Thermodynamics — Physics STD 11 Science — Question

In M.K.S. system, what is the unit of coefficient of viscosity?

Two light sources of intensities 8cd and 12cd are placed on the same side of a photometer screen at a distance of 40cm from it. Where should a 80cd source be placed to balance the illuminance?

The position coordinate of a moving particle is given by x = 6 + 18t + 9t², where x is in metres and t in seconds.  What is the velocity at t = 2s?

An experimenter measures the length of a rod. Initially the experimenter and the rod are at rest with respect to the lab. Consider the following statements:

1. If the rod starts moving parallel to its length but the observer stays at rest, the measured length will be reduced.
2. If the rod stays at rest but the observer starts moving parallel to the measured length of the rod, the length will be reduced.

1. Is true but B is false.
2. B is true but A is false.
3. Both A and B are true.
4. Both A and B are false.

Using the relation E = hv, obtain the dimensions of Planck's constant.

A glass plate of length 10cm, breadth 4cm and thickness 0.4cm weighs 20g in air. It is held vertically with long side horizontal and half the plate immersed in water. What will be its apparent weight? Surface tension of water = 70 dyne/cm.

If earth were to shrink suddenly, what would happen to the length of the day?

How many amu make 1kg?

If tension of a wire is increased to four times, how is the wave speed changed?