The broadcast signals that originate from a radio station are sent to an artificial satellite for redistribution to other locations. Name the orbit where such satellites should be placed and the launch vehicle used.

Describe how an artificial satellite using two stage rocket is launched in an orbit around the Earth.

What is the range from the Earth's surface ,where an artificial satellite, to detect a precise latitude and longitude of a place, should revolve?

Identify and write the soncept upon which a given statement is based upon (b) Scientists want to laiunch a geosynchronous satellite. Name the orbit into which it should be launched.

Identify and write the soncept upon which a given statement is based upon (c) Name the vehicle with the help of which the satellites are placed in their specific orbits.

Read the following paragraph and answer the following questions given below it : Construction of a compound microscope : (i) Acompound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens ( the lens directed towards the object ) and the eyepiece ( the lens directed towards the eye ). Both the lenses are small in size , but the cross section of the objective lens has a short focal length . the focal length of the eyepiece is more than that of the objective lens . (ii) The metal tube is mounted on a stand . thr principal axes of the objective lens and the eyepiece are along the same line . The distance between the object and objective lens can be changed with a screw . It is possible to change the distance between the objective lens and the eyepiece. Working : (i) The object to be observed is illuminated and placed in front of the objective lens. slightly beyond the focal length of the objective lens. it's real , inverted and enlarged image is formed by the objective lens on the other side. (ii) This intermediate image lies with in the focal length of the eyepiece. It serves as an object for the eyepiece. The eyepiece works as a simple microscope . the final image is virtual, highly enlarged and inverted with respect to the original object . It can be formed at the minimum distance of distinct vision from the eyepiece . The final image is observed by keeping the eye close to the eyepiece. Use: This microscope is used to observe blood cells , microorganisms , etc. Where do you place the object to be observed with a compound microscope ?

Select proper alternative and complete the following paragraph. (NASA, ISRO, Apollo-2, Stones , manned Luna 2 , ummanned , Chandrayaan-1 , USA, Soviet Union , India) The spacerafts in the Luna series sent by ……….. reached near the moon. ............ , launched in 1959 was first craft in this series . Till 1975, 15 spacecrafts were sent to moon, which made chemical analysis of the moon and also measured its gravity , density and radiations. Last four crafts even landed on the moon and brought the samples of ................. from the surface of the moon for analysis in the laboratories . America also executed moon missions in the duration of 1962 to 1972 . The speciality of these missions was that some of these were .......... missions . In July ,1969 , Neil Armstrong become the first human to step on the moon. In 2008 , ........... launched ............ and placed it into an orbit around the moon . It obtained useful information of moon for about a year.

If a satellite has to orbit the earth in a circular path every 6 hrs, what distance from the surface of the earth should the satellite be placed? (Radius of earth=6400 km) (Assume (GM/(4pi^2)) = 8xx10^12 Nm^2/kg , where G and M are gravitational constant and mass of the earth and 10^(1/3)=2.1 )