Undergraduate
Q. In which of the following organisms does binary fission occur? (2019)
A.
Yeast
B.
Amoeba
C.
Hydra
D.
Starfish
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Solution
Binary fission is a form of asexual reproduction commonly seen in unicellular organisms like Amoeba.
Correct Answer: B — Amoeba
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Q. In which of the following organisms does external fertilization occur? (2021)
A.
Frog
B.
Human
C.
Dog
D.
Cat
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Solution
Frogs exhibit external fertilization where eggs and sperm are released into the water.
Correct Answer: A — Frog
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Q. In which of the following processes is adsorption utilized? (2023)
A.
Water purification
B.
Sublimation
C.
Distillation
D.
Filtration
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Solution
Adsorption is widely used in water purification processes to remove impurities.
Correct Answer: A — Water purification
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Q. In which of the following processes is the enthalpy change (ΔH) equal to the heat absorbed at constant pressure? (2019)
A.
Isothermal process
B.
Isochoric process
C.
Isobaric process
D.
Adiabatic process
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Solution
In an isobaric process, the enthalpy change (ΔH) is equal to the heat absorbed or released at constant pressure.
Correct Answer: C — Isobaric process
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Q. In which part of the plant does respiration primarily occur? (2020)
A.
Roots
B.
Leaves
C.
Stems
D.
All parts
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Solution
Respiration occurs in all parts of the plant, including roots, leaves, and stems.
Correct Answer: D — All parts
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Q. In which phase do sister chromatids separate and move to opposite poles? (2019)
A.
Prophase
B.
Metaphase
C.
Anaphase
D.
Telophase
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Solution
During Anaphase, sister chromatids are pulled apart and move toward opposite poles of the cell.
Correct Answer: C — Anaphase
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Q. In which phase of the cell cycle does the cell spend the majority of its life? (2021)
A.
M phase
B.
G1 phase
C.
S phase
D.
G2 phase
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Solution
The G1 phase is where the cell spends most of its life, performing normal functions and growing.
Correct Answer: B — G1 phase
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Q. In which state of matter do particles have the least amount of energy?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Particles in a solid have the least amount of energy compared to liquids, gases, and plasma.
Correct Answer: A — Solid
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Q. In which state of matter do particles move freely and are far apart? (2021)
A.
Solid
B.
Liquid
C.
Gas
D.
None of the above
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Solution
In gases, particles move freely and are far apart compared to solids and liquids.
Correct Answer: C — Gas
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Q. Iron is essential for which of the following functions in plants? (2022)
A.
Chlorophyll synthesis
B.
Water uptake
C.
Nutrient transport
D.
Cell elongation
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Solution
Iron is crucial for chlorophyll synthesis and is involved in various enzymatic reactions in plants.
Correct Answer: A — Chlorophyll synthesis
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Q. Solve the differential equation dy/dx = 2x + 1.
A.
y = x^2 + x + C
B.
y = x^2 + 2x + C
C.
y = 2x^2 + x + C
D.
y = x^2 + C
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Solution
Integrating both sides, we get y = ∫(2x + 1)dx = x^2 + x + C.
Correct Answer: A — y = x^2 + x + C
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Q. Solve the differential equation dy/dx = 2y + 3. (2023)
A.
y = Ce^(2x) - 3/2
B.
y = Ce^(-2x) + 3/2
C.
y = 3e^(2x)
D.
y = 2e^(2x) + C
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Solution
Using an integrating factor, we find the solution is y = Ce^(2x) - 3/2.
Correct Answer: A — y = Ce^(2x) - 3/2
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Q. Solve the differential equation dy/dx = y/x. (2023)
A.
y = Cx
B.
y = Cx^2
C.
y = C/x
D.
y = C ln(x)
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Solution
This is a separable equation. Integrating gives y = Cx.
Correct Answer: A — y = Cx
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Q. Solve the differential equation y' = 5 - 2y.
A.
y = 5/2 + Ce^(-2x)
B.
y = 5 + Ce^(-2x)
C.
y = 2 + Ce^(2x)
D.
y = 5/2 - Ce^(-2x)
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Solution
This is a linear first-order equation. The solution is y = 5/2 + Ce^(-2x).
Correct Answer: A — y = 5/2 + Ce^(-2x)
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Q. Solve the differential equation y'' - 3y' + 2y = 0.
A.
y = C1e^(2x) + C2e^(x)
B.
y = C1e^(x) + C2e^(2x)
C.
y = C1e^(-x) + C2e^(-2x)
D.
y = C1e^(3x) + C2e^(x)
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Solution
The characteristic equation is r^2 - 3r + 2 = 0, which factors to (r - 1)(r - 2) = 0. The general solution is y = C1e^(x) + C2e^(2x).
Correct Answer: B — y = C1e^(x) + C2e^(2x)
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Q. Solve the first-order differential equation dy/dx = y/x.
A.
y = Cx
B.
y = Cx^2
C.
y = C/x
D.
y = C ln(x)
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Solution
This is a separable equation. Separating variables and integrating gives y = Cx.
