Important Questions
Science
Std: 10
Max. Marks : 100
MCQ
5
* 1 = 5
1. Which of the
following is liquid at ordinary temperature?
(a)
Germanium
(b)
Gallium
(c) Gold
(d)
Galena
2. The reducing agent used in the blast furnace to reduce Fe2O3
to Fe is
(a) coke
(b) carbon
(c) lime stone
(d) carbon monoxide
3. Speciation occurs as a result of:
(a)reproductive isolation
(b)natural selection
(c)genetic drift
(d)all of these
4. Which one of the following diseases is transmitted
through sexual contact?
(a) Cancer
(b) AIDS
(c) Tuberculosis
(d) Diabetes
5. In a hydel station, the motion produced in turbines is due to the
(a) burning of coal
(b) burning of diesel
(c) flow of water
(d) production of steam.
Very Short Answer Type Questions - 1 Mark
10 * 1 = 10
1. Elements with eight electrons in their
outermost energy shell are called_____.
2. Can steel be used for making electromagnets?
3. Which is the major constituent of biogas ?
4. Which element has twice as many electrons in its second shell as in its
first shell ?
5. In a solution of lead nitrate, a strip of metal 'M'
was dipped. After some time, lead from the solution was deposited on the metal
strip. Which metal is more reactive, M or lead?
6. Where are sperms deposited during sexual intercourse?
7. Can we change the polarity of a permanent magnet?
8. Interbreeding among individuals of different populations of a species
maintains a free flow of genes in these populations.
9. Write word equation and then balanced chemical equation for the reaction
taking place when dilute sulphuric acid
reacts with aluminium powder
10. Who are the nature and wildlife enthusiasts?
Short Answer Type Questions - 2 Mark
10 * 2 = 20
1. Did Dobereiner's triads also exist in the
columns of Newlands' law of octaves ? Explain your answer.
2. How are the lungs designed in human beings to maximize the area for
exchange of gases?
3. Explain why, respiration is considered an exothermic reaction.
4. What are the special features of commercial electric
motors ?
5. What are the advantages and limitations of using
carbon as a reducing agent in the metallurgy?
6. What type of hydrocarbons give substitution reactions ? Which of the
following hydrocarbons will give a substitution reaction?
CH4;C3H6;C3H8;C4H6;C5H12;C5H10
7. Why is it necessary to clean an aquarium once in a
while?
8. A colourless lead salt, when heated, produces a yellow
residue and brown fumes :
(a) Name the lead salt.
(b) Name the brown fumes.
(c) Write chemical equation of the reaction involved
(d) Name the type of chemical reaction which takes
place.
9. What are fossil fuels ? Give examples of fossil fuels and state their
uses.
10. Name different kinds of waste materials generated in
the household. Classify them into biodegradable and non biodegradable.
Short Answer Type Questions - 3 Mark 10
* 3 = 30
1. What is geothermal energy ? Explain how geothermal energy is used to
generate electricity.
2. Give examples to explain the transformation of
potential energy into kinetic energy and vice versa.
3. How does phototropism occur in a plant stem (or shoot) ? Describe its
mechanism. (This question can also be asked as : Explain the bending of a plant
stem towards sunlight).
4. What do you mean by a solenoid? With the help of a labelled diagram,
show the magnetic field due to a current carrying solenoid.
5. Briefly explain the phenomenon earthing using examples.
6. What are the two types of flames produced by the
burning of fuels? How are these flames produced?
7. What is the general formula of the homologous series of alkanes? Write
the names and formulae of the first four members of the homologous series of
alkanes?. Give one point of difference between them.
8. How will you demonstrate transpiration?
9. How does our body respond when adrenaline is secreted into the blood ?
10. What are the functions of (a) teeth (b) tongue?
Long Answer Type Questions - 5 Mark
7
* 5 = 35
1. What is solar energy? How do form a solar panel cell? What are the uses
of solar cells?
2. What is the relationship between
(a) oxidation and oxidising agent, and
(b) reduction and reducing agent in a redox reaction?
Write an example of a redox reaction showing above
relationships.
3. Describe double circulation in human beings. Why is it necessary?
4. What are alloys? What are the general properties of alloys? List some
important alloys along with their uses.
5. What are solar cells? How are they designed? Does solar energy cause
any environmental pollution? State important uses of solar cells.
6. Draw a labelled sketch to show the domestic electric
wiring from an electric pole to a room. In this diagram show live wire, neutral
wire, earth wire, main fuse, electric meter, main switch, consumer's fuse and
wiring for a bulb and a three-pin socket. Also describe it briefly.
7. In the Modern Periodic Table, calcium (atomic number
20) is surrounded by elements with atomic numbers 12,19 and 38. Which of these
have physical and chemical properties resembling calcium?
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