Hindi
Monday (29.2.16.) Study question answers of
Lesson -13 written in Hindi notebook for a review on Tuesday, 1.3.16.
Science
I.
Read and save the following content .
II.
Answer the questions that follow in your
science note book and submit the same on Wednesday, 2/3/16.
Satellites
Satellites are spaceships with no people in
them. Instead, scientists control them from
Earth. Most satellites have cameras or other
kinds of viewing equipment. There are two different kinds of satellites-
natural and artificial. Moon is the natural satellite that orbits earth. The
planet Saturn has 23 satellites, while Jupiter has 16. Pluto, like Earth, has
only one satellite. Man-made satellite performs very important functions in
areas of communication, defense, weather prediction, mapping, navigation,
research and space experiments. Scientists carefully follow their position and
give warnings about their re-entry behavior and location. The world's first
artificial satellite, the Sputnik 1, was launched by the Soviet Union in 1957. A
satellite named COBE shows a temperature map of the entire universe. Satellites
are used for a large number of purposes.
Common types include military and civilian
satellites, Earth observation satellites,
communications satellites, navigation
satellites, weather satellites, and research
satellites. Space stations and human
spacecraft in orbit are also satellites.
Space station
Scientist lives and work in space stations
for months at a time. The international space station (ISS) is made up of modules.
Some are laboratories and some are for living in.
The space shuttle
Rockets can only be used once but the space
shuttle flies back to earth at the end of each mission, and can be used again
and again.
Space probes
Robots spacecraft are called space probes.
They take photographs and use instruments to find out about planets and moons.
Q1. List any four functions of a man-made
satellite.
Q2. What is the function of the satellite
COBE ?
Q3. Name any 3 types of satellites.
Q4. Based on the discussion in class draw
the following
1.
International Space Station
2.
A space shuttle
3.
Space probe.
Q4. Why can rockets be used only once?
Q5. Why do we use space probes?
Q6. Why do scientists live in space stations?
