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NATIONAL COMPETATIVE POTENTIAL ASSESMENT
[Question paper is to be returned along with bubble sheet]
Standard: X (Tenth)

Time Allowed

: 2 Hrs
...
2013

Maximum Marks : 240

Student’s Name: ______________________________ Roll No
...
There are 4 Sections (1) Physics - 20 Q
...
(3) Mathematics - 20 Q
...

2
...

3
...
Which means that for correct answer 3 mark will be awarded &
for wrong answer 1 mark will be deducted
...

4
...

5
...

6
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It will be treated as wrong answer
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You may do rough work on the last blank page
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PHYSICS
CHOOSE THE CORRECT OPTION:

The displacement of a particle is a function of time
as shown in figure
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DISTANCE

1
...


3
...


1

2 3 4
TIME

X

(a) the particle starts with a certain velocity, but
the motion is retarded and finally the particle stops
...

(c) the acceleration of the particle is constant
throughout
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The kinetic energy acquired by a mass m in
travelling a certain distance d, starting from rest,
under the action of a constant force is directly
proportional to
(a) m
(b) independent of m

7
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t (in ºC)

(a) O Heat supplied
t (in ºC)

(c) 1 / m
(d) m
If the earth loses its gravity, then for a body
(a) both mass and weight become zero
(b) mass becomes zero but not the weight
(c) neither mass nor weight become zero
(d) weight becomes zero, but not the mass
A boy is carrying a bucket of water in one hand
and a wooden block in the other hand
...

(a) Both A and R are true and R is the correct
explanation of A
(b) Both A and R are true and R is not the correct
explanation of A
(c) A is true but R is false
(d) A is false but R is true
A block of ice at –10ºC is slowly heated and
converted to steam at 100ºC
...
They
are heated to same temperature, then
(a) both spheres will expand equally
(b) hollow sphere will expand more than solid one
(c) solid sphere will expand more than the hollow one
(d) none of the above
10
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Pairs (A, B),
(B, D) and (D, A) show electrostatic attraction
while pairs (B, C) and (D, E) show repulsion
...
Two resistances R1 and R 2 are joined with two
batteries of emf E1 and E 2 as shown in figure
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17
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This can be ascribed to
(a) the fact that stars do not emit light continuously
(b) varying absorption of star light by their own
atmosphere
(c) varying absorption of star light by the earth’s
atmosphere
(d) the refractive index fluctuations in the earth’s
atmosphere

(a)

12
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14
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16
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When a ray of light enters a glass slab form air
...
Mirage is observed in a desert due to the
phenomenon of
(a) interference
(b) total internal reflection
(c) scattering
(d) double refraction
20
...
The electrons are
(a) concentrated at the centre of the sphere
(b) concentrated at the bottom of the sphere
(c) uniformly distributed in the sphere’s interior
(d) uniformly distributed on the sphere’s surface

R1

E1

The equivalent resistance across A and B is
3r
2r
2r

CHEMISTRY
CHOOSE THE CORRECT OPTION:

Largest number of molecules are present in
(a) 44 gm of carbon dioxide
(b) 28 gm of carbon monoxide
(c) 36 gm of water
(d) 64 gm of sulphur dioxide
22
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How many grams of methanol CH 3OH must be
added to 2 moles of H 2 O to make a solution
containing equal numbers of molecules of H 2 O
and CH 3OH ?
(a) 2 grams
(b) 16 grams
(c) 32 grams
(d) 64 grams
21
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The number of neutrons in
element ‘A’ will be …
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Which among the following compounds has a
linear structure?
(a) Hydrogen sulphide (b) Water
(c) Sulphur dioxide
(d) Carbon dioxide
26
...

(a) HCl
(b) N 2
(c) NH3
(d) CO 2
24
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28
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30
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32
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(a) Normal salt
(b) Mixed salt
(c) Complex
(d) Double salt
40
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(a) Dehydration
(b) Oxidation
(c) Decomposition
(d) Reduction

The components of foods which is primarily used
for generating and building tissues is …
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(a) Isomers
(b) Allotropes
(c) Polymers
(d) Electrolytes
Soaps are …
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(a) The same atomic size
(b) The same electronic configuration
(c) The same number of electrons in the outer most
orbit of their atoms
(d) The same number of isotopes
Which of the following metals would not evolve
hydrogen from dilute nitric acid?
(a) Magnesium
(b) Iron
(c) Copper
(d) Zinc
Ordinary white phosphorus consists of phosphorus
molecules of formula …
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MATHEMATICS
CHOOSE THE CORRECT OPTION:

1
2
2013
+
+
= 1 then find the value
a + 1 b + 2 c + 2013
a2
b2
c2
of 2
+ 2
+ 2
a + a b + 2b c + 2013c
(a) 2013
(b) 2010
(c) 2
(d) 0
2
2
42
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In an examination the ratio of the number of
successful candidates and unsuccessful candidates
is 4 : 1
...
Find the number of
candidates who appeared in the examination
originally
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{

The compound which can be used to prepare
idoform is …
...
The oxidation number of sulphur in H 2SO 4 is …
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37
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(a) 4
(b) 2
(c) 6
(d) zero
Which one of the following furnaces can produce
the highest temperature?
(a) Blast furnace
(b) Reverberatory furnace
(c) Muffle furnace
(d) Electric furnace
The atomic number of an element is 11
...

