Q. The female reproductive part of a flower is called the: (2022)
A.
Stamen
B.
Pistil
C.
Petal
D.
Sepal
Show solution
Solution
The pistil is the female reproductive part of the flower, consisting of the ovary, style, and stigma.
Correct Answer:
B
— Pistil
Learn More →
Q. The five-kingdom classification system was proposed by: (2019)
A.
Linnaeus
B.
Whittaker
C.
Haeckel
D.
Darwin
Show solution
Solution
The five-kingdom classification system was proposed by Robert Whittaker.
Correct Answer:
B
— Whittaker
Learn More →
Q. The force experienced by a charged particle moving in a magnetic field is given by which law? (2020)
A.
Coulomb's Law
B.
Lorentz Force Law
C.
Faraday's Law
D.
Ampere's Law
Show solution
Solution
The force experienced by a charged particle moving in a magnetic field is described by the Lorentz Force Law, F = q(v × B).
Correct Answer:
B
— Lorentz Force Law
Learn More →
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
Show solution
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
Learn More →
Q. The force on a charged particle 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
Show solution
Solution
The force on a charged particle in a magnetic field is maximum when the angle between the velocity and the magnetic field is 90 degrees.
Correct Answer:
B
— 90 degrees
Learn More →
Q. The force on a charged particle moving in a magnetic field is given by which law? (2021)
A.
Coulomb's Law
B.
Lorentz Force Law
C.
Faraday's Law
D.
Ampere's Law
Show solution
Solution
The force (F) on a charged particle moving in a magnetic field is described by the Lorentz Force Law, F = q(v × B), where q is the charge, v is the velocity, and B is the magnetic field.
Correct Answer:
B
— Lorentz Force Law
Learn More →
Q. The force on a charged particle moving in a magnetic field is maximum when the angle between the velocity and magnetic field is: (2021)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
45 degrees
Show solution
Solution
The force on a charged particle in a magnetic field is given by F = qvB sin(θ). The force is maximum when sin(θ) = 1, which occurs at θ = 90 degrees.
Correct Answer:
B
— 90 degrees
Learn More →
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
Show solution
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
Learn More →
Q. The force on a charged particle moving in a magnetic field is maximum when: (2021)
A.
The particle moves parallel to the field
B.
The particle moves perpendicular to the field
C.
The particle is at rest
D.
The particle moves in a circular path
Show solution
Solution
The force on a charged particle moving in a magnetic field is maximum when the particle moves perpendicular to the field.
Correct Answer:
B
— The particle moves perpendicular to the field
Learn More →
Q. The forward bias condition in a diode occurs when: (2020)
A.
Anode is at a higher potential than cathode
B.
Cathode is at a higher potential than anode
C.
Both terminals are at the same potential
D.
None of the above
Show solution
Solution
In forward bias, the anode is connected to a higher potential than the cathode, allowing current to flow.
Correct Answer:
A
— Anode is at a higher potential than cathode
Learn More →
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
Show solution
Solution
Angular frequency (ω) = 2πf = 2π × 5 = 10 rad/s
Correct Answer:
A
— 10 rad/s
Learn More →
Q. The frequency of a tuning fork is 440 Hz. What is the time period of the fork? (2019)
A.
0.00227 s
B.
0.0045 s
C.
0.01 s
D.
0.005 s
Show solution
Solution
Time period (T) = 1 / frequency (f) = 1 / 440 Hz ≈ 0.00227 s.
Correct Answer:
A
— 0.00227 s
Learn More →
Q. The frequency of a tuning fork is 440 Hz. What is the time period of the sound wave produced? (2022)
A.
0.00227 s
B.
0.0045 s
C.
0.01 s
D.
0.005 s
Show solution
Solution
Time period (T) = 1 / frequency (f) = 1 / 440 Hz ≈ 0.00227 s.
Correct Answer:
A
— 0.00227 s
Learn More →
Q. The frequency of a wave is 10 Hz. What is the frequency of its second harmonic? (2021)
A.
5 Hz
B.
10 Hz
C.
20 Hz
D.
30 Hz
Show solution
Solution
The frequency of the second harmonic is twice the fundamental frequency. Therefore, if the fundamental frequency is 10 Hz, the second harmonic frequency is 2 * 10 Hz = 20 Hz.
