West Bengal Class 8 English Medium Science Solution Chapter 2.1 Nature of Matter

On this Page we have given West Bengal Class 8 English Medium Science Solution Chapter 2.1 Nature of Matter Question and Answer for our Students of West bengal Class 8 English Medium. Hope this following Question Answer will help our Students.

West Bengal Class 8 | Science | Nature of Matter

 

MCQ

1 ) Anything that has mass and occupies  space is known as

a) matter b) solid b) plasma d) compound

Ans. Matter

2) Water begins to boils at a temperature of

a ) 100⁰F b) 100 K c) 100⁰C d) 100 joule

Ans. 100⁰C

3) Solids change their state to liquid due to the

a ) release of heat b) absorption of heat

c) decrease in intermolecular space

d) all of the above

Ans. Absorption of heat

4) choose the incorrect statement regarding solids

a ) it has a fixed volume

b ) it has a fixed shape

c) it has a fixed mass

d) it can flow

Ans. It can flow

5) Which one of them has its properties mismatched

a ) ammonia –it has a pungent smell

b ) hydrogen sulfide –rotten potato smell

c) ammonia – smells like urine

d) zinc –can produce hydrogen gas chemically

Ans. Hydrogen sulfide – rotten potato smell

6) out of the 4 solvents, Identity the solvent which can dissolve Sulphur

a ) water b) kerosene c) carbon disulfide d) petrol

Ans. Carbon disulfide

7) Nitrogen oxide and nitrogen dioxide can be differentiated physically based on their

a ) color b) smell c) solubility in water d) density

Ans. Color

8) The substances are heated strongly, except one all other observations are incorrect

a ) common salt – no observable change

b ) sugar –sublimation occurs

c) Sodium iodine – turn blue black

d) magnesium ribbon –a brown gas is evolved

Ans. Common salt – no observable change

9) What should be the byproducts of this chemical reaction Zn + H2SO4

a ) 2ZnSO4

b) H2

c) ZnH2

d) ZnSO4 + H2

Ans. ZnSO4 + H2

10) Which of the following statements is not true for hydrogen

a ) it’s colourless

b) it’s odourless

c) it smells like rotten egg

d) it burns wit a pop sound

Ans. It smells like rotten egg

11) _____ are elements which show property of both metals and non metals

a ) non-metallic b) metalloid c) alloys d) bi-elemental

Ans. Metalloid

12) Identity the non-metal which has metal like lusture

a ) iodine b) sodium c) calcium d) phosphorus

Ans. Iodine

13) Metals are generally hard , but ____ is generally found in liquid form

a ) copper b) mercury c) iron d) silver

Ans. Mercury

14) One of them has their property mismatched

a ) copper is ductile

b ) gold is malleable

c) graphite is a bad conductor

d) mercury is liquid in room temperature

Ans. Graphite is a bad conductor

15) Electric wires are covered with a layer of PVC because

a ) to protect wire from physical damage

b) to prevent electrical shock

c) to prevent rusting

d) both a and b

Ans. To prevent electrical shock

16) Its difficult to cut metals through knife , but the metals that can be cut through knife are

a ) calcium b) magnesium c) rubidium d) lithium

Ans. Lithium

17) Out of them one is the hardest naturally found mineral

a ) carbon b) iron c) diamond d) platinum

Ans. Diamond

18) the oxides of metals which show properties of both metals and non metals are

a ) amphoteric b) bifuric c) diferic d) monopheric

Ans. Amphoteric

19) The water has to be ____ for calcium to react vigourously and produce hydrogen

