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CLASS 10 SCIENCE

Total questions: 60

Worksheet time: 45mins

Name
Class
Date
1.

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

a)

Make the ribbon surface shinier

b)

Remove the layer of magnesium oxide from the ribbon surface

c)

Remove the layer of magnesium carbonate from the ribbon surface

d)

Remove the moisture from the ribbon surface

2.

In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:

a)

Hydrochloric acid

b)

Barium sulphate

c)

Chlorine

d)

Sulphur

3.

The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:

a)

Exothermic process

b)

Endothermic process

c)

Reversible process

d)

Physical process

4.

A chemical reaction does not involve:

a)

Formation of new substances having entirely different properties than that of the reactants

b)

Breaking of old chemical bonds and formation of new chemical bonds

c)

Rearrangement of the atoms of reactants to form new products

d)

Changing of the atoms of on element into those of another element to form new products

5.

One of the following processes does not involve a chemical reaction. That is:

a)

Melting of candle wax when heated

b)

Burning of candle wax when heated

c)

Digestion of food in our stomach

d)

Ripening of banana

6.

It is necessary to balance a chemical equation in order to satisfy the law of:

a)

Conservation of motion

b)

Conservation of momentum

c)

Conservation of energy

d)

Conservation of mass

7.

All the methods mentioned below can be used to prevent the food from getting rancid except:

i. Storing the food in the air-tight containers

ii. Storing the food in refrigerator

iii. Keeping the food in clean and covered containers

iv. Always touching the food with clean hands

a)

(i) and (ii)

b)

(i) and (iii)

c)

(i), (iii) and (iv)

d)

(iii) and (iv)

8.

Rusting of iron involves a chemical reaction which is a combination of:

a)

Reduction as well as combination reactions

b)

Oxidation as well as combination reactions

c)

Reduction as well as displacement reactions

d)

Oxidation as well as displacement reactions

9.

The given chemical reaction represents:

a)

Combination reaction as well as double displacement reaction

b)

Redox reaction as well as displacement reaction

c)

Double displacement reaction as well as redox reaction

d)

Decomposition reaction as well as displacement reaction

10.

When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

a)

Blue to green

b)

Green to blue

c)

Green to brown

d)

Green to yellow

11.

Which of the following gases is used in the storage of fat and oil containing foods for a long time?

a)

Carbondioxide gas

b)

Nitrogen gas

c)

Oxygen gas

d)

Neon gas

12.

The given diagram of experimental set-up is used to carry out:

a)

Distillation of water

b)

Purification of water

c)

Electrolysis of water

d)

Hydrolysis

13.

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

a)

Copper granules

b)

Magnesium ribbon

c)

Sodium pellets

d)

Aluminium dust

14.

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

a)

Copper granules

b)

Magnesium ribbon

c)

Sodium pellets

d)

Aluminium dust

15.

The neutralization reaction between an acid and a base is a type of:

a)

Double displacement reaction

b)

Displacement reaction

c)

Addition reaction

d)

Decomposition reaction

16.

The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given. The reducing and oxidizing agents involved in this redox reaction are:

a)

Iodine and sulphur respectively

b)

Iodine and hydrogen sulphide respectively

c)

Sulphur and iodine respectively

d)

Hydrogen sulphide and sulphur

17.

Which of the following does not corrode when exposed to the atmosphere-

a)

Iron

b)

Copper

c)

Gold

d)

Silver

18.

Rusting of an iron is an example of

a)

Reduction

b)

Ionization

c)

Oxidation

d)

Dissociation

19.

Combination of phosphorus and oxygen is an example of:

a)

Oxidation

b)

Reduction

c)

Rancidity

d)

None of these

20.

The reaction in which two compounds exchange their ions to form two new compounds is

a)

A displacement reaction

b)

A decomposition reaction

c)

An isomerization reaction

d)

A double displacement reaction

21.

A substance which oxidized itself and reduces other is known as :

a)

Oxidizing agent

b)

Reducing agent

c)

Both of these

d)

None of these

22.
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
23.
an aqueous soln turns red lithmus blue . excess addition of which of the following would reverse the change
a)
baking powder
b)
lime
c)
ammonium hydroxide solution
d)
HCL
24.
calcium phosphate is present in tooth enamel its nature is
a)
basic
b)
acidic 
c)
neutral
d)
amphoteric
25.
a sample of soil is mixed with water and allow to settle . The soln turns yellowish orange which of the foll soln will turn the colour to greenish blue 
a)
lemon juice
b)
vinegar
c)
common salt
d)
antacid
26.
If a few drops of concentrated acid accidentally spills over the hand of a student,what should be done
a)
wash the hand with saline solution
b)
wash the hand immediately with plenty of water and apply a soln of sodium hydrogen carbonate
c)
after washing apply soln of sodium hydroxide
d)
neutralise the acid wih a strong alkali
27.
common salt besides being used in kitchen can also be used as the raw material for making
a)
washing soda
b)
calcium salts
c)
plaster of paris
d)
slaked lime
28.
sodium hydrogen carbonate when added to acetic acid evolves  a gas .which of the statement is true about the gas evolved
a)
it turns lime water milky
b)
it burns with a pop sound
c)
it changes the soln colorless
d)
it has a pungent smell
29.
To protect tooth decay we are advised to brush our teeth regurlarly.The toothpaste is
a)
acidic
b)
neutral
c)
basic
d)
corrosive
30.
which of the foll phenomena occur when a small amunt of acid is added to water
a)
ionisation
b)
neutralisation
c)
dilution
d)
formation
31.
which of the foll substances will not give carbon dioxide on treatment with dilute acid
a)
marble
b)
limestone
c)
baking soda
d)
lime
32.
Which of the foll statement is not correct and CO2
a)
all metal carbonates react with acid to give a salt,water and CO2
b)
all metal oxides react with water to give salt and acid
c)
some metals react with acids to give salt and H2
d)
some non metal oxides react with water to form an acid
33.