Correct Answer: A — y = Cx
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Q. Solve the first-order linear differential equation dy/dx + y/x = 1.
A.
y = x + C/x
B.
y = Cx - x
C.
y = Cx + x
D.
y = C/x + x
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Solution
Using the integrating factor e^(∫(1/x)dx) = x, we solve to get y = x + C/x.
Correct Answer: A — y = x + C/x
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Q. The Arrhenius equation relates which of the following? (2023)
A.
Rate constant and temperature
B.
Concentration and time
C.
Pressure and volume
D.
Energy and temperature
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Solution
The Arrhenius equation relates the rate constant (k) to temperature (T) and activation energy (Ea).
Correct Answer: A — Rate constant and temperature
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Q. The concept of 'survival of the fittest' is best associated with which of the following?
A.
Lamarckism
B.
Darwinism
C.
Mendelian Genetics
D.
Modern Synthesis
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Solution
'Survival of the fittest' is a phrase often associated with Darwinism, which emphasizes the role of natural selection in evolution.
Correct Answer: B — Darwinism
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Q. The concept of absolute zero is defined as the temperature at which: (2020)
A.
Molecular motion ceases
B.
Pressure is zero
C.
Volume is zero
D.
Density is maximum
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Solution
Absolute zero is defined as the temperature at which molecular motion ceases, corresponding to 0 Kelvin.
Correct Answer: A — Molecular motion ceases
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Q. The critical angle for total internal reflection occurs when light travels from: (2019)
A.
Air to water
B.
Water to air
C.
Glass to air
D.
Air to glass
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Solution
The critical angle occurs when light travels from a denser medium (water) to a less dense medium (air).
Correct Answer: B — Water to air
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Q. The dimensional formula for frequency is: (2023)
A.
[T^-1]
B.
[M^0 L^0 T^-1]
C.
[M^1 L^1 T^-1]
D.
[M^0 L^1 T^0]
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Solution
Frequency is defined as the number of cycles per unit time, hence its dimensional formula is [T^-1].
Correct Answer: A — [T^-1]
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Q. The efficiency of a Carnot engine depends on: (2022)
A.
The temperature of the hot reservoir only
B.
The temperature of the cold reservoir only
C.
The temperatures of both the hot and cold reservoirs
D.
The type of working substance used
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Solution
The efficiency of a Carnot engine is determined by the temperatures of both the hot and cold reservoirs, given by the formula η = 1 - (T_c/T_h).
Correct Answer: C — The temperatures of both the hot and cold reservoirs
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Q. The five-kingdom classification system was proposed by: (2019)
A.
Linnaeus
B.
Whittaker
C.
Haeckel
D.
Darwin
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Solution
The five-kingdom classification system was proposed by Robert Whittaker.
Correct Answer: B — Whittaker
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Q. The force experienced by a charged particle moving in a magnetic field is maximum when the angle between the velocity and magnetic field is: (2020)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
45 degrees
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Solution
The force (F) on a charged particle in a magnetic field is given by F = qvB sin(θ). The force is maximum when θ = 90 degrees, as sin(90) = 1.
Correct Answer: B — 90 degrees
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Q. The force on a charged particle moving in a magnetic field is maximum when the angle between the velocity and the magnetic field is: (2021)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
45 degrees
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Solution
The force on a charged particle moving in a magnetic field is maximum when the angle between the velocity and the magnetic field is 90 degrees.
Correct Answer: B — 90 degrees
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Q. The frequency of a simple harmonic oscillator is 5 Hz. What is its angular frequency? (2020)
A.
10 rad/s
B.
5 rad/s
C.
15 rad/s
D.
20 rad/s
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Solution
Angular frequency (ω) = 2πf = 2π × 5 = 10 rad/s
Correct Answer: A — 10 rad/s
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Q. The Freundlich adsorption isotherm is best described by which equation? (2023)
A.
x/m = kP
B.
x/m = kP^(1/n)
C.
P = k(x/m)
D.
P = k(x/m)^(1/n)
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Solution
The Freundlich isotherm is represented by the equation x/m = kP^(1/n), where x is the amount adsorbed, m is the mass of the adsorbent, and P is the pressure.
Correct Answer: B — x/m = kP^(1/n)
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Q. The half-life of a first-order reaction is dependent on which of the following? (2020) 2020
A.
Initial concentration of reactants
B.
Rate constant
C.
Temperature
D.
All of the above
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Solution
The half-life of a first-order reaction is independent of the initial concentration and is directly proportional to the rate constant.
Correct Answer: B — Rate constant
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Q. The half-life of a first-order reaction is given by which of the following expressions? (2020)
A.
t1/2 = 0.693/k
B.
t1/2 = k/0.693
C.
t1/2 = 1/k
D.
t1/2 = k/1
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Solution
For a first-order reaction, the half-life is constant and is given by the formula t1/2 = 0.693/k.
Correct Answer: A — t1/2 = 0.693/k
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