It is advised to drive along the slippery road slowly, because:
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The angular acceleration is known as the rate of change of _________.
A ball of mass 10 g hits a hard surface vertically with a speed of 5 m/s and rebounds with the same speed. The ball remains in contact with the surface for 0.01 s. The average force exerted by the surface on the ball is
An earth satellite is moving around the earth in a circular orbit. In such case, what is conserved?
To complete one revolution around Earth, communication satellites take
The property by virtue of which the free surface of a liquid at rest behaves like an elastic stretched membrane tending to contract so as to occupy minimum surface area is known as
In an adiabatic process gas is reduced to quarter of its volume. What would happen to its pressure? Given ratio of specific heats γ= 2
Electric flux will be maximum if the angle between the field lines and area vector is ______
What is the angle between the electric dipole moment and the electric field on the equatorial line of the dipole?
On moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
What will be the effect on capacitance, if the distance between the parallel plates reduced to one-third of its original value?
What should be the radius of an isolated spherical conductor so that it has a capacity of 2μF?
The magnetic field between the Horizontal poles of an electromagnet in is uniform at any time, but its magnitude is increasing at the rate of 0.020 T/s.The area of a loop made of perfect insulating material is 120cm2.This loop is kept horizontally in the magnetic field. Induced emf and the induced current in the circuit are
A light bulb is rated at 50W for a 220 V supply. The resistance of the bulb, the peak voltage of the source and the rms current through the bulb are
A convex lens forms a real image of an object on a screen; the magnification of the image being 3/2. The object and the screen are kept fixed and the lens is moved through a distance of 16 cm when a sharp image is again formed on the screen; the magnification now being 2/3. What is the focal length of the lens?
For a rectangular slab, refraction takes place at
A beam of light has a wavelength of 650 nm in vacuum. What is the wavelength of these waves in the liquid whose index of refraction at this wavelength is 1.47?
A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?
The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is
Which of these statements about Bohr model applied to hydrogen atom correct?
The name of a diode that can be used to provide a variable capacitance is:
Photons of energy 1eV and 2.5 eV successively illuminate a metal whose work function is 0. 5 eV. The ratio of the maximum speeds of the electrons emitted will be
The material which practically does not show elastic after effect is
State the part of the electromagnetic spectrum to which 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift)..Belongs