- 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:
- The curie law, x = C/T, expressing susceptibility x varying with absolute temperature T, is obeyed by:
- 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 5 V battery of negligible internal resistance is connected across a 190 V battery and a resistance of 37 Ω as shown in the figure. Find the value of th...
- A potentiometer wire of length 1 m has a resistance of 5 Ω. It is connected to a 8 V battery in series with a resistance of 15 Ω. Determine the emf 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 refractive index of glass is 1.5. What is the speed of light in glass? Speed of light in vacuum is 3.0 x 108 m/s.
- 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? ...
- A rocket with a lift-off mass 10,000 kg is blasted upwards with an initial acceleration of 5.0 m s–2. Calculate the initial thrust (force) of the blast. ...
- 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....
- What is the focal length of a double convex lens for which the radius of curvature of each surface is 30 cm and the refractive index of glass is 2.50 ?
- Specific heat of aluminum when 26000 J of energy is supplied to 4 kg block and it's temperature rises from 25°C to 35°C is
- ________ are the elements of group 18.
- What is the momentum of an object of mass 1/2 m, moving with a velocity of 2V?

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