Quiz 2

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) Temperature of the solution decreases

(ii) Temperature of the solution increases

(iii) Temperature of the solution remains the same

(iv) Salt formation takes place

• (i) and (iv)

• (i) and (iii)

• (ii) only

• (ii) and (iv)

When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

• absorb the evolved gas

• moisten the gas

• absorb moisture from the gas

• absorb Cl– ions from the evolved gas

Which one of the following salts does not con-tain water of crystallisation?

• Blue vitriol

• Baking soda

• Washing soda

• Gypsum

Magnesium ribbon is rubbed before burning because it has a coating of

• basic magnesium carbonate

• basic magnesium oxide

• basic magnesium sulphide

• basic magnesium chloride

What is the phenomenon where a wave changes direction as it passes from one medium to another?

• • Reflection

• • Refraction

• • Diffraction

• • Interference

Which law states that the total energy of an isolated system remains constant over time?

• • Newton's First Law

• • Law of Conservation of Energy

• • Ohm's Law

• • Boyle's Law

Which of the following is a vector quantity?

• • Speed

• • Distance

• • Mass

• • Displacement

In order to pass in exam a student is required to get 780 marks out of the aggregate marks. Sonu got 728 marks and was declared failed by 5 percent. What are the maximum aggregate marks a student can get in the examination?

• 1040

• 1100

• 920

• 850

In an election a candidate who gets 84% of the vote is elected by a majority of 476 votes.What is the total no. of votes polled?

• 557

• 646

• 735

• 700

Applied to a bill of Rs. 100000 the difference between a discount of 40% and two successive discounts of 36% and 4% is

• 1200

• 1244

• 1400

• 1440