Work And Energy — Science STD 9 — Question

A boy is sitting on a merry-go-round which is moving with a constant speed of 10 ms^-1. This means that the boy is:

Which of the following could not be a unit of acceleration?

The inertia of an object tends to cause an object:

1. To increase its speed.
2. To decrease its speed.
3. To resist a change in its state of motion.
4. To decelerate due to friction.

Biosphere occurs:

1. In lithosphere.
2. In lithosphere and hydrosphere.
3. At place of interaction of lithosphere, hydrosphere and atmosphere.
4. In atmosphere and hydrosphere.

The efferent part of neqron is:

1. Axon.
2. Dendrite.
3. Cyton.
4. Both (a) and (b).

Briefly explain main layers of the atmosphere.