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Practice Physics GS Questions and Answers

The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 ×108 m s-1)
A beam of light consisting of two wavelengths, 600 nm and 420 nm, is used to obtain interference fringes in a Young’s double-slit experiment. Find th...
A 220 V, 100 W bulb is connected to a 110 V source. Calculate the power consumed by the bulb
Which of the following materials is used for the generation of ultrasonic waves by using magnetostriction effect?
Which of the following particles in motion, having the same kinetic energy, has the shortest wavelength?
A positron is an anti-particle of an electron, having the same mass but opposite charge to electron. Then, the minimum energy released in annihilation of m...
Ultrasonic pulse echo technique, a non-destructive ultrasonic testing, is employed for any possible flaw detection in a metallic bar of thickness 30 cm. If...
In an experimental arrangement of a Fresnel's biprism, monochromatic light of wavelength 2. is used to produce interference fringe pattern. On introducing ...
The frequency of ultrasonic waves is:
A sugar solution in a tube of length 2.0 dm produces optical rotation of 12°. Then, the sugar solution is diluted to one half of its initial concentration...
Which of the following equations correctly represents the momentum p of a photon of Energy E?
The group velocity of matter waves associated with a moving particle is:
The speed of a fast moving electron, having total energy of 2 MeV, is nearly:
Which of the following materials behaves as a dielectric?
The ratio of the amplitudes of the electric field and magnetic field strengths has the same dimensions as that of:
For a non-relativistic particle, the ratio of phase velocity to group velocity of de Broglie waves is:
Which of the following phenomena establishes the transverse nature of light waves?
Ultrasonic waves, propagating through a medium, can be detected by:
Which of the following is the energy quantum of radiation?
The refractive indices of quartz crystal for right handed and left handed circularly polarized light of wavelength 762.9 nm are 1.5391 and 1.5392 respectiv...
The wavelength produced by a He-Ne laser corresponds to the transition in:
In order to investigate the internal atomic structure of crystals, we make use of:
A ray of light is incident on a transparent medium at an angle of 60°. The reflected ray of light is found to be completely Q.4 polarized. Then, the refra...
A meter stick moves along its length with a certain speed. The apparent length of the moving meter stick as measured by a stationary observer on the ground...
Which of the following materials exhibits piezoelectric effect?
The experimental evidence that the electron exhibits wave-like characteristics was first provided by:
Newton's rings can be obtained in:
Which of the following materials is most suitable for marking electromagnetic and core of transformer?
Which of the following optical phenomena CANNOT convert unpolarised light to plane polarised light?
The Pointing vector of electromagnetic waves has the same dimensions as that of:
Two long parallel conductors are placed 8mm apart from each other carrying a current of 120 Amperes. What will be force per meter length of each one?
The potential inside a charged hollow sphere is __________.
An electric dipole when held at 30 ֯ with respect to a uniform electric field of 103 N/c experience a torque of 12 × 10-26 Nm. Calculate dipole moment of...
A plane electromagnetic wave travels in vacuum along the z-direction. If the frequency of the wave is 20 MHz, what is its wavelength?
What is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is 2.5?
The correct option, if speeds of gamma rays, X-rays and microwave are Vg, Vx an Vm respectively will be ...
Electromagnetic waves travelling in a medium having relative permeability μr = 1.2 and relative permittivity Er = 0.012. The speed of electromagnetic wave...
In half-wave rectifier, what is the output frequency if the input frequency is 40 Hz. What is the output frequency of a full-wave rectifier for the same in...
In an n-type silicon, which of the following statements is true:

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