1.) A building has two lifts. One lift stops only at even numbered floors and the other stops only at odd numbered floors. What is the advantage in operating the lifts in this manner, instead of both lifts stopping at every floor?

A. It makes sure that both the lifts are used for an equal number of trips.

B. It reduces the time taken to reach the required floor, as the lifts can move faster.

C. The total number of people that can be carried by two lifts is increased.

D. It makes sure that the lifts are always full while going up and while coming down.

2.) During winter in the temperate regions, days are short. Air samples taken since 1986, during winter in Canada which lies in the temperate region, show that the average atmospheric carbon dioxide concentration in winter is higher than it is in summer.
Which of the following statement is the most likely reason for this?

A. Plants breathe very little during the winter months.

B. More animals respire actively in the winter months.

C. The amount of photosynthesis taking place is less in winter.

D. Plants and animals use up stored food for respiration in winter.

3.) Parul has two colourless solutions P and Q. solution P turns red litmus paper blue. She mixes solutions P and Q together. On evaporation of the mixture she obtains crystals of common salt. Which of the following is solution Q likely to do?

A. Turn yellow turmeric paste red in colour

B. Cool down lime water when mixed with it.

C. Produce a gas when mixed with baking soda.

D. (Nothing can be said with just the given information.)​