Nuclei — Physics STD 12 Science — Question

Assertion :   The capacity of a given conductor remains same even if charge is varied on it.
Reason      : Capacitance depends upon nearly medium as well as size and shape of conductor.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be(a) 200(b) 100(c) 50       (d) 20

Which of the following theories is the most satisfactory about the origin of the universe (a) Big Bang theory (b) Pulsating theory(c) Steady state theory (d)  None of these

Two particle of mass m and 2m moving in opposite direction collide head on. They have same de-Broglie wavelength before collision after the collision.

In an LCR circuit the potential difference between the terminal of the inductance is 60V, between the terminals of the capacitor is 30V and that between the terminals of the resistance is 40V. The supply voltage will be equal to:

Suppose potential energy between electron and proton at separation r is given by U = K ln (r), where K is a constant. For such a hypothetical hydrogen atom, the ratio of energy difference between energy levels (n = 1 and n = 2) and (n = 2 and n = 4) is?

In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light (a) 5000 Å(b) 6000 Å(c) 7000 Å(d) 9000 Å

A particle moves in a region having a uniform magnetic field and a parallel, uniform electric field. At some instant, the velocity of the particle is perpendicular to the field direction. The path of the particle will be:

1. A straight line.
2. A circle.
3. A helix with uniform pitch.
4. A helix with nonuniform pitch.