Q. The r.m.s. the potential difference between the red live wire and a black neutral wire in Indian domestic electric supply is -
1) 160V
2) 220V
3) 300V
4) 410V
Q. The hydrogen bomb and the uranium bomb are based, respectively on -
1) nuclear fusion and fission
2) fission and thermonuclear fusion
3) geothermal fission and fusion
4) geothermal fusion and fission
Q. Sound and light waves are -
1) respectively longitudinal and transverse in air
2) respectively transverse and longitudinal in air
3) both longitudinal in air
4) both transverse in air
Q. What is the chemical composition of a soda-acid type fire extinguisher?
1) Solution of sodium hydrogen carbonate and sulfuric acid
2) Solution of sodium carbonate and sulfuric acid
3) Solution of carbon dioxide and sulfuric acid
4) Solution of sodium chloride and sulfuric acid
Q. Consider the following statements -
While diluting concentrated nitric acid solution
(1) the concentration of (H3O+) ions/volume increases
(2) water must be added slowly to concentrated acid
(3) acid must be added slowly to water
Which of the statements given above is/are correct?
1) All 1, 2, and 3
2) Only 1 and 2
3) Only 3
4) Only 2 and 3
Q. Which one of the following is the correct order of pH for the given substances?
1) Coffee < Lemon juice < Milk of magnesia < Blood
2) Milk of magnesia < Blood < Coffee < Lemon juice
3) Lemon juice < Blood < Coffee < Milk of magnesia
4) Lemon juice < Coffee < Blood < Milk of magnesia
Q. Which one of the following is not true for an anodizing process?
1) It makes aluminium corrosion resistant.
2) Metals like aluminium, titanium and magnesium can be anodized.
3) Clean aluminium article is the anode and oxygen gas is evolved at the cathode.
4) It is used in aircraft industry.
Q. Naphthalene burns with a yellow sooty flame. This is because -
1) carbon to hydrogen ratio is low
2) there is incomplete combustion
3) there is an excess supply of air
4) of the presence of impurities of nitrogen and sulfur
Q. Which of the following statements are true for the reaction of Fe2O3 with aluminium?
1. It is known as the 'thermite reaction'.
2. The heat evolved is used for welding purposes.
3. Aluminium metal acts as an oxidizing agent.
4. Molten Fe and Al are formed at the end of the reaction.
Select the correct answer using the code given below -
1) 1 and 2
2) 1 and 3
3) 2 and 4
4) 1 and 4
Q. Manav is planning to visit all UNESCO World Heritage Sites in Delhi. He will be visiting -
1) Red Fort, Qutab Minar, Jama Masjid
2) Red Fort, India Gate, Qutab Minar
3) Red Fort, Qutab Minar, Humayun Tomb
4) Red Fort, Humayun Tomb, India Gate
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