Q. In electrolysis, if 1 mole of electrons is transferred, how many grams of copper can be deposited from Cu²⁺?
A.
63.5 g
B.
31.75 g
C.
127 g
D.
159 g
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Solution
1 mole of Cu²⁺ deposits 63.5 g of copper.
Correct Answer: A — 63.5 g
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Q. In electrolysis, if the current is 2 A and the time is 30 minutes, how many moles of electrons are transferred?
A.
0.1 mol
B.
0.2 mol
C.
0.3 mol
D.
0.4 mol
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Solution
Using the formula: moles = (current × time) / (n × F), where n=1 for electrons and F=96500 C/mol.
Correct Answer: B — 0.2 mol
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Q. In electrolysis, the process of oxidation occurs at the: (2023)
A.
Anode
B.
Cathode
C.
Electrolyte
D.
None of the above
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Solution
In electrolysis, oxidation occurs at the anode.
Correct Answer: A — Anode
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Q. In electrolysis, the process of oxidation occurs at the: (2023) 2023
A.
Anode
B.
Cathode
C.
Electrolyte
D.
None of the above
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Solution
In electrolysis, oxidation occurs at the anode.
Correct Answer: A — Anode
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Q. In electrolysis, the process of oxidation occurs at which electrode? (2019)
A.
Anode
B.
Cathode
C.
Both electrodes
D.
None of the above
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Solution
In electrolysis, oxidation occurs at the anode.
Correct Answer: A — Anode
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Q. In electrolysis, what is produced at the anode when NaCl solution is electrolyzed? (2022)
A.
Hydrogen gas
B.
Chlorine gas
C.
Sodium metal
D.
Oxygen gas
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Solution
Chlorine gas is produced at the anode during the electrolysis of NaCl solution.
Correct Answer: B — Chlorine gas
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Q. In electromagnetic induction, what is the role of the changing magnetic field?
A.
It creates a static electric field
B.
It induces a current in a conductor
C.
It has no effect
D.
It increases resistance
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Solution
A changing magnetic field induces an electromotive force (EMF) in a conductor, leading to the flow of current.
Correct Answer: B — It induces a current in a conductor
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Q. In electrostatics, what is the significance of equipotential surfaces?
A.
They are surfaces where electric field is zero
B.
They are surfaces where potential is constant
C.
They are surfaces where charge density is uniform
D.
They are surfaces where current flows
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Solution
Equipotential surfaces are defined as surfaces where the electric potential is constant. No work is done when moving a charge along these surfaces.
Correct Answer: B — They are surfaces where potential is constant
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Q. In Excel, what does the VLOOKUP function do? (2023)
A.
Looks up a value vertically
B.
Calculates the average
C.
Counts the number of cells
D.
Finds the maximum value
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Solution
The VLOOKUP function in Excel is used to look up a value vertically in a table.
Correct Answer: A — Looks up a value vertically
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Q. In Excel, which symbol is used to start a formula? (2023)
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Solution
In Excel, the '=' symbol is used to start a formula.
Correct Answer: B — =
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Q. In flowering plants, the male gamete is produced in which part? (2021)
A.
Ovary
B.
Anther
C.
Stigma
D.
Style
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Solution
The male gamete is produced in the anther, which is part of the stamen in flowering plants.
Correct Answer: B — Anther
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Q. In flowering plants, the male gametes are produced in which part? (2022)
A.
Ovary
B.
Stigma
C.
Anther
D.
Style
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Solution
The male gametes are produced in the anther, which is part of the stamen in flowering plants.
Correct Answer: C — Anther
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Q. In flowering plants, the ovary develops into which part after fertilization? (2023)
A.
Seed
B.
Fruit
C.
Flower
D.
Leaf
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Solution
After fertilization, the ovary develops into a fruit, which contains the seeds.
Correct Answer: B — Fruit
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Q. In flowering plants, the ovary develops into which structure after fertilization? (2023)
A.
Seed
B.
Fruit
C.
Flower
D.
Leaf
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Solution
After fertilization, the ovary develops into a fruit, which contains the seeds.
Correct Answer: B — Fruit
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Q. In flowering plants, the process of fusion of male and female gametes is known as? (2019)
A.
