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

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 of ice

2.Dissolving sugar in water

3.Burning of wood

4. Cutting paper


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 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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