Physics questions
20027 published questions with worked solutions.
- Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts...
- A uniform metallic wire has a resistance of 18 Ω and is bent into an equilateral triangle. Then, the resistance between any two...
- A plano convex lens of refractive index _1 and focal length f_1 is kept in contact with another plano concave lens of refractive...
- In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a...
- A homogeneous solid cylindrical roller of radius R and mass M is pulled on a cricket pitch by a horizontal force F. Assuming...
- A string of length 1 m and mass 5 g is fixed at both ends. The tension in the string is 8.0 N. The string is set into vibration...
- A 2 W carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed...
- If the magnetic field of a plane electromagnetic wave is given by (the speed of light = 3 10^ 8 m/s) B = 100 10^ -6 [2 2 10^ 15...
- A charge Q is distributed over three concentric spherical shells of radii a, b, c (a < b < c) such that their surface charge...
- A piece of wood of mass 0.03 kg is dropped from the top of a 100 m height building. At the same time, a bullet of mass 0.02 kg is...
- Let a total charge 2Q be distributed in a sphere of radius R, with the charge density given by ρ(r) = kr, where r is the distance...
- A Carnot engine has an efficiency of 1/6. When the temperature of the sink is reduced by 62ºC, its efficiency is doubled. The...
- A plane electromagnetic wave having a frequency ν = 23.9 GHz propagates along the positive z-direction in free space. The peak...
- One kg of water, at 20ºC, is heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of...
- In an amplitude modulator circuit, the carrier wave is given by, C(t) = 4 sin(20000πt) while modulating signal is given by, m(t)...Not in JEE or NEET syllabus
- The electron in a hydrogen atom first jumps from the third excited state to the second excited state and subsequently to the...
- A system of three polarizers P_1, P_2, P_3 is set up such that the pass axis of P_3 is crossed with respect to that of P_1. The...
- A moving coil galvanometer, having a resistance G, produces full scale deflection when a current I_g flows through it. This...
- A solid sphere, of radius R acquires a terminal velocity v_1 when falling (due to gravity) through a viscous fluid having a...
- Two sources of sound S_1 and S_2 produce sound waves of same frequency 660 Hz. A listener is moving from source S_1 towards S_2...