Simple Harmonic Motion — Physics STD 12 Science — Question

Consider the process on a system shown in figure. During the process, the work done by the system:

1. Continuously increases.
2. Continuously decreases.
3. First increases then decreases.
4. First decreases then increases.

Magnetic dipole moment is a vector quantity directed from:

Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is

(a) 5 : 2

(b) 7 : 3

(c) 49 : 9

(d) 9 : 49

Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90^o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio

(a) 0 : 1 : 4

(b) 4 : 1 : 0

(c) 0 : 1 : 2

(d) 2 : 1 : 0

Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is

(a) a/b

(b) b/a

(c)

(d)

Avalanche breakdown is due to

(a) Collision of minority charge carrier	(b) Increase in depletion layer thickness
(c) Decrease in depletion layer thickness	(d) None of these

Mark the correct options:

Particle like behavior of light arises from the fact that each quanta of light has definite ...X... and a fixed value of ...Y.. just like a particle, Here, X and Y refer to?

Magnetic moments of two bar magnets may be compared with the help of

(a)  Deflection magnetometer	(b) Vibration magnetometer
(c) Both of the above	(d) None of the above

Making a light wave vibrate in only one plane is known as: