Cloud seeding is a technique used to induce rain that was first used by USA in 1946. It has also been done in Karnataka and other places in India. What is it ?
An agricultural practice that depends on clouds
Introduction of particles in clouds to increase condensation
Making clouds and placed them in the sky
Trimming the clouds into seed like structures
In an endothermic reaction:
Energy is released
Energy is absorbed
Energy is neither released nor absorbed
Energy is not required
The growth of seedlings in a crop is a:
Undesirable change
Desirable change
Reversible change
Physical change
The making of a ring from gold is a ______ change and making a statue from wood is a _______ change.
Irreversible, reversible
Reversible, irreversible
Irreversible, irreversible
Reversible, reversible
Which of the following is the easiest to change?
The colour of your hair
The shape of your face
The colour of your eyes
Both A & C
A seed growing into a tree is an example of:
Slow physical change
Fast periodic change
Slow natural change
Man made reversible change
A chemical reaction in which energy is liberated is called:
Exothermic reaction
Endothermic reaction
Photo chemical reaction
Cooking of rice is an example of:
Irreversible change
Exothermic change
Reversible change.
Identify the substance that evaporates at room temperature:
Water
Oil
Kerosene
Ammonium chloride
When a solid directly turns into gaseous state, it is called:
Sublimation
Condensation
Polymerisation
Melting
