Guess Paper
– 2010
Class
– X
Subject –Physics
Subject –Physics
1.
Name one main ore of aluminium.
2.
Why carbon
tetrachloride (CC14) does not conduct electricity?
3.
Which group of
elements was missing in Mendeleev's Periodic Table?
4.
State one point of
similarity between the human eye and the camera.
5.
The path of a beam of
light passing through a true solution is not visible. Why?
6.
The elements A, B and
C are present in the same period of Periodic Table. Their atomic radii are
172 pm; 106 pm and 136 pm, respectively. Arrange these elements in increasing order of their atomic
number in the period.
172 pm; 106 pm and 136 pm, respectively. Arrange these elements in increasing order of their atomic
number in the period.
7.
What type of bond is
present in water molecule? Explain the formation of bonds between hydrogen and
Oxygen to form water
molecule.
8.
How many electrons are
associated with (i) one coulomb of charge? (ii) The flow of current of 16 mA for
100 s?
(Given: charge of
electron = 1.6 x 1019 C)
9.
Two 'set-ups'
are shown below: What are we likely to observe if the (i) Magnet in set-up (A) is kept stationary
within
the coil? (if) Key in set-up (B)
is just 'plugged-in’?
(a)
10.
Draw
the pattern of the field lines of the magnetic field produced by a current
carrying
(i) Straight wire (ii)
circular coil (iii) solenoid
11. How many 440 Q resistors should be connected in
parallel to draw a total current of 10 A on a 220 V line?
12. Discuss
the reaction of sodium, magnesium, iron and gold with water.
13. (a)Give an example of the reaction between a non-metal oxide and sodium
hydroxide. Write the balanced
chemical equation also.
(b) The pH of a
solution is 4.8. What is its nature and what will be its action on blue litmus
14. . The image, formed by a concave mirror, is observed to be (I) virtual, erect and larger than the object. (II) Real,
inverted and larger than the object. (III)
Real, inverted and of the same size as the
object. (IV) Real, inverted and smaller than the object.
Where is the position of the object in each of
these cases? Draw ray-diagrams to justify your choices
for cases (I) and (III).
for cases (I) and (III).
Or
A beam of white light is made to
fall on the three set-ups shown here.
What are we likely to observe in
each of these three cases ? How can we understand the similarity in the observations of cases (I) and (III)?
Name the seven colours linked with
the observation in case (II) for sunlight
15.
(a) Write a reaction in which a gas is evolved.
(b)
What are oxidation-reduction reactions?
Write the reaction of copper oxide with hydrogen and
identify the species which is reduced.
identify the species which is reduced.
(c) What is rancidity? OR
How are
chemical reactions classified? Describe the various types of reactions with the
help of an
example in each case.
example in each case.
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