CBSE Class 10th Science Mix Test

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CBSE Class 10th Science Mix Test - 10

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Question 1
1 / -0

Find the focal length of a convex mirror whose radius of curvature is 32 cm ?

A
16 cm

B
20 cm

C
32 cm

D
infinite

Solution

We have, f = \(\frac{R}{2}=\frac{32}{2}=16cm\)
Question 2
1 / -0

A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it. The position of image is :

A
30 cm behind the mirror

B
30 cm in front of the mirror

C
20 cm behind the mirror

D
None

Solution

We have, m = 3

u = -10 cm

\(\therefore\) m = \(\frac{-v}{u}\)

or, 3 = \(\frac{(-v)}{(-10)}\)

Or, ν = 30 cm

Thus, the image is formed at distance of 30 cm behind the mirror.
Question 3
1 / -0

Assertion (A): The process of copying the DNA will have some variations each time.

Reasons (R): No bio- chemical reaction is absolutely reliable.

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false.

D
A is false, but R is true
Question 4
1 / -0

Assertion (A): The micro- organisms, comprising bacteria and fungi, breakdown the dead remains and waste products of organisms.

Reasons (R): Decomposers break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants.

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false.

D
A is false, but R is true.
Question 5
1 / -0

Assertion (A): In Newlands’s octaves, the properties of lithium and sodium were found to be same.

Reasons (R): Sodium is the eighth element after lithium.

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false.

D
A is false, but R is true.
Question 6
1 / -0

Light enters from air to glass having refractive index 1.5.Then, the speed of light in the glass is :

A
\(3\times 10^8 m/s\)

B
\(2\times 10^8m/s\)

C
\(1.5\times 10^8m/s\)

D
\(None\)

Solution

Given: speed of light in vacuum(c) = \(3\times 10^8m/s\)

Refractive index of glass \((\mu_g)\) = 1.50

We have,

Speed of light in glass (ν) = \(\frac{c}{\mu g}=\frac{3\times 10^8}{1.50}\)

\(\therefore\) v = \(2\times 10^8m/s\)
Question 7
1 / -0

A concave lens has a 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 ?

A
40 cm

B
25 cm

C
30 cm

D
32 cm.

Solution

Here, focal length, f = -15 cm

Distance of image, ν = -10 cm

From lens formula, \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\)

\(\therefore\) \(\frac{1}{u}=\frac{1}{v}-\frac{1}{f}\) = \(-\frac{1}{10}-\left(\frac{1}{-15}\right) \)

= \(\frac{1}{15}-\frac{1}{10}\)

\(\therefore\) u = -30 cm

So, the object is placed 30 cm away from the concave lens.
Question 8
1 / -0

The length and complexity of food chains vary greatly. Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So, instead of a straight-line food chain, the relationship can be shown as a series of branching lines called a food web.

The greatest number in trophic levels of food chain is of:

A
Producers

B
Primary consumers

C
Secondary consumers

D
Tertiary consumers
Question 9
1 / -0

The length and complexity of food chains vary greatly. Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So, instead of a straight-line food chain, the relationship can be shown as a series of branching lines called a food web.

Green plants in a terrestrial ecosystem capture ___________of the energy of sunlight that falls on their leaves and convert it into food energy.

A
1%

B
5%

C
10%

D
None
Question 10
1 / -0

The length and complexity of food chains vary greatly. Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So, instead of a straight-line food chain, the relationship can be shown as a series of branching lines called a food web.

Biological magnification is greatest in:

A
Plants

B
Lion

C
Humans

D
Micro-organisms
Question 11
1 / -0

The length and complexity of food chains vary greatly. Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So, instead of a straight-line food chain, the relationship can be shown as a series of branching lines called a food web.

Decomposers comprises of:

A
Bacteria

B
Fungi

C
Earthworms

D
All
Question 12
1 / -0

The length and complexity of food chains vary greatly. Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So, instead of a straight-line food chain, the relationship can be shown as a series of branching lines called a food web.

Flow of energy in food web is unidirectional. This implies:

A
1% law

B
5% law

C
10% law

D
None
Question 13
1 / -0

The acid produced during ant sting is :

A
Ethanoic acid

B
Methanoic acid

C
Formic acid

D
None

Solution

Formic acid is produced during ant sting. It is an ant-injected acid, it causes a burning sensation. To neutralize the influence, a mild base such as baking soda or soap needed to be applied.
Question 14
1 / -0

Vanilla is an olfactory indicator. The smell of vanilla vanishes with :

A
Base

B
Acid

C
Strong acid

D
None

Solution

Vanilla: The smell of vanilla vanishes with base, but its smell does not vanish with an acid.
Question 15
1 / -0

In paramecium, which is also a unicellular organism, the cell has a definite shape and food is taken in at a specific spot. Food is moved to this spot by the movement of cilia, which cover the entire surface of the cell.

