Core Java/Chemistry MCQ for 7-8th Class Sample Test,Sample questions

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Question: 
The smallest particle of an element that retains its properties is called a(n):

1.Atom

2.Molecule

3.Compound

4.Electron

Question: 
What causes capillary action in liquids?

1.Gravitational force

2. Surface tension

3.Viscosity

4.Pressure

Question: 
What gas do plants absorb during photosynthesis?

1. Carbon dioxide

2.Oxygen

3.Nitrogen

4.Hydrogen

Question: 
What happens to the surface tension of a liquid when the temperature increases?

1.Increases

2.Decreases

3.Remains the same

4.Depends on the type of liquid

Question: 
What happens to the volume of a substance when it is heated?

1.Decreases

2.Remains the same

3.Increases

4.Depends on the substance

Question: 
What happens when you mix an acid and a base together?

1. They react to form a gas

2. They cancel each other out

3.They form a salt and water

4.They produce light

Question: 
What is the atomic number of carbon?

1.5

2.12

3.6

4.10

Question: 
What is the chemical formula for carbon dioxide?

1.CO

2.CO2

3.O2C

4.C2O

Question: 
What is the chemical formula for methane?

1.CO2

2.CH4

3.H2O

4.N2

Question: 
What is the chemical formula for table salt?

1.NaCl

2.HCl

3.NaOH

4.CaCl2

Question: 
What is the chemical formula for water?

1.H2O2

2.HO2

3.H2O

4.H3O

Question: 
What is the chemical formula for water?

1.H2O

2.HO

3.H3O

4.O2H

Question: 
What is the chemical name of baking soda?

1.Sodium bicarbonate

2. Sodium chloride

3.Sodium carbonate

4.Calcium carbonate

Question: 
What is the chemical symbol for gold?

1.Au

2.Ag

3.Go

4.Gd

Question: 
What is the chemical symbol for gold?

1.Au

2.Ag

3.G

4.Go

Question: 
What is the chemical symbol for oxygen?

1.O

2.Oc

3.Ox

4.On

Question: 
What is the chemical symbol for Oxygen?

1.O2

2.Oc

3.Ox

4.O

Question: 
What is the chemical symbol for sodium?

1.So

2.Sa

3.Na

4.Sn

Question: 
What is the pH scale used to measure?

1.Temperature

2.Acidity or alkalinity

3.Pressure

4.Volume

Question: 
What is the pH value of a neutral substance?

1.0

2.7

3.14

4.-7

Question: 
What is the process of breakdown of rocks into smaller particles called?

1.Erosion

2.Weathering

3.Sedimentation

4.Deposition

Question: 
What is the process of conversion of a liquid into vapor called?

1.Melting

2.Condensation

3.Sublimation

4.Evaporation

Question: 
What is the process of conversion of a solid directly into vapor called?

1.Melting

2.Condensation

3.Sublimation

4.Evaporation

Question: 
What is the property of a liquid to flow called?

1.Viscosity

2.Density

3.Surface Tension

4.Fluidity

Question: 
What is the SI unit of surface tension?

1.Pascal (Pa)

2.Newton (N)

3.Joule (J)

4.Newton per meter (N/m)

Question: 
What is the smallest unit of an element that still retains the properties of that element?

1.Molecule

2.Atom

3.Compound

4.Cell

Question: 
Which gas do plants use during photosynthesis?

1.Oxygen

2.Carbon dioxide

3.Nitrogen

4.Hydrogen

Question: 
Which gas is most abundant in the Earth's atmosphere?

1.Oxygen

2.Carbon dioxide

3.Nitrogen

4.Hydrogen

Question: 
Which gas is responsible for the blue color of the sky?

1.Oxygen

2.Carbon dioxide

3.Nitrogen

4.Ozone

Question: 
Which gas is responsible for the ozone layer depletion?

1.Oxygen

2.Nitrogen

3.Carbon dioxide

4.Chlorofluorocarbons (CFCs)

Question: 
Which gas is used by plants during respiration?

1. Carbon dioxide

2.Oxygen

3.Nitrogen

4.Hydrogen

Question: 
Which gas supports combustion?

1.Oxygen

2.Carbon dioxide

3.Nitrogen

4.Helium

Question: 
Which metal is liquid at room temperature?

1.Iron

2.Copper

3.Mercury

4.Aluminum

Question: 
Which of the following elements is a metal?

1.Oxygen

2.Chlorine

3.Sodium

4.Nitrogen

Question: 
Which of the following is a characteristic of acids?

1.Sour taste

2.Bitter taste

3.Slippery feel

4.None of the above

Question: 
Which of the following is a chemical change?

1.Melting ice

2.Cutting paper

3. Burning wood

4.Dissolving salt in water

Question: 
Which of the following is a chemical change?

1.Melting of ice

2.Dissolving sugar in water

3.Burning of wood

4. Cutting paper

Question: 
Which of the following is a compound?

1.Hydrogen

2.Oxygen

3.Carbon

4.Water

Question: 
Which of the following is a greenhouse gas?

1.Oxygen

2.Nitrogen

3.Carbon dioxide

4.Hydrogen

Question: 
Which of the following is a greenhouse gas?

1.Oxygen

2.Carbon dioxide

3.Nitrogen

4.Helium

Question: 
Which of the following is a non-metal?

1.Iron

2.Silver

3.Gold

4.Carbon

Question: 
Which of the following is a product of photosynthesis?

1.Oxygen

2.Carbon dioxide

3.Water

4.Glucose

Question: 
Which of the following is a property of metals?

1.Brittleness

2.Dullness

3.Conductivity

4.Lack of luster

Question: 
Which of the following is a property of non-metals?

1.Malleability

2.Conductivity

3.Brittle

4.Shiny surface

Question: 
Which of the following is a pure substance?

1.Air

2.Water

3.Salt

4.Milk

Question: 
Which of the following is an example of a chemical reaction?

1.Cutting paper

2.Boiling water

3. Rusting of iron

4.Melting ice

Question: 
Which of the following is not a state of matter?

1.Solid

2.Gas

3.Plasma

4.Light

Question: 
Which of the following liquids has the highest viscosity?

1.Water

2.Honey

3.Vinegar

4.Milk

Question: 
Which state of matter has a definite shape and volume?

1.Solid

2.Liquid

3.Gas

4.Plasma

Question: 
Which substance is known as the universal solvent?

1.Water

2.Alcohol

3.Vinegar

4.Mercury

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