Pollination
B.
Fertilization
C.
Germination
D.
Seed dispersal
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Solution
Fertilization is the process where the male gamete (pollen) fuses with the female gamete (ovule) to form a zygote.
Correct Answer: B — Fertilization
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Q. In flowering plants, the process of pollination involves the transfer of pollen from the anther to the: (2021)
A.
Ovary
B.
Style
C.
Stigma
D.
Sepal
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Solution
Pollination is the transfer of pollen from the anther to the stigma of a flower, which is essential for fertilization.
Correct Answer: C — Stigma
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Q. In flowering plants, the process of pollination involves the transfer of pollen from the ____ to the ____. (2019)
A.
Ovary, Stigma
B.
Anther, Stigma
C.
Stigma, Ovary
D.
Filament, Anther
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Solution
Pollination is the transfer of pollen from the anther (male part) to the stigma (female part) of a flower.
Correct Answer: B — Anther, Stigma
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Q. In fluid mechanics, what does the term 'streamline' refer to? (2020)
A.
Path of a fluid particle
B.
Layer of fluid
C.
Viscous flow
D.
Turbulent flow
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Solution
A streamline refers to the path followed by a fluid particle in a steady flow.
Correct Answer: A — Path of a fluid particle
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Q. In forced oscillations, what is the effect of increasing the amplitude of the driving force?
A.
Decreases the amplitude of oscillation
B.
Increases the amplitude of oscillation
C.
Has no effect on amplitude
D.
Causes the system to stop oscillating
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Solution
Increasing the amplitude of the driving force generally increases the amplitude of the forced oscillation.
Correct Answer: B — Increases the amplitude of oscillation
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Q. In forced oscillations, what is the phase difference between the driving force and the displacement at resonance?
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
270 degrees
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Solution
At resonance, the phase difference between the driving force and the displacement is 0 degrees, meaning they are in phase.
Correct Answer: A — 0 degrees
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Q. In heat exchangers, which process is primarily utilized?
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
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Solution
Heat exchangers primarily utilize conduction, convection, and radiation for heat transfer.
Correct Answer: D — All of the above
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Q. In heat transfer, what does the term 'thermal resistance' refer to?
A.
Resistance to heat flow
B.
Resistance to electrical flow
C.
Resistance to fluid flow
D.
None of the above
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Solution
Thermal resistance refers to the resistance to heat flow through a material.
Correct Answer: A — Resistance to heat flow
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Q. In her latest book, the scientist emphasizes the importance of interdisciplinary approaches, suggesting that true innovation often occurs at the ______ of different fields.
A.
intersection
B.
periphery
C.
foundation
D.
exclusion
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Solution
The term 'intersection' implies a meeting point of different fields, which aligns with the idea of interdisciplinary approaches.
Correct Answer: A — intersection
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Q. In how many different ways can the letters of the word 'MATH' be arranged?
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Solution
The word 'MATH' has 4 distinct letters. The number of arrangements is 4! = 24.
Correct Answer: B — 24
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Q. In how many ways can 3 boys and 2 girls be seated in a row?
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Solution
The total number of arrangements is (3+2)! = 5! = 120.
Correct Answer: B — 60
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Q. In how many ways can 3 different colored balls be arranged in a line?
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Solution
The number of arrangements of 3 different colored balls is 3! = 6.
Correct Answer: A — 6
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Q. In how many ways can 3 different colored balls be arranged in a row? (2015)
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Solution
The number of arrangements of 3 different colored balls is 3! = 6.
Correct Answer: A — 6
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Q. In how many ways can 3 different colored balls be chosen from a set of 7?
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Solution
The number of ways to choose 3 from 7 is given by C(7,3) = 7!/(3!4!) = 35.
Correct Answer: A — 35
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Q. In how many ways can 3 different fruits be selected from a basket of 7 fruits? (2014)
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Solution
The number of ways to select 3 from 7 is C(7, 3) = 35.
Correct Answer: A — 35
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Q. In how many ways can 3 different letters be chosen from the word 'COMPUTE'? (2019)
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Solution
The number of ways to choose 3 letters from 8 is C(8, 3) = 56.
Correct Answer: C — 70
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