Physical Science

Q21.Which of the following increase the rate of chemical reaction:

Q22.Sulphur oxide and oxide of nitrogen causes:

Q23.What is the cause of acid rain?

Q24.Which type of energy is produced in a nuclear fission reaction?

Q25.__ is also known as laughing gas.

Q26.is the most malleable metal:

Q27.What is the first element in the periodic table?

Q28.Which of the following is not an element of credit Policy?

Q29.The most pollutant gas in earth's atmosphere ?

Q30.Which gas present in the Earth's atmosphere can absorb solar ultraviolet radiation?

Q31.The second most abundant metal found in the Earth's crust is

Q32.The gas commonly known as "Laughing gas " Co2 Sulphar Dioxide

Q33.Which element of the following is not essential for plants ?

Q34.Acid precipitation results from human modifications of:

Q35.When table salt NaCl is added to water?

Q36.Which element is used to remove the permanent hardness of water

Q37.Which element is used to remove the permanent hardness of water:

Q38.Heating element of an electric heater is made up of :

Q39.The removal of carbon dioxide urine and sweat is a process of ________?

Q40.which of the following gases' is used for refrigeration?