Explanation

Kinetic energy (KE) is expressed as: 

KE = 1/2 * mv² 

Where: m = mass (dimensions: M¹), v = velocity (dimensions: L¹T⁻¹), and v² = (L¹T⁻¹)² = L²T⁻². 

Therefore, the dimensions of KE are: 

KE = M¹ * (L²T⁻²) = M¹L²T⁻² 

Explanation

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere

Ozone protects us from the harmful ultraviolet radiation of the sun.

Ozone formula: O3

The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.

The ozone layer is depleting: Air pollution

ND17-7-2023

Explanation

The energy stored in coal is classified as chemical energy.

It is released during combustion when the chemical bonds in the coal are broken.

This energy is harnessed for heating and electricity generation.

Explanation

The stratosphere is the second layer of Earth's atmosphere as you go upwards, lying above the troposphere and below the mesosphere.

The layers of the Earth's atmosphere, in order from the surface, are:

1. Troposphere (up to about 12 km/7.5 miles)
2. Stratosphere (up to about 50 km/31 miles)
3. Mesosphere (up to about 85 km/53 miles)
4. Thermosphere (up to about 600 km/373 miles)

Explanation

Elements are placed in order on the periodic table based on their atomic number, how many protons they have.

In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

Explanation

Lactometer is used for milk

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A lactometer is an instrument that is used to check for the purity of milk by measuring its density.

 lactometer works on the principle of gravity of milk.

Explanation

Explanation

The process of artificial rain is called cloud seeding.

It involves dispersing substances into the atmosphere to encourage precipitation from clouds.

Explanation

Cubic is a measure of flow rate.

Cusec is the short form for cubic meter per seconds/cubic feet per seconds.

Cusec is generally used to measure the flow rate.

1 Cusec is equal to 28.317 litres.

Explanation

1 centimeter = 0.01 meter, which is 1/100 of a meter.

It is a standard unit of length in the metric system.