Practice questions
88551 published questions with worked solutions.
- Let z=(1+i)(1+2i)(1+3i) (1+ni), where i= -1 . If |z|^2=44200, then n is equal to -
- Let S be a set of 5 elements and P(S) denote the power set of S. Let E be an event of choosing an ordered pair (A, B) from the...
- The number of elements in the set x [0,180^ ]: (x+100^ ) = (x+50^ ) x (x-50^ ) is _____ .Not in JEE Main syllabus
- In a vernier callipers, 50 vernier scale divisions are equal to 48 main scale divisions. If one main scale division = 0.05 mm,...
- Five persons P1, P2, P3, P4 and P5 recorded object distance (u) and image distance (v) using same convex lens having power +5 D...
- When a light of a given wavelength falls on a metallic surface the stopping potential for photoelectrons is 3.2 V. If a second...
- The fifth harmonic of a closed organ pipe is found to be in unison with the first harmonic of an open pipe. The ratio of lengths...
- The binding energy for the following nuclear reactions are expressed in MeV. _2He^3+_0n^1 _2He^4+20 MeV _2He^4+_0n^1 _2He^5-0.9...
- A cubical block of density _b=600 kg/m³ floats in a liquid of density _e=900 kg/m³. If the height of block is H=8.0 cm then...
- A moving coil galvanometer of resistance 100 shows a full scale deflection for a current of 1 mA. The value of resistance...
- In the Young's double slit experiment the intensity produced by each one of the individual slits is I_0. The distance between two...
- Distance between an object and three times magnified real image is 40 cm. The focal length of the mirror used is _____ cm.
- When 300 J of heat given to an ideal gas with C_p= 7 2 R its temperature raises from 20°C to 50°C keeping its volume constant....
- In a meter bridge experiment to determine the value of unknown resistance, first the resistances 2 and 3 are connected in the...
- A soap bubble of surface tension 0.04 N/m is blown to a diameter of 7 cm. If (15000-x) J of work is done in blowing it further to...
- Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and 15 k Nm⁻²...
- Consider the following gaseous equilibrium in a closed container of volume "V" at T(K). P_2(g)+Q_2(g) 2PQ(g) 2 moles each of...
- Pair of species among the following having same bond order as well as paramagnetic character will be-
- The wavelength of light absorbed for the following complexes are in the order. [Co(NH_3)_6]^ 3+ (I); [Co(H_2O)_6]^ 3+ (II);...
- A student has planned to prepare acetanilide from aniline using acetic anhydride. The student has started from 9.3 g of aniline....