Please refer to Class 10 Science Sample Paper Term 1 With Solutions Set B provided below. The Sample Papers for Class 10 Science have been prepared based on the latest pattern issued by CBSE. Students should practice these guess papers for class 10 Science to gain more practice and get better marks in examinations. The Term 1 Sample Papers for Science Standard 10 will help you to understand the type of questions which can be asked in upcoming examinations.
Term 1 Sample Paper for Class 10 Science With Solutions Set B
Section – A
1. The formulae of four organic compounds are given below:
A: C2H4 B: CH3COOH
C: C2H5OH D: C2H6
(a) Which one of these compounds A, B, C or D is an unsaturated hydrocarbon?
(b) Identify the organic acid and give its structural formula.
Ans. 1. (a) A and D
(b) B — CH3 COOH
2. The electronic configuration of an element M is 2, 8, 4. State its:
(a) group and period in the Modern Periodic Table.
(b) State it is a metal/non-metal /metalloid.
Ans. Atomic number of silicon is 14.
3. (a) What is the fate of the ovules and the ovary in a flower after fertilization?
(b) How is the process of pollination different from fertilization?
Ans. (a) After fertilization occurs, each ovule develops into a seed. Each seed contains a tiny, undeveloped plant called an embryo. The ovary surrounding the ovules develops into a fruit that contains one or more seeds
(b) The process of pollination is simply the transfer of pollen from one flower to other onto the stigma. The process of fertilization is what happens after the pollen is transferred into the stigma, that is, when the male and female gametes from the zygote.
Pollination takes place only in flowering plants whereas, fertilization happens in almost all animals and plants.
4. Reena studied about asexual reproduction in plants in the school. While playing in the ground of school premises she observed that fallen leaves of ‘Bryophyllum’ on the ground produced new plants. Help her to find the answers for the following questions about it.
(a) What type of asexual reproduction is seen in Bryophyllum?
(b) Give advantage of practicing this process for growing same type of plants.
Ans. Vegetative propagation: Propagation by roots, leaves, stem that helps in the production of plants that have lost the capacity to produce seeds.
5. Teacher was explaining Mendel’s experiment to the students in the class. She discussed about the plants that Mendel used for his experiment. She asked the students to find out the following answers.
(a) Name the plant that Mendel used for his experiment.
(b) What type of progeny was obtained by Mendel in F1 and F2 generations when he crossed the tall and short plants?
Ans. Pisum sativum.
Differentiate between dominant and recessive traits.
Ans. (a) The character which gets expressed in the presence of its contrasting form is termed as dominant trait.
(b) The trait which remains unexpressed in the presence of its contrasting form is called recessive trait.
6. The change in magnetic field lines in a coil is the cause of induced electric current in it.
(a) Name the underlying phenomenon.
(b) On what factors does the direction of induced current in the given phenomena depend?
Ans. (a) Electromagnetic induction.
State the rule to determine the direction of a:
(a) magnetic field produced around a straight conductor-carrying current,
(b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
Ans. (a) Right-hand thumb rule.
7. Plastic cups were used to serve tea in trains in early days-these could be returned to the vendors, cleaned and reused. Later, Kulhads were used instead of plastic cups. Now, paper cups are used for serving tea.
(a) What are the reasons for the shift from plastic to kulhads and then finally to paper cups?
(b) Suggest alternatives to the usage of plastic bags.
Ans. (a) Plastic cups are non-biodegradable.
“Improvements in our lifestyle have resulted in greater amounts of waste generation.”
(a) Give two examples to support the given statement.
(b) How can you help in reducing the problem of waste disposal? Write any two methods.
Ans. 5R’s method: Refuse, reduce, reuse, repurpose, and recycle.
Section – B
8. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements.
(a) What was the basis of Mendeleev’s classification of elements ?
(b) List two achievements of Mendeleev’s Periodic table.
Ans. (a) Mendeleev arranged the elements in increasing order of atomic mass and grouped them as per similar chemical property.
(b) (i) It could classify all the elements discovered at that time.
(ii) It helped in the discovery of new elements.
9. The compounds that are formed due to sharing of electrons between two atoms, have covalent bonds.
(a) How are they different from ionic compounds?
(b) List any two properties of covalent compounds.
Ans. (b)(i) Low boiling points and melting points.
(ii) Various colors.
Methane, ethane, propane, etc., are alkanes. These compounds have similar chemical properties because they possess same functional groups.
(a) Which term is used to refer such type of series of organic compounds ?
(b) Do methanol, ethanol, propanol belong to same series ?
(c) Write the molecular formula of first two members of homologous series having functional group -Br.
Ans. Homologous series.
10. In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white colour (pp).
Explain the inheritance pattern of F1 and F2 generations with the help of a cross. State the visible characters of F1 and F2 progenies.
Ans. Let purple trait be represented by: PP White trait be : pp
Visible characters of F1 progeny all flowers are purple coloured and in F2 progenies 3 are purple coloured and 1 is white coloured flower .
11. (a) Compute the heat generated while transferring 96,000 coulomb of charge in two hours through a potential difference of 40 V.
(b) An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of which of the following rating must be used for it, (i) 4 A (ii) 5 A?
Ans. (a) H = VIt and I = Q/t
(b) I = P/V
12. An electric bulb is rated at 200 V-100 W. Its resistance is 400 W.
(a) Calculate the energy consumed by 3 such bulbs if they glow continuously for 10 hours for complete month of November.
(b) Calculate the total cost if the rate is `6.50 per unit.
Ans. Electrical energy consumed, E = number of units × Power of each unit × time × total days
4 kW heater is connected to a 220 V source of power. Calculate
(a) the electric current passing through the heater.
(b) the resistance of the heater.
(c) the electric energy consumed in 2 hour use of the heater.
Ans. (a) P=V
R=220 x 220/4000
(c) Energy=power *time
E=4000 x 2
13. Carefully study the given food web from a sea shore and answer the questions:
(a) The mussel can be described as primary/secondary consumer in the above food chain. Justify your answer.
(b) Why do all food chains start with plants?
Ans. In any food chain plants are producers, animals which feed on them are primary consumers, those which feed on primary consumers are secondary consumers and so on.
Section – C
14. Sneha performed a cross between plants with purple flowers and plants with white flowers, the offspring of F1 generation all had white flowers. When the F1 generation was self-crossed, it was observed in the F2 generation that out of 100, 75 flowers were white.
(a) Which type of cross it is? Monohybrid/dihybrid? Define the term.
(b) In a monohybrid cross between two heterozygous individuals, what is the percentage of pure homozygous individuals obtained in F1 generation?
(c) List any two contrasting characters other than roundness of pea plants that Mendel used in his experiments with pea plants.
Ans. Monohybrid cross is between two plants differing in only one pair of contrasting characters.
State the Mendel’s first law of inheritance.
Ans. Law of Dominance This is also called Mendel’s first law of inheritance. According to the law of dominance, hybrid offsprings will only inherit the dominant trait in the phenotype.
15. While performing an experiment, a coil of insulated copper wire is connected to a galvanometer by a student. What happens if a bar magnet is:
(a) Pushed into the coil ?
(b) Withdrawn from inside the coil ?
(c) Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
Ans. An induced current is set up in a coil when a bar magnet is pushed into it or withdrawn from the coil
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