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7th Term 1 and term 2

Total questions: 101

Worksheet time: 1hrs 12mins

Name
Class
Date
1.

Myra was given a mixture to separate by physical processes. What is the mixture?

a)

Pure Substance

b)

Glucose

c)

Element

d)

Mixture

2.

A science teacher, Ms. Smith, is conducting an experiment to demonstrate different types of mixtures. She prepares a mixture that is NOT evenly distributed. What is this type of mixture called?

a)

Compounded

b)

Homogenous

c)

Heterogenous

d)

Salty

3.
This picture represents: 
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
4.

All students in the class are learning about the basic building blocks of matter. According to their teacher, all matter is made up of .....

a)

Compounds

b)

Atoms

c)

Molecules

d)

Sunshine

5.
Which of the following would you use to separate sand from iron?
a)
a bar magnet
b)
paper
c)
hot plate
6.

A science teacher asked the class to identify a homogeneous mixture of particles so small that they can not be seen with a microscope and that will never settle to the bottom of their container. What is the correct answer?

a)

colloid

b)

solution

c)

suspension

d)

tyndall effect

7.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
8.
H2 would be a .....
a)
Molecule
b)
Compound
c)
Solid
d)
Problem
9.

If Navya changes a substance into a new substance...

a)

Partial Change

b)

Physical Change

c)

Chemical Change

d)

Freezing

10.

Which of the following is an example of a physical change?

a)

Sampanyasri changing her hairstyle

b)

Aanya baking a cake

c)

Garg digesting lunch

d)

Ice melting

11.
Which of the following is not a homogeneous mixture?
a)
orange juice
b)
vinegar
c)
soft drinks
d)
pool water
12.
A _________________ is a substance made of 2 or more elements that are chemically combined in a set ratio. 
a)
compound
b)
element
c)
atom
d)
chemical bond
13.

A real-world scenario where a Singh is commonly found is in a fruit salad, which is made of 2 or more substances that are together in the same place, but their atoms are not chemically bonded. 

a)

chemical bond

b)

mixture

c)

molecule

d)

atom

14.
An ______________ is a substance that cannot be broken down. 
a)
element
b)
molecule
c)
chemical bond
15.
An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated
a)
The molecules will begin to move slower.
b)
The molecules will begin to move faster
c)
The molecules will begin to increase in density
d)
The molecules will begin to condense in the air.
16.

Physical or chemical change?
When Nandini bakes a cookie dough into cookies, is it a physical change or a chemical change?

a)

physical change 

b)

chemical change 

17.

Define a Chemical Property in the context of a science experiment

a)

A property which depends on the objects size or matter.

b)

A property of matter not involving in its manifestation a chemical change

c)

A property or behavior of a substance which undergoes a chemical change or reaction.

d)

A property which makes the object smell or taste different.

18.

At a science fair, Misra conducted an experiment to study the behavior of particles in different objects. She observed that at higher temperatures,

a)

particles in an object have less energy

b)

particles in an object move faster

c)

a gas contracts

19.

During a science experiment, Singh was asked to determine the number of electrons in a sodium atom. How many electrons does a sodium atom have?

a)

23

b)

11

c)

12

d)

34

20.

Charisha, Deshwal, Sampanyasri, Saanvi, and Garg were studying the properties of an element. The mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.

a)

12.5

b)

13

c)

25

d)

37

21.

What is the correct number of subatomic particles of a phosphorous atom with a mass of 31?

a)

p# - 15, n# = 15, e# = 15

b)

p# - 15, n# = 16, e# = 15

c)

p# - 15, n# = 15, e# = 16

d)

p# - 16, n# = 15, e# = 15

22.

What is the mass number of a nickel atom with 28 protons, 31 neutrons, and 28 electrons?

a)

31

b)

28

c)

59

d)

87

23.

How many electrons does the atom of a particular element have?

a)

2

b)

4

c)

6

d)

10

24.
Discovered the neutron within the atom
a)
Democritus
b)
Thomson
c)
Rutherford
d)
Chadwick
25.

Who among the following created the Planetary Model of the atom?

a)

Bohr

b)

Dalton

c)

Rutherford

d)

Chadwick

26.

