CBSE Class X Science Sample Paper 3. Based on CBSE and NCERT guidelines. The students should practice these Sample Papers to gain perfection which will help him to get more marks in CBSE examination. Based on CBSE and CCE guidelines. Based on the same pattern as released by CBSE every year. CBSE releases sample papers every year. These papers are released prior to the CBSE board examinations so that students can do practice.
1. Name the element which has twice as many electrons in its second shell as in its first shell. Write its electronic configuration also.
2. Give common name of the plant on which Mendel performed his experiments.
3. In a food chain comprising frogs, insects, birds and grass, which one of the organisms is likely to have maximum concentration of harmful non biodegradable chemicals in its body?
4. Choose from the following elements whose atomic numbers are given in parentheses
H(1), He(2), C(6), F(9), Na(11), Cl(17), Mg(12)
a) Smallest element of 3rd period.
b) A noble gas.
c) A metal of 3rd period having valency 1.
d) Most non metallic element of 2nd period.
5.What is meant by least distance of distinct vision? How does this vary between the very young and old people?
6. a) Distinguish between biodegradable and non biodegradable pollutants.
b) Choose the bio degradable pollutants from the following.
Sewage, DDT, Radioactive waste, Agriculture waste
7. Construction of dams ensures electricity generation for a large number of villages. State two reasons for opposition to the construction of dams in spite of this advantage.
8. a) State two disadvantages of converting forests into mono culture.
b) Give any two advantages of water stored underground.
c) State any two measures to conserve wildlife.
9. A student has difficulty in reading the blackboard while sitting in last row. What could be defect of vision? Draw ray diagrams to illustrate this defect and its correction.
Refer to attached file for CBSE Class X Science Sample Paper 3.
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