CBSE Class 10 Science Term 2 Sample Paper
Class – X Exam 2021-22
Time Allowed: 120 minutes
(Maximum Marks: 40)
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 (01)
- Internal choices have been provided in some A student has to attempt only one of the alternatives in such questions.
1. What happens (write the chemical equation in each case)
- ethanol is burnt in
- a piece of sodium is dropped into ethanol?
2. The electronic configuration of an element is 2, 8, State its:
- group and period in the Modern Periodic
- name and write its one physical
3. What will happen when :
- A mature Spirogyra filament attains considerable length?
- Planaria gets cut into two pieces?
4. (a) Identify the asexual method of reproduction in each of the following organisms :
(i) Rose, (ii) Yeast
(b) What is fragmentation? Name a multicellular organism which reproduces by this method.
5. What is grafting? What do the terms ‘stock’ and ‘scion’ mean in grafting?
Variations are important for the survival of species overtime. Justify this statement with reasons.
6. Study the diagram given below and answer the questions that follow :
- Why do the iron filings arrange in such a pattern?
- What does this pattern demonstrate ?
Diagram below shows a circuit containing a coil wound over a long and thin hollow cardboard tube. Copy the diagram.
- Show the polarity acquired by each face of the solenoid.
- Draw the magnetic field lines of force inside the coil and also show their direction.
7. Draw a diagram to show energy flow in the food chains.
“Energy flow in a food chain is unidirectional.” Justify this statement.
8. The following questions refer to the elements of the Periodic Table with atomic numbers 3 to 18.
- Which of them are noble gases ?
- Which of them are halogens ?
- Which of them are alkali metals ?
9. Two elements X and Y have atomic numbers 12 and 16 respectively.
- To which period of the modern periodic table do these two elements belong ?
- What type of bond will be formed between them and why ?
- Give the chemical formula of the compound formed ?
Account for the following :
- Noble gases are placed in a separate group.
- All the elements of the same group have similar chemical properties.
10. Name the plant Mendel used for his What type of progeny was obtained by Mendel in F1 and F2 generations when he crossed the tall and short plants? Write the ratio he obtained in F2 generation plants.
11. (a) Write the mathematical expression for Joule’s law of heating.
(b) Compute the heat generated while transferring 96000 coulomb of charge in two hours through a potential difference of 40 V.
12. In the given circuit, find :
- Total resistance of the network of resistors
- Current through ammeter A
You are given two identical looking iron bars. Just using these two bars how will you identify whether any or both of these bars is/are a magnet ?
13. (i) Create a terrestrial food chain depicting four trophic levels.
(ii) Why do we not find food chains of more than four trophic levels in nature?
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. Read the following case based passage and answer the questions given after The rules for inheritance of such traits in human beings are related to the fact that both the father and the mother contribute practically equal amounts of genetic material to the child. This means that each trait can be influenced by both parental and maternal DNA.
- What is inheritance?
- Who was the person who gave the three laws of inheritance?
- What is the meaning of paternal and maternal DNA?
What is the phenotypic ratio of the dihybrid cross?
15. Read the following case based passage and answer the questions given after passage.
When a current is passed through the circular loop of wire, a magnetic field lines near the coil are nearly circular and concentric. At the centre of the circular loop, the magnetic field lines are straight.
The strength of the magnetic field produced by a current-carrying circular coil (or circular wire) depends on :
- current flowing through the
- radius of the circular
- number of turns of wire in the circular
The direction of the field lines can be found by applying Right-Hand Thumb Rule.
- State Right-hand Thumb
- A long horizontal power line is carrying a current of 100 A in the east-west What is the direction of magnetic field at a point 1.0 m below it?
- What type of curve we get, between magnetic field and distance along the axis of a current carrying circular coil?
If a current carrying straight conductor is placed in east-west direction, then find the direction of the force experienced by the conductor due to earth’s magnetic field.