CBSE Class 10 Science Important Questions For Term 2 with Answer

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Class 10 Science Term 2 Important Questions

If you are searching for Class 10 Science Term 2 Important Questions then you are at the right place. We have given all the Class 10 Term 2 Science Important Questions as per the CBSE Term 2 syllabus on this page. Students appearing in CBSE Class 10 Term 2 exam must solve the Class 10 Term 2 Science Important Questions given on this page to boost their preparation. CBSE will conduct CBSE Term 2 Exam 2022 for classes 10 and 12 from 26th April 2022 onwards. To perform better than the competition the candidates have to make extra effort to solve the Class 10 Term 2 Science Important Questions given here. The students can bookmark this page to get all the latest updates from CBSE.

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Class 10 Term 2 Science Important Questions: Term 2 Exam Pattern

The students must know the Class 10 term 2 exam pattern, as exam pattern is a must to start preparation for any exam. The Class 10 science exam pattern is as per the sample papers released by the Central Board of Secondary Education. The question paper of Class 10 Term 2 science will be divided into three sections. Check the details of these sections given below:

Section A: In this section, very short type questions will be asked. Each question carries 2 marks.
Section–B: In this section, short type questions will be asked. Each question carries 3 marks.
Section–C: In this section, case-based questions will be asked. Each question carries 4 marks.

Class 10 Science Important Questions for 2 Marks in Term 2

Chapter – 4 Carbon and its Compounds

The element carbon forms a very large number of compounds. Give reason for this fact.
Covalent compounds generally don’t conduct electricity.Why?
State two characteristic features of carbon which when put together give rise to large number of carbon compounds.
What is catenation?
What do you mean by tetravalency of carbon?
Define structural isomerism. Draw the structures of two isomers of butane.

Chapter – 5 Periodic Classification of Elements

How does the tendency to lose electrons change in a group and why?
Why He, Ne and Ar are called inert gases?
Write two limitations of Mendeleev’s Periodic Table.
Why is the position assigned to hydrogen in the periodic table considered anomalous?
How does the metallic character of an element vary as we go down a group? Give reason for this variation.
Why metallic oxides are basic in nature whereas non-metallic oxides are acidic in nature?
How does the atomic size vary as we go down a group? Write the reason behind it.
Four elements P, Q, R and S have atomic number 12, 13, 14 and 15 respectively. Answer the following:

(a) Classify these elements as metals and non-metals.

(b) Which of these elements will form the most basic oxide?

(a) How do we calculate the valency of an element from its electronic configuration?

(b) How does the valency vary in a period?

How many groups and periods are present in the Modern Periodic Table?

Chapter – 8 How Do Organisms Reproduce?

Write two important functions of testosterone.
What is placenta ? Also write its functions.
Why do we see different types of organisms around us?
What is the importance of variation?
Why is vegetative propagation practiced for growing some types of plants?
Write names of male and female sex hormones.
Mention the parts of a flower.
What is the effect of DNA copying which is not perfectly accurate on the reproduction process?

Chapter – 9 Heredity and Evolution

Explain sex determination.
What are genes? Where are they located?
What is meant by dominant genes and recessive genes? Give one example of each.
What are sex chromosomes?
Distinguish between autosomes and sex chromosomes.
Name the four blood groups in human.
Why did Mendel choose pea plants for conducting his experiments on inheritance?
What does law of segregation states?
Differentiate between somatic variation and genetic variation?
Write down the phenotypic ratio and genotypic ratio in monohybrid cross.

Chapter – 12 Electricity

What is electrical resistivity of a material? Write its unit.
What is the commercial unit of electric energy? Convert it into joules.
State Ohm’s law. Write the necessary conditions for its validity.
(a) Define electric power. Express it in terms of potential difference V and resistance R.
An electrical fuse is rated at 2 A. What is meant by this statement?
State difference between the wire used in the element of an electric heater and in a fuse wire.

Chapter – 13 Magnetic effects of current

What is meant by solenoid?
What is an electromagnet? What is the direction of magnetic field lines?
What is the shape of magnetic field lines due to a straight current carrying conductor?
Why do magnetic field lines not intersect each other?
How is the strength of magnetic field near a straight current carrying conductor related to the strength of current in the conductor?
Write one application of each of the following:

(a) Fleming’s left hand rule

(b) Fleming’s right hand rule

List two properties of magnetic field lines.
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

Chapter – 15 Our Environment

Explain how does making of Kulhads affect our environment?
State two differences between a consumer and producer.
Draw the line diagram showing flow of energy in an ecosystem.
Define a food web. State its significance for ecosystem.
What are phytoplanktons.
What will happen if all the phytoplanktons are eliminated from pond?
What is an ecosystem? List its two main components.
Name two natural ecosystems.
We do not clean ponds or lakes, but an aquarium needs to be cleaned regularly. Explain.
In the following food chain 20J of energy was available to the hawks. How much would have been present in the plants?

