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 -
(A) Only I, II and III
(B) Only I, II and IV
(C) Only I, III and IV
(D) Only II, III and IV
Answer: (C) Only I, III and IV
More Question
Question: Which of the following metals in pure form has the highest melting point?
(A) Tungsten
(B) Copper
(C) Platinum
(D) Gold
Question: All the mixtures containing a solid and a liquid can be separated by -
I. Centrifugation
II. Evaporation
III. Crystallisation
IV. Chromatography
Correct code is -
(A) Only I
(B) Only II and III
(C) I, II, III and IV
(D) Only III and IV
Question: Which of the following is not a characteristic of a physical change?
(A) It is a temporary change
(B) It is usually an irreversible change
(C) Very little heat (or light) energy is usually absorbed or given out
(D) The mass of a substance does not alter in a physical change
Question: Sound cannot travel through -
(A) Solids
(B) Liquids
(C) Gases
(D) Vaccum
Question: What is the correct ascending order of the following substances in relation to their density (kg/ m(C)?
(A) Aluminium, Iron, Mercury, Gold
(B) Gold, Iron, Aluminium, Mercury
(C) Mercury, Iron, Gold, Aluminium
(D) Iron, Gold, Mercury, Aluminium
Question: Which of the following metals exists in the liquid state?
(A) Sodium
(B) Mercury
(C) Silver
(D) Chromium
Question: Which of the following metals is not strong?
(A) Sodium
(B) Gold
(C) Silver
(D) Iron
Question: The device used for producing electric current is called -
(A) Generator
(B) Galvanometer
(C) Ammeter
(D) Motor
Question: Sun derives its energy from -
(A) The fusion of hydrogen nuclei into helium nuclei
(B) The fusion of helium nuclei into hydrogen nuclei
(C) The fission of hydrogen nuclei
(D) The fission of helium nuclei
