Physics questions
20027 published questions with worked solutions.
- If _ v , _ x and _ m represent the wavelengths of visible light, X-rays and microwaves respectively, then :
- Two boys are standing at the ends A and B of a ground, where AB = a. The boy at B starts running in a direction perpendicular to...
- A 5-A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is :
- An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The...
- The moment of inertia of a uniform circular disc of radius R and mass M about an axis passing from the edge of the disc and...
- The total energy of an electron in the first excited state of hyrogen is about - 3.4 eV. Its kinetic energy in this state is :
- For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is :
- A ball is thrown vertically upward. It has a speed of 10 m/s when it has reached one half of its maximum height. How high does...
- The number of molecules in one liitre of an ideal gas at 300 K and 2 atmospheric pressure with mean kinetic energy 2 10^ -9 J per...
- The relative permittivity of distilled water is 81. The velocity of light in it will be : (Given _r = 1)
- List – I: (a) MI of the rod (length L, Mass M, about an axis to rod passing through the midpoint) (b) MI of the rod (length L,...
- In Young's double slit experiment, if the source of light changes from orange to blue then :
- A light cylindrical vessel is kept on a horizontal surface. Area of base is A. A hole of cross-sectional area 'a' is made just at...
- A particle starts executing simple harmonic motion (SHM) of amplitude 'a' and total energy E. At any instant, its kinetic energy...
- If 'f' denotes the ratio of the number of nuclei decayed (N_d) to the number of nuclei at t = 0 (N_0) then for a collection of...
- A ball is thrown up with a certain velocity so that it reaches a height 'h'. Find the ratio of the two different times of the...
- A 0.07 H inductor and a 12 resistor are connected in series to a 220. V, 50 Hz ac source. The approximate current in the circuit...
- Assertion A : If in five complete rotations of the circular scale, the distance travelled on main scale is 5 mm and there are 50...
- A body takes 4 min. to cool from 61° C to 59°C. If the temperature of the surroundings is 30°C, the time taken by the body to...
- In Bohr's atomic model, the electoron is assumed to revolve in a circular orbit of radius 0.5 Å. If the speed of electron is 2.2...