Depending on their environmental conditions, a paramecia can reproduce:

A
Asexually

B
Sexually

C
Both (A) and (B)

D
None
Question 16
1 / -0

In paramecium, which is also a unicellular organism, the cell has a definite shape and food is taken in at a specific spot. Food is moved to this spot by the movement of cilia, which cover the entire surface of the cell.

The significant advantages of conjugation for paramecium is:

A
Genetic variation

B
Rejuvenation

C
Survivability

D
All
Question 17
1 / -0

In paramecium, which is also a unicellular organism, the cell has a definite shape and food is taken in at a specific spot. Food is moved to this spot by the movement of cilia, which cover the entire surface of the cell.

The mutualistic relationship between paramecium and algae is called:

A
Parasitic

B
Symbiotic

C
Endo-symbiotic

D
None
Question 18
1 / -0

In paramecium, which is also a unicellular organism, the cell has a definite shape and food is taken in at a specific spot. Food is moved to this spot by the movement of cilia, which cover the entire surface of the cell.

Paramecium cell moves and collects food using:

A
Flagella

B
Cilia

C
Both (A) and (B)

D
None
Question 19
1 / -0

In paramecium, which is also a unicellular organism, the cell has a definite shape and food is taken in at a specific spot. Food is moved to this spot by the movement of cilia, which cover the entire surface of the cell.

The “Specific spot” to take in food, is:

A
Oval groove

B
Food vacuoles

C
Lysosomes

D
None
Question 20
1 / -0

In teeth, the bacteria, acid, food debris, and saliva combine to form :

A
Plaque

B
Cavities

C
Caries

D
None.

Solution

The bacteria, acid, food debris, and saliva combine to form plaque, which clings to the teeth. The acids in plaque dissolve the enamel surface of the teeth, creating holes in the teeth called cavities. Cavities are also called as tooth decay or caries.
Question 21
1 / -0

The oxides of metals that are low in the activity series can be reduced to metals by :

A
Treating it with carbon

B
Electrolytic reduction

C
Heating alone

D
None.

Solution

Metals that are low in the activity series are very un- reactive. The oxides of these metals can be reduced to metals by heating alone. For example, mercury is obtained from its ore, cinnabar (HgS), by the process of heating.

\(2HgS+3O_2\overset{\Delta}{\longrightarrow} 2HgO+2SO_2\) (Roasting)

\(2HgO\overset{\Delta}{\longrightarrow}2Hg+O_2\) (Reduction)
Question 22
1 / -0

Alloying is a very good method of improving the properties of a metal. We can get the desired properties by this method. For example, iron is the most widely used metal. But it is never used in its pure state. This is because pure iron is very soft and stretches easily when hot. But, if it is mixed with a small amount of carbon (about 0.05%), it becomes hard and strong.

When iron is mixed with nickel and chromium, we get:

A
Chromium steel

B
Gun metal

C
Stainless steel

D
None
Question 23
1 / -0

Alloying is a very good method of improving the properties of a metal. We can get the desired properties by this method. For example, iron is the most widely used metal. But it is never used in its pure state. This is because pure iron is very soft and stretches easily when hot. But, if it is mixed with a small amount of carbon (about 0.05%), it becomes hard and strong.

Alloying is done:

A
To enhance the properties of a metal

B
To make metal were lustrous

C
To make metal stronger

D
All
Question 24
1 / -0

Alloying is a very good method of improving the properties of a metal. We can get the desired properties by this method. For example, iron is the most widely used metal. But it is never used in its pure state. This is because pure iron is very soft and stretches easily when hot. But, if it is mixed with a small amount of carbon (about 0.05%), it becomes hard and strong.

We know alloying is done to make the metal rust free. When iron is coated with zinc, process is called:

A
Electroplating

B
Tinning

C
Galvanisation

D
All
Question 25
1 / -0

Alloying is a very good method of improving the properties of a metal. We can get the desired properties by this method. For example, iron is the most widely used metal. But it is never used in its pure state. This is because pure iron is very soft and stretches easily when hot. But, if it is mixed with a small amount of carbon (about 0.05%), it becomes hard and strong.

The galvanised article is protected against rusting even if the zinc coating is broken. This is because:

A
Article being more reactive

B
Zinc being more electropositive and hence reactive

C
Zinc is highly electronegative

D
None
Question 26
1 / -0

Alloying is a very good method of improving the properties of a metal. We can get the desired properties by this method. For example, iron is the most widely used metal. But it is never used in its pure state. This is because pure iron is very soft and stretches easily when hot. But, if it is mixed with a small amount of carbon (about 0.05%), it becomes hard and strong.

