Q. Who was the first scientist of the world to use the symbols to represent elements in a shortway?
2) Jons Jakob Berzelious
3) Neils Bohr
4) Dmitri Mendeleev
Q. Which of the following is/ are physical changes?
I. Melting of iron rod
II. Rusting of iron metal
III. Bending of an iron rod
IV. Drawing a wire of iron metal
Correct code is -
1) Only I, II and III
2) Only I, II and IV
3) Only I, III and IV
4) Only II, III and IV
Q. Milk of Magnesia is a -
2) True solution
3) Homogeneous Mixture
Q. Which mineral is also known as fool's gold?
Q. The physics phenomenon when, in polar regions like Alaska and Northern Canada, a splendid display of colours is seen in the sky is called a/an -
1) aurora borealis
2) star shower
3) active galactic nucleus
4) star's intrinsic luminosity
Q. Which of the following metals in pure form has the highest melting point?
Q. All the mixtures containing a solid and a liquid can be separated by -
Correct code is -
1) Only I
2) Only II and III
3) I, II, III and IV
4) Only III and IV
Q. Which of the following is not a characteristic of a physical change?
1) It is a temporary change
2) It is usually an irreversible change
3) Very little heat (or light) energy is usually absorbed or given out
4) The mass of a substance does not alter in a physical change
Q. Sound cannot travel through -
Q. What is the correct ascending order of the following substances in relation to their density (kg/ m3)?
1) Aluminium, Iron, Mercury, Gold
2) Gold, Iron, Aluminium, Mercury
3) Mercury, Iron, Gold, Aluminium
4) Iron, Gold, Mercury, Aluminium
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