How many strands are supporting the load in case of block and tackle system of 5 pulleys?  

1. 4
2. 5
3. 6
4. 7

How many strands are supporting the load in case of block and tackle system of 4 pulleys when effort is in downward direction?

1. 5
2. 4
3. 3
4. 6

For greater efficiency of block and tackle pulley system:

1. The lower block should be of negligible weight.
2. The upper block should be of negligible weight.
3. The number of pulleys should be minimum.
4. The weight of the rope should be equal to the weight of the pulleys.

Assertion (A): The mechanical advantage of class III levers is always less than 1.

Reason (R): This is because the effort arm is always greater than the load arm.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.