Q. What is the gravitational field strength (g) at a distance r from the center of a planet of mass M? (2023)
A.
GM/r^2
B.
GM/r
C.
GMr^2
D.
G/Mr^2
Show solution
Solution
The gravitational field strength at a distance r from the center of a planet is given by g = GM/r^2.
Correct Answer: A — GM/r^2
Learn More →
Q. What is the gravitational field strength at a distance r from a mass M? (2022)
A.
GM/r
B.
GM/r^2
C.
Gm/r^2
D.
Gm/r
Show solution
Solution
The gravitational field strength (g) at a distance r from a mass M is given by g = GM/r^2.
Correct Answer: B — GM/r^2
Learn More →
Q. What is the gravitational potential energy of a 2 kg mass at a height of 10 m above the ground? (Take g = 9.8 m/s²) (2023)
A.
196 J
B.
98 J
C.
20 J
D.
78 J
Show solution
Solution
Gravitational potential energy (U) = mgh = 2 kg * 9.8 m/s² * 10 m = 196 J.
Correct Answer: A — 196 J
Learn More →
Q. What is the ground state electron configuration of an oxygen atom? (2023)
A.
1s² 2s² 2p⁴
B.
1s² 2s² 2p²
C.
1s² 2s² 2p⁶
D.
1s² 2s¹ 2p⁵
Show solution
Solution
Oxygen has 8 electrons, and its ground state electron configuration is 1s² 2s² 2p⁴.
Correct Answer: A — 1s² 2s² 2p⁴
Learn More →
Q. What is the hydrostatic pressure at a depth of 10 meters in water? (Density of water = 1000 kg/m³, g = 9.81 m/s²) (2022)
A.
9810 Pa
B.
10000 Pa
C.
98100 Pa
D.
1000 Pa
Show solution
Solution
Hydrostatic pressure is given by P = ρgh. Thus, P = 1000 kg/m³ * 9.81 m/s² * 10 m = 98100 Pa.
Correct Answer: C — 98100 Pa
Learn More →
Q. What is the ionization energy of an atom? (2023)
A.
Energy required to remove an electron
B.
Energy released when an electron is added
C.
Energy required to excite an electron
D.
Energy required to split the nucleus
Show solution
Solution
Ionization energy is defined as the energy required to remove an electron from an atom in its gaseous state.
Correct Answer: A — Energy required to remove an electron
Learn More →
Q. What is the ionization energy of hydrogen in eV? (2019)
A.
1.51 eV
B.
13.6 eV
C.
3.4 eV
D.
10.2 eV
Show solution
Solution
The ionization energy of hydrogen is 13.6 eV, which is the energy required to remove the electron from the ground state.
Correct Answer: B — 13.6 eV
Learn More →
Q. What is the least count of a standard vernier caliper? (2021)
A.
0.01 cm
B.
0.1 cm
C.
1 cm
D.
0.001 cm
Show solution
Solution
The least count of a standard vernier caliper is typically 0.01 cm.
Correct Answer: A — 0.01 cm
Learn More →
Q. What is the least count of a vernier caliper that can measure up to 0.01 cm? (2021)
A.
0.1 cm
B.
0.01 cm
C.
0.001 cm
D.
1 cm
Show solution
Solution
The least count of a vernier caliper is the smallest measurement it can accurately read, which is 0.01 cm in this case.
Correct Answer: B — 0.01 cm
Learn More →
Q. What is the magnetic field inside a toroidal solenoid? (2023)
A.
Zero
B.
Uniform and non-zero
C.
Varies with position
D.
Depends on the current only
Show solution
Solution
The magnetic field inside a toroidal solenoid is uniform and non-zero, and it is given by B = (μ₀NI)/(2πr), where N is the number of turns, I is the current, and r is the distance from the center.
Correct Answer: B — Uniform and non-zero
Learn More →
Q. What is the magnetic field strength at a distance 'r' from a long straight conductor carrying current 'I'? (2020)
A.
μ₀I/2πr
B.
μ₀I/4πr
C.
2μ₀I/πr
D.
μ₀I/πr
Show solution
Solution
The magnetic field strength (B) at a distance 'r' from a long straight conductor is given by the formula B = μ₀I/2πr.
Correct Answer: A — μ₀I/2πr
Learn More →
Q. What is the magnetic moment of a circular loop of radius r carrying a current I? (2021)
A.
πr²I
B.
2πrI
C.
Ir²
D.
πrI
Show solution
Solution
The magnetic moment (μ) of a circular loop is given by μ = I × A, where A is the area of the loop. For a circular loop, A = πr², thus μ = I × πr² = πr²I.
Correct Answer: A — πr²I
Learn More →
Q. What is the magnification produced by a concave mirror if the object distance is 10 cm and the image distance is 5 cm? (2019)
Show solution
Solution
Magnification (m) = -v/u. Here, v = -5 cm and u = -10 cm, so m = -(-5)/(-10) = 2.
Correct Answer: C — 2
Learn More →
Q. What is the magnification produced by a concave mirror when the object is placed at the focus? (2019)
A.
1
B.
0
C.
Infinity
D.
Less than 1
Show solution
Solution
When the object is placed at the focus of a concave mirror, the image is formed at infinity, leading to infinite magnification.