Plants → Rats → Snakes → hawks.

Class 10 Science Important Questions for 3 Marks in Term 2

Chapter 4: Carbon and its Compounds

What is a homologous series? List any of its two features.
Give reasons for the following:

(a) Element carbon forms compounds mainly by covalent bonding.

(b) Diamond has a high melting point.

Explain why carbon atom is unable to form either cation or anion?
Two carbon atoms cannot be linked to each other by more than three covalent bond. Why?
Describe the two properties of carbon which lead to the formation of huge number of compounds.

Chapter 5: Periodic Classification of Elements

Elements A,B,C,D and E having atomic number: 4, 9, 14, 19, 20.

(a) Name the elements having same valence electrons.

(b) Name the elements of same period. Give reason to your answer.

(a) Newland, Mendeleev and Dobereiner gave their contribution in building Modern Periodic table. List one merit and one demerit of their contribution.

(b) Write the Modern Periodic law.

In reference to Modern periodic table explain what is meant by periodic function of properties of elements? What is the effect on the power of accepting electrons on moving from left to right in Periodic table.
X and Y are two elements having atomic number 20 and 17. Write the formula of compound formed by X and Y and also draw electron dot structure. Write the nature and bond in XY.
Electronic configuration of an element is 2, 8, 47.

(a) Write the group number of this element in modern periodic table.

(b) Write its name and one physical property of this element.

An element belongs to third period and group 13. Find its valence electrons and valency. Another element Y has 18 neutrons in its nucleus and Mass Number 35. Write the group and period number of element Y.
Write the name, symbol and electronic configuration of an element having atomic number 11. Write the group and period number of this element.

Chapter 8: How Do Organisms Reproduce?

What is placenta? Write its functions.
What is the importance of variation?
Why is vegetative propagation practiced for growing some types of plants?
Differentiate between bisexual and unisexual flowers.
What is tissue culture?
Explain the process of fertilisation in flowering plants.
Name the different constituents of semen.
Draw a well-labelled diagram of male reproductive system.
What is pre-natal sex determination? Why is it banned?
Draw a labelled diagram of the longitudinal section of a flower.

Chapter 9: Heredity and Evolution

Differentiate between homologous and analgous organs, with examples.
Variation is beneficial to the species but not necessarily for the individual. Give three reasons to justify it.

The human hand, cat paw and horse foot, when studied in detail show the same structure of bones and point towards a common origin.

(a) What do you conclude from this?

(b) What is the term given to such structure?

What is genetic drift. Explain with examples.
Write a short note on (a) gene flow (b) Natural selection
Distinguish between autosomes and sex chromosomes.
Distinguish between inherited traits and acquired traits giving one example of each. Give reason why the traits acquired by an individual during the life time are not inherited.
A cross is carried between pure bred tall plant and pure bred dwarf pea plant.

(a) What is the phenotype of F1 progeny and why

(b) What is the phenotype of F2 progeny when F1 is selfed.

Chapter 12: Electricity

Find a relationship between P, I and V.
State Ohm’s law. Derive relation between I, V and R. Draw the graph between V and I.
What is Joule’s heating effect of current P? Derive its expression.
What would be new resistance if length of conductor is doubled and thickness is halved?
Find the effective resistance between A and B.
Which is the better way to connect lights and other appliances in domestic wiring and why ?
Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is (i) 13.5 Ω, ii) 6 Ω?
(a) Write Joule’s law of heating.

(b) Two lamps, one rated 100 W; 220 V, and the other 60 W; 220 V, are connected in parallel to electric mains supply. Find the current drawn by two bulbs from the line, if the supply voltage is 220 V.

(a) List the factors on which the resistance of a conductor in the shape of a wire depends.

(b) Why are metals good conductors of electricity whereas glass is a bad conductor of electricity?

Chapter 13: Magnetic Effects of Current

A charged particle enters at right angle into a uniform magnetic field. What is the nature of charge particle if it experiences a force in a direction pointing vertically out of page.

