4391: The rainbow and the rainbow-like colours seen on a thin film of oil on a water surface are two phenomena. They are
(a) Similar in nature and both are due to refraction of light
(b) Different in nature and rainbow is due to interference of light, while colour of thin film is due to diffraction
(c) Similar in nature and both are due to interference of light
(d) Different in nature and rainbow is due to refraction, while colour of thin film is due to interference of light
4392: Recently, there has been a concern over the short supply of a group of elements called 'rare earth metals'. Why?
1. China, which is the largest producer of these elements, has imposed some restrictions on their export.
2. Other than China, Australia, Canada and Chile, these elements are not found in any country.
3. Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
4393: Which of the following was the first to escape out of solar system?
(a) Pioneer 10
(b) Voyager I
(c) Voyager II
(d) Soyuz
4394: In the context of bilateral trade negotiations between India and European Union, what is the difference between European Commission and European Council ?
1. European Commission represents the EU in trade negotiations whereas European Council participates in the legislation of matters pertaining to economic policies of the European Union.
2. European Commission comprises the Heads of State or government of member countries whereas the European Council comprises of the persons nominated by European Parliament.
Which of the statements given above is/are correct ?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
4395: Consider the following towns of India :
1. Bhadrachalam
2. Chanderi
3. Kancheepuram
4. Karnal
Which of the above are famous for the production of traditional sarees/fabric?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1, 2 and 3
(d) 1, 3 and 4