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A dissecting aortic aneurysm occurs when the inner layers of the aorta become separated.

The Doppler effect or Doppler shift is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. 

In a spreadsheet program, when a data is changed all calculations are recalculated.

A Union territory is a type of administrative division in India. Unlike the other states which have their own state governments, union territories are ruled by the central government. There are 7 union territories in India. They are ::

• National Capital Territory of Delhi – Delhi.

• Chandigarh – Chandigarh.

• Daman and Diu – Daman.

• Dadra and Nagar Haveli – Silvassa.

• Pondicherry – Puducherry.

• Andaman and Nicobar Islands – Port Blair.

• Lakshadweep – Kavaratti.

Geography is a field of science related to the study of the lands, places, relation between people & their environments. Geography can be understood in terms of five different themes. They are :

• Location
• Place
• Human-Environment Interaction (HEI)
• Movement
• Region.

A monopoly is a market that has a single seller of a unique product in the market. He does not have any competition in the market as he has no substitute product for the product he is selling.

Cost variance is nothing but the difference between the actual incurred cost and the estimated standard cost. This can be occured due to any changes in the volume of goods or services ordered. 

A favorable cost variance occurs when the actual incurred cost is less than the standard cost estimated before the production.

An eclipse happens when a planet or a moon gets in the way of the sun's light. Our planet Earth experiances two types of eclipses. They are Solar and Lunar eclipses.

Solar Eclipse : This occurs when The Sun, the Moon and the Earth are in a straight line. The moon being in middle blocks sun rays falling on the Earth.

Lunar Eclipse : The Sun, the Earth and the Moon are in a straight line. The Earth being in middle and moon in the shadow of Earth behind it.