We don’t want gold to be of 24 carats, as it is very soft. To make it suitable for jewellery, we alloy gold with:

A
Copper

B
Silver

C
Both (A) and (B)

D
None
Question 27
1 / -0

A non-metal which is lustrous is :

A
Sulphur

B
Phosphorus

C
Iodine

D
None.

Solution

Iodine and carbon are non- metals which are lustrous.

Carbon is lustrous only in forms like diamond and graphite.
Question 28
1 / -0

When zinc is added to solution of Iron (II) sulphate, the colour of iron sulphate changes from green to :

A
Colourless

B
Blue

C
Purple

D
None.

Solution

When zinc is added to solution of iron (II) sulphate, the colour of iron sulphate solution changes from green to colourless. It is because zinc is more reactive than iron, therefore, it displaces iron from its solution and a grey precipitate of iron and a colourless solution of zinc sulphate is formed.

\(Zn+FeSO_4 \rightarrow ZnSO_4+Fe\)
Question 29
1 / -0

Electromagnets are made out of a coil of wire (wire curled in series). This is more effective in producing a magnetic field than just a wire running straight. The magnetic field disappears when the current is turned off. MRI scan uses electromagnets.

Magnetic strength of an electromagnet can be easily altered by:

A
Changing current

B
Increasing no. Of turns

C
Both (A) and (B)

D
None
Question 30
1 / -0

Electromagnets are made out of a coil of wire (wire curled in series). This is more effective in producing a magnetic field than just a wire running straight. The magnetic field disappears when the current is turned off. MRI scan uses electromagnets.

Advantage of electromagnet over bar magnet is:

A
Polarity of electromagnet can be reversed

B
Polarity of electromagnet cannot be reversed

C
Being a temporary magnet

D
None
Question 31
1 / -0

Electromagnets are made out of a coil of wire (wire curled in series). This is more effective in producing a magnetic field than just a wire running straight. The magnetic field disappears when the current is turned off. MRI scan uses electromagnets.

One disadvantage of electromagnet over bar magnet is:

A
Use of power

B
Polarity reversal

C
Both (A) and (B)

D
None
Question 32
1 / -0

Electromagnets are made out of a coil of wire (wire curled in series). This is more effective in producing a magnetic field than just a wire running straight. The magnetic field disappears when the current is turned off. MRI scan uses electromagnets.

Mobiles and telephones uses:

A
Bar magnet

B
Electromagnet

C
Earth’s magnetism

D
None
Question 33
1 / -0

Electromagnets are made out of a coil of wire (wire curled in series). This is more effective in producing a magnetic field than just a wire running straight. The magnetic field disappears when the current is turned off. MRI scan uses electromagnets.

Full form of MRI is:

A
Magnetic resonance imaging

B
Magnetic remanence intensity

C
Magnetic resonance and interference

D
None
Question 34
1 / -0

Which metals do not corrode easily ?

A
Alkali metals

B
Alkaline earth metals

C
Noble metals

D
Transition metals.

Solution

Noble metals such as gold and platinum do not corrode easily.
Question 35
1 / -0

Aqua regia is a mixture of concentrated hydrochloric acid and nitric acid in the ratio :

A
2:1

B
3:1

C
1:1

D
1:3

Solution

Aqua regia is a mixture of concentrated hydrochloric acid and nitric acid in the ratio 3:1 and can dissolve noble metals like gold and platinum.

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CBSE Class 10th Science Mix Test - 10

Result

CBSE Class 10th Science Mix Test - 10

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SHARING IS CARING

Question 1

16 cm

20 cm

32 cm

infinite

Solution

Question 2

30 cm behind the mirror

30 cm in front of the mirror

20 cm behind the mirror

None

Solution

Question 3

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true

Question 4

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

Question 5

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false.

A is false, but R is true.

Question 6

\(3\times 10^8 m/s\)

\(2\times 10^8m/s\)

\(1.5\times 10^8m/s\)

\(None\)

Solution

Question 7

40 cm

25 cm

30 cm

32 cm.

Solution

Question 8

Producers

Primary consumers

Secondary consumers

Tertiary consumers

Question 9

1%

5%

10%

None

Question 10

Plants

Lion

Humans

Micro-organisms

Question 11

Bacteria

Fungi

Earthworms

All

Question 12

1% law

5% law

10% law

None

Question 13

Ethanoic acid

Methanoic acid

Formic acid

None

Solution

Question 14

Base