Q. What is the continuity equation in fluid dynamics? (2022)
A.
A1V1 = A2V2
B.
P1V1 = P2V2
C.
F = ma
D.
V = IR
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Solution
The continuity equation states that the product of the cross-sectional area (A) and the velocity (V) of a fluid remains constant along a streamline.
Correct Answer: A — A1V1 = A2V2
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Q. What is the coordination number of atoms in a face-centered cubic (FCC) lattice? (2021)
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Solution
In a face-centered cubic (FCC) lattice, each atom is surrounded by 6 other atoms, giving it a coordination number of 6.
Correct Answer: B — 6
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Q. What is the coordination number of atoms in a face-centered cubic (FCC) structure? (2021)
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Solution
In a face-centered cubic (FCC) structure, each atom is in contact with 12 other atoms, giving it a coordination number of 12.
Correct Answer: D — 12
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Q. What is the coordination number of the central metal ion in the complex ion [Co(NH3)6]3+? (2021)
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Solution
In the complex [Co(NH3)6]3+, there are six ammonia (NH3) ligands coordinated to the cobalt ion, giving it a coordination number of 6.
Correct Answer: C — 6
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Q. What is the critical angle for a medium with a refractive index of 1.5? (2019)
A.
30 degrees
B.
45 degrees
C.
60 degrees
D.
90 degrees
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Solution
The critical angle θc can be calculated using sin(θc) = 1/n. Thus, θc = sin^(-1)(1/1.5) = sin^(-1)(0.6667) ≈ 41.81 degrees, which is closest to 60 degrees.
Correct Answer: C — 60 degrees
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Q. What is the current flowing through a 10Ω resistor connected to a 20V battery? (2021)
A.
1 A
B.
2 A
C.
3 A
D.
4 A
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Solution
Using Ohm's law, I = V/R = 20V/10Ω = 2 A.
Correct Answer: B — 2 A
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Q. What is the dielectric constant of a vacuum? (2023)
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Solution
The dielectric constant (κ) of a vacuum is defined as 1, which serves as the reference for other materials.
Correct Answer: A — 1
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Q. What is the dimension of energy? (2020)
A.
M^1L^2T^-2
B.
M^1L^1T^-1
C.
M^0L^2T^-2
D.
M^1L^0T^-1
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Solution
The dimension of energy is M^1L^2T^-2.
Correct Answer: A — M^1L^2T^-2
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Q. What is the dimension of force? (2019)
A.
M^1L^1T^-2
B.
M^1L^2T^-2
C.
M^1L^0T^-2
D.
M^0L^1T^-1
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Solution
The dimension of force is M^1L^1T^-2.
Correct Answer: A — M^1L^1T^-2
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Q. What is the dimension of velocity? (2022)
A.
M^1L^1T^-1
B.
M^0L^1T^-1
C.
M^1L^0T^-1
D.
M^1L^1T^0
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Solution
Velocity is defined as displacement per unit time, hence its dimension is M^0L^1T^-1.
Correct Answer: B — M^0L^1T^-1
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Q. What is the dimension of work? (2022)
A.
M^1L^2T^-2
B.
M^1L^1T^-2
C.
M^0L^2T^-2
D.
M^1L^0T^-1
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Solution
The dimension of work is M^1L^2T^-2.
Correct Answer: A — M^1L^2T^-2
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Q. What is the dimensional formula for force? (2022)
A.
[M^1 L^1 T^-2]
B.
[M^1 L^0 T^-2]
C.
[M^0 L^1 T^-1]
D.
[M^1 L^2 T^0]
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Solution
Force has the dimensional formula [M^1 L^1 T^-2].
Correct Answer: A — [M^1 L^1 T^-2]
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Q. What is the direction of conventional current? (2021)
A.
From negative to positive
B.
From positive to negative
C.
Random direction
D.
Depends on the circuit
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Solution
Conventional current is defined as the flow of positive charge, which is from positive to negative.
Correct Answer: B — From positive to negative
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Q. What is the direction of the magnetic field due to a current flowing in a circular loop when viewed from above? (2023)
A.
Out of the plane
B.
Into the plane
C.
Clockwise
D.
Counterclockwise
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Solution
Using the right-hand rule, if the current flows in a counterclockwise direction when viewed from above, the magnetic field direction is out of the plane.
Correct Answer: A — Out of the plane
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Q. What is the direction of the magnetic field inside a current-carrying circular loop? (2019)
A.
Out of the plane
B.
Into the plane
C.
Clockwise
D.
Counterclockwise
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Solution
Using the right-hand rule, if the current flows in a counterclockwise direction, the magnetic field inside the loop points out of the plane.
Correct Answer: A — Out of the plane
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Q. What is the direction of the magnetic field inside a current-carrying solenoid? (2019)
A.
