Daily NEET MCQ- March 1, 2022 - NEET MCQ

Violet photon has more energy because the energy of a photon is given as:
E = hv
Since energy is directly proportional to wavelength, i.e. v_voilet > v_red, the violet photon is more energetic than the red photon.

Amines are classified as secondary or 2° when two of the hydrogen atoms of ammonia are replaced by an alkyl group and the third H remains attached as it is.

The edaphic abiotic factor is soil. Edaphic itself means related to soil. Soil is an important abiotic factor affecting the growth of plants. Soil provides support, minerals, and water to plants.

A photon transfers a part of its energy to the colliding electron, so its energy decreases, and consequently wavelength increases. This is because the energy of a photon is inversely proportional to the wavelength of a photon.

Amines may be classified as primary, secondary or tertiary depending on whether 1, 2 or 3 hydrogen atoms of NH3 are replaced by alkyl/aryl groups respectively. Quaternary ammonium compounds are a different class of compounds where all four hydrogen atoms of ammonium salts are replaced by alkyl/aryl groups.

The topographic abiotic factor is the Earth’s surface. It tells about the physical features of a surface or region. It contains geographic positions and elevations for both natural and man-made features.

Alkali metals have low work functions. Even visible radiation can eject out electrons from them. So alkali metals are the most suitable photo-sensitive metals.

The three groups attached to CH₃CH₂NHCH₃ are one methyl group, one ethyl group and one hydrogen atom. This means that two of the hydrogen atoms are replaced and hence, it is a 2° or secondary amine.

The hydrothermal sea vents are present at sea-floor. It includes geysers or hot springs present on the ocean floor which contains geothermally heated water. It has a temperature above 100°C which may rise up to 400°C.

Ultraviolet rays are most effective for photoelectric emission because they have the highest frequency when compared to the other electromagnetic waves, and hence the most energetic among all of them.