Please refer to Class 10 Social Science Sample Paper Term 2 With Solutions Set G below. These Class 10 Science Sample Papers will help you to get more understanding of the type of questions expected in the upcoming exams. All sample guess papers for Social Science Class 10 have been designed as per the latest examination pattern issued by CBSE. Please practice all Term 2 CBSE Sample Papers for Social Science in Standard 10.
Sample Paper Term 2 Class 10 Social Science With Solutions Set G
Section – A
1. Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K
(a) Pick two sets of elements which have similar properties.
(b) The given sequence represents which law of classification of elements?
Answer : (a) Two sets of elements which have similar properties are: (i) F and Cl, (ii) Na and K (b) The given sequence represents Newland’s law of octaves as in 1866, John Newlands, arranged the then known elements in the order of increasing atomic masses.
2. “The chromosome number of the sexually reproducing parents and their offspring is the same.” Justify this statement.
Answer : Human males and females have 46 chromosomes. However, both male and female gametes are haploid (n), i.e., contains 23 chromosomes. During fertilisation, both male (23 chromosomes) and female (23 chromosomes) gametes fuse to give rise to a zygote having diploid (2n) i.e., 46 chromosome.
OR
“Human males are heteromorphic while females are homomorphic”. Explain.
Answer : Human males have XY sex chromosomes, where X chromosome is morphologically distinct from Y chromosome. Y chromosome is smaller than X chromosome. Hence they are dissimilar or heteromorphic. Human females have XX sex chromosomes, thus they are homomorphic.
3. (a) Two magnets are lying side by side as shown below. Draw magnetic field lines between poles P and Q.
(b) What does the degree of closeness of magnetic field lines near the poles signify?
Answer : (a)
(b) The degree of closeness of magnetic field lines near the poles signify that field is stronger, i.e., the pole of another magnet when placed in the magnetic field experiences a greater force in the region where the field lines are crowded.
OR
(a) What kind of energy transformation takes place when a magnet is moved towards a coil and a galvanometer is connected at the two ends of the coil?
(b) What is the name of this phenomenon?
Answer : (a) Mechanical to electrical energy transformation takes place.
(b) Electromagnetic induction.
4. Why sexual reproduction is considered advantageous over asexual reproduction?
Answer : Sexual reproduction has the following advantages over asexual reproduction:
(i) Variation: Sexual reproduction involves fusion of gametes hence, genetic recombination takes place resulting in variation.
(ii) Adaptation: The offspring produced due to sexual reproduction adapt better to the changing environmental conditions.
5. Write the molecular formula of the following compounds and draw their electron-dot structures:
(a) Ethane (b) Ethene
Answer : (a) Ethane: C2H6
6. In biology class, a teacher taught his student about male reproductive part. He taught that tail.
(a) What is the role of the long tail?
(b) How are the sperms delivered from the site of their production?
Answer : (a) The long tail of sperms helps in quick movement or motility of sperms through the female reproductive tract.
(b) Sperms are delivered from the site of their production by vas deferens, also known as sperm duct, to the urethra in order to allow the passage of semen outside the body.
7. During a class test teacher asked student to identify the correct image of the different trophic levels given bellow along with reasons.
Answer : Fig. “A” is correct.
• In an ecosystem, the number of individuals at producer level is maximum. This number reduces at each successive level. Therefore, the shape is a pyramid with broader base and tapering apex.
• On an average 10% of the food changes into body mass and is available for the next level of consumers.
OR
An ecosystem consists of biotic components comprising of living organisms and physical factors.
(a) How do biotic and abiotic components differ from each other?
(b) Write any four examples of abiotic components of an ecosystem.
Answer : (a) Biotic components are the living organisms of an ecosystem which obtain inorganic nutrients and energy from abiotic components whereas abiotic components are non living physicochemical factors of an ecosystem which affect the distribution and structure of organisms, behaviour and inter-relationship.
(b) The abiotic components of ecosystem are: temperature, soil, rainfall and minerals.
Section – B
8. Piyu saw a female being blamed by the family members for producing a girl child. She approached them and explained the genetic basis of sex determination of human beings. She explained them that mother is not responsible for the girl child. The family members agreed to her argument and felt sorry for their act.
Based on the above case, answer the following questions:
(a) What is the basis of sex determination in human beings?
(b) What are the chances of the birth of a boy or a girl during sexual reproduction in human beings?
Answer : (a) Sex in human beings is genetically determined by the sperm of the father. A male cell has two types of sex chromosomes i.e., X-chromosome and Y-chromosome because of which male produces two types of sperms with genotype A + X and A + Y. Female cells have two Xchromosomes so the genotype of eggs produced by her is A + X.
(b) During fertilisation, the chances are 50-50.
• If a sperm carrying Y-chromosome fertilises the egg, then the child born will be a male i.e., AA + XY.
• If a sperm carrying X-chromosome fertilises the egg, then the child born will be a female i.e., AA + XX.
9. An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
(a) Where in the periodic table are elements X and Y placed?
(b) Classify X and Y as metal (s), non-metal (s) or metalloid (s).
(c) What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed.
Answer : (a) X belongs to Group 17 and 3rd period, Y belongs to Group 2 and 4th period.
(b) X — Non-metal and Y — Metal.
(c) Basic oxide; Ionic bonding.
OR
(a) On what basis an element can be classified as a metal or a non-metal?
(b) Name the most electropositive and most electronegative element of the periodic table.
Answer : (a) The metallic character of an element is due to its tendency to release electrons. By losing electrons, metal atoms change to positive ions or cations. Hence, metals are electropositive in nature.
