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SCIENCE MCQ TEST

Total questions: 126

Worksheet time: 2hrs 27mins

Name
Class
Date
1.

Q1.Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

a)

(a)1:1

b)

(b)2:1

c)

(c)4:1

d)

(d)1:2

2.
Which of the following is not a physical change?
a)
Boiling of water to give water vapour
b)
Melting of ice to give water
c)
Dissolution of salt in water
d)
Combustion of Liquefied Petroleum Gas (LPG)
3.
The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction
a)
(i) and (iv)
b)
(ii) and (iii)
c)
(i) and (iii)
d)
(iii) and (iv)
4.
Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)(i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent
a)
(i), (ii) and (iii)
b)
(iii) and (iv)
c)
(i), (ii) and (iv)
d)
(ii) and (iv)
5.
Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(iii) and (iv)
6.
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?(i) In beakers A and B, exothermic process has occurred. (ii) In beakers A and B, endothermic process has occurred. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred.
a)
(i) only
b)
(ii) only
c)
(i) and (iv)
d)
(ii) and (iii)
7.
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
a)
KMnO4 is an oxidising agent, it oxidises FeSO4
b)
FeSO4 acts as an oxidising agent and oxidises KMnO4
c)
The colour disappears due to dilution; no reaction is involved
d)
KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound.
8.
Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O
a)
(i) and (iv)
b)
(ii) only
c)
(i) and (ii)
d)
(iii) and (iv)
9.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
10.
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?(i) It is an endothermic reaction (ii) It is an exothermic reaction (iii) The pH of the resulting solution will be more than seven (iv) The pH of the resulting solution will be less than seven
a)
(a) (i) and (ii)
b)
(b) (ii) and (iii)
c)
(c) (i) and (iv)
d)
(d) (iii) and (iv)
11.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction
a)
(a) (i) only
b)
(b) (ii) only
c)
(c) (iv) only
d)
(d) (ii) and (iv)
12.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a)
(a) 1:1
b)
(b) 2:1
c)
(c) 4:1
d)
(d) 1:2
13.
Which of the following is(are) an endothermic process(es)? (i) Dilution of sulphuric acid(ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water
a)
(a) (i) and (iii)
b)
(b) (ii) only
c)
(c) (iii) only
d)
(d) (ii) and (iv)
14.
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
a)
(a) Lead sulphate (insoluble)
b)
(b) Lead acetate
c)
(c) Ammonium nitrate
d)
(d) Potassium sulphate
15.
14. Which of the following gases can be used for storage of fresh sample of an oil for a long time?
a)
(a) Carbon dioxide or oxygen
b)
(b) Nitrogen or oxygen
c)
(c) Carbon dioxide or helium
d)
(d) Helium or nitrogen
16.
Potassium Chlorate is heated in presence of catalyst to produce oxygen and potassium chloride.Which of the following statement(s) is(are) correct about the reaction?
a)
(a) It is a decomposition reaction and endothermic in nature
b)
(b) It is a combination reaction
c)
It is a decomposition reaction and accompanied by release of heat
d)
(d) It is a photochemical decomposition reaction and exothermic in nature
17.
Which one of the following processes involve chemical reactions?
a)
Storing of oxygen gas under pressure in a gas cylinder
b)
(b) Liquefaction of air
c)
(c) Keeping petrol in a china dish in the open
d)
(d) Heating copper wire in presence of air at high temperature
18.
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
a)
(a) 2H2(l) + O2(l) → 2H2O(g)
b)
(b) 2H2(g) + O2(l) → 2H2O(l)
c)
(c) 2H2(g) + O2(g) → 2H2O(l)
d)
(d) 2H2(g) + O2(g) → 2H2O(g)
19.
Which of the following are combination reactions?(i) 2KClO3⎯Heat⎯→ 2KCl + 3O2 (ii) MgO + H2O ⎯→ Mg(OH)2 (iii) 4Al + 3O2 ⎯→ 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe
a)
(a) (i) and (iii)
b)
(b) (iii) and (iv)
c)
(c) (ii) and (iv)
d)
(d) (ii) and (iii)
20.

