Class 9  >  Science Class 9  >  Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure Download as PDF

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Class 9


Test Description

25 Questions MCQ Test Science Class 9 - Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure for Class 9 2023 is part of Science Class 9 preparation. The Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure questions and answers have been prepared according to the Class 9 exam syllabus.The Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure below.
Solutions of Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure questions in English are available as part of our Science Class 9 for Class 9 & Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure solutions in Hindi for Science Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure | 25 questions in 25 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Class 9 for Class 9 Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you? Download the App
Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 1

A combination of common salt and iron filings is a

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 1

A combination of common salt and Iron filings is a mixture as there is no chemical reaction between them to form new substance.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 2

4 g of solute are dissolved in 36 g of water. What is the mass percent of the solution?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 2

Mass percent of solution = (mass of solute / mass of solution)×100%(mass of solute / mass of solution)×100%
= (4/4+36)×100%
= 10%.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 3

Air shows the property of

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 3

Air is a mixture of gases consisting of approximately 4/5 Nitrogen and 1/5 Oxygen.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 4

Nanometer is an         

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 4

Nano means very small so it is used as an unit for measuring very small things. The correct answer is option 'C'.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 5

At room temperature, a non-metal which is liquid is

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 5

At room temperature, Bromine is present in liquid state. Bromine is a non-metal belonging to family of halogens.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 6

Statement A: The separation of constituents from homogeneous mixture is easier as compared to heterogeneous mixture.
Statement B: Milk can be regarded as a pure substance Which of the two statements is correct?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 6

The separation of constituents from homogenous mixture is difficult as compared to heterogeneous mixture. Milks is a colloidal substance. So, milk is not a pure substance.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 7

Match the following with correct response. 

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 8

Statement A: Brass is a solution while gun powder is not 
Statement B: Air represents a solution in terms of science 
Which of the two statements is true

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 8

Brass is a homogeneous mixture of copper and Zinc. Gun powder is not a powder is a simple mixture of saltpeter, sulfur and charcoal.
Air is an example of a solution (gaseous solution) because it is a homogeneous mixture of different gases like oxygen, nitrogen, helium, hydrogen, etc.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 9

The element which is a liquid slightly above 300C is

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 9

Cesium is a metal which has very low melting point and change into liquid state above  300C.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 10

Identify homogeneous mixture from the following

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 10

A dilute solution of alcohol in water is an example of homogenous mixture. Alcohol and water do not forms a separate boundary if left undisturbed and both are uniformly distributed.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 11

Match the following with correct response. 

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 11

B is the correct option.
1.Aerosol particles originating from urban and industrial pollution or smoke from fires have been shown to affect cloud microphysics, cloud reflection of sunlight to space, and the onset of precipitation.
2. a fine dispersion of minute droplets of one liquid in another in which it is not soluble or miscible.
3.Whipped cream is an air-in-water foam in which air cells are surrounded by a film containing fat droplets stabilized by a film of protein. 
4. The use of sol-silicate paint protects the old substrate from further destruction due to UV exposure, and creates an absolutely lightfast and colour-stable surface. 

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 12

Find the incorrect statement

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 12

Air is mixture and no energy change occurs during mixing of air. Cesium and gallium are liquid at room temperature. Pure substance have fixed melting and boiling points. Mixture is not a single substance.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 13

Which one is NOT an element?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 13

Elements include metals, non-metals and semi-metals (metalloids). Alloys are mixture of two or more elements.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 14

Match the following with correct response. 

