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In which physical state, water exists
at?
(a) 100°C (b)
0°C
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What will happen to a plant cell
if it is kept in a hypotonic solution?
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A body is moving on a rough
level road with a speed of 15 ms-1 along a given direction. Does any
force is needed? Why?
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Which chemical is mostly used to
stain the animal cell in the laboratory?
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State the function of
chromosomes in a cell.
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A student burns a strip of magnesium
metal in the flame. What will he observe?
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When sugar is dissolved in
water, the resulting solution will appear as in
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Reeta mixed starch with water,
boiled the mixture well and stirred it. What did she observe?
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In an experiment to separate the
compounds of a mixture of sand, common salt and ammonium chloride, which component
will be removed by filtration?
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What is the nature of motion in
the following case?
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Does the speedometer of a car measure
its average speed?
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Rashi added 2 mL of barium chloride
solution to 2 mL sodium sulphate solution in a test tube. What did she observe?
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Take a test tube of good quality
glass material and put a amount of water in it. Place a stop cork at the mouth
of it.
Now suspend the test tube horizontally
by two strings or wires as shown in the figure.
Heat the test tube with a burner
until water vaporizes and the cork blows out. Write any two of your
observations.
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Identify the solute and solvent in
: tincture of iodine.
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Draw diagram of stomata.
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How do you separate a mixture of
sulphur, iron filings and salt? Give reason.
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Write difference between
aerenchyma and chlorenchyma.
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(a) Students were instructed to
add a few drops of iodine solution to each of the following samples.
The content turned blue-black in
which sample?
(b) Name the adulterant of arhar
(tuvar) dal.
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To make a saturated solutions,
36g of sodium chloride is dissolved in 100g of water at 293 K.
Find its concentration at this
temperature.
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Name the most popular varieties
of Aseel. What is the average weight of hen and cock of this variety?
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Define a solid. Give its main
characteristics.
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What types of mixtures are
separated by the technique of crystallization?
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Write the main function of each
of the following cell components.
(a) Plasma membrane (b)
Mitochondria
(c) Chromosomes (d)
Ribosomes
(e) Lysosomes (f)
Golgi apparatus
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What are the functions of
parenchyma, collenchyma and sclerenchyma?
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(a) What is cork? Mention its
uses.
(b) How many types of elements
are present in xylem?
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Satvik went on his bike from
Delhi to Faridabad at 40 km/h and in the evening returned back at a speed of 60
km/h. What is his average speed for the entire journey? What is his average velocity?
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An object is thrown vertically
upwards and rises to a height of 10 m. Calculate
(a) The velocity with which the
object was thrown upwards.
(b) The time taken by the object
to reach the highest point.
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Two bodies of masses 4 kg and 5
kg are acted upon the same force. If the acceleration of the lighter body is 3
ms-2, then find the acceleration produced in heavier body. What will
be the acceleration when same force is applied on both bodies tied together?
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(a) Distinguish between G and g.
(b) What is the effect of shape
of earth on value of g?
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Two friends were playing 'catch
the ball' in a park. 'A' was able to catch the ball comfortably without hurting
himself, while 'B' was hurt every time he caught a ball. Finally B asked A how he
could catch the ball with ease. A explained the phenomena to B. B thanked him.
(a) Why was A not hurt while
catching the ball?
(b) Compare and contrast the
values of A and B.
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(a) How are new varieties of
poultry birds with desired traits produced?
(b) Mention any four desirable
traits for which new varieties are produced.
(c) List the management
practices that are common between dairy and poultry farming.
Or
(a) Write a short note on marine
fisheries.
(b) Which factors should be
taken into consideration for fish culture?
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(i) Explain why is it difficult
to walk on sand?
(ii) Why is the recoil of a
heavy gun, on firing, not so strong as that of a light gun using the same
cartridge?
(iii) A constant force acts on
an object of 5kg for a period of 2 s. It increases the velocity of an object
from 3 m/s to7 m/s. Find the magnitude of the applied force. Now if the force
was applied for a period of 5 s, what would be the final velocity of the
object?
Or
(a) Derive an expression to
prove the law of conservation of momentum.
(b) Why does a karate expert
suddenly reduce the speed of his hand while striking a slab of ice? Explain
with reference to Newton's law of motion.
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Give reason for the following observations.
(a) Naphthalene balls disappear
with time without leaving any solid.
(b) We can get the smell of
perfume sitting several metres away.
(c) Water at room temperature is
a liquid.
(d) An iron almirah is a solid
at room temperature.
(e) Ice at 273 K is more
effective in cooling than water at the same temperature.
Or
(a) Dry ice is compressed under
high pressure. What happens to it when pressure is released?
(b) Define
(i) Melting point
(ii) Fusion
(c) Osmosis is a special kind of
diffusion, Comment.
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(a) Action of heat on blue
vitriol is a physical as well as chemical change. Justify.
(b) How would you separate a
mixture of NH4Cl and I2?
(c) How can you prove that air
is a mixture?
Or
Give an example each for the
mixture having following characteristics. Suggest a suitable method to
separate the components of these mixtures.
(a) A volatile and non-volatile component.
(b) Two volatile components with
appreciable difference in boiling points.
(c) Two immiscible liquids.
(d) One of the components changes
directly from solid to gaseous state.
(e) Two or more coloured constituents
soluble in some solvent.
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Answer the following questions
(a) What are the differences between
the terms 'distance' and 'displacement'?
(b) An object has moved through
a distance, can it have zero displacement? If yes, support your answer with an
example.
(c) A bus decreases its speed
from 80 km/h to 60 km/h in 5 s. Find the acceleration of the bus.
Or
Draw the velocity-time graph from the
data given below
|
Time(s)
|
2
|
4
|
6
|
8
|
10
|
12
|
14
|
|
Velocity (m/s)
|
5
|
10
|
15
|
20
|
20
|
10
|
0
|
(a) What type of motion is represented
by the object during 0-6 seconds?
(b) Find the acceleration in the
first 6 seconds.
(c) Using graph, calculate the
distance travelled between 6 to 8 seconds.
(d) Calculate retardation during
12-14 seconds.
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Name the tissue responsible for
flexibility in plants. How would you differentiate it from other permanent
tissues?
Or
Describe
structure and function of different types of epithelial tissues.
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