Who discovered the electron within the atom?

a)

Thomson

b)

Chadwick 

c)

Schrodinger & Heisenberg

d)

Dalton

27.

Which of the following elements is the only one with no neutrons in its nucleus?

a)

Oxygen

b)

Helium 

c)

Hydrogen

d)

Lithium

28.

What do the following properties describe in the context of metals? : shiny, ductile, good conductor, high melting point

a)

metal

b)

nonmetal

c)

metalloid

29.

During a science experiment, Deshwal observed that when the alkali metals react with water, which gas is released?

a)

hydrogen

b)

oxygen

c)

hydroxide

d)

carbon dioxide

30.

What happens to the reactivity of the alkali metals as you move down the group?

a)

increases

b)

decreases

31.

Which of the following is TRUE about an isotope?

a)

same number of protons and neutrons

b)

same number of protons but different number of neutrons

c)

same atomic mass but different atomic number

d)

neutron and electron numbers are the same

32.

In a nuclear power plant, the technicians are discussing the order of most to least penetrating radiation. What is the correct order?

a)

Alpha , Beta,  Gamma

b)

Beta , Gamma , Alpha

c)

Gamma, Beta, Alpha

d)

Gamma, Alpha, Beta

33.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
34.
Based on the # of valence electrons, which element does this Lewis dot symbol represent?
a)
Argon (Ar)
b)
Chlorine (Cl)
c)
Magnesium (Mg)
d)
Sulfur (S)
35.

According to Arrhenius, which ion does acid generate in water?

a)

H+

b)

OH_

c)

Cl-

d)

F_

36.

Which of the following reaction produces a base?

a)

Reaction between metal and oxygen

b)

Reaction between a metal oxide and water

c)

Reaction between an acid and a base

d)

Heating of metal carbonates

37.

Which of the given compounds is commonly used in baking and has the formula NaHCO3?

a)

Vinegar

b)

washing soda

c)

Caustic Soda

d)

baking soda

38.

In a chemistry experiment, Aman observed that HCl gas changes the colour of the litmus paper.

a)

True

b)

False

39.

Choose the correct option regarding the statements given below:

Statement 1: Kathrine always wears a red dress on Mondays.

Statement 2: Misra always wears a blue dress on Fridays.

Statement 3: Vihaan always wears a green dress on Wednesdays.

Statement 4: Garg always wears a yellow dress on Saturdays.

a)

Misra and Vihaan always wear their favorite colors on the specified days

b)

Kathrine and Vihaan always wear their favorite colors on the specified days

c)

Kathrine and Misra always wear their favorite colors on the specified days

d)

Misra and Kathrine always wear their favorite colors on the specified days

40.

During a chemistry class experiment, Vihaan, Garg, and Maggu were asked to identify the weakest acid among the following options. Which one of the following is the weakest acid?

a)

HF

b)

HCl

c)

HBr

d)

HI

41.

Analyze the reaction given below and identify the salt formed.FeO (aq) + HCl (aq)→Salt + H2O (l)

a)

FeO

b)

FeCl2

c)

Fe2O3

d)

FeSO4

42.

When Singh, Shrivats, Nandini, Shatanya, and Aman sit around a campfire, they feel the warmth from the fire. This type of reaction occurs when a substance absorbs thermal energy from its surroundings.

a)

endothermic

b)

exothermic

c)

decomposition

d)

synthesis

43.

Which chemical turns blue litmus paper red when exposed to an acidic solution?

a)

Acid

b)

Base

44.

What is the name of the acid King of chemicals?

a)

Hydrochloride acid

b)

Sulfuric acid

c)

Nitric acid

d)

Carbonic acid

45.

What is the common name of CaSO4 2H2O in the construction industry?

a)

Epsom Salt

b)

Blue vitrol

c)

Gypsum

d)

Plaster of Paris

46.

