The structure which prevents the entry of food into the respiratory tract is

The vapour pressure in $mm$ of $Hg$,of an aqueous solution obtained by adding $18 \ g$ of glucose $(C_6H_{12}O_6)$ to $180 \ g$ of water at $100^{\circ} C$ is

Heat energy is incident on the surface at the rate of $1000 ~J/min$. If the coefficient of absorption is $0.8$ and the coefficient of reflection is $0.1$,then the heat energy transmitted by the surface in $5 ~min$ is: (in $~J$)

Match the Column-$I$ with Column-$II$ and select the correct option from the options given below:

Column-$I$ (Disease)	Column-$II$ (Pathogen)
$(A)$ Citrus canker	$(P)$ Protozoa
$(B)$ Malaria	$(Q)$ Fungi
$(C)$ Rust of wheat	$(R)$ Viroid
$(D)$ Bovine spongiform encephalopathy	$(S)$ Bacteria
-	$(T)$ Prions

If $\lambda_0$ is the de-Broglie wavelength for a proton accelerated through a potential difference of $100 \ V$,the de-Broglie wavelength for an $\alpha$-particle accelerated through the same potential difference is

Progesterone is secreted by .........