Correct Answer: C — Infinity
Learn More →
Q. What is the main assumption of the quantum mechanical model of the atom? (2023)
A.
Electrons are in fixed orbits
B.
Electrons have wave-like properties
C.
Electrons are stationary
D.
Electrons have no mass
Show solution
Solution
The quantum mechanical model assumes that electrons exhibit both particle and wave-like properties.
Correct Answer: B — Electrons have wave-like properties
Learn More →
Q. What is the main consequence of nuclear fusion? (2023)
A.
Release of energy
B.
Formation of heavier elements
C.
Emission of alpha particles
D.
All of the above
Show solution
Solution
The main consequence of nuclear fusion is the release of a significant amount of energy as lighter nuclei combine to form heavier nuclei.
Correct Answer: A — Release of energy
Learn More →
Q. What is the main difference between isotopes of an element? (2022)
A.
Number of protons
B.
Number of neutrons
C.
Number of electrons
D.
Chemical properties
Show solution
Solution
Isotopes of an element differ in the number of neutrons while having the same number of protons.
Correct Answer: B — Number of neutrons
Learn More →
Q. What is the main force that holds the nucleus together? (2020)
A.
Electromagnetic force
B.
Gravitational force
C.
Weak nuclear force
D.
Strong nuclear force
Show solution
Solution
The strong nuclear force is the primary force that holds the nucleons (protons and neutrons) together in the nucleus.
Correct Answer: D — Strong nuclear force
Learn More →
Q. What is the main function of a transistor? (2022)
A.
Rectification
B.
Amplification
C.
Capacitance
D.
Inductance
Show solution
Solution
The main function of a transistor is to amplify electrical signals.
Correct Answer: B — Amplification
Learn More →
Q. What is the main idea behind the concept of quantization in atomic physics? (2023)
A.
Energy levels are continuous
B.
Energy levels are discrete
C.
Electrons can exist anywhere
D.
Atoms are indivisible
Show solution
Solution
Quantization in atomic physics means that energy levels in an atom are discrete, not continuous.
Correct Answer: B — Energy levels are discrete
Learn More →
Q. What is the main limitation of the Rutherford model of the atom? (2019)
A.
It does not explain the stability of atoms
B.
It does not account for neutrons
C.
It cannot explain spectral lines
D.
It does not include electrons
Show solution
Solution
The Rutherford model fails to explain why electrons do not spiral into the nucleus, thus not accounting for atomic stability.
Correct Answer: A — It does not explain the stability of atoms
Learn More →
Q. What is the main product of the fusion of hydrogen nuclei? (2022)
A.
Helium
B.
Carbon
C.
Oxygen
D.
Nitrogen
Show solution
Solution
The fusion of hydrogen nuclei primarily produces helium, along with a release of energy.
Correct Answer: A — Helium
Learn More →
Q. What is the main purpose of a choke in an AC circuit? (2022)
A.
To increase current
B.
To decrease current
C.
To store energy
D.
To convert AC to DC
Show solution
Solution
A choke is used to decrease current in an AC circuit by providing inductive reactance.
Correct Answer: B — To decrease current
Learn More →
Q. What is the main purpose of using significant figures in measurements? (2019)
A.
To increase the number of digits
B.
To indicate precision
C.
To simplify calculations
D.
To convert units
Show solution
Solution
Significant figures indicate the precision of a measurement, reflecting the certainty of the digits.
Correct Answer: B — To indicate precision
Learn More →
Q. What is the main reason for the stability of the electron in an atom? (2019)
A.
Electrostatic attraction to the nucleus
B.
High energy levels
C.
Quantum tunneling
D.
Magnetic forces
Show solution
Solution
The stability of the electron in an atom is primarily due to the electrostatic attraction between the negatively charged electrons and the positively charged nucleus.
Correct Answer: A — Electrostatic attraction to the nucleus
Learn More →
Q. What is the mass defect of a nucleus? (2019)
A.
The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the nucleus in a different state
Show solution
Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, which accounts for the binding energy.
Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
Learn More →
Q. What is the maximum displacement from the mean position in simple harmonic motion called? (2022)
A.
Amplitude
B.
Frequency
C.
Period
D.
Wavelength
Show solution
Solution
The maximum displacement from the mean position in simple harmonic motion is called the amplitude.
Correct Answer: A — Amplitude
Learn More →
Q. What is the maximum number of electrons that can occupy the n=3 energy level in an atom? (2021)
Show solution
Solution
The maximum number of electrons in an energy level is given by the formula 2n². For n=3, it is 2(3)² = 18.
Correct Answer: C — 18
Learn More →
Q. What is the maximum number of electrons that can occupy the n=4 energy level? (2021)
Show solution
Solution
The maximum number of electrons in an energy level is given by 2n^2. For n=4, it is 2(4^2) = 32.
Correct Answer: B — 18
Learn More →
Q. What is the minimum thickness of a soap bubble for which the first order of bright fringe is observed in reflected light? (2020)
A.
λ/4
B.
λ/2
C.
λ
D.
3λ/4
Show solution
Solution
For the first order of bright fringe in reflected light, the minimum thickness of the soap bubble is λ/4 due to the phase change upon reflection.
Correct Answer: A — λ/4
Learn More →
Showing 601 to 630 of 910 (31 Pages)