Rancidity is a process in which fat/oils smell due to the change process of

a)

oxidation

b)

reduction

c)

displacement

d)

neutralization

21.

Colour of which metal changes to greem due to corrosion?

a)

Cu

b)

Al

c)

Fe

d)

Ag

22.
An extremely strong acid would have a pH of...
a)
1
b)
7
c)
9
d)
14
23.
An extremely strong base would have a pH of...
a)
1
b)
7
c)
9
d)
14
24.
A neutral substance would have pH of...
a)
8
b)
7
c)
6
d)
14
25.
If a solution is neither acidic or basic it has a pH of _____________.
a)
1
b)
13
c)
6
d)
7
26.
Indicators change color in the presence of a(n) _______________.
a)
acid or base
b)
buffer
c)
water molecule
d)
ester
27.
A base has a ___________ taste.
a)
bland
b)
salty
c)
bitter
d)
sour
28.

Acid is?

a)

A substance that reacts to metals and carbonates, and has a Ph of below 7.

b)

Often used in drain cleaner.

c)

Something that can only be found in a lab

d)

A bitter tasting substance

29.

A base is

a)

A substance that feels slippery, has a higher Ph than 7, and is often used in drain cleaner.

b)

Has a Ph of below 7 and can react to metal and carbonates

c)

Is only found in a lab

d)

Something water can never be

30.

An indicator is?

a)

A lab manual or guide

b)

Something like litmus paper that can tell you if a substance is acidic or basic

c)

A PS4 game where you pretend to direct traffic

d)

Something only scientists in a lab can use

31.

Do acids and bases conduct electricity?

a)

Only acids conduct electricity

b)

Only bases conduct electricity

c)

Bases and acids conduct electricity

d)

Neither conduct electricity

32.

When you neutralize acid with a base you create

a)

a Salt and water

b)

You can not neutralize acid with a base

c)

You create carbon dioxide

d)

A moderate sized explosion

33.

Which of these taste sour?

a)

acids

b)

bases

c)

salts

34.

Which of these feel slippery?

a)

bases

b)

acids

c)

salts

35.

Which of these turn red litmus paper blue?

a)

acids

b)

bases

c)

salts

36.

The pH scale is used to determine the strength of

a)

acids and bases

b)

chemical bonds

c)

electrical charges

d)

particles in a solution

37.

Chemicals formed when an acid and a base combine.

a)

salts

b)

noble gases

c)

metalloids

d)

hydroxides

38.

How would you best describe your science class this year?

a)

awesome

b)

very strange

c)

dull

39.
what happens when a solution of  an acid is mixed with a solution of a base in a test tube?a
a)
temperature of the solution increases 
b)
temperature of the solution decreases
c)
temperature remains constant
d)
no reaction
40.
calcium phosphate is present in tooth enamel its nature is
a)
basic
b)
acidic 
c)
neutral
d)
amphoteric
41.
To protect tooth decay we are advised to brush our teeth regurlarly.The toothpaste is
a)
acidic
b)
neutral
c)
basic
d)
corrosive
42.
Which of these is a property of metals?
a)
It's malleable
b)
It can't conduct electricity
c)
They are used in food
d)
It's very brittle
43.

All of the following would classify an element as a metal except?

a)

Dull

b)

Luster

c)

Malleable

d)

Ductile

44.
Which elements are found on the left to middle of The Periodic Table? 
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Candles
45.
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.
46.
When an object changes shape when struck by a hammer.
a)
luster
b)
malleable
c)
brittleness
d)
ductile
47.
If you have a material that can conduct electricity well it is probably a...
a)
Metalloid
b)
Matter
c)
Non-metal
d)
Metal
48.

Metals are found

a)

on the left side of the Periodic Table

b)

on the right side of the Periodic Table

c)

along the staircase (zig-zag line) on the Periodic Table

49.

By looking at the element illustrated here, how might you classify it by appearance?

a)

Metal

b)

Non-Metal

c)

Metalloid

50.

Which of the following is the only metal that exist as a liquid at room temperature?

a)

Gold (Au)

b)

Mercury (Hg)

c)

Titanium (Ti)

51.

