Magnetism And Matter — Physics STD 12 Science — Question

A bar magnet is situated on a table along east-west direction in the magnetic field of earth. The number of neutral points, where the magnetic field is zero, are

(a) 2

(b) 0

(c) 1

(d) 4

The resistivity of a wire

(a) Increases with the length of the wire

(b) Decreases with the area of cross-section

(c) Decreases with the length and increases with the cross-section of wire

(d) None of the above statement is correct

In the circuit shown here, the readings of the ammeter and voltmeter are

(a) 6 A, 60 V

(b) 0.6 A, 6 V

(c) 6/11 A, 60/11 V

(d) 11/6 A, 11/60 V

In a laboratory experiment on emission from atomic hydrogen in a discharge tube, only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. This is because in a laboratory:

A region surrounding a stationary electric dipoles has:

The following truth table is for: ABY 110 101 011 001

In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is

(a) 1.0 mm

(b) 0.1 mm

(c) 0.05 mm

(d) 0.01 mm

On oscillating any metallic sphere in the magnetic field, its oscillatory motion is :

Two electric bulbs rated  watt V volts and   watt V volts are connected in parallel and V volts are applied to it. The total power will be    

(a)  watt

(b)  watt

(c)

(d)

The part of the spectrum of the electromagnetic radiation used to cook food is then: