Options:
- A. Radium dating
- B. Uranium dating
- C. Carbon dating
- D. Deuterium dating
View Answer
C. Carbon dating
Chemistry
Where does the oxygen that keeps us alive come from?
Options:
- A. Carbon dioxide
- B. Carbonates absorbed from soil
- C. Oxides of minerals
- D. Water
View Answer
D. Water
The radio-active element used in heart pacemakers is ___________?
Options:
- A. Uranium
- B. Deuterium
- C. Plutonium
- D. Radium
View Answer
C. Plutonium
Optic fibres are used in :
Options:
- A. CAT scans
- B. X-ray photos
- C. Ultrasound scans
- D. Endoscopy
View Answer
D. Endoscopy
The snow on the mountains does NOT melt all at once when it is heated by the sun because:
Options:
- A. it becomes very hard
- B. it reflects most of the heat from the sun
- C. it has a low specific heat capacity
- D. it has a high latent heat of fusion
View Answer
D. it has a high latent heat of fusion
The source of the Sun
Options:
- A. Photoelectric emission
- B. Nuclear fission
- C. Nuclear fusion
- D. Thermionic emission
View Answer
C. Nuclear fusion
When the radiation of light is passed through a prism, it undergoes __________?
Options:
- A. reflection
- B. interference
- C. diffraction
- D. refraction
View Answer
D. refraction
Main use of salt in diet is to : ___________?
Options:
- A. ease the process of cooking
- B. increase the taste
- C. produce small amount of hydrochloric acid required for digestion
- D. inclease solubility of food particles in water
View Answer
C. produce small amount of hydrochloric acid required for digestion
Petra means ______ ?
Options:
- A. Petrol
- B. Sediment
- C. Rock
- D. Fuel
View Answer
C. Rock
Black foot disease is caused by the pollution of groundwater as a consequence of increased seepage of:__________?
Options:
- A. Nitrates
- B. Fluorides
- C. Arsenic
- D. Mercury
View Answer
C. Arsenic