Magnetism And Matter — Physics STD 12 Science — Question

Figure shows a horizontal solenoid connected to a battery and a switch. A copper ring is placed on a frictionless track, the axis of the ring being along the axis of the solenoid. As the switch is closed, the ring will:

Heavy stable nucle have more neutrons than protons. This is because of the fact that:

The electrical circuits used to get smooth d.c. output from a rectifier circuit is called

(a) Filter

(b) Amplifier

(c) Full wave rectifier

(d) Oscillator

If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be

(a)

(b)

(c)

(d)

In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is

(a) 0.5 Ω

(b) 0.6 Ω

(c) 1.2 Ω

(d) 1.5 Ω

What is the reading of voltmeter in the following figure

(a) 3 V

(b) 2 V

(c) 5 V

(d) 4 V

A glass lens is placed in a medium in which it is found to behave like a glass plate. Refractive index of the medium will be

(a) Greater than the refractive index of glass

(b) Smaller than the refractive index of glass

(c) Equal to refractive index of glass

(d) No case will be possible from above

The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then

(a) X and Y have the same decay rate initially

(b) X and Y decay at the same rate always

(c) Y will decay at a faster rate than X

(d) X will decay at a faster rate than Y

When a current in a circular loop is equivalently replaced by a magnetic dipole: