Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

In an induction coil, the secondary e.m.f. is(a) Zero during break of the circuit(b) Very high during make of the circuit(c) Zero during make of the circuit(d) Very high during break of the circuit

In the given figure, if the Wheatstone bridge is in balanced condition, then the value of resistance 'S' will be

Which one of the following is the weakest kind of bonding in solids(a) Ionic  (b) Metallic(c) Vander Waals(d) Covalent

The Bohr radius of the fifth electron of phosphorus (atomic number = 15) acting as dopant in silicon (relative dielectric constant = 12) is(a) 10.6 Å(b) 0.53 Å(c) 21.2 Å                                           (d) None of these

A long, straight wire carries a current along the z-axis, One can find two points in the x−yplane such that:

A square loop of side 22 cm is converted into circular loop of 0.45. If uniform magnetic field of 0.2 T is perpendicular to the loop, then induced electromotive force in the loop is:

When objects at different distances are seen by the eye, which of the following remains constant(a) The focal length of the eye lens(b) The object distance from the eye lens(c) The radii of curvature of the eye lens(d) The image distance from the eye lens

The ratio of speed of an electron in ground state in Bohrs first orbit of hydrogen atom to velocity of light in air is

If the temperature of cold junction of thermocouple is lowered, then the neutral temperature(a) Increases(b) Approaches inversion temperature(c) Decreases(d) Remains the same