Argon is a ____________ at room temperature.

a)

Gas

b)

Liquid

c)

Solid

52.

This picture illustrates copper's

a)

brittleness

b)

malleability

c)

ductility

53.

Metals create _________ ions, because they give away (lose) electrons.

a)

positive

b)

negative

c)

neutral

54.
What two conditions make iron rust
a)
Water only
b)
air only
c)
water and air
d)
Hydrochloric acid
55.
What element in air reacts with Iron to make Iron Oxide
a)
Carbon
b)
Oxigen
c)
Oxygen
d)
Nitrogen
56.
complete the word equation, Iron + Oxygen goes to
a)
Rust
b)
Iron Oxide
c)
Iron Dioxide
d)
Iron fluoride
57.
Iron is a good conductor, malleable and magnetic. What type of element is Iron? 
a)
Metal
b)
Nonmetal
c)
Metalloid
58.

Most metals are solid at room temperature

a)

False

b)

True

59.

The metal which can be cut with knife.

a)

Iron

b)

Silver

c)

Sodium

d)

Magnisium

60.

The metal which is the best conductor of heat.

a)

Iron

b)

Silver

c)

Potassium

d)

Sodium

61.

Which metal is the poor conductor of heat.

a)

Silver

b)

Potassium

c)

Mercury

d)

Iron

62.

The radius of curvature of a convex lens is 20cm. What is its focal length?

a)

10 cm

b)

20 cm

c)

30 cm

d)

40 cm

63.

Name the type of mirrors used in the following situations:

(i) Used by Dentist.

(ii) Rear-view mirror of vehicle

a)

(i) Diverging mirror

(ii) Converging mirror

b)

(i) & (ii) Both Converging mirror

c)

(i) Converging mirror

(ii) Diverging mirror

d)

(i) & (ii) Both Diverging mirror.

64.

In the given ray diagram, which of the following path of the refracted ray is correct?

a)
b)
c)
d)
65.

An object is kept at a distance of 4m in front of a spherical mirror, which forms its erect image at a distance of 1m

from the mirror. What is the magnification? Is the mirror concave or convex?

a)

m = +4

Concave Mirror

b)

m = -4

Convex mirror

c)

m = - 1/4

Convex Mirror

d)

m = +1/4

Convex Mirror

66.

A concave mirror produces a three times magnified image on a screen. If the object is placed 20cm in front of the mirror, What is the image distance?

a)

-20 cm

b)

-40cm

c)

-60 cm

d)

-10 cm

67.

Calculate the power of a lens whose focal length is +40 cm. Also Identify the nature of the lens.

a)

P = +0.25 D

Concave lens.

b)

P = +2.5 D

Convex lens

c)

P = +0.25 D

Concave lens

d)

P = +2.5 D

Convex Lens

68.

Complete the path of the refracted ray of the given incident light on the given convex lens.

a)
b)
c)
d)
69.

The image of a candle flame placed at a distance of 30cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60cm from its pole. What is the nature of the mirror? Find its focal length.

a)

F = - 20 cm

Concave Mirror

Real & Inverted Image

b)

F = + 20 cm

Concave Mirror

Virtual & Erect Image

c)

F = - 20 cm

Convex Mirror

Real & Inverted Image

d)

F = + 20 cm

Convex Mirror

Virtual & Erect Image

70.

A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

a)

Plane, convex and concave

b)

Convex, concave and plane

c)

Concave, plane and convex

d)

Convex, plane and concave

71.

The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively. If the speed of light in glass is 2 x 108 m/s, find the speed of light in water.

a)

0.5 x 108 m/s

b)

3 x 108 m/s

c)

2.25 x 108 m/s

d)

2 x 108 m/s

72.

A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also, find the magnification.

a)

u = + 30 cm

m = - 0.33

b)

u = + 20 cm

m = - 1.33

c)

u = - 20 cm

m = + 1.33

d)

u = - 30 cm

m = + 0.33

73.

