Challenging Physics Concepts

What is the role of the Higgs boson in particle physics?

• The Higgs boson is a type of dark matter.

• The Higgs boson gives mass to elementary particles through the Higgs field.

• The Higgs boson creates new particles from energy.

• The Higgs boson is responsible for electromagnetic force.

What is the difference between fission and fusion in nuclear physics?

• Fission occurs in stars; fusion occurs in reactors.

• Fission combines heavy nuclei; fusion splits light nuclei.

• Fission splits heavy nuclei; fusion combines light nuclei.

• Fission and fusion both involve splitting nuclei.

If a gas expands in vacuum without doing external work, the process is called:

• Isothermal

• Adiabatic

• Free expansion

• Polytropic

The photoelectric effect proves that light behaves as:

• A wave

• A particle

• A gas

• Both wave and particle

Which of the following is NOT true about Bohr’s atomic model?

• Electrons move in fixed orbits

• Energy is quantized

• Electrons emit radiation continuously

• Angular momentum is quantized

X-rays are produced when:

• Electrons jump from higher to lower energy levels

• Electrons strike a metal target

• A nucleus undergoes beta decay

• Protons collide at high speed

The force on a charged particle moving in a magnetic field is maximum when the angle between velocity and field is:

• 0°

• 45°

• 90°

• 180°

If an object moves at a speed close to the speed of light, what happens to its length (as observed from a stationary frame)?

• Increases

• Decreases

• Remains same

• goes infinite

Lenz’s law is a consequence of:

• Conservation of energy

• Conservation of momentum

• Conservation of mass

• Conservation of charge

Which of the following is not a characteristic of a standing wave?

• Nodes remain stationary

• Antinodes vibrate with maximum amplitude

• Energy is transferred along the medium

• It is formed by the interference of two waves traveling in opposite directions