ADVANCED ACADEMY, INDORE
Date: 24.01.2022
Day: Monday
Printed Pages-03
II Periodic Test -2021-22
Class – X
Subject – Science
Time: 2 hrs.
Max. Marks-40
General Instructions:
1. The Question Paper contains five sections.
2. Section-A has 4 questions of 1 mark each, Section-B has 5 questions of 2 marks each, Section-C has 4 questions
of 3 marks each, Section-D has 2 questions of 5 marks each and Section-E has 1 case based question of 4 marks.
3. Internal choices have been provided in some questions. A student has to attempt only one of the alternatives in
such questions.
4. All questions are compulsory.
Section-A
Q.1
Identify the circuit in the figures given below in which the electrical components have been properly
connected.
1
Q.2
Q.3
(a)
(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)
A current of 4.8 A is flowing in a conductor. The number of electrons passing per second through the
conductor will be
(a) 3 × 1020
(b) 76.8 × 10 20
(c) 7.68 × 10 -19
(d) 3 × 1019
Identify the structural isomer of cyclobutane.
C
C
C
C
(b)
C
C
C
1
1
C
C
C
(c)
C
C
C
C
(d)
C
C
C
C
Q.4
Which of the following is correct homologous series of alkyne?
(a) C2H6, C3H6, C4H10
(b) C2H2, C3H4, C4H6
(c) C2H2, C3H6, C4H8
(d) C2H4, C3H6, C4H8
1
Q.5
Q.6
Q.7
Q.8
Q.9
Q.10
Q.11
Q.12
Q.13
Q.14
Q.15
Section-B
V-I graph for a metallic wire at two different temperatures
Which of the two temperatures is higher and why?
and
are shown in the figure given below.
2
Derive an expression for power in terms of current and resistance.
2
Explain the characteristic features seen in carbon which enable it to form large number of compounds.
2
Name the functional group present in the following compounds.
2
(a) CH3 – CH2 – CH2 – COOH
(b) CH3 – CO – CH3
(c) CH3 – CH2 – OH
(d) CH3 – CH2 – CH2 – CH2 – Cl
Give reason:
2
(a) Plastics are non-biodegradable.
(b) If all the waste we generate is biodegradable, will this have no impact on the environment?
Section-C
(a)
Calculate the resistance of a metal wire of length 2 m and area of cross section 1.55 x10-6 m², if the
resistivity of the metal be 2.8 × 10-8 Ω m.
(b)
Why are alloys commonly used in electrical heating devices? Give reason.
3
(a)
Carbon has 4 electrons in its outermost shell and can gain or lose 4 electrons to attain noble gas
configuration. But it forms covalent bond by sharing electrons with the atoms of other elements.
Justify this statement giving reasons.
3
(b)
How many covalent bonds are there in:
(i) CH3Cl
(ii) C2H6
Explain the phenomenon of ozone depletion. What are the factors responsible for it? What are its
consequences?
3
(a)
Write two characteristics of energy transfer in the biosphere.
(b)
The following organisms form a food chain Rat, Grass, Snake, Peacock. Which of these will have the
highest concentration of non-biodegradable chemicals. Name and define the phenomenon associated
with it.
3
Section-D
(a)
In a house, an electric bulb of 60 W is used for 15 hours and an electric heater of 750 W is used for
10 hours every day. Calculate the cost of using the bulb and the heater for 30 days if the cost of 1 unit
of electrical energy is ` 4.
(b)
List the two advantages of connecting electrical devices in parallel with an electrical source instead of
connecting them in series.
OR
(a)
Two wires A and B are of equal length and have equal resistances. If the resistivity of A is more than
that of B, which wire is thicker and why?
(b)
For the electric circuit given below, calculate
(i) current in each resistor,
(ii) total current drawn from the battery, and
(iii) equivalent resistance of the circuit.
5
Answer the following:
(a)
Bond formed by carbon with most of the other elements is very strong. Why?
(b)
Show the covalent bond formation in CO2 molecule.
(c)
Write the electron dot structure of:
(i) ethane
(ii) cyclopropane
5
(d)
(e)
Q.16
Draw the structures of all possible isomers of pentane.
List two characteristics of homologous series.
OR
Answer the following:
(a)
Diamond has high melting point. Why?
(b)
Most carbon compounds are poor conductors of electricity. Justify this statement
(c)
Kerosene does not decolorise bromine water while cooking oils do. Why?
(d)
A cyclic compound ‘X’ has molecular formula C6H6. It is unsaturated and burns with sooty flame.
Identify X and write its structural formula.
(e)
Draw the electron dot structure of ethene and ethyne.
Section-E
Read the passage given below and answer the following questions from 16(a) to 16(d). Grazing food chains
are directly dependent upon solar radiations as the primary source of energy. Green plants (or producers) form
the first trophic level of the food chain. They synthesize their food by the process of photosynthesis.
Herbivores or primary consumers feed upon the producers and form the second trophic level. Herbivores are
eaten by carnivores of different categories. These are longer food chains.
1x4=4
Given below are 5 grazing food chains operating in the nature.
(a)
(b)
(c)
(d)
Select the option that correctly identifies P, Q and R.
P
Q
R
(i) Frog
Deer
Aquatic insects
(ii) Frog
Elephant
Phytoplankton
(iii)Tadpole
Deer
Zooplankton
(iv) Dog
Elephant
Algae
According to the given food chains which of the following animals is both secondary and tertiary
consumer?
(i) Rabbit
(ii) Tiger
(iii)Eagle
(iv) Small fish
Top consumer in which of the following food chains will have the maximum energy?
(i) Food chain A
(ii) Food chain B
(iii)Food chain C
(iv) Food chain D
If energy present in producers of food chain D is 20,000 KJ. Then amount of energy present in its
secondary consumer will be
(i) 2000 KJ
(ii) 20 KJ
(iii) 2 KJ
(iv) 200 KJ
******