CBSE(NCERT) GRADE 10 SCIENCE 2022 COMPARTMENT SET3

________ is located in the 2nd group and 3rd period of the Modern Periodic Table. (a) Identify it and write the names of any two members of the same group.

Carbon forms compounds mainly by covalent bonding. Why?

Name the parts A, B and C of the diagram given below. Write a function of the part B.

What is placenta? Why is it extremely essential for the development of embryo?

(a) (i) A magnetic compass shows a deflection when placed near a current carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? What does it indicate? (ii) State Right hand thumb rule.

(a) (i) Why are crop fields considered as artificial ecosystems? (ii) Write a common food chain of four steps operating in a terrestrial ecosystem.

(b) (i) Why should biodegradable and non-biodegradable wastes be discarded separately? (ii) What destructive effect do chlorofluorocarbons bring about in the atmosphere and to the mankind?

In humans, male sex chromosomes are XY and female sex chromosomes are XX. Statistical probability of getting either a male or a female child is 50%. Justify this reason.

If we cross a tall plant (Tt) with a short plant (tt), what ratio of (Tt) and (tt) plants shall we obtain in F$_2$ generation? Show with the help of flow chart only.

State Right hand thumb rule.

List two factors on which the strength of magnetic field at a point due to a current carrying straight conductor depends. State the rule that determines the direction of magnetic field produced in this case.

Differentiate between binary fission and multiple fission giving one example for each.

Why are crop fields considered as artificial ecosystems?

Give reasons for the following: (a) The existence of decomposers is essential in a biosphere. (b) Flow of energy is unidirectional in a food chain. (c) A food chain generally consists of only three or four trophic levels.

Write a common food chain of four steps operating in a terrestrial ecosystem.

Define the term electric power. An electric device of resistance $R$ when connected across an electric source of voltage $V$ draws a current $I$. Derive an expression for the power in terms of resistance $R$ and voltage $V$. What is the power of a device of resistance 400 operating at 200 V?

Why should biodegradable and non-biodegradable wastes be discarded separately?

Take two different coils of copper wire having large number of turns, say 50 and 100 turns respectively. Insert them over a non-conducting roll as shown in the given figure. Connect the Coil-1, having large number of turns, in series with a battery and a plug key. Also connect the other Coil-2 with a galvanometer. (a) Name the two coils used in the given activity. (b) Define the phenomenon involved in this case.

What destructive effect do chlorofluorocarbons bring about in the atmosphere and to the mankind?

A student crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds. He found that only one type of seeds were produced in the $F_1$ generation. When these $F_1$ generation pea plants were self-pollinated with each other, then in addition to the seed type of $F_1$ generation, some new types of seed combinations were also obtained in the $F_2$ generation. (a) Which traits in the above mentioned cross are dominant traits? (b) What are the new possible combinations of seeds likely to be observed in $F_2$ generation?

In the given below compound H H | | H C C O H | | H H identify (I) the heteroatom, and (II) the functional group.

Write the structural formula of butane ($C_4H_{10}$).

Draw the complete structure of the molecule of (I) Cyclohexane, and (II) Benzene. Which of the two is unsaturated?

A compound with molecular formula $C_3H_6O$ has two isomers. (I) Draw the structures of both the isomers. (II) Write their functional group.

Why are the compounds of carbon exceptionally stable?

What was the limitation of Döber

Find the current flowing through the following electric circuit:

List three advantages of connecting electrical appliances in parallel with the mains instead of connecting them in series.

Give reasons for the following: The existence of decomposers is essential in a biosphere.

Give reasons for the following: Flow of energy is unidirectional in a food chain.

Give reasons for the following: A food chain generally consists of only three or four trophic levels.

Explain the reason for the current which is responsible for the deflection in the galvanometer.

A coil AB of copper wire is connected to a galvanometer as shown in the figure. What is observed when N-pole of a strong bar magnet is (I) pushed into the coil, and (II) held stationary inside the coil? State the reason for each observation.

Give reason why the traits which were not visible in the seeds of $F_1$ generation reappeared in the seeds of $F_2$ generation. Write the ratio of different types of seeds obtained in $F_2$ generation in this case.

What is meant by the terms (I) dominant, and (II) recessive traits? Explain.