Practice questions
88551 published questions with worked solutions.
- A closed organ pipe has a fundamental frequency of 1.5 kHz. The number of overtones that can be distinctly heard by a person with...
- A metal plate of area 1 10^ -4 m^2 is illuminated by a radiation of intensity 16 mW/m^2. The work function of the metal is 5 eV....
- A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power when an ideal power...
- Two stars of masses 3 10^ 31 kg each, and at distance 2 10^ 11 m rotate in a plane about their common centre of mass O. A...
- At some location on earth the horizontal component of earth's magnetic field is 18 10^ -6 T. At this location, magnetic needle of...Not in JEE Advanced syllabus
- The self induced emf of a coil is 25 volts. When the current in it is changed at uniform rate from 10 A to 25 A in 1 s, the...
- Half mole of an ideal monoatomic gas is heated at constant pressure of 1 atm from 20°C to 90°C. Work done by gas is close to:...
- The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches...Not in JEE or NEET syllabus
- The electric field of a plane polarized electromagnetic wave in free space at time t = 0 is given by an expression E(x, y) = 10 j...
- Two forces P and Q, of magnitude 2F and 3F, respectively, are at an angle θ with each other. If the force Q is doubled, then...
- The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of cornea (7.8...
- A hoop and a solid cylinder of same mass and radius are made of a permanent magnetic material with their magnetic moment parallel...
- An unknown metal of mass 192 g heated to a temperature of 100°C was immersed into a brass calorimeter of mass 128 g containing...
- A particle which is experiencing a force, given by F = 3 i - 12 j, undergoes a displacement of d = 4 i. If particle had a kinetic...
- A particle executes simple harmonic motion with an amplitude of 5 cm. When the particle is at 4 cm from the mean position, the...
- A parallel plate capacitor having capacitance 12 pF is charged by a battery to a potential difference of 10 V between its plates....
- A reaction of cobalt(III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A (violet coloured)...
- The pair that contains two P–H bonds in each of the oxoacids is:
- In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO_2...
- The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is: