Sample Paper – 2009
Class – X
Subject – SCIENCE (Theory)
Time: 2 ½ hrs Marks: 60
SECTION – A
Q.1 A ray of light is incident on a convex mirror as shown.
Redraw the diagram after completing the path of the light ray
after reflection from the mirror. [1]
Q.2 Write the chemical name of Washing Soda & Bleaching powder. [1]
Q.3. Consider the reaction: ZnO + C ® Zn + CO
Name the oxidizing & reducing agents. [1]
Q.4 Why does white coloured silver chloride turn grey when kept in sunlight? [1]
Q.5 What is short-circuiting? [1]
Q.6 What is the power of a bulb rated at 2.5 V, 500 mA? [1]
Q.7 An object is kept at a distance of 5 cm in front of a convex mirror of focal length 10 cm. Give the position, magnification and nature of the image formed. [2]
Q.8 What is meant by magnetic field lines? Draw the pattern of magnetic field lines due to a current carrying circular loop of wire. [2]
Q.9 What is the chemical formula of Plaster of Paris? How is it prepared? State the common and the chemical names of the compound formed when Plaster of Paris is mixed with water. [2]
Q.10 Balance the following equations:
(i) Al + HCl ® AlCl3 + H2
(ii) P4 + Cl2 ® PCl5 [2]
Q.11 Write the IUPAC names of the following compounds:
(i) (ii)
(iii)
[3]
Q.12 Give reasons for the following:
- When calcium metal is added to water the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?
Why hydrogen gas is not evolved when a metal reacts with nitric acid? [3]
Q.13 Consider the given circuit diagram,
If each of the resistors has 1 W resistance,
Find: (i) the equivalent resistance, and
(ii) the total current [3]
Q.14 What is an electromagnet? List any of its two uses. What is the purpose of the soft iron core used in making an electromagnet? [3]
Q.15 An element X belongs to 4th period and 17th group of long form of Periodic Table. Answer the following questions:
- How many valence electrons are in element X?
- What is the valency of X?
- Is the element X a metal or a non-metal?
- Name the element.
- Name the family to which the element belongs. [5]
OR
- What were the two major shortcomings of Mendeleev’s Periodic Table? How have been these been removed in the Modern Periodic Table?
- Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the Modern Periodic Table do these two elements belong? What type of bond will be formed between them and why? [5]
(P.T.O.)
Q.16 Give reason for the following:
- Why are danger signals of red colour?
- Why does the sky appear dark and black to an astronaut instead of blue?
- Why do stars twinkle and planets do not?
- The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to enable him to see distant objects clearly [5]
OR
- Draw a neat and labelled diagram of a human eye.
- The far point of a myopic person is 150 cm in front of the eye. Calculate the focal length and the power of the lens required to enable him to see distant objects clearly. [5]
SECTION – B
Q.17 What is the function of valves present in auricles and ventricles? [1]
Q.18 Justify the statement,” Hydrogen is a cleaner fuel than CNG”. [1]
Q.19 How does the creation of variation in species promote survival? [1]
Q.20 Write two advantages and two limitations of solar energy. [2]
Q.21 Name the four gases commonly present in biogas. [2]
Q.22 Define the terms heredity and variation. [2]
Q.23 Write one function each of: (i) pancreatic amylase, and (ii) gastric juice. [2]
Q.24 Write two functions each of testosterone and estrogen. [2]
Q.25 What is an Ecosystem? Write two roles of decomposers in the ecosystem. [3]
Q.26 Give reasons for the following:
- The glottis is guarded by epiglottis.
- The lung alveoli are covered with blood capillaries.
- The walls of trachea are supported by cartilage rings. [3]
Q.27 (a) Draw the structure of neuron and label it.
(b) Name the part of neuron:
- Where information is acquired.
- Through which information travels as an electrical impulse. [5]
OR
- What is tropism? What are the various types of tropism?
- What are phytohormones? Write functions of any two phytohormones. [5]
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