Physics questions
20027 published questions with worked solutions.
- An ac source is connected to a capacitor C. Due to decrease in its operating frequency :
- 10 resistors, each of resistance R are connected in series to a battery of emf E and negligible internal resistance. Then those...
- Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The...
- A satellite is orbiting just above the surface of the earth with period T. If d is the density of the earth and G is the...
- Two thin lenses are of same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact...
- A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field B=(2 i+3 j-4 k) T. The...
- A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a...
- A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is :
- A radioactive nucleus ^ A _ Z X undergoes spontaneous decay in the sequence X B(Z-1) C(Z-3) D(Z-2), where Z is the atomic number...
- The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four...
- The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :
- A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance...
- A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V=V_0 t. The displacement current between...
- A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let S_n be the distance travelled by the...
- A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its...
- For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible...
- The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after...
- Match Column - I and Column - II and choose the correct match from the given choices. Column - I: (A) Root mean square speed of...
- Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the...
- A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :