KENDRIYA
VIDYALAYA, ALIGANJ LUCKNOW
HOLIDAY
HOME-WORK (2014-15 SUMMER VACATION)
CLASS
XD SCIENCE L CHEMISTRY
1. What
is meant by a chemical reaction ? Explain with the help of an example.
2. Give
one example each of a chemical reaction characterised by(a) evolution of gas (b)change
in color (c)formation of precipitate,(d)change in temperature
(e)
change in state
3. Give
eight examples of various chemical reactions keep on occuring in our daily life
4. Define
exothermic and endothemic reaction with examples .
5. What
type chemical reaction takes place when
a. A
magnesium wire is burnt in air.
b. Lime
stone is heated.
c. Electricity
is passed through acidulated water.
CLASS
XD SCIENCE :
L
BIOLOGY
1. What
is photosynthesis,write a chemical equation to show the process of
photosynthesis and also explain the process of photosynthesis
2. Describe
the human digestive system and explain briefly how digestion of cabohydrate
,fats and protein get digested in human beings ?
3. Make
a chart or model of any one of the following. Nutrition in
amoeba, human heart, human brain, structure of stomata, digestive system of human, respiratory system
of man, excretory system of human, structure of nephron, structure of neuron,
endocrine gland in man etc.
4. Describe
various types of heterotrophic nutrition .
5. Write
an assignment on life processes .
CLASS XD SCIENCE L
PHYSICS
1. A
simple electric circuit has 24 V Battery and a resistor of 60 ohms .What will
be the current in the circuit ? The resistance of the connecting wires is
negligible
2. Describe
an activity to show that resistance of a conductor is (i) directly proportional
to its length (ii) and inversely proportional to its area of cross section..
3. What is the unit of electric charge?
4.
What
is resistance?
5.
The
potential difference applied across a wire is doubled, how does the resistance
of the wire is affected?
6.
State
ohm’s law. Give mathematical expression for the same.
7.
A
wire is stretched to double its length how does the resistance of the wire is
affected?
8. On
what factor does the resistance of a wire depends?
9. Define
1 Volt.
10.
Why are copper wires used as connecting
wires?
11.
What is the resistance of an ideal
ammeter?
12.
What is the resistance of an ideal
Voltmeter?
13.
What happens to the current in a circuit
if its resistance is doubled?
14.
Compare how an Ammeter
and a Voltmeter are connected in a circuit
15.
What is the unit of
electric current
(a)How many milli amperes are there in 2
ampere ? (b)How many microampere are there in one ampere ?
