The cathode of a lead storage battery made up of:
- (A) Zinc
- (B) Lead
- (C) Lead oxide
- (D) Manganese dioxide
- (B) Lead
Which one of the following metals is found in plaster of Paris?
- (A) Sodium
- (B) Calcium
- (C) Magnesium
- (D) Potassium
- (B) Calcium
When a lead storage battery is discharged, _______ is consumed.
- (A) Lead sulphate
- (B) Calcium nitrate
- (C) Sulphuric acid
- (D) Lead peroxide
- (C) Sulphuric acid
The “Silicon carbide” is used for:
- (A) Making cement and glass
- (B) Cutting very hard substances
- (C) Disinfecting water of ponds
- (D) Makin casts for statues
- (B) Cutting very hard substances
Which is the least conductor of electricity among the following?
- (A) Silver
- (B) Iron
- (C) Copper
- (D) Wood
- (D) Wood
Which one of the following does not contain silver?
- (A) Ruby silver
- (B) German silver
- (C) Horn silver
- (D) Lunar silver
- (B) German silver
German silver is an alloy which contains all of the following EXCEPT:
- (A) Nickel
- (B) Silver
- (C) Zinc
- (D) Copper
- (B) Silver
Sui gas has what percent of Methane?
- (A) 51%
- (B) 65%
- (C) 80%
- (D) 90%
- (D) 90%
The water is chemically a compound of the following two gases:
- (A) Hydrogen and Nitrogen
- (B) Oxygen and Ammonia
- (C) Nitrogen and Carbon
- (D) Hydrogen and Oxygen
- (D) Hydrogen and Oxygen
Which compound protects teeth from diseases?
- (A) Fluorine
- (B) Iodine
- (C) Chloride
- (D) Bromine
- (A) Fluorine
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