A positively charged particle emitted by a radioactive element is:
- (A) Alpha ray
- (B) Beta ray
- (C) Gamma ray
- (D) Cathode ray
- (A) Alpha ray
What does the soda water contain?
- (A) Carbonic acid
- (B) Nitrous acid
- (C) Sulphuric acid
- (D) Carbon dioxide
- (A) Carbonic acid
The gases which are by divers as an artificial atmosphere are oxygen and:
- (A) Neon
- (B) Helium
- (C) Hydrogen
- (D) Nitrogen
- (B) Helium
The “Potassium nitrate” is used in:
- (A) Salt
- (B) Glass
- (C) Medicine
- (D) Fertilizer
- (D) Fertilizer
Which one of the following is the softest?
- (A) Calcium
- (B) Iron
- (C) Lithium
- (D) Aluminum
- (B) Iron
The heaviest naturally occurring element is:
- (A) Mercury
- (B) Uranium
- (C) Thorium
- (D) Polonium
- (B) Uranium
When a gas turned into a liquid the process is known as:
- (A) Sublimation
- (B) Deposition
- (C) Evaporation
- (D) Condensation
- (D) Condensation
Process of burning under presence of oxygen is known as:
- (A) Respiration
- (B) Combustion
- (C) Cracking
- (D) Sublimation
- (B) Combustion
Combustion cannot take place without:
- (A) Lead
- (B) Carbon
- (C) Air
- (D) Zinc
- (C) Air
For a fixed mass of gas at constant temperature, if we decrease volume, pressure will:
- (A) Decrease
- (B) Increase
- (C) Remain constant
- (D) Fluctuates
- (B) Increase
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