Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics bharat and science scope and progress of physics recent advancement in medical technology contribution of physics in technology and society

Electron microscope is based on which scientific principle?

  1. Light amplification by stimulated emission of radiation

  2. Wave nature of electrons

  3. Digital logic

  4. Reflection of ultrasonic waves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electron microscope is based on the principle of De-Broglie hypothesis of wave-nature of electrons.

Multiple choice physics bharat and science scope and progress of physics recent advancement in medical technology contribution of physics in technology and society

Werner Heisenberg is known for his work on 

  1. Inelastic scattering of light by molecules

  2. Quantum mechanics: Uncertainty principle

  3. Theory of super conductivity

  4. Expanding universe
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B

In quantum mechanics, the uncertainty principle, also known as Heisenberg's uncertainty principle, is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position and momentum, cannot be known simultaneously.

Multiple choice physics bharat and science scope and progress of physics recent advancement in medical technology contribution of physics in technology and society

Bose-Einstein condensate is based on which scientific principle?

  1. Magnetic confinement of plasma

  2. Trapping and cooling of atoms by laser beams and magnetic fields

  3. Wave nature of electrons

  4. Motion of charged particles in electromagnetic fields
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bose-Einstein  condensate is made by trapping and cooling of atoms by laser beams and magnetic fields.

Multiple choice physics bharat and science scope and progress of physics recent advancement in medical technology contribution of physics in technology and society

What was the major contribution/discoveries of  Archimedes?

  1. Principle of buoyancy; Principle of the lever

  2. Wave theory of light

  3. Laws of electromagnetic induction

  4. Generation of electromagnetic waves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Archimedes discovered the principal of buoyancy when he was taking a both observed watts getting displaced when he got into the both tub.He also discovered the principle of the lever.(a)

Multiple choice physics bharat and science scope and progress of physics recent advancement in medical technology contribution of physics in technology and society

The Giant Metrewave Radio Telescope (GMRT) is related to _________________.

  1. Superconductivity

  2. Generation, propagation and detection of electromagnetic waves

  3. Detection of cosmic radio waves

  4. Trapping and cooling of atoms by laser beams and magnetic fields
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Giant Metrewave Radio Telescope (GMRT) is related to Detection of cosmic radio waves.

Multiple choice physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

A free nucleus of mass $24$ u emits a gamma photon [when initially at rest]. The energy of the photon is $7$ MeV. The recoil energy of the nucleus in keV is 

  1. $1.1$

  2. $1.2$

  3. $1.0$

  4. $1.3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using conservation of momentum, the recoil energy E_r = (E_gamma)^2 / (2 * M * c^2). With E_gamma = 7 MeV and M = 24 u (approx 24 * 931.5 MeV/c^2), the recoil energy is approximately 1.1 keV.

Multiple choice physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

Hydrogen atom will be in its ground state,if its electron is in

  1. any energy level

  2. the lowest energy state

  3. the highest energy state

  4. the intermediate state
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrogen atom has one electron. Depending upon the electron residing in which energy state hydrogen energy varies. So, for hydrogen atom to be in ground state electron should be in lowest energy state.

Multiple choice physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

When writing electron configurations,electrons are represented in their lowest possible energy state.Which of the following state is this ?

  1. excited state.

  2. lowest state.

  3. configuration state.

  4. ground state.

  5. unenergetic state.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Aufbau's principle, electrons are filled in the atomic orbitals in order of lower energy to the higher energy starting from the orbital of lowest possible energy known as the ground state.

Multiple choice physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

A beam of ultraviolet radiation having wavelength between $100nm$ and $200nm$ is incident on a sample of atomic hydrogen gas. Assuming that the atoms are in ground state, which wavelengths will have low intensity in the transmitted beam? 

  1. $104nm$

  2. $103nm$

  3. $105nm$

  4. $100nm$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Energy corresponding to wavelength 100nm, $\dfrac{1242eV}{100}=12.42 eV$

Energy corresponding to wavelength 200nm, $\dfrac{1242eV}{200}=6.21 eV$
Energy required from ground state to first excited stage:
$E _2-E _1=13.6-3.4=10.2 eV$
Energy required from ground state to second excited stage:
$E _3-E _1=13.6-13.6-1.5=12.1  eV$

Energy required from ground state to third excited stage:
$E _3-E _1=13.6-0.85=12.75  eV$

At 10.2 eV,
$Wavelength 1=\dfrac{1242}{10.2}=122nm$

At 12.1 eV,
$Wavelength 2=\dfrac{1242}{12.1}=103nm$



Multiple choice physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

The ground state energy of the electron in hydrogen atom is equal to :

  1. the ground state energy of the electron in $ { He }^{ + } $

  2. the first excited state energy of the electron in $ { He }^{ + } $

  3. the first excited state energy of the electron in $ { Li }^{ +2 } $

  4. the ground state energy of the electron in $ { Be }^{ +3 } $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The energy levels of hydrogen-like ions are given by E = -13.6 * Z^2 / n^2. For H (Z=1, n=1), E = -13.6 eV. For He+ (Z=2), the first excited state is n=2, so E = -13.6 * (2^2) / (2^2) = -13.6 eV.