Physics Mock Tests

The SI unit of electric current is:

Newton's first law of motion is also known as the law of:

The SI unit of electric current is:

The following passage is an excerpt from an article about physics. Wave-particle duality is the concept that every quantum entity exhibits both wave-like and particle-like properties. This principle is fundamental to quantum mechanics and applies to both light and matter. The wave nature of light is demonstrated by phenomena such as interference and diffraction: when light passes through two closely spaced slits, it produces an interference pattern of alternating bright and dark bands on a screen, which can only be explained by treating light as a wave. However, the photoelectric effect, described in the previous passage, demonstrates light's particle nature, as it shows that light energy is delivered in discrete packets (photons). Louis de Broglie extended the concept of wave-particle duality to matter in 1924, proposing that particles such as electrons also exhibit wave properties. He formulated the de Broglie wavelength equation, which relates the wavelength (λ) of a particle to its momentum (p): λ = h/p, where h is Planck's constant. This means that any moving particle has an associated wavelength, though for macroscopic objects, this wavelength is so small that wave effects are undetectable. The wave nature of electrons was confirmed experimentally by the Davisson-Germer experiment in 1927, which showed that electrons diffracted by a crystal lattice produced an interference pattern similar to that produced by X-rays. The double-slit experiment performed with individual electrons is particularly striking: when electrons are fired one at a time through two slits, they gradually build up an interference pattern on the detector screen, suggesting that each electron passes through both slits simultaneously as a wave. However, if a detector is placed at the slits to determine which slit each electron passes through, the interference pattern disappears and the electrons behave like particles, arriving at the screen in two distinct bands. This illustrates the principle of complementarity: wave and particle behaviors are complementary aspects of quantum entities, and the experimental setup determines which aspect is manifested. According to the passage, what happens to the electron interference pattern in the double-slit experiment when a detector is placed at the slits?

What is the unit of electrical resistance?

With reference to semiconductor physics, consider the following statements: 1. In an intrinsic semiconductor, the number of electrons in the conduction band is equal to the number of holes in the valence band. 2. The band gap of silicon is approximately 1.1 eV at room temperature, while that of germanium is approximately 0.7 eV. 3. Doping silicon with a small amount of phosphorus (Group 15) creates a p-type semiconductor. Which of the statements given above is/are correct?

Which of the following devices is used to measure atmospheric pressure?

The SI unit of electric charge is: