Q. The half-life of a first-order reaction is independent of the initial concentration. What is the expression for the half-life?
A.
t₁/₂ = 0.693/k
B.
t₁/₂ = k/0.693
C.
t₁/₂ = 1/k
D.
t₁/₂ = k/1
Show solution
Solution
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k.
Correct Answer: A — t₁/₂ = 0.693/k
Learn More →
Q. The half-life of a first-order reaction is independent of which of the following? (2022)
A.
Initial concentration
B.
Rate constant
C.
Temperature
D.
All of the above
Show solution
Solution
The half-life of a first-order reaction is independent of the initial concentration.
Correct Answer: A — Initial concentration
Learn More →
Q. The half-life of a first-order reaction is independent of which parameter?
A.
Initial concentration
B.
Rate constant
C.
Temperature
D.
All of the above
Show solution
Solution
The half-life of a first-order reaction is independent of the initial concentration.
Correct Answer: A — Initial concentration
Learn More →
Q. The Hardy-Weinberg principle describes the genetic equilibrium in a population. Which of the following is NOT a condition for this equilibrium? (1908)
A.
No mutations
B.
Random mating
C.
Natural selection
D.
Large population size
Show solution
Solution
Natural selection is not a condition for Hardy-Weinberg equilibrium; it actually disrupts genetic equilibrium by favoring certain alleles over others.
Correct Answer: C — Natural selection
Learn More →
Q. The heat capacity at constant volume (Cv) for an ideal gas is related to which of the following? (2023)
A.
Change in internal energy
B.
Change in enthalpy
C.
Change in entropy
D.
Change in Gibbs free energy
Show solution
Solution
The heat capacity at constant volume (Cv) is directly related to the change in internal energy of the system.
Correct Answer: A — Change in internal energy
Learn More →
Q. The heat capacity at constant volume (Cv) is defined as: (2022)
A.
The amount of heat required to raise the temperature of a substance by 1°C at constant pressure.
B.
The amount of heat required to raise the temperature of a substance by 1°C at constant volume.
C.
The total heat content of a substance.
D.
The heat required to change the phase of a substance.
Show solution
Solution
The heat capacity at constant volume (Cv) is defined as the amount of heat required to raise the temperature of a substance by 1°C at constant volume.
Correct Answer: B — The amount of heat required to raise the temperature of a substance by 1°C at constant volume.
Learn More →
Q. The heat capacity at constant volume is defined as: (2023)
A.
C_v = dQ/dT at constant pressure
B.
C_v = dQ/dT at constant volume
C.
C_v = dW/dT at constant volume
D.
C_v = dQ/dP at constant volume
Show solution
Solution
The heat capacity at constant volume (C_v) is defined as the amount of heat added to the system divided by the change in temperature at constant volume.
Correct Answer: B — C_v = dQ/dT at constant volume
Learn More →
Q. The heat capacity of a substance is defined as: (2023)
A.
The amount of heat required to raise the temperature of one gram by one degree Celsius.
B.
The amount of heat required to raise the temperature of one mole by one degree Celsius.
C.
The total heat content of the substance.
D.
The heat required to change the state of the substance.
Show solution
Solution
The heat capacity of a substance is defined as the amount of heat required to raise the temperature of one mole of the substance by one degree Celsius.
Correct Answer: B — The amount of heat required to raise the temperature of one mole by one degree Celsius.
Learn More →
Q. The image formed by a concave mirror when the object is placed between the focal point and the mirror is: (2022)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
Show solution
Solution
When the object is placed between the focal point and the mirror, the image formed is virtual and erect.
Correct Answer: B — Virtual and erect
Learn More →
Q. The impedance of an RLC circuit is given by which of the following formulas? (2022)
A.
Z = R + jX
B.
Z = √(R² + (X_L - X_C)²)
C.
Z = R + X_L + X_C
D.
Z = R - jX
Show solution
Solution
The impedance (Z) of an RLC circuit is given by Z = √(R² + (X_L - X_C)²), where X_L is the inductive reactance and X_C is the capacitive reactance.
Correct Answer: B — Z = √(R² + (X_L - X_C)²)
Learn More →
Q. The impedance of an RLC circuit is minimum when which condition is satisfied? (2022)
A.
XL = XC
B.
R = 0
C.
R = XL
D.
R = XC
Show solution
Solution
The impedance (Z) of an RLC circuit is minimum when the inductive reactance (X_L) equals the capacitive reactance (X_C), which is the condition for resonance.
Correct Answer: A — XL = XC
Learn More →
Q. The law that relates the pressure and volume of a gas at constant temperature is known as: (2019)
A.
Charles's Law
B.
Avogadro's Law
C.
Boyle's Law
D.
Ideal Gas Law
Show solution
Solution
Boyle's Law states that the pressure of a gas is inversely proportional to its volume at constant temperature.
Correct Answer: C — Boyle's Law
Learn More →
Q. The law that relates the volume of a gas to its temperature at constant pressure is known as: (2018)
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Graham's Law
Show solution
Solution
Charles's Law states that the volume of a gas is directly proportional to its absolute temperature at constant pressure.
Correct Answer: B — Charles's Law
Learn More →
Q. The magnetic field due to a straight current-carrying conductor at a distance r from the wire is given by which formula? (2019)
A.
B = μ₀I/(2πr)
B.
B = μ₀I/(4πr²)
C.
B = μ₀I/(2r)
D.
B = μ₀I/(πr)
Show solution
Solution
The magnetic field (B) due to a straight current-carrying conductor at a distance r is given by B = μ₀I/(2πr).
