Assertion and reason

Exercise and reference answers

Questions

1. Reason

   Over a fixed distance, speed and time multiply to a constant.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Doubling the speed halves the journey time.

2. Reason

   At uniform speed, distance is directly proportional to time.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   A train at uniform speed covers twice the distance in twice the time.

3. Reason

   Distance equals speed multiplied by time.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   Speed and time always vary directly.

Explanation