Chemical formula of the disinfectant used in Daksh's house.

a)

CaOCl2

b)

CaCl2

c)

CaSO4

d)

Ca(OH)2

47.

During a dental check-up, Dr. Smith asked the students about the composition of tooth enamel. What is tooth enamel made up of?

a)

calcium phosphate

b)

calcium carbonate

c)

calcium oxide

d)

potassium

48.

In a chemistry class, Maggu asked her teacher, 'What is ignition temperature?' The teacher explained that it is the lowest temperature at which a substance catches fire without the need for an external flame or spark. What is ignition temperature?

a)

Lowest temperature at catch fire

b)

Higher temperature at catch fire

c)

Any temperature

d)

1000 C

49.

In a real-world scenario, which type of fuel would have the highest calorific value?

a)

Zero

b)

Low

c)

Moderate

d)

High

50.

During a candle making workshop, Navya was observing the different zones of a candle flame. She noticed that the least hot zone of a candle flame is

a)

non-lumious zone

b)

luminous

c)

dark zone

d)

blue zone at the base of the wick

51.
Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?
a)
Water
b)
Carbon Dioxide 
c)
Dry Chemical
d)
Foam
52.

matchstick catch fire?

a)

By rubbing a matchstick against a rough surface

b)

By attaining the ignition temperature

c)

None of the above

d)

all of the above

53.

Unburnt carbon particles causes

a)

Stomach infection

b)

Respiratory problems

c)

Brain infections

d)

Throat problems

54.

When magnesium ribbon burnt it produce

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

55.

Which one of the following is combustible?

a)

Iron nail

b)

Glass

c)

Stone pieces

d)

Paper

56.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

57.

Fire extinguisher-

a)

Raise up temperature of fuel

b)

Bring down the temperature of fuel

c)

Cut off the supply of air

d)

None of these

58.
Water is not used to control fires involving electrical appliances.
a)
False
b)
True
59.
Which of the following fuel has highest calorific value?
a)
Wood
b)
coal
c)
Hydrogen
d)
petrol
60.

he picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.

a)

Case 1

b)

case 2

c)

Both case 1 and case 2

d)

D. The paper doesn’t burn in both the cases.

61.

What colours are the outer zone of the flame? (Pick two)

a)

Colourless

b)

Blue

c)

Red

d)

Orange

62.

What does this hazard symbol warn of?

a)

The substance is explosive

b)

The substance burns easily

c)

The substance supplies oxygen to fires

d)

The substance puts out fires

63.

Why should you not add water on burning oil?

a)

It makes the fire explode and spread.

b)

It puts the fire out too quickly

c)

Water does not put out fires

d)

It takes too long to put out the fire

64.
Wood is a better fuel than LPG.
a)
True
b)
False
65.
Complete combustion is when there is plenty of oxygen to react with. 
a)
True
b)
False
66.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
67.

Which one of the following is fuel of our body?

a)

Petrol

b)

Diesel

c)

Water

d)

Food

68.

How are you feeling today?

a)

Happy/Joyful

b)

Bored

c)

Angry

d)

Worried

e)

Sad

69.

What was on the spoon after it was passed over the flame?

a)

oxygen

b)

there is no spoon

c)

fire

d)

water

70.

Which candle's flame went out fastest?

a)

medium

b)

largest

c)

smallest

71.

The products of an acid - metal reaction are:

a)

carbon dioxide + water

b)

salt + hydrogen

c)

salt + water

d)

salt + carbon dioxide + water

72.

The products of an acid - metal carbonate reaction are:

a)

carbon dioxide + water

b)

salt + hydrogen

c)

salt + water

d)

salt + carbon dioxide + water

73.

The products of the combustion of a fuel are:

a)

carbon dioxide + water

b)

salt + hydrogen

c)

salt + water

d)

salt + carbon dioxide + water

74.

A reaction that breaks down a larger molecule into smaller molecules.

a)

corrosion

b)

combustion

c)

decomposition

d)

neutralisation

75.

The positive gas test result for a lit splint in hydrogen is:

a)

a squeaky pop

b)

the flame will reignite

c)

the flame will extinguish

d)

no change

76.

