Current Electricity — Physics STD 12 Science — Question

Two resistances of 400 W and  800 W are connected in series with 6 volt battery of negligible internal resistance.  A voltmeter of resistance 10,000 W is used to measure the potential difference across 400 W.  The error in the measurement of potential difference in volts approximately is

(a) 0.01

(b) 0.02

(c) 0.03

(d) 0.05

A galvanometer whose resistance is  120 Ω gives full scale deflection with a current of 0.05 A so that it can read a maximum current of 10 A. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is

(a) 0.06 Ω

(b) 0.006 Ω

(c) 0.6 Ω

(d) 6 Ω s

The magnetic induction in the region between the pole faces of an electromagnet is 0.7 weber/m². The induced e.m.f. in a straight conductor 10 cm long, perpendicular to B and moving perpendicular both to magnetic induction and its own length with a velocity 2 m/sec is

(a) 0.08 V

(b) 0.14 V

(c) 0.35 V

(d) 0.07 V

An electron and a proton are at a distance of 1. The moment of this dipole will be (C  X m)

(a) 1.6

(b) 1.6

(c) 3.2

(d) 3.2

For a crystal system, a = b = c, a = b = g  ¹ 90^o, the system is

(a) Tetragonal system	(b) Cubic system
(c) Orthorhombic system	(d) Rhombohedral system

For the ground state, the electron in the H-atom has an angular momentum = h, according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbits with the vector pointing in all possible directions. In actuality, this is not true,

In a nuclear fission reaction

(a) Two light nuclei combine to produce a heavier nucleus

(b) A light nucleus bombarded by thermal neutrons breaks up

(c) A heavy nucleus bombarded by thermal neutrons breaks up

(d) A heavy nucleus breaks up by itself

An electron is moving with constant velocity along x - axis. If a uniform electric field is applied along y- axis, then its path in the x - y  plane will be   

(a) A straight line

(b) A circle

(c) A parabola

(d) An ellipse

The binding energy per nucleon of iron atom is approximately.