Practice questions
88551 published questions with worked solutions.
- A plane polarized monochromatic EM wave is traveling a vacuum along z direction such that at t = t_1 it is found that the...
- A current of 1A is flowing on the sides of an equilateral triangle of side 4.5 10^ -2 m. The magnetic field at the center of the...
- A constant voltage is applied between two ends of metallic wire. If the length is halved and the radius of the wire is doubled,...
- The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance 49 µH and a capacitance of 2.5 nF....Not in JEE or NEET syllabus
- A proton of mass m collides elastically with a particle of unknown mass at rest. After the collision, the proton and the unknown...
- A disc rotates about its axis of symmetry in a horizontal plane at a steady rate of 3.5 revolutions per second. A coin placed at...
- 5 beats/second are heard when a tuning fork is sounded with a sonometer wire under tension, when the length of the sonometer wire...
- Two Carnot engines A and B are operated in series. Engine A receives heat from a reservoir at 600 K and rejects heat to a...
- A convergent doublet of separated lenses, corrected for spherical aberration, has resultant focal length of 10 cm. The separation...
- A body takes 10 minutes to cool from 60°C to 50°C. The temperature of surroundings is constant at 25°C. Then, the temperature of...
- When an air bubble of radius r rises from the bottom to the surface of a lake, its radius becomes 5r 4 . Taking the atmospheric...
- Muon ( ^ -1 ) is negatively charged (|q| = |e|) with a mass m_ = 200 ,m_e, where m_e is the mass of the electron and e is the...
- The value closest to the thermal velocity of a Helium atom at room temperature (300K) in ms^ -1 is - [k_B = 1.4 10^ -23 J/K; m_...
- In KO_2, the nature of oxygen species and the oxidation state of oxygen atom are, respectively :
- _fG° at 500 K for substance 'S' in liquid state and gaseous state are + 100.7 kcal mol^ -1 and + 103 kcal mol^ -1 , respectively....
- In XeO_3F_2, the number of bond pair (s), π-bond (s) and lone pair (s) on Xe atom respectively are -
- Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations. pH of which one of...
- Given (i) 2Fe_2O_3(s) → 4Fe(s) + 3O_2(g); _rG° = + 1487.0 kJ mol^ -1 (ii) 2CO(g) + O_2(g) → 2CO_2(g); _rG° = –514.4 kJ mol^ -1...
- At a certain temperature in a 5L vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium...
- The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn = 25, Co = 27, Ni = 28, Zn = 30)