1841: Consider the following statements :
Chlorofluorocarbons, known as ozone-depleting substances, are used
1. in the production of plastic foams
2. in the production of tubeless tyres
3. in cleaning certain electronic components
4. as pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
(a) 1, 2 and 3 only
(b) 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4
1842: Which one of the following pairs is not correctly matched?
Current Name : Old Name
(a) Harare : Salisbury
(b) Ethiopia : Abyssinia
(c) Ghana : Dutch Guiana
(d) Kinshasa : Leopoldville
1843: Who among the following scientists shared the Nobel Prize in Physics with his son?
(a) William Henry Bragg
(b) Enrico Fermi
(c) Max Planck
(d) Albert Einstein
1844: Which one of the following figures will generate a cone when rotated about one of its straight edges ?
(a) An equilateral triangle
(b) A sector of a circle
(c) A segment of a circle
(d) A right-angled triangle
1845: What is 'Greased Lightning-10 (GL-10)', recently in the news?
(a) Electric plane tested by NASA
(b) Solar-powered two-seater aircraft designed by Japan
(c) Space observatory launched by China
(d) Reusable rocket designed by ISRO