Science - Questions

CBSE 9th standard Questions

Which separation techniques will apply for the separation of the following? (a) Sodium chloride from its solution in water.(b) Ammonium Chloride from a mixture containing Sodium Chloride and Ammonium Chloride.(c) Small pieces of metal in the engine oil of a car. (d) Different pigments from an extract of flower petals.(e) Butter from curd.(f) Oil from water.(g) Tea leaves from tea.(h) Iron pins from sand.(i) Wheat grains from husk.(j) Fine mud particles suspended in water.
(class: 9th std )    Science

Write the steps you would use for making tea. Use the words - solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
(class: 9th std )    Science

Explain the following giving examples:(a) Saturated solution, (b) Pure substance, (c) Colloid, (e) Suspension.
(class: 9th std )    Science

Classify each of the following as a homogeneous or heterogeneous mixture: soda water, wood, air, soil, vinegar, filtrated tea. How would you confirm that a colourless liquid given to you is pure water?
(class: 9th std )    Science

Which of the following materials fall in the category of a ‘pure substance’?(a) Ice (b) Milk (c) Iron (d) Hydrochloric acid (e) Calcium oxide (f) Mercury (g) Brick (h) Wood (i) Air.
(class: 9th std )    Science

Which of the following will show “Tyndall effect”?
(class: 9th std )    Science

Classify the following into elements, compounds and mixtures.(a) sodium (b) soil (c) sugar solution (d) silver (e) calcium carbonate (f) tin (g) silicon (h) coal (i) air (j) soap (k) methane (l) carbon dioxide (m) blood
(class: 9th std )    Science

How is air separated from its constituents?
(class: 9th std )    Science

How will you obtain pure copper sulphate from an impure sample?
(class: 9th std )    Science

How can matter be classified on the basis of its chemical constitution?
(class: 9th std )    Science

Define with example: (a) Mixture (b) Metalloid (c) Compound
(class: 9th std )    Science

Name the separating processes for the following: (a) A solid substance dissolved in a liquid. (b) Fine insoluble particles suspended in a liquid. (c) Salt from sea water. (d) Three different coloured solid substances soluble in a mixture of solvents. (e) Two immiscible liquids. (f) Two immiscible liquids having 10OC difference in their boiling points. (g) Mixture of Nitrogen and Helium gases.
(class: 9th std )    Science

What should be the minimum difference in temperature between the boiling points of two miscible liquids that these can be separated by simple distillation method?
(class: 9th std )    Science

Give two important industrial applications of fractional distillation.
(class: 9th std )    Science

What are ‘fractionating column’ and ‘fractional distillation’?
(class: 9th std )    Science

Name the material which shows the average properties of the constituents contained in it.
(class: 9th std )    Science

Identify solution among the following mixtures (a) gun powder (b) aerated water (c) soil (d) blood
(class: 9th std )    Science

Most elements are (a) solids (b) liquids (c) gases (d) mixtures
(class: 9th std )    Science

Components retain their properties in a (a) compound (b) mixture (c) element (d) none of these
(class: 9th std )    Science

Gases e separated from each other by (a) fractional evaporation (b) fractional distillation (c) fractional crystallization (d) fractional sublimation
(class: 9th std )    Science

Shaving cream is colloidal solution of (a) gas in liquid (b) liquid in liquid (c) solid in liquid (d) gas in solid
(class: 9th std )    Science

Which of the following is a compound: (a) air (b) solution (c) marble (d) stainless steel
(class: 9th std )    Science

Which one of the following may be termed as a pure substance: (a) sodium chloride (b) soft drink (c) aerosol (d) soil.
(class: 9th std )    Science

Which one of the following is a physical change (a) burning of agnesium (b) exposure of iron to moisture (c) dissolution of sugar in water (d) formation of a compound
(class: 9th std )    Science

Emulsion is a colloidal solution of liquid in (a) solid (b) liquid (c) gas (d) air
(class: 9th std )    Science

Which is a homogeneous mixture? (a) it has a fixed composition (b) it has uniform composition (c) it has non-uniform composition (d) it can not be broken down to simpler substances
(class: 9th std )    Science

Find the energy in kWh consumed in 24 hours by two electric devices, one of 100 W and other of 500 W.
(class: 9th Std )    Science

Give reason for the following :Work done by gravitational force on an object moved along a horizontal path is zero.
(class: 9th Std )    Science

A girl fills up 10 pages of a note book in order to practice sums yet she has not done "work" in terms of Science/Scientific concept.
(class: 9th Std )    Science

Give reason for the following : The kinetic energy of a freely falling object increases yet it holds law of conservation of energy. .
(class: 9th Std )    Science

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