CBSE Class 10 Science Term 2 Sample Paper (Set-2)

CBSE Class 10 Science Term 2 Sample Paper

Class – X Exam 2021-22

Science (086)

Time Allowed: 120 minutes

(Maximum Marks: 40)

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General Instructions:

All questions are compulsory.

1. The question paper has three sections and 15 All questions are compulsory.
2. Section–A has 7 questions of 2 marks each; Section–B has 6 questions of 3 marks each; and Section–C has 2 case based questions of 4 marks (02)
3. Internal choices have been provided in some A student has to attempt only one of the alternatives in such questions.

Section A

1. Answer the following question :

• Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and allkeynes.
• Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.

2.  (a) State Modern Periodic Law.

(b)     Why is position assigned to hydrogen in Periodic Table considered anomalous ?

3. (a) Trace the path of sperms from where they are produced in human body to the exterior.

(b)     Write the functions of secretions of prostate gland and seminal vesicles in humans.

4. In the diagram of human male reproductive system given below :

• • Label parts A and
  • Name the hormone produced by organ ‘X’. What is the role of this hormone in the human male?

5. A coil of insulated wire is connected to a galvanometer as show in What would be seen if a bar magnet with its south pole towards one face of the coil is :

• moved quickly towards it ?
• moved quickly away from it ?

(i) A compass needle gets deflected when brought near a current carrying conductor why ?

(ii) What happens to the deflection of needle when current in the conductor is increased?

6. Leaves of Bryophyllum fallen on the ground produce new plants, whereas the leaves of Jasmine do Why ?

OR

What are the disadvantages of natural vegetative propagation?

7. Government of India is imposing ban on the use of polythene bags for List for advantages of using cloth or jute bags over polythene bags.

OR

Pesticides like DDT which are sprayed to kill pests on crops are found to be present in the soil, ground water, water bodies etc. Explain how do they reach these places.

Section B

 8. Study the data of the following three categories A, B and C.

Category	Name of the element	Atomic Mass
A	Li	7
	Na	23
	K	39
B	N	14
	P	31
	As	74
C	B	10.8
	Al	27
	Ga	69.7

• From the given three categories A, B and C, pick the one which forms Dobereinefs
• Why did Mendeleev placed elements of category A, B and C in three different groups?
• Is Newland law of octaves applicable to all the three categories? Give reason to justify your answer.

9. An element X has mass number 35 and number of neutrons 18.

• • Write the atomic number of X .
  • Give electronic configuration of X .
  • To which group and period does it belong?

OR

• State the Modern Periodic law.
• Name the element which has twice as many electrons in its second shell as in its first shell. Write its electronic configuration also.

10. How do Mendel’s experiments show that traits may be dominant or recessive?

11. (a) In a given ammeter, a student saw that needle indicates 12th division in ammeter while performing an experiment to verify Ohm’s If ammeter has 10 divisions between 0 to 0.5 A, then what is the ammeter reading corresponding to 12th division ?

(b)  How do you connect an ammeter and a voltmeter in an electric circuit ?

12. Study the given electric circuit and calculate :

(i) The current flowing through the 4 Ω resister and

(ii) Potential difference across the combination of two resistor of 8 Ω each.

OR

Demonstrate that due to motion of a magnet near a solenoid coil an induced current is set up in the coil.

13. (a) “Improvements in our lifestyle have resulted in greater amounts of waste generation.” Give two examples to support the given Suggest one change that we can incorporate in our lifestyle in order to reduce non-biodegradable waste.

(b) The following organisms form a food chain. Insect, Hawk, Grass, Snake, Frog Which of these will have highest concentration of non-biodegradable chemicals? Name the phenomenon.

Section C

This section has 02 case-based questions (14 and 15). Each case is followed by 03 sub-questions (a, b and c). Parts a and b are compulsory. However, an internal choice has been provided in part c.

14. Study the following table and answer the following questions.

	Contraceptive method	Duration of efficiency	Hormonal exposure
1.	Copper IUD	10 years	No
2.	Pills	Use days	Yes
3.	Diaphragm	Reusable	No

• Name the contraceptive device that is commonly used by the
• What is the part of the male reproduction organ that is cut in the process of vasectomy?
• What are STDs?

OR

Syphilis is caused by any microbe. Name it.

15. Read the following case based passage and answer the questions given after passage.

The mobile phone is an excellent communication device. Mobile phones uses electromagnetic radiation in the microwave range. Part of the radio wave emitted by the mobile phone handset will be absorbed by the head.

Head is in the ‘near field’ of radiation, so that most of the heating effect occurs in the head. Temperature in the internal ear, brain increases by 1 degree or more. This adversely affect the functioning of these organs since these have fluid filled cavities. But prolonged heating effect can alter brain functions and hearing ability also. Other harmful effects such as Premature Cataract, Confusion and loss of memory may also be possible. Following figure shows that how mobile phone radiation penetrates the brain.

• Which radiations are used in mobile phones?
• How does prolonged heating effect due to mobile radiations can effect adversely?