Correct Answer: A — B = μ₀I/(2πr)
Learn More →
Q. The magnetic field due to a straight current-carrying conductor at a distance r is given by which formula? (2022)
A.
B = μ₀I/2πr
B.
B = μ₀I/r
C.
B = μ₀I/4πr²
D.
B = μ₀I/2r
Show solution
Solution
The magnetic field (B) at a distance r from a straight current-carrying conductor is given by B = μ₀I/2πr.
Correct Answer: A — B = μ₀I/2πr
Learn More →
Q. The magnetic field inside a long solenoid is given by which of the following expressions? (2020)
A.
μ₀nI
B.
μ₀I/n
C.
nI/μ₀
D.
I/μ₀n
Show solution
Solution
The magnetic field (B) inside a long solenoid is given by B = μ₀nI, where n is the number of turns per unit length and I is the current.
Correct Answer: A — μ₀nI
Learn More →
Q. The magnetic field lines around a straight current-carrying conductor are in which shape? (2022)
A.
Straight lines
B.
Concentric circles
C.
Ellipses
D.
Spirals
Show solution
Solution
The magnetic field lines around a straight current-carrying conductor form concentric circles centered around the wire.
Correct Answer: B — Concentric circles
Learn More →
Q. The magnetic field lines around a straight current-carrying conductor are: (2022)
A.
Straight lines
B.
Concentric circles
C.
Elliptical
D.
Random
Show solution
Solution
The magnetic field lines around a straight current-carrying conductor form concentric circles centered around the wire.
Correct Answer: B — Concentric circles
Learn More →
Q. The magnetic field lines inside a bar magnet are directed from: (2019)
A.
North to South
B.
South to North
C.
East to West
D.
West to East
Show solution
Solution
The magnetic field lines inside a bar magnet are directed from the North pole to the South pole.
Correct Answer: A — North to South
Learn More →
Q. The maximum displacement from the mean position in simple harmonic motion is called: (2019)
A.
Amplitude
B.
Frequency
C.
Wavelength
D.
Period
Show solution
Solution
The maximum displacement is defined as the amplitude.
Correct Answer: A — Amplitude
Learn More →
Q. The maximum speed of a simple harmonic oscillator is 4 m/s. If the amplitude is 2 m, what is the angular frequency? (2019)
A.
2 rad/s
B.
4 rad/s
C.
1 rad/s
D.
8 rad/s
Show solution
Solution
Maximum speed (v_max) = ωA => ω = v_max / A = 4 m/s / 2 m = 2 rad/s.
Correct Answer: B — 4 rad/s
Learn More →
Q. The part of the flower that receives pollen is called the: (2022)
A.
Ovary
B.
Stigma
C.
Style
D.
Anther
Show solution
Solution
The stigma is the part of the pistil that receives pollen during fertilization.
Correct Answer: B — Stigma
Learn More →
Q. The phenomenon of electromagnetic induction was discovered by which scientist? (2022)
A.
Michael Faraday
B.
James Clerk Maxwell
C.
Nikola Tesla
D.
Albert Einstein
Show solution
Solution
Electromagnetic induction was discovered by Michael Faraday.
Correct Answer: A — Michael Faraday
Learn More →
Q. The potential energy stored in a capacitor is directly proportional to which of the following? (2023)
A.
Charge and Voltage
B.
Charge only
C.
Voltage only
D.
Capacitance only
Show solution
Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2, which shows it is directly proportional to both charge and voltage.
Correct Answer: A — Charge and Voltage
Learn More →
Q. The potential energy stored in a capacitor is given by which of the following formulas? (2020)
A.
1/2 CV^2
B.
CV
C.
Q^2/2C
D.
1/2 QV
Show solution
Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.
Correct Answer: A — 1/2 CV^2
Learn More →
Q. The pressure of a gas is inversely proportional to its volume at constant temperature is known as: (2022)
A.
Charles's Law
B.
Boyle's Law
C.
Avogadro's Law
D.
Ideal Gas Law
Show solution
Solution
Boyle's Law states that the pressure of a gas is inversely proportional to its volume at constant temperature.
Correct Answer: B — Boyle's Law
Learn More →
Q. The pressure of an ideal gas is directly proportional to its temperature when: (2022)
A.
Volume is constant
B.
Number of moles is constant
C.
Both volume and number of moles are constant
D.
None of the above
Show solution
Solution
According to Gay-Lussac's law, the pressure of an ideal gas is directly proportional to its temperature when the volume is held constant.
Correct Answer: A — Volume is constant
Learn More →
Q. The pressure of an ideal gas is inversely proportional to its volume at constant temperature. This relationship is known as: (2022)
A.
Charles's Law
B.
Boyle's Law
C.
Avogadro's Law
D.
Ideal Gas Law
Show solution
Solution
This relationship is known as Boyle's Law, which states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature.
Correct Answer: B — Boyle's Law
Learn More →
Q. The rate of a reaction is defined as the change in concentration of a reactant or product per unit time. What is the general form of the rate equation? (2023)
A.
Rate = k[A]^n
B.
Rate = k[A][B]
C.
Rate = k[A]^2[B]
D.
Rate = k[A] + [B]
Show solution
Solution
The general form of the rate equation is Rate = k[A]^n, where n is the order of the reaction.
Correct Answer: A — Rate = k[A]^n
Learn More →
Q. The rate of a reaction is directly proportional to the concentration of one reactant raised to the power of 2. What is the order of the reaction? (2022)
A.
Zero order
B.
First order
C.
Second order
D.
Third order
Show solution
Solution
If the rate is proportional to the concentration of one reactant raised to the power of 2, the reaction is second order.
Correct Answer: C — Second order
Learn More →
Showing 541 to 570 of 2637 (88 Pages)