a ) hot b) cold c) room temperature d) saturated

Ans. Cold

20) name the metallic oxide which is produced when zinc with steams

a ) ZnO b ) 2ZnO c) Zn2O d) ZnO2

Ans. ZnO

21) it is advised not to mix metallic sodium with hydrochloric acid because

a ) it produces a toxic gas

b) it reacts violently and can be harmful

c) it hard to create the conditions required

d) all of the above

Ans. It reacts violently and can be harmful

22) Place the metals in correct order of their tendency to produce hydrogen

a ) Au , Fe , Mg , K

b) Mg , K , Fe, Au

c) K , Mg , Fe , Mg

d) K , Fe , Au , Mg

Ans. K , Mg , Fe , Mg

23) What statements hold true for electropositive metals

a ) the tendency decreases from left to right

b ) K has highest tendency

c ) metals right if hydrogen can’t liberate hydrogen from dil acid

d ) all are true

And. All are true

24) What is the most abundantly found metal in a human body

a ) calcium b) sodium c) potassium d) magnesium

Ans. Calcium

25) Identify the two cations of our intracellular and extracellular body fluids

a ) K+ , Ca +

b) Na + , K +

c) Ca + , Na +

d) Cu + , K+

Ans. Na + , K+

26) We would loose the strength of our teeth in the absence of

a ) calcium, magnesium, iron

b ) iron, phosphorus, lead

c ) magnesium, iron, phosphorus

d ) calcium, magnesium, phosphorus

Ans – calcium, magnesium, phosphorus

27) The component of blood which is responsible for the transport of oxygen

a ) hemoglobin b) RBCs c) WBCs d) platelets

Ans. Hemoglobin

28) Name the hormone which is responsible for the  storage and stabilization of insulin hormone

a ) lead b) calcium c) iron d) zinc

Ans. Zinc

29) The red blood cells are matured in the ____ of our body

a ) cartilage b) bone marrow c) bone d) bladder

Ans. Bone marrow

 

Short answer questions.           

(1) What is the melting point of gold?

→The melting point of gold is 1063 degree Celsius.

(2) Which gas is produced when zinc reacts with dilute sulphuric acid?

→ Hydrogen gas

(3) Name any two physical properties of matter?

a.) Melting point

b.) Colour

(4) Name any two chemical properties of matter?

a.) Acidity

b.) Reactivity

(5) State the colour of nitrogen dioxide?

→ Nitrogen dioxide brown in colour.

(6) What happens when sodium reacts with water ?

→When sodium reacts with water, it produces evolution of heat.

(7) What happens when quicklime reacts with water?

→The quicklime reacts with water to form slaked lime.

(8) Identify the metals present in electric cable?

→ Copper , Aluminium

(9) Identify the metals present in utensils?

→ Aluminium, Copper.

(10) Name the metal which is in liquid state ?

→Mercury

(11) Name the non-metal which is a liquid state?

→ Bromine

(12) Name the three gaseous non-metals?

  • Hydrogen
  • Oxygen
  • Nitrogen

(13) Give the name of property of metals in which they are hammered into plate?

→ Malleability  is the property of metal in which they are hammered into a thin plate.

Also See: Next Part Structure of Matter Question Answer

(14) State whether the statement is correct or not.

  • Nonmetals are malleable.

Incorrect, non-metals are not malleable. They are transforming into a powder.

(15) Which nonmetals are good conductors of heat ?

→ Diamond and graphite

(16) Name the metal which is good conductor of heat but bad conductor of electricity ?

→ Diamond  is good conductor of heat but bad conductor of electricity.

(17) Nonmetals generally have dull appearance, but instead of being nonmetal Which nonmetal having metallic luster?

→ Iodine

(18) Name the oxides which are amphoteric in nature?

→ Oxides of Aluminium and zinc are amphoteric in nature.

(19) Write the four metals which do not react with water under any condition?

→ Lead , copper, gold , silver do not react with water under any condition.

(20) What happens when metallic zinc reacts with dilute hydrochloric acid?

→ When metallic zinc reacts with dilute hydrochloric acid to produce zinc salt and hydrogen gas.

(21) Name the metal and nonmetal present in cadmium chloride?

→ Metal – cadmium

Nonmetal – chlorine

(22) Name the metal and nonmetal present in plastic?

→ Carbon , nitrogen, oxygen, hydrogen, chlorine.

(23) Which metals control functioning of heart?

→ Calcium and potassium.

(24)  Name the metals which controls functioning of teeth and bones?

→ Calcium , magnesium, phosphorus

(25) How lead  may enter in the human body ?

→ Petrol, dye , insecticides , lead pipe, lead battery.

(26) Which metal plays important role in the formation of blood ?

→ Cobalt plays an important role in the maturation of RBC in a bone marrow.

(27) How aluminum can enter in the human body ?

→ Through cooking utensils , wrapper , glass industry, cosmetics, medicines like antacid.

(28) What is the abundance of oxygen in the human body ?

→ 61.42%

(29) Which metals and nonmetals are present in toothpaste ?

→ Carbon, hydrogen, oxygen , calcium , aluminum

(30) Name the metal and nonmetal present in NaCl ?

→Metal – Na

Nonmetal – Cl

Updated: May 29, 2023 — 2:20 pm

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