Science Quiz 5

1. Cepheids : Giant clouds of dust and gas in space 
2. Nebulae : Stars which brighten and dim periodically 
3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse 

How many of the above pairs are correctly matched?

1. GPS and navigation systems could fail. 
2. Tsunamis could occur at equatorial regions. 
3. Power grids could be damaged. 
4. Intense auroras could occur over much of the Earth. 
5. Forest fires could take place over much of the planet. 
6. Orbits of the satellites could be disturbed. 
7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted. 

Select the correct answer using the code given below:

1. Chlorophyll content in the vegetation of a specific location 
2. Greenhouse gas emissions from rice paddies of a specific location 
3. Land surface temperatures of a specific location

1. The Earth’s magnetic field has reversed every few hundred thousand years. 
2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide. 
3. When living organisms originated, they modified the early atmosphere of the Earth. 

Which of the statements given above is/are correct?

1. IRNSS has three satellites in geostationary and four satellites in geosynchronous orbits. 
2. Geosynchronous covers entire India and about 5500 sq. Km beyond its border. 
3. India will have its own satellite navigation system with full global coverage by the middle of 2019. 

Which of the following statements given above is/are correct?