MCQ
The substance which allows heat radiations to pass through it is
  • A
    iron
  • B
    water vapour
  • C
    wood
  • dry air.

Answer

Correct option: D.
dry air.
dry air.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Electric Intensity due to a charged sphere at a point outside the sphere dectea.ses with
A straight wire carrying a current $(I)$ is turned into a circular loop. If the magnitude of the magnetic moment associated with it is ${ }^M M$, then the length of the wire will be
In a capillary tube having area of cross-section ' $A$ ', water rises to height ' $h$ '. If cross-sectional area is reduced to $\frac{A}{9}$, the rise of water in the capillary tube is
Fraunhofer diffraction pattern of a parallel beam of light (wavelength $\lambda$ ) passing through a narrow slit (width $a$ ) is observed on a screen using a convex lens (focal length $f$ ). The angular half-width of the central fringe is
 A parallel plate capacitor is charged and then isolated. The effect of increasing the plate separation on the charge, potential, capacitance respectively are
In Fresnel's biprism experiment, with the eyepiece $1 m$ from the two coherent sources, the fringe width obtained is $0.4 mm$. If just the eyepiece is moved towards the biprism by $25 cm$. then the fringe width
Two parallel conductors carrying unequal currents in the same direction _______
1000 small water drops of equal size combine to form a big drop. The ratio of final surface energy to the total initial surface energy is
A particle performs S.H.M. with amplitude $25 cm$ and period $3 s$. The minimum time required for it to move between two points $12.5 cm$ on either side of the mean position is
If an electron is brought towards another electron, the electric potential energy of the system ______