q. What is the probability of drawing an ace from a standard deck of cards?
A.
1/52
B.
1/13
C.
1/26
D.
1/4
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Solution
There are 4 aces in a deck of 52 cards. Therefore, the probability P(ace) = 4/52 = 1/13.
Correct Answer: B — 1/13
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Q. What is the probability of getting a sum of 7 when two dice are rolled?
A.
1/6
B.
1/12
C.
1/36
D.
1/3
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Solution
The possible outcomes for a sum of 7 are (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) which gives us 6 favorable outcomes. Total outcomes when rolling two dice = 6 * 6 = 36. Therefore, P(sum of 7) = 6/36 = 1/6.
Correct Answer: A — 1/6
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Q. What is the probability of rolling an even number on a fair six-sided die?
A.
1/6
B.
1/3
C.
1/2
D.
2/3
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Solution
Even numbers on a die: 2, 4, 6. Probability = 3/6 = 1/2.
Correct Answer: C — 1/2
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Q. What is the probability of rolling an even number on a single die?
A.
1/2
B.
1/3
C.
1/6
D.
2/3
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Solution
Even numbers on a die = 2, 4, 6. Probability = 3/6 = 1/2.
Correct Answer: A — 1/2
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Q. What is the probability of rolling an even number on a single six-sided die?
A.
1/2
B.
1/3
C.
1/6
D.
2/3
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Solution
The even numbers on a die are 2, 4, and 6. There are 3 even numbers out of 6 total numbers, so the probability is 3/6 = 1/2.
Correct Answer: A — 1/2
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Q. What is the probability of selecting a vowel from the English alphabet?
A.
1/5
B.
1/10
C.
1/26
D.
1/13
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Solution
There are 5 vowels (A, E, I, O, U) in the English alphabet of 26 letters. Therefore, P(vowel) = 5/26.
Correct Answer: A — 1/5
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Q. What is the process called when a heavy nucleus splits into two lighter nuclei?
A.
Nuclear fusion
B.
Nuclear fission
C.
Radioactive decay
D.
Nuclear transmutation
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Solution
Nuclear fission is the process in which a heavy nucleus splits into two lighter nuclei, releasing energy in the process.
Correct Answer: B — Nuclear fission
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Q. What is the process called when a polymer is formed by the addition of monomers without the loss of any small molecules?
A.
Condensation polymerization
B.
Addition polymerization
C.
Cross-linking
D.
Chain termination
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Solution
Addition polymerization is the process where monomers add together without the loss of small molecules.
Correct Answer: B — Addition polymerization
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Q. What is the process called when a polymer is formed by the elimination of a small molecule?
A.
Addition polymerization
B.
Condensation polymerization
C.
Chain-growth polymerization
D.
Step-growth polymerization
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Solution
Condensation polymerization is the process where a polymer is formed by the elimination of a small molecule.
Correct Answer: B — Condensation polymerization
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Q. What is the process called when a solid changes directly into a gas?
A.
Sublimation
B.
Evaporation
C.
Condensation
D.
Deposition
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Solution
Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.
Correct Answer: A — Sublimation
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Q. What is the process of creating a polymer from monomers called?
A.
Polymerization
B.
Depolymerization
C.
Sublimation
D.
Condensation
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Solution
The process of creating a polymer from monomers is called polymerization.
Correct Answer: A — Polymerization
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Q. What is the product formed when Fe2O3 is reduced by carbon monoxide?
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Solution
The product formed is Fe (iron) when Fe2O3 is reduced by carbon monoxide.
Correct Answer: A — Fe
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Q. What is the product of (1 + i) and (1 - i)?
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Solution
(1 + i)(1 - i) = 1 - i^2 = 1 - (-1) = 2.
Correct Answer: A — 2
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Q. What is the product of 3.00 and 2.5, considering significant figures?
A.
7.5
B.
7.50
C.
7.500
D.
7.55
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Solution
In multiplication, the result should have the same number of significant figures as the factor with the least significant figures. 3.00 has 3 significant figures and 2.5 has 2 significant figures, so the result should have 2 significant figures: 7.5.
Correct Answer: A — 7.5
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Q. What is the product of the complete combustion of an alkane?
A.
Carbon monoxide and water
B.
Carbon dioxide and water
C.
Carbon and hydrogen
D.
Hydrogen gas
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Solution
The complete combustion of an alkane produces carbon dioxide and water.
Correct Answer: B — Carbon dioxide and water
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Q. What is the product of the complete combustion of an alkyne?
A.
CO2 and H2O
B.
CO and H2O
C.
C and H2O
D.
C2H4
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Solution
The complete combustion of an alkyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the complete combustion of propane (C3H8)?
A.
CO2 and H2O
B.
CO and H2O
C.
C and H2O
D.
C2H4 and H2O
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Solution
The complete combustion of propane produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the complete hydrogenation of 2-butyne?
A.
1-butyne
B.
2-butyne
C.
butane
D.
butyne
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Solution
The complete hydrogenation of 2-butyne results in butane.
Correct Answer: C — butane
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Q. What is the product of the complex numbers (1 + i) and (1 - i)?
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Solution
(1 + i)(1 - i) = 1^2 - i^2 = 1 - (-1) = 2.
Correct Answer: A — 2
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Q. What is the product of the complex numbers z1 = 1 + i and z2 = 1 - i?
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Solution
z1 * z2 = (1 + i)(1 - i) = 1 - i^2 = 1 + 1 = 2.
Correct Answer: A — 2
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Q. What is the product of the decarboxylation of sodium acetate?
A.
Methane
B.
Ethane
C.
Carbon dioxide
D.
Acetic acid
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Solution
Decarboxylation of sodium acetate produces methane.
Correct Answer: A — Methane
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