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Practice Physics GS Questions and Answers

Two cities are 125 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 9.6 volt and the av...
A closely wound solenoid 40 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 2 cm. If the current carried is 8.0 A, esti...
What will be the energy possessed by a stationary object of mass 10 kg placed at a height of 20 m above the ground? (Take g = 10 m/s^2)
An object is placed at a distance of 10 cm in front of a double convex lens made of glass of refractive index 1.5. Both the radii of curvature of the lens ...
A 4 cm wire carrying a current of 15 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T....
Current sensitivity of a moving coil galvanometer is 9 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 30 div/V. The re...
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:
Which of the following rays are not deflected by a magnetic field?
A circular coil of wire consisting of 120 turns, each of radius 12 cm carries a current of 0.30 A. What is the magnitude of the magnetic field B at the cen...
What is the magnitude of magnetic force per unit length on a wire carrying a current of 10 A and making an angle of 30° with the direction of a uniform...
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the ...
A charged particle oscillates about its mean equilibrium position with a frequency of 105 Hz. What is the frequency of the electromagnetic waves produced b...
The electric and magnetic fields of an electromagnetic wave are _____________
A stone of mass 0.08 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the stone during its downward motion. Ignore air...
A constant retarding force of 60 N is applied to a body of mass 25 kg moving initially with a speed of 12 m s–1. How long does the body take to stop?...
A body of mass 3 kg is acted upon by two perpendicular forces 9 N and 12 N. Find the resultant of two forces and the acceleration of the body.
One kilogram of ice at 0° C is mixed with one kilogram of water at 85° C. The final temperature of the mixture is (Tale specific heat of water = 42...
A spherical black body with a radius of 8 cm radiates 450-watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in...
The absolute temperature of a body A is five times that of another body B. For two bodies, the difference in wave lengths at which energy radiated is maxim...
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...

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