HCl is found in household products, including some toilet bowl cleaners. Is HCl an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

34.

True or false: a neutral solution has equal amounts of H+ and OH-.

a)

True

b)

False

35.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

36.

A substance is found to have the following characteristics:


Very bitter taste

Feels soapy to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

37.

Acids are substances that release H+ ions when dissolved in water.

a)

True

b)

False

38.

Alkalis are substances that produce OH- ion when dissolved in water.

a)

True

b)

False

39.

Type of element is a semiconductor

a)

metal

b)

nonmetal

c)

metalloid

40.
Which of the given choices correctly shows the three main groups of elements listed from least conductivity to greatest conductivity?
a)
Metals, Nonmetals, Metalloids
b)
Nonmetals, Metalloids, Metals
c)
Metalloids, Metals, Nonmetals
d)
Nonmetals, Metals, Metalloids 
41.
Aluminum can be hammered into different shapes or rolled into flat sheets. This means Aluminum is 
a)
ductile
b)
malleable
c)
lustrous
d)
high density
42.

This type of element loses its valence electrons easily.

a)

metal

b)

nonmetal

c)

metalloid

43.
If a substance breaks easily, it is said to be ________________.
a)
A. Magnetic
b)
B. Brittle
c)
C. Conductive
d)
D. Ductile
44.
If a material can easily be drawn into the shape of a wire, it is
a)
Ductile
b)
Magnetic
c)
Malleable
d)
Reactive
45.
At room temperature metals are ____________.
a)
plasma
b)
gases
c)
liquid
d)
solid
46.
Fluorine is used in many tooth pastes because it helps maintain healthy teeth.  At room temperature it is gaseous, and does not conduct electricity. Based off these properties, it would be classified as?
a)
A metal
b)
A non metal
c)
A metalloid
47.

Argon is a ____________ at room temperature.

a)

Gas

b)

Liquid

c)

Solid

48.

Which metal is the poor conductor of heat.

a)

Silver

b)

Potassium

c)

Mercury

d)

Iron

49.

Metals & Nonmetals elements form

a)

Ionic compound

b)

Covalent compound

c)

both a & b

50.

Which of the following represent the correct order of decreasing reactivity?

a)

Mg > Al > Zn > Fe

b)

Mg > Zn > Al > Fe

c)

Al > Zn > Fe > Mg

d)

Mg > Fe > Zn > Al

51.

An element X is soft and can be cut with the help of a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following

a)

Mg

b)

Na

c)

Al

d)

Au

52.

Which of tire following are not ionic compounds?

(i) KCl

(ii) HCl

(iii) CCl4

(iv) NaCl

a)

(a) (i) and (ii)

b)

(b) (ii) and (iii)

c)

(c) (iii) and (iv)

d)

(d) (i) and (iii)

53.

The electronic configuration of three elements X, Y and Z are as follows:

X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,

a)

(a) X2Y

b)

(b) YZ

c)

(c) XZ3

d)

(d) Y2Z

54.

Example of an amphoteric oxide is:

a)

(a) Na2O

b)

(b) K2O

c)

(C) Al2O3

d)

(d) MgO

55.

Which one of the following metals do not react with cold as well as hot water?

a)

Na

b)

Ca

c)

Mg

d)

Fe

56.

What happens when calcium is treated with water?

(i) It does not react with water

(ii) It reacts violently with water

(iii) It reacts less violently with water

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

a)

(a) (i) and (iv)

b)

(b) (ii) and (iii)

c)

(c) (i) and (ii)

d)

(d) (iii) and (iv)

57.

Two statement are made

Statement A: Conductivity of a metal is due to presence of free electrons

Statement B: Metals conducts heat

a)

(a) Statement A is correct only

b)

(b) Statement B is correct only

c)

(c) Statement A and B both are correct

d)

(d) Statement A and B both are incorrect

58.

Which metal can be displaced by copper from its salt solution?

a)

(a)Sodium

b)

(b) Zinc

c)

(c) Iron

d)

(d) Silver

59.

In general, the number of electrons in the outermost shell of a metal atom is

a)

(a) 1

b)

(b) 1 to 3

c)

(c) 5 to 8

d)

(d) 8

60.

A chemical equation is said to be balanced if number of

a)

(i) Compounds are same in both side

b)

(ii) Molecules are same in both side

c)

(iii) Number of atoms is same in both side

d)

(iv) Number of electrons are same in both side

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