In the earliest days when life originated on earth, the atmosphere contained : [UDC 1993]

Related MCQs

• Consider the following statements regarding the atmosphere of the earth: 1. It is enveloping the earth because of gravity. 2. Its density decreases with increasing height from the surface of the earth. 3. Its characteristic composition is same throughout its height. 4. Amount of pressure it exerts on earth's surface at sea level is called one atm sphere. Which of these statements are correct? [CDS 2001]
• Consider the following statements: 1. Nearly 99 percent of the total mass of the atmosphere lies within 30 km of the Earth's surface. 2. The proportion of ozone in the atmosphere increases to a maximum at about 60 km from Earth's surface. Which of the statements given above is/are correct? [IAS 2008]
• Which of the following are true regarding equinoxes? [CDS 1993] 1. They occur on March 21 st and September 23rd 2. They depict equal days and equal. nights on March 21 st and September 23rd on all places of the earth 3. All places on the earth have equal temperature during equinoxes
• Days and nights are caused by : 1. rotation of the earth on its axis 2. revolution of the earth around the sun 3. inclination of the earth's axis
• Consider the following statements: 1. Earth is the fourth largest planet of the solar system 2. Earth's circumference is about 45000 km 3. Earth's polar diameter is about 43 km shorter than its equatorial diameter 4. Earth has a total surface area of 510 million sq.km Which of these statements are correct? [NDA 2002]
• A layer in the Earth's atmosphere called Ionosphere facilitates radio communication. Why? 1. The presence of ozone causes the reflection of radio waves to Earth. 2. Radio waves have a very long wavelength. Which of the statements given above is fare correct? [CSAT 2011]
• Which of the following constituents of the atmosphere are important from the climatic point of view ? [IFS 1993] 1. Nitrogen 2. Oxygen 3. Carbon dioxide
• Variation in duration of day and night is due to: 1. rotation of earth on its axis 2. revolution of earth around the sun 3. inclination of earth at an angle of
• Which one of the following countries celebrates Christmas festival in summer season? [UDC 1994]
• Which of the planets is nearest to the earth? [Asstt Grade 1993]