M – e– → M+
Non-metallic character of an element is due to its electron accepting tendency. By accepting electrons, non-metal atoms change to negative ions. Hence, nonmetals are electronegative in nature.
E + e– → E–
(b) Caesium is the most electropositive (metallic) and fluorine is the most electronegative (nonmetallic) element.
10. 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 the difference in the arrangement of atoms within the molecule, without any reference to space, the phenomenon is called structural isomerism.
(a) Draw the structures of two isomers of butane, C4H10.
(b) Why can’t we have isomers of first three members of alkane series?
Answer : (a)
(b) Isomerism is not possible in first three members of alkane series (i.e., methane, ethane, propane) because the parent chain has only 1, 2, 3 carbon atoms so, it is not possible to have different arrangements of carbon (C) atoms.
11. Vaani connected a hot plate to a 220 V line, which has two resistance coils A and B, each of 22W resistances.
Now she wants to calculate the amount of electric current flowing when these coil are :
(a) used individually.
(b) connected in series.
(c) connected in parallel.
Answer : (a) By Ohm’s law, V = IR.
Current flowing in each resistance individually is,
(b) When two resistances are in series connection, Req = R1 + R2 = 22 + 22 = 44 Ω
(c) When two resistances are in parallel connection.
12. (a) (i) Two circular coils P and Q are kept close to each other, of which coil P carries a current. If coil P is moved towards Q, then will some current be induced in coil Q? Give the reason for your answer and name the phenomenon involved.
(ii) What happens if coil P is moved away from Q?
(b) State few methods of inducing current in a coil.
Answer : (a) (i) When coil P is moved towards Q, then current will be induced in coil Q. This is
because on moving P, the magnetic field associated with Q increases and so a current is induced.
The phenomenon is electromagnetic induction.
(ii) If P is moved away from Q, then the magnetic field associated with Q will decrease and a current will be induced but in the opposite direction.
(b) Some of the methods of inducing current in the coil are as below:
(i) Moving a magnet towards or away from the coil.
(ii) Moving a coil towards or away from a magnet.
(iii) Rotating a coil within a magnetic field.
OR
(a) State four factors on which the strength of magnetic field produced by a current carrying solenoid depends.
(b) Draw circuit diagram of a solenoid to prepare an electromagnet.
Answer : (a) Strength of magnetic field produced by a current carrying solenoid depends upon the following factors:
(i) number of turns in the coil (ii) amount of current flowing through it
(iii) radius of coil (iv) material of core of the solenoid.
(b) A strong magnetic field produced inside a solenoid can be used to magnetise a piece of magnetic material, like soft iron, when placed inside the coil. The magnet so formed is called an electromagnet.
13. We observe heaps of garbage lying along the roads while passing through a highway. Open dumping is the most common method of waste disposal in India. The trash heaps are usually left open to the environment and the elements. These seldom have a sparse covering which can often attract pests or vermin. According to Priyanka’s father, it is the responsibility of the government to arrange for the management and disposal of waste.
(a) As an individual you have no role to play. Do you agree? Support your answers with two reasons.
(b) Give any two ways in which non-biodegradable substances would affect the environment.
Answer : (a) I do not agree. As an individual, I also have the responsibility and can contribute in the following ways:
(i) Cut down waste generation.
(ii) Make compost pit for biodegradable Waste.
(iii) Recycle non-biodegradable waste. (Any two)
(b) (i) Excess use of non-biodegradable pesticide and fertilizers run off with rain water to water bodies and cause water pollution.
(ii) They may choke the sewer system of city or town that may overflow over roads.
Section – B
14. Study the I-V graph for four conductors A, B, C and D having resistance RA, RB, RC and RD respectively, and answer the following questions:
(a) If all the conductors are of same length and same material, which is the thickest?
(b) If all the conductors are of same thickness and of same material, which is the longest?
(c) Which one of these is a best conductor?
OR
If the dimensions of all the conductors are identical, but their materials are different which one
would you use as (a) resistance wire, (b) connecting wire?
Answer :
15. A dihybrid cross describes a mating experiment between two organisms that are identically hybrid for two traits. A hybrid organism is one that is heterozygous, which means that it carries two different alleles at a particular genetic position, or locus. Therefore, a dihybrid organism is one that is heterozygous at two different genetic loci. In 1865, Gregor Mendel studied the inheritance pattern of traits in a pea plant. According to this study, he obtained 9 : 3 : 3 : 1 ratio of certain traits in progeny of F2 generation.
Based on the given information, answer the questions given below:
(a) What trait did he study? How do they represent themselves?
(b) What was the trait of F1 progeny?
(c) Which rule does this inheritance pattern suggest? Explain.
OR
How did Mendel’s experiments show that different traits are inherited independently? Explain.
Ans: (a) Traits studies by Mendel were: Height of pea plant: Tall or short Colour of seed: Yellow or green
Formation of seed: Smooth or wrinkled, etc.
Traits like: Tallness, Yellow colour and smooth seed were dominant in nature while shortness, green colour an wrinkled seeds were recessive in nature.
(b) Plants of F1 generation were all yellow and round seeded (YyRr).
(c) Progeny of F1, that is F2 generation, contained yellow and green seeded, yellow wrinkled seeded, dwarf round seeded and green wrinkled seeded plants in the ratio of 9:3:3:1. Appearance of dwarf round seeded and green wrinkled seeded plants shows recombination of traits of the two characters. The phenomenon is called principle of independent assortment.
OR
Mendel conducted a dihybrid cross and observed that though he started with two types of parents, he obtained four type of individuals in F2. The appearance of new recombination in F2 generations along with parental type characters show that traits are inherited independently of each other.