A convex mirror used for rear view on an automobile has a radius of curvature of 3 m. If a bus is located at 5 m from this mirror. Find out the position, nature and size of the image.

a)

v = - 1.15 m

m = - 0.23

Virtual & Erect

b)

v = - 1.5 m

m = + 0.23

Real & Inverted

c)

v = + 1.5 m

m = + 2.3

Real & Inverted

d)

v = + 1.15 m

m = + 0.23

Virtual & Erect

74.

An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the nature, size and position of the image formed.

a)

v = - 6 cm

m = - 0.6

Real & Inverted

b)

v = + 6 cm

m = + 0.6

Virtual and Erect

c)

v = - 6 cm

m = - 0.6

Virtual and Erect

d)

v = + 6 cm

m = + 0.6

Real & Inverted

75.

Which of the following lenses would you prefer to use while reading small letters of newspaper?

a)

A convex lens of focal length 50 cm.

b)

A concave lens of focal length 5 cm.

c)

A concave lens of focal length 50 cm.

d)

A convex lens of focal length 5 cm.

76.

An object 5 cm in size is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 40 cm. Find out the position, size and nature of the image formed.

a)

v = + 10 cm

h' = + 2.5 cm

Virtual, Erect and smaller in size.

b)

v = - 20 cm

h' = - 0.5 cm

Real, Inverted and enlarge in size.

c)

v = + 20 cm

h' = + 0.5 cm

Real, Inverted and enlarge in size.

d)

v = - 10 cm

h' = - 2.5 cm

Virtual, Erect and smaller in size.

77.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
78.

Electric current is defined as

a)

detect electric current

b)

negative terminal to positive terminal

c)

positive terminal to negative terminal

d)

the flow rate of electric charges through a conductor

79.

What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 C?

a)

30 A

b)

0.3 A

c)

0.5 A

d)

5 A

80.

Calculate the number of electrons constituting one coulomb of charge.

(Hint: e =1.6 × 10^-19 C)

4 lines
81.

A current of 1 A is drawn by a filament of an electric bulb. Calculate the number of electrons passing through a cross-section of the filament in 16 s.

(Hint: I = Q/t and Q = ne)

4 lines
82.

which of the following represents voltage?

a)

Work done / (current x time)

b)

work done x charge

c)

(wordone x time) / current

d)

work done x charge x time

83.

When an electrochemical cell no longer works, it is out of charge and must be recharged before it can be used again.

a)

True

b)

False

84.

An electrochemical cell can be a source of charge in a circuit. The charge that flows through the circuit originates in the cell.

a)

True

b)

False

c)

Partly true

85.

Charge becomes used up as it flows through a circuit. The amount of charge that exits a light bulb is less than the amount that enters the light bulb.

a)

True

b)

False

86.

The local electrical utility company supplies millions and millions of electrons to our homes everyday.

a)

True

b)

False

87.

Charge flows through circuits at very high speeds. This explains why the light bulb turns on immediately after the wall switch is flipped

a)

True

b)

False

88.

When electric current is passed, electrons move from:

a)

high potential to low potential.

b)

low potential to high potential.

c)

in the direction of the current.

d)

against the direction of current

89.

The heating element of an electric iron is made up of:

a)

copper

b)

aluminium

c)

nichrome

d)

iron

90.

The electrical resistance of insulators is

a)

high

b)

low

c)

zero

d)

infinity

91.

Electrical resistivity of any given metallic wire depends upon

a)

its thickness

b)

its shape

c)

nature of the material

d)

its length

92.

Electric power is inversely proportional to

a)

resistance

b)

voltage

c)

current

d)

temperature

93.

What is the commercial unit of electrical energy?

a)

Joules

b)

Kilojoules

c)

Kilowatt-hour

d)

watt-hour

94.

Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be

a)

greater than 3 Ω

b)

less than 1 Ω

c)

equal to 2 Ω

d)

zero

95.

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

a)

440 V

b)

220 V

c)

110 V

d)

55 V

96.

Which of the following gases are filled in electric bulbs?

a)

Helium and Neon

b)

Neon and Argon

c)

Argon and Hydrogen

d)

Argon and Nitrogen

97.

100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:

a)

30 V

b)

10 V

c)

20 V

d)

25 V

98.

Coulomb is the SI unit of:

a)

charge

b)

current

c)

resistance

d)

potential difference

99.

