CBSE Class 10 Science Term 2 Sample Paper
Class – X Exam 2021-22
Science (086)
Time Allowed: 120 minutes
(Maximum Marks: 40)
General Instructions:
All questions are compulsory.
- The question paper has three sections and 15 All questions are compulsory.
- 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 (03)
- 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 :
1. Give the IUPAC names of
-
- CH3 – CH2 – Br
- CH3 – CH2 – CH2 – CH2 – C / CH
2. Account for the following :
-
- Elements of group 17 are
- Elements of group 18 are called zero
3. (a) Write full form of DNA
(b) Why are variations essential for the species?
4. (a) List three distinguishing features between sexual and asexual types of reproduction
(b) Explain why variations are observed in the off springs of sexually reproducing organisms ?
5. What are the functions of testis in the human male reproductive system? Why are these located outside the abdominal cavity?
OR
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit.
Give reasons.
6. State what would happen to the direction of rotation of a motor, if
- the current were reversed ?
- both current and magnetic field were reversed
OR
The given magnet is divided into three part A, B and C .
| A | B | C |
Name the parts where the strength of the magnetic field is :
- maximum,
- minimum
How will the density of magnetic field lines differ at these parts ?
7. In the following food chain, 5 J of energy is available to How much energy was available at producer level ?
Plant ” Sheep ” Man.
OR
Aquarium need to be cleaned once in a while whereas ponds or lakes do not require any cleaning : Explain
Section B
8. Three elements X , Y and Z have atomic numbers 7, 8 and 9 respectively.
(a) Arrange them in the decreasing order of their atomic
(b) Which of the three is most electronegative? Why?
(c) Write the formula of compound formed between
(i) X and Y
(ii) X and Z
9. Na, Mg, Al, Si, P, S, Cl and Ar are the elements of third period :
- Which one of them is an inert gas ? Why?
- Which one of them has the valency 4 ? What kind of bond does it form ionic or covalent ?
OR
Give reasons for the following :
- Lithium atom is smaller than sodium atom.
- Chlorine (atomic number 17) is more electronegative than sulphur (atomic number 16).
10. Distinguish between the acquired traits and the inherited traits in tabular form, giving one example for each.
11. (a) List the factors on which the resistance of a conductor in the shape of wire depends.
- Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason.
- Why are alloys commonly used in electrical heating devices? Give reason.
12. What would be the reading of ammeter and voltmeter in the given circuit?
OR
Answer the following questions :
- What is the direction of magnetic field lines outside a bar-magnet ?
- The magnetic field lines in a given region are getting crowded. What does it indicate ?
- State one advantage of AC over DC.
13. You have been selected to talk on “ozone layer and its protection in the school assembly” on “Environment Day”.
- Why should ozone layer be protected to save the environment ?
- List any two ways that you would stress in your talk to bring in awareness amongst your fellow friends that would also help in protection of ozone layer as well as the environment.
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.
Table-A
| Characters | Males | Females | |
| 1. | Total no. of chromosomes | 23 pairs | 23 pairs |
| 2. | No. of autosome | 22 pairs | 22 pairs |
| 3. | No. of sex chromosome | 1 pair | 1 pair |
- What is sex determination?
- What are the sex chromosomes in the males?
- What are the sex chromosomes in the females?
- Is the father responsible for the sex of the child?
15. Read the following case based passage and answer the questions given after passage.
A room has two tube lights, a fan and a TV. Each tube light draws 40 W, the fan draws 80 W and the TV draws 60 W on the average, the tube lights are kept on for five hours, the fan for twelve hours and the TV for eight hours every day. The rate for electrical energy is < 3.10 per kWh.
- Calculate the energy consumed by each tube light in a
- What is the total energy consumed in a day?
- Find the cost of electricity used in this room in a 30-day
OR
What quantities determines the rate at which energy is delivered by current?