In Young's double slit experiment,the two slits act as coherent sources of equal amplitude $A$ and wavelength $\lambda$. In another experiment with the same setup,the two slits are sources of equal amplitude $A$ and wavelength $\lambda$,but are incoherent. The ratio of the intensity of light at the midpoint of the screen in the first case to that in the second case is:
- A$1 : 1$
- B$1 : 2$
- C$2 : 1$
- D$4 : 1$
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Match the columns.
Column-$I$ Column-$II$ $(a)$ Parturition $(p)$ Attachment of embryo to endometrium $(b)$ Gestation $(q)$ Release of egg from Graafian follicle $(c)$ Ovulation $(r)$ Delivery of Foetus from uterus $(d)$ Implantation $(s)$ Duration between pregnancy and birth $(t)$ Formation of zygote by fusion of egg and sperm
| Column-$I$ | Column-$II$ |
| $(a)$ Parturition | $(p)$ Attachment of embryo to endometrium |
| $(b)$ Gestation | $(q)$ Release of egg from Graafian follicle |
| $(c)$ Ovulation | $(r)$ Delivery of Foetus from uterus |
| $(d)$ Implantation | $(s)$ Duration between pregnancy and birth |
| $(t)$ Formation of zygote by fusion of egg and sperm |
Which of the following acids possesses oxidising,reducing,and complex-forming properties?
$\operatorname{cosec} 15^{\circ} + \sec 15^{\circ}$ is equal to :
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