What method of energy transfer requires no medium for transfer?

A. 31
B. 32
C. 33
D. 34

Which one is the brightest star in the night sky?

A. Betelgeuse
B. Sirius
C. Rigel
D. Polaris

A. 30
B. 40
C. 50
D. 32

A. Phosphorus
B. Antimony
C. Arsenic
D. Aluminum

Copper can be converted into gold by ?

A. Artificial radioactivity
B. heating
C. Electroplating
D. Chemical reaction

A. 0.03 to 0.04% CO2
B. 0.3 to 0.4% CO2
C. 3 to 4% CO2
D. None of these