From south to north
B.
From north to south
C.
Perpendicular to the axis
D.
Radially outward
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Solution
The magnetic field inside a current-carrying solenoid is directed from the north pole to the south pole of the solenoid.
Correct Answer: B — From north to south
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Q. What is the direction of the magnetic field produced by a current-carrying wire when viewed from one end? (2023)
A.
Always towards the wire
B.
Always away from the wire
C.
Depends on the direction of current
D.
Always perpendicular to the wire
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Solution
The direction of the magnetic field produced by a current-carrying wire depends on the direction of the current, as determined by the right-hand rule.
Correct Answer: C — Depends on the direction of current
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Q. What is the effect of a catalyst on a chemical reaction? (2019)
A.
Increases activation energy
B.
Decreases activation energy
C.
Changes the equilibrium constant
D.
Has no effect on the reaction rate
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Solution
A catalyst lowers the activation energy of a reaction, thereby increasing the reaction rate.
Correct Answer: B — Decreases activation energy
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Q. What is the effect of adding a non-volatile solute to a solvent on its boiling point? (2019)
A.
Increases boiling point
B.
Decreases boiling point
C.
No effect
D.
Depends on the solute
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Solution
Adding a non-volatile solute increases the boiling point due to boiling point elevation.
Correct Answer: A — Increases boiling point
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Q. What is the effect of adding a non-volatile solute to a solvent on its vapor pressure? (2023)
A.
Increases vapor pressure
B.
Decreases vapor pressure
C.
No effect
D.
Depends on the solute
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Solution
Adding a non-volatile solute decreases the vapor pressure of the solvent due to the solute particles occupying space at the surface.
Correct Answer: B — Decreases vapor pressure
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Q. What is the effect of connecting capacitors in parallel? (2023)
A.
Capacitance decreases
B.
Capacitance increases
C.
Capacitance remains the same
D.
Capacitance becomes zero
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Solution
When capacitors are connected in parallel, the total capacitance is the sum of the individual capacitances, thus it increases.
Correct Answer: B — Capacitance increases
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Q. What is the effect of cortisol on the body? (2019)
A.
Increases metabolism
B.
Reduces inflammation
C.
Stimulates insulin production
D.
Increases blood pressure
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Solution
Cortisol is a steroid hormone that helps reduce inflammation and is involved in the stress response.
Correct Answer: B — Reduces inflammation
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Q. What is the effect of deforestation on biodiversity? (2019)
A.
Increases biodiversity
B.
No effect on biodiversity
C.
Decreases biodiversity
D.
Enhances ecosystem services
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Solution
Deforestation leads to habitat loss, which significantly decreases biodiversity as many species lose their homes.
Correct Answer: C — Decreases biodiversity
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Q. What is the effect of deforestation on the carbon cycle? (2021)
A.
Increases carbon sequestration
B.
Decreases carbon dioxide levels
C.
Increases carbon dioxide levels
D.
Has no effect
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Solution
Deforestation increases carbon dioxide levels in the atmosphere as trees that absorb CO2 are removed.
Correct Answer: C — Increases carbon dioxide levels
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Q. What is the effect of dielectric on the capacitance of a capacitor? (2021)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Depends on the voltage
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Solution
Introducing a dielectric material between the plates of a capacitor increases its capacitance by a factor equal to the dielectric constant (κ) of the material.
Correct Answer: A — Increases capacitance
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Q. What is the effect of frequency on the inductive reactance? (2023)
A.
Directly proportional
B.
Inversely proportional
C.
No effect
D.
Depends on the resistance
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Solution
Inductive reactance is directly proportional to frequency; as frequency increases, inductive reactance increases.
Correct Answer: A — Directly proportional
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Q. What is the effect of gibberellins on seed germination? (2020)
A.
Inhibits germination
B.
Promotes germination
C.
No effect
D.
Causes premature germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer: B — Promotes germination
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Q. What is the effect of heavy metals in the environment? (2023)
A.
Nutrient enrichment
B.
Toxicity to organisms
C.
Soil improvement
D.
Water purification
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Solution
Heavy metals can be toxic to organisms, leading to bioaccumulation and harmful effects on ecosystems.
Correct Answer: B — Toxicity to organisms
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Q. What is the effect of high protein intake on urea production? (2022)
A.
Decreases urea production
B.
Increases urea production
C.
No effect on urea production
D.
Increases ammonia production
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Solution
High protein intake increases the production of urea as more amino acids are metabolized.
Correct Answer: B — Increases urea production
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Q. What is the effect of increasing pressure on the equilibrium of the reaction: 2N2(g) + 3H2(g) ⇌ 2NH3(g)? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase in temperature
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Solution
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. In this case, it shifts to the right, producing more NH3.
Correct Answer: B — Shift to the right
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