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1.

In the circuit diagram shown A. time constant is L/RB. time constant is 2L/RC. steady state current in inductor is `2epsilon//R`D. steady state current in inductor is `epsilon//2R`

Answer» Correct Answer - A
Discussion
2.

Which of the following is (are) correct.A. The image and object are never on opposite side of focus in a spherical mirrorB. A virtual image must be erectC. An image formed in a plane mirror must have same speed as the object hasD. Laws of reflection are not same for all wave lengths

Answer» Correct Answer - A
Discussion
3.

The escape velocity of a sphere of mass `m` is given byA. `sqrt((2GM)/R)`B. `2sqrt((GM)/R)`C. `sqrt((2GMm)/R)`D. `sqrt((GM)/R)`

Answer» Correct Answer - A
Discussion
4.

The electric intesity E, current density j and conductivity `sigma` are related as:A. `J=E//sigma`B. `J=sigma//E`C. `J=sigma^(2)E`D. `E=sigma^(2)J`

Answer» Correct Answer - B
Discussion
5.

An electron is revolving around a proton. The total work done in one revolution by electric force on the electron will be zero if the trajectory of the electron isA. circulary onlyB. elliptical onlyC. any closed curveD. not posssible

Answer» Correct Answer - C
Discussion