Answers given below of these Questions
(a) salt solution
(b) Milk
(c) copper sulphate solution
(d) starch solution
Q2. Tincture of iodine has antiseptic properties. This solution is made by dissolving
(a) Iodine in potassium iodide
(b) iodine in Vaseline
(c) iodine in water
(d) iodine in alcohol
Q3. Rusting of an article made up of iron is called
(a) Corrosion and it is a physical as well as chemical change
(b) Dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change
Q4. Blood and sea water are
(a) both mixtures
(b) both are compounds
(c) blood is a mixture whereas sea water is a compound
(d) blood is a compound and sea water is a mixture
Q5. Boron and carbon are
(a) metalloids
(b) metalloids and non- metal respectively
(c) metal
(d) non-metal and metalloid respectively
Q6. Identify the physical changes.
(i) melting of iron metal
(ii) rusting of iron
(iii) bending of an iron rod
(iv) drawing a wire of iron metal
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)
Q7. A mixture of sulphur and carbon disulphide is
(a) Heterogeneous and shows Tyndall effect
(b) homogeneous and shows Tyndall effect
(c) heterogeneous and does not show Tyndall effect
(d) homogeneous and does not show Tyndall effect
Q8. Which of the following method would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration
Q9. Name the metal which exist in liquid state at room temperature.
(a) Sodium
(b) Potassium
(c) mercury
(d) bromine
Q10.Element which is not a metalloids
(a) Silicon
(b) Germanium
(c) Tungsten
(d) Boron
Q11. The amount of camphor keeps on decreasing if we put it in an open container due to
(a) Precipitation
(b) Condensation
(c) Sublimation
(d) Evaporation
Q12.How many elements are in gaseous state at room temperature?
(a) 11
(b) 23
(c) 14
(d) 9
Q13. Which application is used in diagnostic laboratories for blood and urine test?
(a) Chromatography
(b) Centrifugation
(c) Fractional distillation
(d) Sublimation
Q14. Chromatography is used to separate
(i) Colours in a dye
(ii) Butter from cream
(iii) Drugs from blood
(iv) Mixture of oil and water
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (iii) and (i)
(d) (iv) and (ii)
Q15. The continuous zig-zag movement of colloidal particles in dispersion medium is called
(a) Tyndall effect
(b) Brownian movement
(c) Oscillation
(d) Dispersion
Q16. Non-metal which is good conductor of electricity
(a) Graphite
(b) Silicon
(c) Gold
(d) Aluminium
Q17. Which statement is true about compound?
(a) It has a variable composition
(b) It shows properties of constituent substances
(c) It is mixed any proportion by mass
(d) Elements react to form new compounds
Q18. Sodium chloride dissolved in water can be separated by
(a) Physical process
(b) Physical process of evaporation
(c) Chemical process
(d) Chemical process of extraction
Q19.Brass is a mixture of
(a) Zinc, Mg
(b) Zinc, Copper
(c) Zinc, Carbon
(d) Zinc, Co
Q20. When more than one kind of pure form of matter combines it forms
(a) Solution
(b) Component
(c) Texture
(d) Mixture
Q21. Mixture of two or more metals, or metals and non-metal is known as
(a) Solution
(b) Mixture
(c) Alloy
(d) Metalloid
Q22. The component of solution that dissolved in solvent is
(a) Solvent
(b) Solute
(c) Sugar
(d) Mixture
Q23. Air is which type of mixture
(a) Gas
(b) Homogeneous
(c) Heterogeneous
(d) Solid
Q24. The amount of solute present in the saturated solution at this temperature is called its
(a) Unsaturation
(b) Diffusion
(c) Collusion
(d) Solubility
Q25. Mass of solute divided by mass of solution multiply by 100 is formula to get
(a) Mass
(b) Mass percentage of solution
(c) Volume percentage
(d) Solution
Q26. When solids are dispersed in liquids it is called
(a) Dissolution
(b) Collusion
(c) Suspension
(d) Diffusion
Q27. Crystallisation method is used to purify
(a) Gases
(b) Solids
(c) Metals
(d) Liquids
Q28. Dye and black ink is separated by the method of
(a) Chromatography
(b) Sublimation
(c) Suspension
(d) Distillation
Q29. Korma is used for
(a) Dyes
(b) Paints
(c) Colours
(d) Liquids
Q30. Petroleum products are separated by the method of
(a) Fractional distillation
(b) Sublimation
(c) Suspension
(d)Distillation
Answers :-
1 - Both (a) and (b) Milk and starch solution.
2 - (d) iodine in alcohol
3 - (c) corrosion and it is a chemical change
4 - (a) both mixtures
5 - (b) metalloid and non-metal respectively
6 - (c) (i), (iii) and (iv)
7 - (d) homogeneous and does not show Tyndall effect
8 - (c) Centrifugation
9 - (c) mercury
10 - (c) tungsten
11 - (c) sublimation
12 - (a) 11
13 - (b) centrifugation
14 - (c) (iii) and (i)
15 - (b) Brownian movement
16 - (a) graphite
17 - (d) elements react to form new compounds
18 - (b) physical process of evaporation
19 - (b) Zinc, copper
20 - (d) mixture
21 - (c) Alloy
22 - (b) solute
23 - (b) homogeneous
24 - (d) Solubility
25 - (b) mass percentage of solution
26 - (c) suspension
27 - (b) solids
28 - (a) chromatography
29 - (c) colours
30 - (a) fractional distillation
