NATIONAL INSTITUTE OF OPEN SCHOOLING (NIOS) CLASS 10 SCIENCE (212) MOST IMPORTANT QUESTIONS FOR EXAM
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Note: These important questions are prepared by private teachers for the revision purpose of the students.
Q. State the postulates of Bohr’s model
of atom. What is the maximum number of electrons that can be accommodated in a
shell ? Write the electronic configuration of chlorine atom (Atomic Number of
chlorine is 17).
Q. Differentiate between primary and secondary air pollutants. Give one example of each.
Q. How does a covalent bond form ? Show the formation of nitrogen molecule (N2 ). How are melting and boiling points, and electrical conductivity of covalent compounds different from those of ionic compounds ?
Q. When do we consider a person to be myopic or hypermetropic ? Draw a ray diagram to show a myopic eye. How can myopia be corrected ? Show with the help of a ray diagram.
Q. List the parts of human respiratory
system and explain the mechanism of breathing
Q. With the help of a diagram and explain
the three major steps in DNA replication.
Q. What are hydrocarbons ? Give the structural differences between saturated and unsaturated hydrocarbons. Give two examples of each
Q. State Mendeleef’s periodic law.
Describe main features of Mendeleef’s periodic table. Explain its significance.
Q. What is meant by buoyant force? State the factors on which buoyant force acting on a body depends at a given place.
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Q. Draw ray diagrams showing the image formation by (a) a concave mirror and (b) a convex mirror, when the object is placed beyond the centre of curvature of mirrors. An object is placed at a distance of 10 cm in front of a convex mirror of focal length 20 cm. Find the position of the image
Q. How is an ionic bond formed? Explain the formation of sodium chloride and magnesium oxide.
Q. Define atomic size. How does the atomic size change in a period and in a group? Where would the element with largest atomic size be placed in a group and (b) period?
Q. What is meant by
electromagnetic induction? Describe an activity to show that a current is set
up in a closed coil when an external magnetic field passing through the coil
changes. State the factors on which the amount of current generated in the coil
in this activity depends. Name two devices which are based on the
principle of electromagnetic induction.
Q. What is meant by ozone hole? What are its causes? Write two hazards of ozone hole. Suggest two ways to prevent damage to ozone layer.
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Q. What
is the difference between multiple cropping and mixed cropping? Explain why
these two methods are considered better from the perspective of food security?
Q. Explain the principle of working of an electric generator. Draw a labelled diagram showing different parts of a D.C. generator.
Q. With the help of
a labelled diagram define the terms amplitude, frequency and wavelength of a
wave. Write the relation between wave velocity, frequency and wavelength.
Q. Why is graphite a
good conductor of electricity and a good lubricant? Explain with the help of a
diagram showing the structure of graphite.
Q. State the Modern Periodic Law. What is
ionization energy? Explain why does ionization energy increase from left to
right in a period but decrease from top to bottom in a group?
Q. Describe the
Rutherford’s model of atom. What were the short comings of this model? How were
these addressed by Bohr in his model of atom?
Note: These important questions are prepared by private teachers for the revision purpose of the students.
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