Which of the following instruments is used to measure the time interval of race of an athlete? 

In 24 hour clock system, 6.15 a.m is represented as

A system used to measure mass, length and time is 

1 mean solar day = ______ seconds.

Which of the following are equal periods of time? 

3600 s = _____ hour. 

Siddhu left home at 4:30 p.m. to meet his friend. He came back after 3 hr. 25 min. At what time did he came back? 

10 years equal to ____ decade. 

1 tera metre =

1 nano metre =