Examine the following statements:

1. All colors are pleasant.
2. Some colors are pleasant.
3. No color is pleasant.
4. Some colors are not pleasant.

Given that statement 4 is true, what can be definitely concluded?

Consider the given statement and the two conclusions that follow:

Statement: Morning walk is good for health.

Conclusions:

1. All healthy people go for morning walk.
2. Morning walk is essential for maintaining good health.

What is/are the valid conclusion/conclusions?

A watch loses 2 minutes in every 24 hours while another watch gains 2 minutes in every 24 hours. At a particular instant, the two watches showed an identical time. Which of the following statements is correct if a 24-hour clock is followed?

In a test, Randhir obtained more marks than the total marks obtained by Kunal and Debu. The total marks obtained by Kunal and Shankar are more than those of Randhir. Sonal obtained more marks than Shankar. Neha obtained more marks than Randhir. Who amongst them obtained the highest marks?

Consider the following:

1. A + B means A is the son of B.
2. A – B means A is the wife of B.

What does the expression $P + R – Q$ mean?

If the route between G and C is closed, which one of the following stations need not be passed through while travelling from H to C?