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 15

Diamond is lustrous because

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 15
Why is diamond lustrous?
Diamond is lustrous due to its unique properties and characteristics. Here is a detailed explanation:
1. Hardness:
Diamond is the hardest known natural material. Its hardness is a result of its carbon atoms being tightly bonded in a crystal lattice structure. This hardness allows diamond to reflect and refract light, contributing to its luster.
2. Refractive Index:
Diamond has a high refractive index, which means it can bend and reflect light at a greater angle than other materials. This property enhances the brilliance and sparkle of diamond, making it highly lustrous.
3. Optical Properties:
Diamond has excellent optical properties, including high dispersion and high transparency. Dispersion refers to the ability of a material to separate white light into its spectral colors, creating the rainbow effect. This dispersion adds to the diamond's overall luster and fire.
4. Surface Smoothness:
Diamond has a naturally smooth surface, which allows light to pass through and reflect without scattering. The smoothness of diamond's surface enhances its luster by maximizing the amount of light that is reflected back to the viewer's eye.
5. Cut and Polishing:
Diamonds are cut and polished to maximize their luster and brilliance. Skilled craftsmen shape the diamond facets in a way that optimizes light reflection and refraction. The precision in cutting and polishing further enhances the diamond's luster.
In conclusion, diamond's luster is a result of its hardness, high refractive index, excellent optical properties, smooth surface, and the craftsmanship involved in cutting and polishing it. These factors combined create the dazzling sparkle and brilliance that diamonds are known for.
Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 16

Which one is physical change?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 16

Adding of common salt (NaCl) to water is physical change as no new substance is formed and no heat is evolved during addition of salt in water.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 17

A hard substance when bent produces a tinkling sound. Predict its nature.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 17

Metal are generally hard and produce tinkling sound when bent. Non-metals are brittle and compounds cannot be bent.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 18

Match the following with the correct response. 

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 18

Solution is a homogeneous mixture because it is made up two or more substance and chemical composition is uniform throughout.
Suspenison is a heterogeneous mixture because the chemical composition is not uniform and particles are arranged differently in a heterogeneous mixture i.e.random arrangement of particles takes place in a heterogeneous mixture.
Solute is the component of a solution that is to dissolved into the solvent.
Solvent is the medium which is in large quantity and solute is in less quantity as it is the matter which is to be dissolved into solvent let's take an example there is sugar and water. You dissolved sugar in water so water here acts as a solvent and sugar here acts as a solute which is to be dissolved into the solvent i.e. present in large quantity.
Thus, the final answer is 1-D, 2-A, 3-C and 4-B.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 19

1 carat of diamond is equal to

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 19

Carat is a unit of mass and is used for measuring gemstones and pearls.  1 ct. = 200 mg

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 20

Which of the following are chemical changes?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 20

Cooking of vegetables is a chemical change because a new substance is formed having new properties and heat is used to change the state. Cooked vegetable cannot be reversed back as raw vegetable.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 21

A shining thick liquid is often used in glass thermometers. Name it.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 21

Mercury is a thick shining liquid used commonly in glass thermometer. It does not stick with wall and expands uniformly on heating.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 22

Cod-liver oil is an example of

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 22

Cod-liver oil is an example of Emulsion. Emulsion is a kind of colloid in which minute droplets of one liquid are dispersed in another liquid which is not miscible with it.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 23

How will you bring about the following separation Alcohol from water?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 23

The solution of Alcohol and water is miscible. Alcohol and water can be separated by the process of fractional distillation due to difference in boiling point of two liquids.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 24

What happens on adding dilute HCl to a mixture of iron filling and sulphur powder? 
A. H2S is formed 
B. A colour less and odourless gas is formed 
C. A greenish solution appears 
D. FeS is formed

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 24

When HCl is added to iron filling then chlorine of HCl reacts with iron by evolving hydrogen gas. The iron dissolves, releasing hydrogen and making an iron chloride solution.

Fe + 2HCl → FeCl₂ + H₂ or

2Fe + 6HCl → 2FeCl₃ + 3H₂

-FeCl₂ is a greenish solution.

Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 25

Thermometer is an instrument that measuring

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure - Question 25

The correct option is A.
A thermometer is an instrument that measures temperature. It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air. The three most common units of measurement for temperature are Celsius, Fahrenheit, and kelvin. The Celsius scale is part of the metric system.

66 videos|352 docs|97 tests
Information about Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure Page
In this test you can find the Exam questions for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure solved & explained in the simplest way possible. Besides giving Questions and answers for Lakhmir Singh & Manjit Kaur Test: Is Matter Around Us Pure, EduRev gives you an ample number of Online tests for practice
66 videos|352 docs|97 tests
Download as PDF
Download free EduRev App
Track your progress, build streaks, highlight & save important lessons and more!