[ Question Bank ] - 2022 — Science STD 10 — Question

Eka-aluminium was discovered and named as gallium (Ga).

The alternating current is an oscillatory current.

• Right

• Wrong

If a spacecraft has to be sent away from the influence of the earth’s gravitational field, its velocity must be less than the escape velocity.

The velocity of light is different in different media.

The device which converts electrical energy to mechanical energy is called an electric generator.

The principal focus of a convex lens is virtual.

Different substances have different melting points.

Classification proposed by Aristotle is known as 'Natural method of classification'.

As we move from left to right in a period in Modern Periodic table, atomic size of the elements gradually increases.

The direct current always flow in one direction only.