Explanation

 Angular momentum (L) is defined as the cross product of the position vector (r) of a particle with its linear momentum (p) relative to a chosen origin. 

Explanation

Ans:

Hydroponics:

• Hydroponics is a sort of horticulture and a subset of hydroculture which entails growing flowers,
• typically vegetation, with out soil, by way of using mineral nutrient answers in an aqueous solvent. Terrestrial or aquatic flora might also grow with their roots uncovered to the nutritious liquid, or, further, the roots may be bodily supported via an inert medium inclusive of perlite, gravely or different substrates.
• not with standing inert media, roots can motive modifications of the rhizosphere pH and root exudates can have an effect on rhizosphere biology and physiological balance of the nutrient solution with the aid of secondary metabolites.

Explanation

 Electric lines of force are always diverging from positive charge and they converge at a negative charge.

Explanation

The pH of a mixture of CH₃COONa (sodium acetate) and CH₃COOH (acetic acid) is C. <7. 

This mixture forms a buffer solution, where the weak acid (CH₃COOH)

Its conjugate base (CH₃COO-) is present together, resulting in a pH that is less than 7 (acidic) but not extremely so

Explanation

The smallest planet in terms of mass and volume is Mercury. With a diameter of 4,879 km  and 3.3010 x 1023 kg, this small world weighs about one-twentieth the mass of the Earth and  is about one-2.5th the diameter. In fact, Mercury is closer  to our moon than  Earth.

Explanation

Answer:

C

two hundred calories

A cup of white rice has approximately two hundred calories now no longer insignificant, thinking about it`s most customarily used as a small part of a bigger dish.

Explanation

The human brain weighs approximately about 1.4 kilograms or 1400 in gram

and makes up about 2% of the human body weight.

The brain is divided into three regions -

Forebrain,

midbrain, 

hindbrain.

Explanation

Meteorology means علم موسمیات

Meteorology is the scientific study of weather and atmospheric conditions.

It involves forecasting and understanding climate patterns.

Explanation

A piece of steel sinks in water because steel is denser than water. However, a steel ship is a hollow object made of steel and contains a lot of air in it.

Due to presence of a lot of air in it, the average density of the ship becomes less than the density of water. Hence a ship floats in water.

Explanation

Answer:

B

AIDS results from the disruption of the immune system caused by HIV infecting and destroying a special group of white blood cells called helpers for T4 cells. And with the collapse of the immune system, severe opportunistic infections. today, more than 1.2 million people are living with HIV in the U.S. and there are more than 35,000 new infections each year.