Questions

Integrity constraints are used to ensure accuracy and consistency of data in a relational database. Data integrity is handled in a relational database through the concept of referential integrity. Many types of integrity constraints play a role in referential integrity (RI).

Hence, Data integrity constraints are used to Improve the quality of data entered for a specific property i.e, table column.

The United Nations has marked the first World Tuna Day (WTD) on May 2, 2017 to conserve one of the globe’s most popular fish to be caught and eaten and to highlight the vital socio-economic importance of tuna to people around the world. Tuna plays a critical role in sustainable development, food security, economic opportunity, and livelihoods of people around the world. At present more than 80 States have tuna fisheries, thousands of tuna fishing vessels operate in all the oceans and tuna fishery capacity is still growing in the Indian and Pacific Oceans. The Day was designated in December 2016 resolution of the UN General Assembly.

The submerged portion of the ice on melting shrinks a little in volume. so the level of water goes down a little.But this is just made up by the water added by the melting of upper portion. Addition is equal to the Shrinkage. Hence level is unchanged.

Time does not depend on mass, else

T ∞ 1 + k2R2 

  k2R2=> is least for 'sphere' and

hence least time is taken by sphere.