The positive gas test result for a lit splint in carbon dioxide is:

a)

a squeaky pop

b)

the flame will reignite

c)

the flame will extinguish

d)

no change

77.

The positive gas test result for a glowing splint in oxygen is:

a)

a squeaky pop

b)

the flame will reignite

c)

the flame will extinguish

d)

no change

78.

Which acid is used to produce the salt copper sulphate?

a)

hydrochloric acid

b)

sulphuric acid

c)

nitric acid

d)

acetic acid

79.

Which acid is used to produce the salt magnesium nitrate?

a)

hydrochloric acid

b)

sulphuric acid

c)

nitric acid

d)

acetic acid

80.

Coal burns with__________

a)

Flame

b)

Only Glow

c)

Both flame & glow

d)

None of these

81.

Combustion is a ____________

a)

Physical process

b)

Chemical process

c)

Both of these processes

d)

None of these

82.

There are following zones of flame

a)

Two

b)

Four

c)

Three

d)

No zone

83.

The substance which have very low ignition temperature will

a)

Catch fire easily

b)

Will not catch fire

c)

Catch fire after sometime

d)

None of these

84.

Burning of charcoal in room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

All of these

85.

The amount of heat energy produced on complete combustion of 1 kg of fuel is called

a)

Calorific value

b)

Significant value

c)

Heat value

d)

Internal value

86.

Substance that does not burn in air is

a)

Sand

b)

Kerosene

c)

Wood

d)

Diesel

87.

Which zone represent the partial (half) combustion in candle flame

a)

Outer zone

b)

Middle zone

c)

Inner zone

d)

Lower zone

88.

The acronym for putting out a fire using a fire extinguisher is PASS . What does PASS stands for

a)

Pull, aim, squeeze, spread

b)

Pul, accuracy, squeeze, spread

c)

Pin, aim, squeeze, sweep

d)

Pull, aim, squeeze, sweep

89.

A Class 'A' fire is composed of_____fuels?

a)

Liquids

b)

Solids

c)

Gasses

d)

Metals

90.

Smoke contains the following components

a)

Nuclear, Chemicals and Mechanical sources of heat

b)

Zinc, Magnesium, sulfur, copper and hydrogen

c)

Particles of carbon monoxide, carbon dioxide, sulfur dioxide and cyanide

d)

Cheshire cats, caterpillars and white rabbits

91.

Fire has changed over time

a)

true

b)

false

c)

both

d)

neither

92.

Smoke contains the following components

a)

Nuclear, Chemicals and Mechanical sources of heat

b)

Zinc, Magnesium, sulfur, copper and hydrogen

c)

Particles of carbon monoxide, carbon dioxide, sulfur dioxide and cyanide

d)

Cheshire cats, caterpillars and white rabbits

93.

A class 'C' fire can be additionally dangerous because it involves...?

a)

low level of hydrogen

b)

electricity

c)

combustible liquids

d)

inserts

94.

Dry powder extinguishers _______ the chain reaction process

a)

convert

b)

speed up

c)

interrupt

d)

alter

95.

Fire sprinklers do not react to smoke

a)

true

b)

false

c)

both, true and false

96.

What is required for photosynthesis?

a)

sugar and oxygen

b)

carbon dioxide and oxygen

c)

sugar and water

d)

carbon dioxide and water

97.
Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table . Based on these observations, which sample is most likely a nonmetal?
a)
Sample 1
b)
Sample 2
c)
Sample 3
d)
Sample 4
98.
Describe what luster means
a)
How an object reflects light
b)
How soft an object is
c)
If an object floats
d)
If an object can be dug out of the earth.
99.

Metal oxides are

a)

Basic

b)

Acidic

c)

Neutral

d)

None of the above

100.

More reactive metal displaces less reactive metal from its salt solution is known as

a)

Combination reaction

b)

Displacement reaction

c)

Neutral reaction

d)

None of the above

101.

Colour of iron sulphate is

a)

Blue

b)

Green

c)

Black

d)

None of the above

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