According to many, including the Guinness Book of World Record,________is the world’s rarest mineral?

kilohertz (kHz) is a unit which measures?

A. Power used by a current of one ampere
B. Electromagnetic radio wave frequencies
C. Voltage
D. Electric resistance

What is unit of Pressure?

A. Barr
B. Torr
C. Pascal
D. All of these

Sound travels_______ in solid materials then liquid?A. Constant
B. Slowest
C. Fastest
D. None of these

 

The dominant phase of life cycle in these organism is haploid?

A. Mosses
B. Bacteria
C. Protozoa
D. None