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 (05)
- 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 :
- What is methane? Draw its electron dot Name the type of bonds formed in this compound.’ Why are such compounds:
- poor conductors of electricity? and
- have low melting and boiling points? What happens when this compound burns in oxygen?
2. (a) State Modern Periodic Law.
(b) Where do you think hydrogen should be placed in the Modern Periodic Table ?
3. (a) Name an organism in which binary fission occurs in a definite orientation.
(b) Draw a neat diagram of a germinating seed and label on it the following : Cotyledon, Plumule, Radicle.
4. Define the following processes of asexual reproduction.
- Spore formation
- Regeneration
- Multiple fission
5. List four points of significance of reproductive health in a Name any two areas related to reproductive health which have improved over the past 50 years in our country.
OR
Protozoans reproduce by binary fission as well as by multiple fission. In your opinion, which process is better and why?
6. AB is a current carrying conductor in the plane of the paper as shown in figure.
- What are the directions of magnetic fields produced by it at points P and Q ? Given r1 > r2
- Where will the strength of the magnetic field be larger ?
OR
A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that :
- the degree of deflection of the magnetic compass increases when the compass is moved away from the conductor.
- the degree of deflection of the magnetic compass increases when the current through the conductor is increased.
Which of the above observations of the student appears to be wrong and why ?
7. If a lake is contaminated with pesticides, which one of the following organisms will contain in its body the maximum concentration of pesticides and why ?
Small fish, Pelicans, Zooplanktons, Phytoplanktons, Big fish.
OR
What will happen to the garbage and dead animals and plants in absence of microorganisms ?
Section B
8. An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent
- What is the position of elements X and Y in Periodic Table ?
- What will be the nature of oxide of element Identify the nature of bonding in the compound formed.
9. (a) Complete the following reactions and name the main product formed in each case :
OR
Fluorine (atomic number 9) and chlorine (atomic number 17) are members of the Periodic Table.
- Write their electronic
- Which one is more electro-negative ? Give one
10. How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism?
11. Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 4Ω in series with a combination of two resistors ( 8Ω each) in parallel and a voltmeter across parallel Each of them dissipate maximum energy and can withstand a maximum power of 16W without melting. Find the maximum current that can flow through the three resistors.
12. V –I graph for a conductor is as shown in figure.
- What do you infer from this graph ?
- State the law expressed here
- Name the physical quantity represented by the slope of this graph and its
OR
The flow of current in a circular loop of wire creates a magnetic field at its center. How may existence of this field be detected ? State the rule which helps to predict the direction of this magnetic field.
13. Explain the phenomenon of Biological How does it affect organisms belonging to different trophic levels particularly the tertiary consumers ?
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 follwoing table and answer the following questions.
Table – A
| S. No. | Generation | Phenotypic ratio |
| 1. | F1 generation | 23 pairs |
| 2. | F2 generation | 22 pairs |
- State the law of
- What is the dominant allele?
- Define the term
OR
What is the meaning of genotype?
15. Read the following case based passage and answer the questions given after passage.
A D.C. generator also called a D.C. dynamo converts mechanical energy into electrical energy (D.C.). It works on the principle that when a coil rotates in a uniform magnetic field, a current is induced in the coil. The direction of induced current is determined by Fleming’s right hand rule. The schematic diagram of a D.C. generator is as shown in figure.
- What is the main difference in structure of AC and DC generator ?
- What is the frequency of C.?
- What type of dynamo is used in a bicycle? What is the function of dynamo in bicycle ?
OR
A D.C. motor is rotating in clockwise direction. How can the direction of rotation be reversed?