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A. 0.5 second
B. 2 seconds
C. 1 second
D. 3 seconds
Answer
Answer
C. 1 second
Submitted by: Toheed Ahmed
Which one of the following represents a chemical change?
A. Heating of mercuric oxide powder
B. Sublimation of iodine
C. Heating a platinum wire in a bunsen flame
D. Evaporation of alcohol
Answer
Answer
A. Heating of mercuric oxide powder
Submitted by: Toheed Ahmed
Nitrogen is prepared in the laboratory by heating
A. Aluminium nitrate
B. Ammonium sulphate
C. The mixture of ammonium chloride and sodium nitrite
D. The mixture of ammonium chloride and calcium oxide
Answer
Answer
C. The mixture of ammonium chloride and sodium nitrite
Submitted by: Toheed Ahmed
The material used for bleaching paper pulp is
A. Sodium
B. Lime
C. Alum
D. Caustic soda
Answer
Answer
A. Sodium
Submitted by: Toheed Ahmed
Which of the following is a gas?
A. Chlorine
B. Plutonium
C. Thorium
D. Mercury
Answer
Answer
A. Chlorine
Submitted by: Toheed Ahmed
Dynamo is a device that converts
A. Mechanical energy into electrical energy
B. Electrical energy into mechanical energy
C. Alternating current into direct current
D. Heat energy into electrical energy
Answer
Answer
A. Mechanical energy into electrical energy
Submitted by: Toheed Ahmed
One horse power is equal to
A. 746 watts
B. 736 watts
C. 748 watts
D. 756 watts
Answer
Answer
A. 746 watts
Submitted by: Toheed Ahmed
Pure gold is _________?
A. 20 carat
B. 17 carat
C. 24 carat
D. 36 carat
Answer
Answer
C. 24 carat
Submitted by: Toheed Ahmed
Earth’s crust have the abundant reserves of
A. Iron, silicon and nitrogen
B. Silicon, oxygen and aluminium
C. Iron, silicon and oxygen
D. Silicon, nitrogen and aluminium
Answer
Answer
B. Silicon, oxygen and aluminium
Submitted by: Toheed Ahmed
Which of the following is used in fire extinguishers?
A. Carbon dioxide
B. Mixture of the gases
C. Carbon monoxide
D. Carbon sulphite
Answer
Answer
A. Carbon dioxide
Submitted by: Toheed Ahmed