2nd Year Physics Chapter 9 TestSPACE AND ENVIRONMENT

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. An increase in the wavelength of spectral lines from distant stars and galaxies compared to their laboratory values is called:

   1. Blueshift

   2. Redshift

   3. Absorption spectrum

   4. Blackbody radiation

2. What technology uses sensors aboard orbiting spacecraft to monitor Earth's environment from space?

   1. Thermohaline circulation

   2. Satellite remote sensing

   3. Ground-based seismology

   4. Anemometry

3. Which combination of properties makes water the heaviest and most dense?

   1. Warm and less salty water

   2. Warm and highly salty water

   3. Cold and less salty water

   4. Cold and highly salty water

4. A negative change in wavelength represents a blue shift, which shows that the celestial object is:

   1. Moving away from Earth

   2. Approaching the Earth

   3. Expanding in size

   4. Stationary

5. What is the SI unit of radiant flux intensity?

   1. Watt

   2. Joule per second

   3. Watt per square metre

   4. Newton per metre

6. Approximately how much of the Sun's incoming energy does the Earth absorb?

   1. 30%

   2. 50%

   3. 70%

   4. 99%

7. Which of the following is a human activity that influences climate change?

   1. Burning fossil fuels

   2. Ocean currents

   3. Solar radiation

   4. Volcano eruptions

8. Which of the following is not one of the five interacting of Earth's components climate system?

   1. Atmosphere

   2. Lithosphere

   3. Magnetosphere

   4. Cryosphere

9. Which equation correctly represents the Stefan-Boltzmann law?

   1. 

   2. 

   3. 

   4. 

10. The luminosity of a star can be calculated initially by using its:

    1. Shape and mass

    2. Wavelength shift

    3. Radiant flux intensity

    4. Gravitational force