Apollo astronauts who stepped on the moon have kept some large mirrors there . Collect information about how the distance to the moon is measured using these .

Collect information about bimetallic strips and discuss in your class how a fire alarm is made using it .

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.

Project : Collect information about various physical quantities used in day-to-day life and the devices used for their measurement .

A survey was conducted to know the hobby of 220 students of class IX. Out of which 130 students informed about their hobby as rock climbing and 180 students informed about their hobby as sky watching. There are 110 students who follow both the hobbies. Then how many students do not have any of the two hobbies? How many of them follow the hobby of rock climbing only? How many students follow the hobby of sky watching only?

A survey was conducted to know the hobby of 220 students of class IX. Out of which 130 students informed about their hobby as rock climbing and 180 students informed about their hobby as sky watching. There are 110 students who follow both the hobbies. Then how many students do not have any of the two hobbies? How many of them follow the hobby of rock climbing only? How many students follow the hobby of sky watching only?