Practice questions
88551 published questions with worked solutions.
- A sample of radioactive material A, that has an activity of 10 mCi (1 Ci = 3.7 10^ 10 decays/s), has twice the number of nuclei...
- A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass...
- For a uniformly charged ring of radius R, the electric field on its axis has the largest magnitude at a distance h from its...
- Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm^2, is v. If electron density in...
- A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in...
- Surface of certain metal is first illuminated with light of wavelength _1 = 350 nm and then, by light of wavelength _2 = 540 nm....
- A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m (m << M). When the car is at rest, the...
- Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for...
- If the angular momentum of a planet of mass m, moving around the Sun in a circular orbit is L, about the center of the Sun, its...
- A particle is moving with a velocity v = K(y i + x j), where K is a constant. The general equation for its path is:
- A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains...
- Three charges +Q, q, +Q are placed respectively, at distance, 0, d/2 and d from the origin, on the x-axis. If the net force...
- A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The...
- In general, the properties that decrease and increase down a group in the periodic table, respectively, are:
- The major product of following reaction is: R - C N [(2) H_2O] (1) AlH(i - Bu)_2 ?
- The ore that contains both iron and copper is:Not in JEE Main or NEET syllabus
- The anodic half cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO_4 electrolyzed in g...
- The following results were obtained during kinetic studies of the reaction: 2A + B → Products | Experiment | [A] (in mol L^ -1 )...
- For emission line of atomic hydrogen from n_i = 8 to n_f = n, the plot of wave number ( ) against ( 1 n^2 ) will be (The Rydberg...
- The correct decreasing order for acid strength is: