A. Iron, silicon and nitrogen
B. Silicon, oxygen and aluminium
C. Iron, silicon and oxygen
D. Silicon, nitrogen and aluminium
A. Carbon dioxide
B. Mixture of the gases
C. Carbon monoxide
D. Carbon sulphite
A. Steps up the line voltage
B. Steps down the line voltage
C. Chokes low frequency currents
D. Reduces current in the circuit
A. Kills bacteria
B. Kills germs and spores
C. Absorbs all gases present inside the bottle
D. Reduces current in the circuit
A. Light waves
B. Microwaves
C. Radio waves
D. Sound waves
A. Milligram per decilitre
B. Millimeter of Hg
C. Parts per million
D. Grammes per litre
A. Hydrogen with oxygen
B. Methane with air
C. Oxygen with actylene
D. Carbon dioxide with ethane
A. Sodium acetate
B. Calcium oxalate
C. Magnesium sulphate
D. Calcium
A. A denser medium to a rarer medium
B. A rarer medium to a denser medium
C. A rarer medium to a denser medium and the angle of incidence is less than the critical angle
D. A rarer medium to a denser medium and the angle of incidence is greater than the critical angle