21. Which from the following is true for “Sound”?

A. Sound cannot travel through a vacuum

B. Sound cannot travel through gases

C. Sound cannot travel through liquids

D. Sound cannot travel through solids

22. When white light is passed through a prism, it splits into __________ colors.

A. 5
B. 6
C. 7
D. 8

23. 1 nanometer = ?

A. 10^-3meter

B. 10^-6meter

C. 10^-9meter

D. 10^-12meter

24. Instrument used for measuring very high temperature is __________?

A. Pyroscope

B. Pyrometer

C. Seismograph

D. Xylometer

25. Sound waves are _________ waves.

A. Transverse

B. Electromagnetic

C. Longitudinal

D. none of these

26. The lifespan of White Blood Cells is __________ day(s)?

A. 1 – 5 days
B. 3 – 7 days
C. 4 – 8 days
D. 5 – 21 days

27. The fluid part of blood is known as __________?

A. plasma

B. platelets

C. blood cells

D. None of these

28. During winter in cold countries, the __________ is mixed to melt the ice on the icy roads.

A. Salt
B. Chlorine
C. Carbon dioxide
D. Water

29. Which from the following is NOT a conductor?

A. Aluminium
B. Gold
C. Graphite
D. All are conductors

30. CNG stands for?

A. Converted Natural Gas
B. Conduced Natural Gas
C. Conducted Natural Gas
D. Compressed Natural Gas