P-1 Lenses — Science STD 10 — Question

Rusting of iron is a fast reaction.

The virtual image of object seen by the eye depends on the angle subtended by the object with the eye.

• Right

• Wrong

When an object is placed in front of a concave lens, its image is obtained on the opposite side of the object.

Newlands was the first to classify elements having similar chemical properties into groups of three.

The zig-zag line separates the metals from nonmetals in the periodic table i.e. metals are on the left side and nonmetals are on the right side.

Two carbon atoms can always form one or two covalent bonds.

Lanthanides and actinides are also called the d-block elements.

If edible oil is left aside for a long time, it will get rancid.

• Right

• Wrong

When light ray travels from denser medium to rarer medium, it travels parallel to the normal.

There is heat energy stored in coal.