Which law states that energy radiated by a black body is proportional to the fourth power of its temperature?

A body has vi = 5 m/s, a = 0 and t = 8 s. Its displacement is:

A body starts from rest and accelerates at 3 m/s^2 for 4 s. Its final speed is:

If one main-scale division is 1 mm and one Vernier division is 0.9 mm, the least count is:

Which rounding rule applies when the first dropped digit is less than 5?

When an object reverses direction, its distance is generally:

The least count of a metre rule is usually:

A digital stopwatch that reads hundredths of a second has least count:

A speed-time graph rises uniformly from 0 to 20 m/s in 4 s. Distance covered is:

A body starts from rest with acceleration 2 m/s^2. Distance covered in 5 s is:

0.00081 in scientific notation is: