Explanation

Brewster’s angle is the angle of incidence at which light with a particular polarization is perfectly transmitted through a surface with no reflection.

At this angle, the reflected and refracted rays are perpendicular (90° apart).

Explanation

The speed of sound in a gas is proportional to the square root of temperature (in Kelvin):

v ∝ √T

If the temperature becomes 16 times, then:

New speed = √16 × original speed = 4 × original speed

Explanation

The two unpaired facial bones are the mandible and the vomer.

Mandible:

The mandible, commonly known as the jawbone, is the largest and strongest bone of the face.

It forms the lower jaw and holds the lower teeth in place.

It is the only movable bone of the skull.

Vomer:

The vomer is a thin, flat bone that forms part of the nasal septum, which divides the nasal cavity into left and right sides.

It is located inferiorly within the nasal cavity.

Explanation

The false statement regarding Hepatitis A virus is Causes chronic liver disease. 

 Hepatitis A is typically a mild, self-limiting illness that does not lead to chronic liver disease unlike hepatitis B and C. 

Explanation

The tertiary structure of a protein refers to its complex, folded shape in 3D space, which is crucial for enzyme function.

This structure is formed by interactions between the amino acid side chains within the polypeptide chain,

Including hydrophobic interactions, ionic bonds, hydrogen bonds, and disulfide bridges

Explanation

Acidified potassium permanganate (KMnO4), acidified potassium dichromate (K2Cr2O7), and silver nitrate (AgNO3 (in the form of Tollens' reagent) can all oxidize aldehydes to carboxylic acids. 

Acidified KMnO4:

• A strong oxidizing agent that readily converts aldehydes to carboxylic acids.
• It changes color from purple to colorless during the reaction. 

Acidified K2Cr2O7:

• Also a strong oxidizing agent that can oxidize aldehydes to carboxylic acids.
• It changes color from orange to green during the reaction. 

AgNO3 (in Tollens' reagent):

• A milder oxidizing agent compared to the previous two, but still capable of oxidizing aldehydes.
• It gives a characteristic silver mirror precipitate when reacting with an aldehyde. 

Explanation

Weight depends on the gravitational force, which decreases with altitude.

As the person moves away from the Earth's surface, gravity slightly weakens, so their weight becomes less than 600 N.

Explanation

- Capacitance with dielectric: C = εr · C₀, where C₀ is the capacitance without dielectric.

- If the dielectric is removed, capacitance becomes C₀ = C / εr. 

So, the new capacitance is C divided by εr.

Explanation

The pancreas is a unique organ that functions as both an exocrine and endocrine gland.

The exocrine portion produces digestive enzymes that are released into the duodenum through ducts.

The endocrine portion, called the islets of Langerhans, produces hormones like insulin and glucagon, which are released directly into the bloodstream to regulate blood sugar levels. 

Explanation

 Angle in radians (θ) = Arc Length / Radius  

θ = 4 m / 2 m = 2 radians

So, the angle made at the center is 2 rad