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Practice Physics GS Questions and Answers

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:
When a forward bias is applied to a p-n junction, it
The storage battery of a car has an emf of 15 V. If the internal resistance of the battery is 0.5 Ω, what is the maximum current that can be drawn from th...
A battery of emf 12 V and internal resistance 4 ohm is connected to a resistor. If the current in the circuit is 0.6 A, what is the resistance of the resis...
A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A...
Is Ohm’s law universally applicable for all conducting elements?
In circular motion the direction of velocity changes at _______ points.
...
A constant retarding force of 20 N is applied to a body of mass 10 kg moving initially with a speed of 12 m s–1. How long does the body take to stop? ...
Two billiard balls each of mass 0.02 kg moving in opposite directions with speed 5 m s−1 collide and rebound with the same speed. What is the impulse imp...
If a medium has a critical angle for total internal reflection from the medium to vacuum as 90°, what is the velocity of light in the medium? (Take c = 3....
________ are the elements of group 18.
What is the momentum of an object of mass 1/2 m, moving with a velocity of 2V?
Going from fluorine to chlorine, to bromine and then to iodine, the electro negativity:
Which of the following does not affect the value of acceleration due to gravity?
If the distance between two consecutive crests is L, then the wavelength is given by______.
Which one of the following is the equation for Velocity Time relation?
If an agent does a work 'W' in time 't', then the power is given by:__________.
A porter lifts luggage of 20 kg from the ground and puts it on his head 2 m above the ground. Calculate the work done by him on the luggage (take g = 10ms-...
__________ is the metal used for making the filament of the light bulb.
The mass and energy equivalent to 1 a.m.u. respectively are -

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