A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure (i), (ii) and (iii). The current recorded in the ammeter will be

a)

maximum in (i)

b)

maximum in (ii)

c)

maximum in (iii)

d)

will be same in all the cases

100.

Materials which allow larger currents to flow through them are called

a)

insulators

b)

conductors

c)

semiconductors

d)

alloys

101.

Conventionally, the direction of the current is taken as

a)

the direction of flow of negative charge

b)

the direction of flow of atoms

c)

the direction of flow of molecules

d)

the direction of flow of positive charge

102.

The slope of voltage (V) versus current (I) is called

a)

resistance

b)

conductance

c)

resistivity

d)

conductivity

103.

An electric iron draws a current 4 A when connected to a 220 V mains. Its resistance must be

a)

1000 Ω

b)

55 Ω

c)

44 Ω

d)

none of these

104.

 Calculate the current flows through the 10 Ω resistor in the following circuit. 

a)

1.2 A

b)

0.6 A

c)

0.2 A

d)

2.0 A

105.

A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of

a)

more length

b)

less radius

c)

less length

d)

more radius

106.

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is high ?

a)

R1 = R2 = R3

b)

R1 > R2 > R3

c)

R3 > R2 > R1

d)

none of these

107.

A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is

a)

2 A

b)

4 A

c)

8 A

d)

16 A

108.
A cell's control center that directs all of the activities that take place in the cell is the
a)
Chromosome
b)
Vacuole
c)
Nucleus
d)
Mitochondria
109.
Found only in plant cells, this organelle enables the plant to make its own food through the process of photosynthesis.
a)
Cytoplasm
b)
Cell Wall
c)
Chloroplast
d)
Mitochondria
110.

Full form of ATP

a)

Adenosinetriphosphate

b)

Adenosidiphosphate

c)

Adrenalin

d)

Adoxide

111.

The blood vessels which carry oxygenated blood

a)

Vein

b)

Artery

c)

Both

d)

None

112.
What is the name of the "plant food" produced by photosynthesis?
a)
glucose
b)
carbohydrates
c)
chloroplast
d)
lunch
113.
What gas does a plant take IN for photosynthesis
a)
oxygen
b)
nitrogen
c)
carbon dioxide
d)
helium
114.
 What is the main function or job of the organ system displayed?
a)
To store food until it is absorbed into the lungs
b)
To convert and breakdown food into nutrients and energy to be absorbed into the circulatory system
c)
To provide the body with structure
d)
TO eliminate liquid waste
115.
Which organ pumps blood throughout your body?
a)
cell
b)
brain
c)
tissue
d)
heart
116.

The valve present between right atrium and right ventricle.

a)

tricuspid

b)

bicuspid

c)

pulmonary

d)

aortic

117.

It is the site of gaseous exchange in human lungs.

a)

villi

b)

alveoli

c)

trachea

d)

larynx

118.

In unicellular organisms like amoeba gaseous exchange takes place through the process of ____________.

a)

osmosis

b)

transportation

c)

diffusion

d)

elimination

119.

The substance in plants and animals that act as an energy currency.

a)

DNA

b)

RNA

c)

ADP

d)

ATP

120.

_______________ is the final product of glycolysis.

a)

carbon dioxide

b)

ATP

c)

Pyruvic acid

d)

acetyl coA

121.

Glycolysis takes place in the __________ of the cell.

a)

mitochondria

b)

ribosomes

c)

cytoplasm

d)

Golgi complex

122.

_________________ artery carries deoxygenated blood.

a)

aortic

b)

pulmonary

c)

renal

d)

inferior

123.

chloroplasts are present in the ___________ of the leaf.

a)

palisade parenchyma

b)

aerenchyma

c)

sclrenchyma

d)

collenchyma

124.

in plants food is stored i the form of

a)

glycogen

b)

starch

c)

maltose

d)

glucose

125.

The waste product generated during photosynthesis is

a)

carbon dioxide

b)

oxygen

c)

nitrogen

d)

water

126.

In plants waste products are stored as ------ and --------

a)

water and glucose

b)

glycogen and starch

c)

resins and gums

d)

starch and water

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