Write the three ways to produce magnetic field.

What is solenoid ? Where the magnetic field is uniform in solenoid?
Draw the pattern of magnetic field lines due to current carrying straight conductor.
(a) Draw a diagram to show the pattern of magnetic field lines through and around a current carrying solenoid.

(b) List two factors on which the strength of the magnetic field produced by the solenoid depends.

A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is

(a) pushed into the coil,

(b) withdrawn from inside the coil,

(a) Mention the factors on which the direction of force experienced by a current-carrying conductor placed in a magnetic field depend.

(b) Under what condition is the force experienced by a current-carrying conductor placed in a magnetic field maximum?

Chapter – 15 Our Environment

Why only 10% energy is transferred to the next trophic level?
Why is ozone layer important for the existence of life on earth?
What is the role of decomposers in ecosystem?
Draw an energy pyramid showing different trophic levels.
How ozone molecule is formed in the atmosphere?
Why natural ecosystem is more stable than artificial ecosystem?
Why some materials are not decomposed by the action of micro-organisms? Give any two ways in which non-biodegradable wastes would affect the environment.
What is a food web? Explain with example.
How the components of an ecosystem are dependent on each other?

Class 10 Science Important Questions for 4 Marks in Term 2

Chapter – 4 Carbon and its compounds

Read the following carefully.

In covalent compounds atoms share valence electrons to satisfy the octet. Each atom shares one pair or two pairs or three pairs of electrons depending on their combining capacity. In electron dot structures only number of valence electrons are shown around the symbols of constituent atoms. Carbon using its valency of four can make either single, double or triple bonds with other carbon atoms or any other atoms. Carbons self-linking property is called catenation. In hydrocarbons carbon makes aliphatic or cyclic molecules they are either saturated or unsaturated. Based on these facts Read the following paragraph and answer the questions given below. An element X combines with Y to form a colourless odourless gas, Z which turns lime water milky is the major constituent of all organic molecules. Five X atoms combines with hydrogens to form a cyclic saturated hydrocarbon J and aliphatic unsaturated hydrocarbon Q.Q is used in gas welding.

(a) Identify compound Z and draw its electron dot structure.

(b) Write the chemical formula and IUPAC name of compound Q

(d) How many single covalent bonds are present in compound J?

Answer:

a) Z is CO2 its electron dot structure is
b) C2H2,ethyne
c) Acetylene
d) 15

Q. Read the following and answer questions from (i) to (iv)

The compounds which have the same molecular formula but differ from each other in physical or chemical properties are called isomers and the phenomenon is called isomerism. When the isomerism is due to difference in the arrangement of atoms within the molecule, without any reference to space, the phenomenon is called structural isomerism. In other words. Structural isomers are compounds that have the same molecular formula but different structural formulas, i.e., they are different in the order in which different atoms are linked. In these compounds, carbon atoms can be linked together in the form of straight chains,branched chains or even rings.

(i) Which of the following sets of compounds have same molecular formula?

(a) Butane and iso-butane

(b) Cyclohexane and hexene

(d) All of these

(ii) In order to form branching, an organic compound must have a minimum of

(a) four carbon atoms

(b) three carbon atoms

(d) any number of carbon atoms.

(iii) Which of the following is an isomeric pair?

(a) Ethane and propane

(b) Ethane and ethene

(d) Butane and 2-methylpropane

(iv) Among the following the one having longest chain is

(a) neo-pentane

(b) iso-pentane

(d) 2,2-dimethylbutane.

Answer:

(i) (d) All of these

(ii) (a) four carbon atoms

(iii) (d) Butane and 2-methylpropane

(iv) (c) 2-methylpentane

Chapter – 5 Periodic classification of elements

Read the following carefully and answer the questions.

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following questions:

(1) To which group or period of the Periodic Table do the listed elements belong?

(2) What would be the nature of compound formed by a combination of elements B and F?

(3) Which two of these elements could definitely be metals?

(4) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.

Answer:

A and B belong to group 1 and 2 because they form basic oxides. C belongs to group 13 as it has 3 valence electrons.

D belongs to group 14 as it forms almost neutral oxide.

E and F belong to group 15 and 16 as they form acidic oxides, G belongs to group 17 as it has 7 valence electrons and

H belongs to group 18.

They belong to 3rd period of the Periodic Table because AG is NaCl, added in a small amount to almost all vegetable dishes during cooking and Na and Cl belong to 3rd period.

