Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science


25 Questions MCQ Test Olympiad Preparation for Class 9 | Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science


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This mock test of Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science for Class 9 helps you for every Class 9 entrance exam. This contains 25 Multiple Choice Questions for Class 9 Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science (mcq) to study with solutions a complete question bank. The solved questions answers in this Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science exercise for a better result in the exam. You can find other Is Matter Around Us Pure - Olympiad Level MCQ, Class 9 Science extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.
QUESTION: 1

Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Is matter around us pure" are available for CBSE Class 9 Science and have been compiled as per the syllabus of CBSE Class 9 Science

Q. Milk is a _______ solution while vinegar is a ________ solution.

Solution:
True Solution: True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm. Simple solution of sugar in water is an example of true solution.
True solutions example: vinegar

Colloidal:  a homogeneous non-crystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.
Colloids example: Milk
QUESTION: 2

A liquid and a solid together consisting a single phase is known as :

Solution:
QUESTION: 3

The zig-zag movement of dispersed phase particle in a colloidal system is known as :

Solution: Mechanical Properties of Colloidal Particles: Brownian Movement. The dispersed particles present in a colloidal solution exhibit a very important property called Brownian movement. These collisions result in the random zigzag movement of the colloidal particle. The Brownian movement imparts stability to the sol.
QUESTION: 4

Milk is :

Solution: Milk: a dispersion of milk fat globules (fat particles) and casein micelles (protein particles) in a continuous phase of water, sugar (lactose), whey proteins, and minerals. Milk Plasma: what is left after you separate the fat globules; equivalent to skim milk for practical purposes.
QUESTION: 5

Scattering of light takes place in :

Solution:
QUESTION: 6

Foam is a colloidal solution of :

Solution: The types of colloids includes sol, emulsion, foam, and aerosol. Sol is a colloidal suspension with solid particles in a liquid. Foam is formed when many gas particles are trapped in a liquid or solid. Aerosol contains small particles of liquid or solid dispersed in a gas.
QUESTION: 7

Which of the following forms a colloidal solution in water ?

Solution:
Substance which forms colloidal solution in water is starch. 

Colloidal solution is a solution in which the colloid mixes uniformly. 

All colloids have a Tyndall Effect, which is not exhibited by glucose. 

Starch is a colloid and thus when mixed with water can form the colloidal solution. 

Thus, the correct option is (C) starch.
QUESTION: 8

Movement of colloidal particles under the influence of electrical field is called :

Solution: Electrophoresis is a process in which particle move under the influence of electric field
QUESTION: 9

Gelatin is also called as :

Solution:
Gelatin is made from soft bone and cartilages of an animal which have ability to form thermo- reversible gelsand amphoteric character make it as protactive colloid.
The process by which the lyophobic sols are protected from coagulation by electrolytes, because of the previous addition of lyophilic colloid is called protection; and the lyophilic colloid employed for imparting this protection, is called protective colloid, Thus when a little gelatin is added to As2S3 sol, the latter becomes very stable towards electrolytes and the resulting sol is not coagulated, until a large excess of electrolyte is added. Here, gelatin acts as a protective colloid.
QUESTION: 10

The sky looks blue due to :

Solution:
QUESTION: 11

In colloidal state, particle size ranges from :

Solution:
QUESTION: 12

Tyndall effect is observed in :

Solution:
QUESTION: 13

Brownian movement is due to :

Solution:
Brownian motion in colloidal sols arises due to the impact of the molecules of the dispersion medium with the colloidal particles. It has been postulated that the impact of the molecules of dispersion medium on the colloidal particles are unequal. This leads to the zig-zag (random) motion of the colloidal particles.
Unbalanced bombardment of the particles of dispersed phase by molecules of dispersion medium causes Brownian motion. This stabilises the sol.
QUESTION: 14

Difference between a crystalloid and a colloid is in :

Solution: Colloids: Colloids are homogeneous non-crystalline substances containing large molecules or ultramicroscopic particles of one substance dispersed in a second substance. Thus the main difference between colloids and crystalloids are their particle size.
QUESTION: 15

Blood is __________ charged sol.

Solution: Charge on blood is negative and that on haemoglobin is positive. It is true. The reason for coagulation to not occur is HEPARIN, a natural anticoagulant that is produced by Basophils and Mast cells in the body.
QUESTION: 16

Ice cream is an example of :

Solution:
Ice cream is an emulsion—a combination of two liquids that don't normally mix together. Instead, one of the liquids is dispersed throughout the other. In ice cream, liquid particles of fat—called fat globules—are spread throughout a mixture of water, sugar, and ice, along with air bubbles

QUESTION: 17

Water loving colloids are called :

Solution:
QUESTION: 18

The technique used in ultra-microscope is :

Solution:
QUESTION: 19

Coagulation occurs due to :

Solution: There are two primary destabilization mechanisms in drinking water treatment: charge neutralization and sweep flocculation. The mechanism is dependent upon the coagulant dose. Most drinking water treatment plants operate using sweep flocculation, which requires a higher coagulant dose, rather than charge neutralization. In charge neutralization, the positively charged metal coagulant is attracted to the negatively charged colloids via electrostatic interaction. Flocs start to form during the neutralization step as particle collisions occur. Adding excess coagulant beyond charge-neutralization results in the formation of metal coagulant precipitates. These metal hydroxide compounds (e.g., Al(OH)3 or Fe(OH)3) are heavy, sticky and larger in particle size. Sweep flocculation occurs when colloidal contaminants are entrained or swept down by the precipitates as they settle in the suspension.
QUESTION: 20

Sol is :

Solution:
QUESTION: 21

The separation of colloidal particles from those of molecular dimensions is called :

Solution:
QUESTION: 22

Liquid dispersed in gas is called :

Solution:
QUESTION: 23

The most abundant element in the earth's crust is :

Solution:

Oxygen is the most abundant element in the Earth's crust. Oxygen makes up 467,100 ppm (parts per million) of the Earth's crust, or 46.6%. It exists as a major compound of the silicate minerals where it combines with other elements. It also exists as a compound in carbonates and phosphates. Oxygen has industrial, medical, and commercial purposes. It is used with acetylene to cut and weld metals. It is used in hospitals to ease respiratory disease and can also be used to manufacture explosives among other numerous uses.

QUESTION: 24

The most abundant metal in the earth's crust is :

Solution: About eight percent of earth crust is aluminium, making it the most abundant metal on this planet. However, it is always find combined with various other elements never by itself in a pure state. Two of them most frequently encountered aluminium compounds are alum and and aluminium oxide.
QUESTION: 25

Drinking soda is an example of a solution of :

Solution: