Multiple choice

Consider the following statements:

  1. Mountain roads rarely go straight up the slope but wind up gradually.
  2. An inflated balloon will rise to a definite height in atmosphere and then it will come to rest.

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Solution 1 is correct. When a road goes straight up, the slope is large and hence the frictional force is small. Now due to insufficient friction, the wheels slip on the road. Moreover for a large slope, more power will have to be used. Solution 2 is also correct. An inflated balloon will rise to a definite height in atmosphere and then it will come to rest. It will come at rest when the atmospheric pressure is equal to the air pressure inside the balloon.

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