81.

What is the name of the network topology in which there are bi-directional links between each possible node?

• Ring

• Star

• Tree

• Mesh

LAN stands for

• Local Area Nodes

• Large Area Network

• Large Area Nodes

• Local Area Network

Dry Ice is nothing but

• gaseous carbon dioxide

• washing soda

• solid carbon dioxide

• carbon monoxide

Which one of the following is obtained as slag in a blast furnace?

• Calcium Carbonate

• Calcium Sulphate

• Calcium Chloride

• Calcium Silicate

When H₂ gas is allowed to expand from a region of high pressure to a region of low pressure the temperature of the gas

• decrease to a small extent

• increases

• does not change

• decreases suddenly

In the industrial production of vegetable ghee, the process involved is

• dissociation

• reduction

• oxidation

• ionization

Which of the following weeds has been found useful to check water pollution caused by industrial affluents?

• Parthenium

• Elephant grass

• Water hyacinth

• (a) and (b)

In which year the Chernobyl Nuclear Power Plant of the former USSR had accident that caused escape of radio nuclides into atmosphere?

• 1979

• 1980

• 1984

• 1986

Certain desert lizard excrete their wastes in dry form. This serves as a means of

• protective mechanism against their predators

• limiting factor of the organism

• adaptation of the organization to the environment

• countering the problem of food scarcity

Which one is regarded as World heritage forest?

• Nandan Kanan in Odisha

• Kaziranga in Asom

• Sunderbans in Paschim Banga

• Indian Botanical Garden, Shibpur in Paschim Banga