Q.1:- In deep-sea diving, divers use a mixture of gases consisting of Oxygen and ?
- Hydrogen
- Nitrogen
- Argon
- Helium
Q.2:- Which one of the following group of gases contribute to the “Green House Effect” ?
- Carbon Dioxide and Methane
- Ammonia and Ozone
- Carbon Monoxide and Sulphur Dioxide
- Carbon Tetraflouride and Nitrous Oxide
Q.3:- The gas causing acid rain in an industrial area is ?
- Carbon Dioxide
- Carbon Monoxide
- Sulphur Dioxide
- Methane
Q.4:- Benzene cannot undergo ?
- Substitution
- Addition
- Elimination
- Oxidation
Q.5:- Which of the following is colourless ?
- Chlorine
- Oxygen
- Phosphorous
- Sulphur
Q.6:- Brass gets discoloured in air due to constant exposure in presence of ?
- Aluminium Phosphide
- Hydrogen Sulphide
- Hydrogenated Wafers
- Aluminium Sulphide
Q.7:- Which among the following is liquid non-metal ?
- Mercury
- Bromine
- Water
- Alcohol
Q.8:- Philosopher’s Wool is ?
- Zinc Carbonate
- Zinc Sulphate
- Zinc Oxide
- Zinc Blende
Q.9:- Bleaching powder is prepared by passing ?
- Chlorine over slaked lime
- Oxygen over slaked lime
- Carbon dioxide over slaked lime
- Chlorine over quick lime
Q.10:- The element used for making solar cells is ?
- Magnesium
- Sodium
- Calcium
- Silicon
Q.11:- Refrigerators keep food unspoiled because ?
- At its low temperature, bacteria and moulds are inactive
- At its low temperature, the germs are killed
- At its low temperature, the germs are frozen
- It sterilises the food
Q.12:- The resources which can be used continuously, year after year are called ?
- Biotic
- Abiotic
- Non-Renewable
- Renewable
Q.13:- The mass number of a nucleus is ?
- Always less than its atomic number
- Always more than its atomic number
- Always equal to tits atomic number
- Sometimes more and sometimes equal to its atomic number
Q.14:- In addition to Hydrogen, the other abundant element present on Sun’s surface is ?
- Helium
- Neon
- Argon
- Oxygen
Q.15:- The acid which is secreted by the glands in the stomach wall is ?
- Sulphuric Acid
- Hydrochloric Acid
- Nitric Acid
- Phosphoric Acid
Q.16:- In the electroplating of gold, the electrolyte used is ?
- Gold Chloride
- Gold Nitrate
- Gold Sulphate
- Potassium Aurocyanide
Q.17:- In a nuclear reactor the material use for absorbing neutrons is ?
- Zinc
- Radium
- Lead
- Cadmium
Q.18:- Which of the following is a renewable source of energy ?
- Coal
- Geothermal Powder
- Natural Gas
- Uranium
Q.19:- The material used in solar cells contains ?
- Tin
- Silicon
- Caesium
- Thallium
Q.20:- Gold dissolves in ?
- Hydrochloric acid
- Nitric acid
- Aqua-regia
- Acetic Acid
Q.21:- The coloured discharge tubes for advertisement mainly contain ?
- Xenon
- Argon
- Helium
- Neon
Q.22:- When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is ?
- Hydrogen
- Oxygen
- Carbon Dioxide
- All of them
Q.23:- The Fungus which is used in the alcohol industry is ?
- Mushroom
- Candida Aibicans
- Yeast
- Rhizopus
Q.24:- Cement containing excess amount of lime ?
- Cracks during setting
- Becomes more strong
- Is slow setting
- Is quick setting
Q.25:- What particles move around the nucleus of an atom and are negatively charged ?
- Electrons
- Protons
- Positrons
- Neutrons