Ionic compounds will be formed because ‘B’ is metal and ‘F’ is non-metal. ‘B’ can lose two electrons and ‘F’ can gain two electrons.

A and B are definitely metals as they form basic oxides.
CG3 is the formula of the compound formed by combination of C and G.

Q. Read the following and answer the questions.

Today, 118 elements are known, the first 94 of which occur in nature. Of the 94 natural elements, eighty are stable.The periodic table is a graphic description of the periodic law, which states that the properties and atomic structures of the chemical elements are a periodic function of their atomic number. Elements are placed in the periodic table by their electron configurations, which exhibit periodic recurrences that explain the trends of properties across the periodic table. As we go across a period from left to right, we add a proton to the nucleus and an electron to the valence shell with each successive element. As we go down the elements in a group, the number of electrons in the valence shell remains constant, but the principal quantum number increases by one each time. An understanding of the electronic structure of the elements allows us to examine some of the properties that govern their chemical behavior. These properties vary periodically as the electronic structure of the elements changes.They are

(1) size (radius) of atoms and ions,

(2) ionization energies, and

(3) electron affinities.

Which of the following set of elements is written in order of their increasing metallic character?

(a) Na, Li, K

(b) C, O, N

(d) Be, Mg, Ca

What happens to tendency to gain electron in a period?

(a) Increases,

(b) Decreases,

(d) First increases then decreases.

Which of the following elements would lose an electron easily?

(a) Mg

(b) Na

(d) Ca

4. Atomic size decreases from left to right in a period because

(a) Effective nuclear charge increases

(b) Number of shells remains the same

(d) All of these

Answer:

1 (d)

2 (d)

3 (c)

4 (d)

Chapter – 8 How do organisms reproduce?

Read the paragraph and answer the questions.

The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of population.

1) What are common signs of sexual maturation in boys

a) Broadening of shoulders
b) Development of mammary glands
c) Broadening of waist
d) High pitch of voice

2) Common sign of sexual maturation in girls is

a) Low pitch voice
b) Appearance of moustaches and beard
c) Development of mammary glands
d) Broadening of shoulders

3) Which contraceptive method changes the hormonal balance of the body

a) Condoms
b) Diaphragms
c) Oral pills
d) Both a) and b)

4) What should be maintained for healthy society

a) Rate of birth and death rate
b) Male and female sex ratio
c) Child sex ratio
d) None of these

Answer:

1) a) Broadening of shoulder

2) c) Development of mammary glands

3) c) Oral pills

4) b) Male and female sex ratio

Q. Read the following and answer the questions:

Preeti is very fond of gardening. She has different flowering plants in her garden. One day few naughty children entered her garden and plucked many leaves of Bryophyllum plant and threw them here and there in the garden. After few days, Preeti observed that new Bryophyllum plants were coming out from the leaves which fell on the ground.

What does the incidence sited in the paragraph indicate?

(a) Bryophyllum leaves have special buds that germinate to give rise to new plant.

(b) Bryophyllum an propagate vegetatively through leaves.

(d) Both (a) and (b).

Which of the following plants can propagate vegetatively through leaves like Bryophyllum?

(a) Guava

(b) Begonia

(d) Mint

Do you think any other vegetative part of Bryophyllum can help in propagation? If yes, then which part?

(a) Roots

(b) Stems

(d) Fruits

Which of the following plant is artificially propagated (vegetatively) by stem cuttings in horticultural practices?

(a) Potato

(b) Snake plant

(d) Water hyacinth

Answer:

Chapter – 9 Heredity and Evolution

Read the following and answer questions from (i) to (iv)

Pea plants can have smooth seeds or wrinkled seeds. One of the phenotypes is completely dominant over the other. A farmer decides to pollinate one flower of a plant with smooth seeds using pollen from plant with wrinkled seeds. The resulting pea pod has all smooth seeds.

1) Which of the following conclusions can be drawn?

(i) The allele for smooth seeds is dominated over that of wrinkled seeds.

(ii) The plant with smooth seeds is heterozygous.

(iii) The plant with wrinkled seeds is homozygous.

(a) 1 only

(b) 1 and 2 only

(d) 1, 2 and 3

2) Which of the following crosses will give smooth and wrinkled seeds in same proportion?