Correct Answer:
C
— 20 Hz
Learn More →
Q. The frequency of a wave is doubled. How does this affect its wavelength if the speed of the wave remains constant? (2022)
A.
Wavelength doubles
B.
Wavelength halves
C.
Wavelength remains the same
D.
Wavelength quadruples
Show solution
Solution
According to the wave equation v = fλ, if frequency (f) is doubled and speed (v) remains constant, wavelength (λ) must halve.
Correct Answer:
B
— Wavelength halves
Learn More →
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)
Show solution
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)
Learn More →
Q. The fusion of male and female gametes in plants is known as: (2021)
A.
Fertilization
B.
Pollination
C.
Germination
D.
Mitosis
Show solution
Solution
Fertilization is the process where the male gamete (sperm) fuses with the female gamete (egg) to form a zygote.
Correct Answer:
A
— Fertilization
Learn More →
Q. The gravitational field strength at a distance r from a mass M is given by which formula? (2022)
A.
GM/r^2
B.
Gm/r^2
C.
M/r^2
D.
G/r^2
Show solution
Solution
The gravitational field strength is given by E = GM/r^2.
Correct Answer:
A
— GM/r^2
Learn More →
Q. The gravitational force between two objects is 10 N. If the distance between them is tripled, what will be the new force? (2022)
A.
10 N
B.
5 N
C.
1.11 N
D.
0.11 N
Show solution
Solution
If the distance is tripled, the force becomes F/9, which is approximately 1.11 N.
Correct Answer:
C
— 1.11 N
Learn More →
Q. The gravitational force is a function of which of the following? (2023)
A.
Masses and distance
B.
Masses only
C.
Distance only
D.
Masses and velocity
Show solution
Solution
The gravitational force depends on the masses of the objects and the distance between them, as per Newton's law of gravitation.
Correct Answer:
A
— Masses and distance
Learn More →
Q. The gravitational force is a: (2023)
A.
Contact force
B.
Non-contact force
C.
Frictional force
D.
Centripetal force
Show solution
Solution
Gravitational force acts at a distance without any physical contact between the masses.
Correct Answer:
B
— Non-contact force
Learn More →
Q. The gravitational potential energy of an object is defined as: (2023)
A.
The work done against gravity
B.
The kinetic energy of the object
C.
The energy due to motion
D.
The energy stored in the object
Show solution
Solution
Gravitational potential energy is defined as the work done against gravity to move an object to a height.
Correct Answer:
A
— The work done against gravity
Learn More →
Q. The gravitational potential energy of an object of mass m at a height h is given by which formula? (2023)
A.
mgh
B.
gh/m
C.
mg/h
D.
m/hg
Show solution
Solution
The gravitational potential energy is given by the formula U = mgh.
Correct Answer:
A
— mgh
Learn More →
Q. The gravitational potential energy of an object of mass m at a height h is given by: (2022)
A.
mgh
B.
gh/m
C.
mg/h
D.
mgh²
Show solution
Solution
Gravitational potential energy is calculated using the formula U = mgh.
Correct Answer:
A
— mgh
Learn More →
Q. The gravitational potential energy of an object of mass m at height h is given by which formula? (2023)
A.
mgh
B.
gh/m
C.
mg/h
D.
m/hg
Show solution
Solution
The gravitational potential energy is given by the formula U = mgh, where m is mass, g is acceleration due to gravity, and h is height.
Correct Answer:
A
— mgh
Learn More →
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
Show solution
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
Learn More →
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
Show solution
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
Learn More →
Q. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life? (2022)
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 the initial concentration of the reactant. What is the expression for the half-life (t₁/₂)? (2022)
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 the initial concentration of the reactant. What is the expression for the half-life (t1/2)? (2022)
A.
t1/2 = 0.693/k
B.
t1/2 = k/0.693
C.
t1/2 = 1/k
D.
t1/2 = k/2
Show solution
Solution
The half-life of a first-order reaction is given by the expression t1/2 = 0.693/k, where k is the rate constant.
Correct Answer:
A
— t1/2 = 0.693/k
Learn More →
Showing 1981 to 2010 of 5509 (184 Pages)