Which of the following time intervals can be measured using 4 ropes and a lighter? ( Mul- tiple answers are correct, marking all of them will get you points)

What is the smallest time interval which can be measured accurately : with clocks and watches used in sports meets ?

Which of the following compounds can be optically active? Select correct answer using the codes given :

In an examination there are 4 multiple choice questions and each question has four choices of which only one is correct. Number of ways in which a student fails to get all the answers correct, if he had attempted all the questions is

To earn his wand, Harry was given 4 ropes and a lighter. Each rope burns at a non-con- stant rate but takes exactly one hour to burn completely from one end to the other. Harry can only light the ropes at either of their ends but can decide when to light each end as he sees fit. The goal is to use the ropes to measure time. For example, the time taken to burn one rope if burnt from only one end is 1 hour. So 1 hour can be measured using the ropes. Similarly, at max, how many lengths of time can be measured using these ropes? The right answer earns him his wand.

Which SI units would you use for the following measurements? the time it takes a swimmer to swim a lap

Use your brain power: Amar, Akbar and Anthony are travelling in different cars with different velocities. The distance covered by them during different time intervals are given in the following table. Are all the distances covered by Akbar in the fixed time intervals the same?

For the following questions answer them individually Which of the answer figures can be formed using the questions figures.