(a) RR X rr

(b) Rr X rr

(d) rr X rr

3) On crossing of two heterozygous smooth seeded plants (Rr), a total of 1000 plants were obtained in F1 generation. What will be the respective number of smooth and wrinkled seeds obtained in F1 generation

(a) 750, 250

(b) 500, 500

(d) 950, 50

4)The characters which appear in the first filial generation are called

(a) recessive characters

(b) dominant characters

(d) non-mendelian characters.

Answer:

(c) 1 and 3 only
(b) Rr x rr
(a) 750, 250
(b) dominant characters

Q. Read the passage and answer the given five questions

Pea plant is also tiny, easy to grow, and produces a big number of offspring. Pea plants can have tall plants or dwarf plants. One of the phenotypes is completely dominant over the other. A farmer decides to pollinate one flower of a tall plant with using pollen from plant with dwarf plant. The resulting pea pod has all tall plants.

Which of the following conclusions can be drawn?

(i) The allele for tallness is dominated over that of dwarfness.

(ii) The plant with tallness is heterozygous.

(iii) The plant with dwarfness is homozygous.

(i) only
(i) and (ii) only
(i) and (iii) only
(i), (ii) and (iii).
Which of the following crosses will give tall and dwarf plants in same proportion

(a) TT x tt

(b) Tt x tt

(d) tt x tt

Which of the following cross can be used to determine the genotype of a plant with dominant phenotype?

(a) TTXTT

(b) Tt x Tt

(c)Tt x TT

(d)Tt x tt

State the ratio of tall plant to dwarf plants in F2 genertion. A. 2:2,

B.1:3 C.3:1, D.4:0

Answer:

D. (i), (ii) and (iii).
B. Tt x tt
D. Ttxtt
C. 3:1

Chapter – 12 Electricity

Read the paragraph and answer the questions.

Electrical resistivities of some substances, at 20°C are given below in the table. Study the table and answer the given questions.

Which is a better conductor of electric current ?

(A) Silver

(B) Copper

(D) Mercury

Which element will be used for electrical transmission lines ?

(A) Iron

(B) Copper

(D) mercury U

Nichrome is used in the heating elements of electric heating device because:

(A) It has high resistivity

(B) It does not oxidise readily at high temperature

(D) None of the above U

Series arrangement is not used for domestic circuits because:

(A) Current drawn is less

(B) Current drawn is more

(D) Both of the above U

Answer.

Q. Read the paragraph and answer the questions.

In the given circuit, three identical bulbs B1, B2 and B3 are connected in parallel with a battery of 4.5 V. Study the diagram and answer the questions given below :

What will happen to the other two bulbs if the bulb B3 gets fused ?

(A) They will also stop glowing.

(B) Other bulbs will glow with same brightness.

(D) They glow with more brightness.

2.If the wattage of each bulb is 1.5 W, how much readings will the ammeter A show when all the three bulbs glow simultaneously?

(A) 1.0 A

(B) 2 A

(D) None of the above

Find the total resistance of the circuit.

(A) 1.0 Ω

(B) 4.5 Ω

(D) 2.0 Ω

How many resistors of 88 Ω are connected in parallel to carry 10 A current on a220 V line ?

(A) 2 resistors

(B) 1 resistors

(D) 4 resistors

Answer:

Chapter – 13 Magnetic effects of current

Read the paragraph and answer the questions.

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft.

1) Electric motor is used in

(a) electric fans

(b) refrigerators

(d) all of the above

2) In Electric motor magnetic field is produced by

(a) Permanent magnet

(b) Electro magnet

(d) none of the above.

3) Direction of magnetic force on a current carrying conductor placed in magnetic field is given by

(a) Fleming’s left hand rule

(b) Fleming’s right hand rule

(c ) Right hand palm rule

(d) none of the above

4) Moving part of an electric motor is called (a)brushes

(b) shaft

(d) slip ring

Answer:

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CBSE Class 10 Term 2 Science Important Questions: FAQs

Q. Is NCERT enough for Class 10 Term 2 Science?

Yes, NCERT is more than enough for Class 10 Term 2 Science. The students can practice the CBSE Class 10 Term 2 Science Important Questions given on this page.

Q. Where can I find CBSE Class 10 Term 2 Science Important Questions?

You can find the CBSE Class 10 Term 2 Science Important Questions here. We have given the CBSE Class 10 Term 2 Science Important Questions based on the latest CBSE Term 2 Exam pattern on this page.

Q. When will CBSE conduct CBSE Class 10 Term 2 Exam 2022?

CBSE Class 10 Term 2 Exam 2022 will begin on 26th April 2022 onwards.