(a) 2
(b) 8
(c) 10
(d) 1
The chemical name of lunar caustic is …
...
When potassium chromate
is added to its hot solution a yellow precipitate is
obtained
...
Find the value of 1 − 1 − (1 − x )

 when


x = 0⋅2
...


35
...


The roots of the equation x3 + 4 x 2 + x − 6 = 0 are
a, b, c
...


(a) 10

(b) –10
(c) –64
(d) 118
tn − 1
46
...

tn + 1
Find the numerical value of t2013
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Number of values of x ∈ {1, 2, 3,
...
In
a rectangular room of measurements
12m × 4m × 3m
...
Find the circumcentre of the triangle formed by
(5, − 8), (2, − 9) and (2, 1)

(a) (2, –9)

3

(b) (2, –4) (c) (0, 0)

(d) (–2, 4)

50
...
Given that
ABE = 56º , BCE = 50º and
DAE = 37º then AED is

BIOLOGY
CHOOSE THE CORRECT OPTION:

Which non-toxic, fast growing cyanobacterium is
cultivated in tanks as a protein-rich animal feed?
(a) Stigonema
(b) Spirulina
(c) Nostoc
(d) oscillatoria
62
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Clay
B
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Sand
D
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Certain bacteria are able to thrive under extreme
environmental conditions such as absence of
oxygen, high salt concentration, high temperature
or highly acidic environment
...
The average volume of a eucaryotic cell is
61
...
If P is 20% less than q, by what percentage is q
more than P
1
(a) 20%
(b) 80%
(c) 25%
(d) %
4
52
...
The
number of sides of the polygon is
(a) 15
(b) 12
(c) 9
(d) 23
53
...
The sum of the possible x-coordinates
for the 4th vertex is:
(a) 2
(b) –5
(c) 11
(d) 8
th
54
...
…?
(a) 7
(b) 6
(c) 5
(d) 0
55
...
Find the distance from the midpoint
of AB to the midpoint of CD
...
If
+
+
+
...
This famous scientist worked with a mould called
Neurospora crassa and came to the conclusion that
the characteristic function of the gene was to
supervise the formation of a particular enzyme
...
Which of the following hominids were the first to
use fire?
(a) Homo erectus
(b) Homo habilis
(c) Australopithecus boisei
(d) Proconsul
68
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=x

2

then the value of ( x + 2 x + 1) is

(a) 2012
57
...
Sum of the co-efficients of the product of the
polynomial ( x − 1) ( x − 2) ( x − 3) ( x − 4)
...
If 2012, 2013 are the roots of the equation
( x − 1001) ( x − 1002) = c, c ≠ 0 then the roots of the
equation ( x − 2012) ( x − 2013) + c = 0 are
(a) 2012, 2013
(b) 1001, 2013
(c) 1001, 1002
(d) none of these
60
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70
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72
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74
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CHS-I
1
...
IR-8
2
...
RR-2I
3
...
HB-4
4
...
Bajra
(a) A-2, B-3, C-5, D-1 (b) A-5, B-4, C-3, D-2
(c) A-3, B-1, C-2, D-5 (d) A-1, B-3, C-4, D-2
The greatest diversity of animal and plant species
occurs in
(a) Heavily polluted rivers
(b) Tropical moist forests
(c) Temperate deciduous forests
(d) Deserts and savannas
Which one of the following is the best strategy for
environment-friendly, sustainable development in
Indian agriculture?
(a) Mixed cropping, organic manures, nitrogenfixing plants and pest-resistant crop varieties
(b) Wider popularization of high-yielding crop
varieties, better and more frequent irrigation and
increased frequency of aerial sprays of inorganic
fertilizers and pesticides
(c) Expansion of cultivable land, increased use of
superphosphate, urea and effective biocides
(d) Improved farm implements and machinery, use
of potent insecticides to minimize post-harvest
grain losses and monoculture cropping practices
Proteins on heating change from
(a) Solid to gas directly without changing first into
liquid
(b) Solid to liquid
(c) Liquid to gas
(d) Liquid to solid
The m-RNA is formed
(a) From the ribosomes on endoplasmic reticulum
(b) By free ribosomes
(c) In the nucleus
(d) From DNA in the nucleus

Standard: X (Tenth)

75
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77
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79
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5

These are a group of very small intra-cellular
bacteria
...
Some of the diseases caused by them are
typhus, trench fever and Q fever
...

(a) Viroids
(b) Bacteriods
(c) Rickettsia
(d) Mycoplasma
Which biologist is best known for putting forth the
‘biogenetic law’, also known as the ‘theory of
recapitulation’?
(a) Konrad Von Gesner (b) Earnst Haeckel
(c) John Kendrew
(d) Walther Flemming
Nature has an inherent mechanism whereby
harmful genes are eliminated from the population
by causing the death of the bearer of such harmful
genes
...
What is this phenomenon known as?
(a) Genetic evolution
(b) Genetic involution
(c) Genetic drift
(d) Genetic pollution
What is the name given to the process when the
viral nucleic acid is incorporated into a bacterial
chromosome to become an integral part of it?
(a) Transformation
(b) Reverse transcription
(c) Lysogeny
(d) Transduction
Which one of the following is caused by the
expression of a recessive gene present on sex
chromosome?
(a) Muscular dystrophy
(b) Nervous shock
(c) Rheumatism
(d) Cerebral haemorrhage
Which of the following is a living fossil?
(a) Fungus
(b) Green algae
(c) Blue green algae
(d) Ginkgo



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