List of top Physics Questions

Which waves are used in sonography ?
While measuring acceleration due to gravity by a simple pendulum, a student makes a positive error of $1\%$ in the length of the pendulum and a negative error of $3\%$ in the value of the time period. His percentage error in the measurement of the value of $g$ will be
White light is passed through a prism of angle 5.If the refractive indices of red and blue colours are 1.641 and 1.659 respectively, the angle of dispersion between them is
Who discovered nuclear fission ?
Why 220 V ac is more dangerous than 220 V dc
Who was the first to introduce the concept of antiparticle theoretically?
Wires A and B are made from the same material. A has twice the diameter and three times the length of B. If the elastic limits are not reached, when each is stretched by the same tension, the ratio of energy stored in A to that in B is
With increase in temperature the viscosity of
With propagation of longitudinal waves through a medium, the quantity transmitted is
Within elastic limit, which of the following graphs correctly represents the variation of extension in the length of a wire with the external load?
With rise in temperature, the Young?? modulus of elasticity
Yellow light of wavelength $6000 ?$ produces fringes of width $0.8\, mm$ in Youngs double slit experiment. If the source is replaced by another monochromatic source of wavelength $7500 ?$ and the separation between the slits is doubled then the fringe width becomes
Young's modulus of steel is $1.9 \times 10^{11}\, N \,m^{-2}$. When expressed in $CGS$ units of dynes $cm^{-2}$, it will be equal to ($1 \,N = 10^5$ dyne, $1\, m^2 = 10^4\, cm^2$)
Young?? modulus of the wire depends on
You are given two spheres of same material and radii $10\,cm$ and $20\, cm$. They are heated to the same temperature. They are placed in the same environment. The ratio of their rates of cooling will be
You are given four sources of light each one providing a light of a single colour - red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is $90^{\circ}$. Which of the following statements is correct, if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
Zero error, instrumental error and personal errors can be respectively of group
Youngs's modulus for perfectly plastic body is
A person moves 30 m north, from there 20m east and finally $30\sqrt{2}$ m south-west from there His displacement from initial position is.
Which of the following elements when added as an impurity into the germanium produces a p-type semiconductor?
Which of the following electromagnetic waves is used in medicine to destroy cancer cells?
Which of the following electromagnetic wave has highest wavelength ?
Which of the following does not use the application of eddy current?
Which of the following effects the elasticity of a substance
Which of the following displacement-time graph is impossible in the case of a particle in one dimensional motion ?