Question

Assertion: On a rainy day, it is difficult to drive a car or bus at high speed.
Reason: The value of coefficient of friction is lowered due to wetting of the surface.

A. If both A and R are true, and R is a correct explanation of the A
B. If both A and R are true, but R is not a correct explanation of the A
C. If A is true, but R is false
D. If both A and R are false

Answer 1

Hint:We need to know what are ideal conditions to drive a car or bus at high speed that is what type of surface is needed. Does the surface need to be dry or wet, or smooth or rough. As we know when it rains the surface becomes wet and due to this also somewhat smooth.




Complete answer:
As we know, on a rainy day when the water falls on the surface (here it is road) it gets wet.
This causes the surface to become somewhat smooth. Therefore, the coefficient of friction between the tyres of the car or bus and the surface of the road becomes lowered.
This might lead to skidding of a car or bus while driving on that particular road.

We know that it is the friction only that helps in moving a particular vehicle and it should not be lowered for smooth driving of the car or bus. That’s why it is difficult to drive a car or bus at high speed on a rainy day in order to avoid skidding.

Therefore, both the assertion and reason are correct and Reason is the correct explanation of the Assertion.

Hence, the correct answer is Option A.





Note: Try to know about the concept of friction and coefficient of friction in case of moving an object or here as of driving a car or bus. Then apply that concept in both the assertion and reason and find out whether it is true or false and if true then reason is the correct explanation for that or not.