Questions

Masses of stars and galaxies are usually expressed in terms of

Improve the bracketed part of the sentence.

The state has (declined negotiate) any more trade-offs on this proposal or accept calls for stringent transparency requirements.

Read the passage carefully and choose the best answer to each question out of the four alternatives.

Genetic variation is the cornerstone of evolution, without which there can be no natural selection, and so a low genetic diversity decreases the ability of a species to survive and reproduce, explains lead author Yoshan Moodley, Professor at the Department of Zoology, University of Venda in South Africa.

Two centuries ago, the black rhinoceros – which roamed much of sub Saharan Africa – had 64 different genetic lineages; but today only 20 of these lineages remain, says the paper. The species is now restricted to five countries, South Africa, Namibia, Kenya, Zimbabwe and Tanzania. Genetically unique populations that once existed in Nigeria, Cameroon, Chad, Eritrea, Ethiopia, Somalia, Mozambique, Malawi and Angola have disappeared. The origins of the 'genetic erosion' coincided with colonial rule in Africa and the popularity of big game hunting. From the second half of the 20th century, however, poaching for horns has dramatically depleted their population and genetic diversity, especially in Kenya and Tanzania.

From the second half of the 20th century what has caused a dramatic fall in black rhinoceros population?

In nuclear reactor,Chain reaction is controlled by introducing

Which statements are CORRECT?

I. In early 1930’s Nylon was prepared from coal, water and air.

II. Nylon was the first fully synthetic fibre.

III. Nylon fibre was strong, elastic and light.

Which of the following statement(s) is/are INCORRECT?

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

The base of an electric iron is brightly polished mainly

Improve the bracketed part of the sentence.

Perhaps a greater challenge they face is (improving the wounds of the civil war), Iraq is a divided country today.