The correct answer is option 3 i.e. Acceleration.

• Acceleration refers to the rate at which velocity changes. An object accelerates when its velocity changes.
• Acceleration is a vector quantity. It has both magnitude and direction.
• The SI unit of acceleration is metre per second squared (ms^-2).

The correct answer is Option 3 i.e. Mechanical wave.

• Sound is a mechanical wave that transfers energy through the vibration of particles in a medium, such as air, water, or solids. These vibrations create longitudinal waves, where particles move back and forth in the direction of wave propagation.
• Sound cannot travel through a vacuum because it requires a medium to carry these vibrations. The frequency of these waves determines the pitch, and their amplitude determines the loudness.
• When sound waves reach our ears, they cause our eardrums to vibrate, allowing us to perceive sound as various tones and noises.
• Mechanical waves are those that propagate and transfer energy via matter.
• Sound waves are mechanical waves because they require a material medium to travel, such as air, liquids like water, or metals like silver.

The correct answer is option 1 i.e. It is the centre of a hollow sphere of which the spherical mirror is a part.

• Centre of curvature is the centre of the sphere of which the spherical mirror is a part.
• The point in the center of the sphere from which the mirror was sliced is known as the center of curvature and is denoted by the letter C in the diagram.
• This point is equidistant from all points on the reflecting surface of the mirror.

The correct answer is option 3 i.e. Ethyl ethanoate.

The formula CH₃COOCH₂CH₃ represents ethyl ethanoate.

Ethyl ethanoate is an ester with the structure derived from acetic acid and ethanol. In this compound, the acetyl group (CH₃COO-) is bonded to the ethyl group (CH₂CH₃). It is commonly used as a solvent in paints, coatings, and adhesives due to its pleasant smell and ability to dissolve many substances.

The correct answer is Option 2 i.e. Iodine solution.

Chemical testing for the presence of starch is often done using the iodine test.

When starch and iodine mix, a blue-black complex is formed. In biology and chemistry laboratories, this test is often used to determine whether starch is present in a variety of substances.

This process involves dipping the sample under test with a few drops of iodine solution.

If starch is present the color turning blue-black, indicating a positive result.

If starch is not present the solution retains its original color.

The correct answer is Option 2 i.e. Jacobus Henricus van't Hoff.

The Nobel Prize in 1901 for "recognition of the extraordinary services rendered by the discovery of the laws of chemical dynamics and osmotic pressure in solutions" was awarded to Jacobus Henricus van't Hoff. Van't Hoff's pioneering work laid the foundation for the fields of chemical dynamics and osmotic pressure, and he is celebrated for his contributions to physical chemistry and the development of chemical thermodynamics.

The correct answer is option 4 i.e. Anodizing.

The process in which a thick oxide layer of aluminum is developed over aluminum articles and then dyed to give an attractive finish is called anodizing. Anodizing involves immersing aluminum in an electrolytic solution and applying an electric current to form a durable and protective oxide layer on the surface. This oxide layer can be dyed in various colors, providing both enhanced aesthetic appeal and improved resistance to corrosion and wear. Anodizing is commonly used for architectural and decorative applications.

The correct answer is Option 2 i.e. Biotin.

The molecular name for vitamin B7 is "biotin."

Both in humans and other animals, biotin is engaged in a broad variety of metabolic processes, most of which are connected to the use of lipids, carbs, and amino acids.

One of the eight B vitamins is biotin.

It is sometimes referred to as vitamin B-7 or vitamin H, where the H stands for "Haar und Haut," which is German for "skin and hair."

Biotin dissolves in water.

Water-soluble vitamins must be absorbed from food because the body cannot store them.

The correct answer is Option 2 i.e. Acetic acid.

The chemical name of the acid present in vinegar is "acetic acid."

Acetic acid is an organic acid with the chemical formula CH₃COOH.

It is responsible for the sour taste and pungent smell of vinegar.

Vinegar is a dilute solution of acetic acid produced through the fermentation of ethanol by acetic acid bacteria.

Acetic acid is not only used in culinary applications but also has various industrial and chemical uses, including in the production of various chemicals and plastics.

The correct answer is option 1 i.e. Arsenic.

The element with atomic number 33 is "Arsenic."

Arsenic is a chemical element with the symbol "As" and is a metalloid, which means it has properties that are intermediate between metals and non-metals.

It is a naturally occurring element found in various minerals and ores and has both metallic and non-metallic uses.

Arsenic is known for its toxicity and is a hazardous substance in certain forms.

It is used in various industrial applications, including semiconductors, but its safety and handling are tightly regulated due to its toxic nature.