Balloons are filled with:
(a) Helium
(b) Oxygen
(c) Nitrogen
(d) Argon
Fern belongs to:
(a) Bryophyta
(b) Pterophyta
(c) Anthophyta
(d) None of these
Potato is a modified form of:
(a) Root
(b) Stem
(c) Fruit
(d) Leaf
A plant cell is distinguished from an animal cell by the presence of:
(a) Nucleus
(b) Cell wall
(c) Cell membrane
(d) None of these
The most abundant metal in the earth’s crust is:
(a) Zinc
(b) Copper
(c) Aluminium
(d) Iron
The gas used to extinguish fire is:
(a) Neon
(b) Nitrogen
(c) Carbon dioxide
(d) Carbon monoxide
The element common to all acids is:
(a) Carbon
(b) Hydrogen
(c) Oxygen
(d) Sulphur
Which form of phosphorus is used in safety matches?
(a) White
(b) Yellow
(c) Red
(d) Black
Which of the following is used in pencils?
(a) Charcoal
(b) Silicon
(c) Phosphorus
(d) Graphite
Which of the following is best conductor of electricity?
(a) Copper
(b) Mica
(c) Zinc
(d) Silver