Pointing to an old man, Aditya said, "His son is my son's uncle." How is the old man related to Aditya?
Expansion on heating, contraction on cooling and change of state is
(A) Chemical change
(B) Permanent change
(C) Reversible change
(D) Irreversible change.
Read the given statements and mark the correct option.
Statement 1 : Some changes that result in the formation of new substances are called chemical changes.
Statement 2 : Chemical changes are permanent changes.
(A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
(B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
(C) Statement 1 is true and statement 2 is false.
(D) Statement 1 is false and statement 2 is true.
Our atmosphere has 78% nitrogen gas. Nitrogen is one of the essential constituent of all living organisms as part of proteins, chlorophyll, nucleic acid and vitamins. Select the correct statement related to nitrogen.
(A) Not useful for plants
(B) Important for growth of plants, and is taken by all plants from the air
(C) Important for growth of plants, but only some plants absorb the nitrogen present in the airdirectly
(D) Important for growth of plants, but no plant can absorb the nitrogen present in the air directly.
Even in the process of nitrogen fixation, the plant does not take the nitrogen directly and bacteria transforms the nitrogen to nitrates, so how is (c) the right answer?
What happens when we touch a hot kettle?
A Skin → Nerves → Hand is pulled back
B Skin → Nerves → Spinal cord → Nerves → Hand is pulled back
C Skin → Brain → Nerves → Hand is pulled back
D None of these
Which of the following is a fact about asteroids?
A Asteroids do not revolve around the Sun the way planets do.
B The asteroid belt is between Venus and Jupiter.
C Asteroids are planet like objects, but smaller and often irregularly shaped.
D Asteroids cannot be classified into groups.
Select the correct statement from the following.
A Milky way is the only spiral shaped galaxy in the Universe.
B Planet Venus is the hottest planet of our solar system.
C Satellites like Moon are small heavenly bodies that revolve around a star.
D A solar year consists of 363 days.