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Published on: 19/10/2025
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
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1.
A renewable source of energy is
petroleum
coal
nuclear fuel
trees
2.
Which of the following is / are a fossil fuel?
i. Tar
ii. Coal
iii. Petroleum
i only
i only ii
ii and iii
i, ii and iii
3.
4.
9 : 3 : 3 : 1 ratio is due to
Segregation
Crossing over
Independent assortment
Recessiveness
5.
rDNA is a
vector DNA
circular DNA
recombinant of vector DNA and desired DNA
satellite DNA
6.
Which of the following is used to produce products useful to humans by biotechnology techniques?
enzyme from organism
live organism
vitamins
both (a) and (b)
7.
Which one of the following is an IUCD?
Copper – T
Oral pills
Diaphragm
Tubectomy
8.
Male gametes in angiosperms are formed by the division of ___________
Generative cell
Vegetative cell
Microspore mother cell
Microspore
9.
The ‘use and disuse theory’ was proposed by __________.
Charles Darwin
Ernst Haeckel
Jean Baptiste Lamarck
Gregor Mendel
10.
Biogenetic law states that ___________
Ontogeny and phylogeny go together
Ontogeny recapitulates phylogeny
Phylogeny recapitulates ontogeny
There is no relationship between phylogeny and ontogeny
11.
A person who had met with an accident lost control of body temperature, water balance, and hunger. Which of the following part of brain is supposed to be damaged?
Medulla oblongata
cerebrum
pons
hypothalamus
12.
Bipolar neurons are found in
retina of eye
cerebral cortex
embryo
respiratory epithelium
13.
Metastasis is associated with
Malignant tumour
Benign tumour
Both (a) and (b)
Crown gall tumour
14.
World 'No Tobacco Day' is observed on
May 31
June 6
April 22
October 2
15.
The wall of human heart is made of
Endocardium
Epicardium
Myocardium
All of the above
16.
Water which is absorbed by roots is transported to aerial parts of the plant through
Cortex
Epidermis
Phloem
Xylem
17.
Mammals are ______________ animals.
Cold blooded
Warm blooded
Poikilothermic
All the above
18.
The segments of leech are known as
Metameres (somites)
Proglottids
Strobila
All the above
19.
A single displacement reaction is represented by X(s) + 2HCl(aq) → XCl2(aq) + H2(g). Which of the following(s) could be X. (i) Zn (ii) Ag (iii) Cu (iv) Mg. Choose the best pair.
i and ii
ii and iii
iii and iv
i and iv
20.
Deliquescence is due to __________
Strong affinity to water
Less affinity to water
Strong hatred to water
Inertness to water
21.
The number of periods and groups in the periodic table are__________.
6,16
7,17
8,18
7,18
22.
Oxygen is produced at what point during photosynthesis ?
when ATP is converted to ADP
when CO2 is fixed
when H2O is splitted
All of these
23.
The xylem and phloem arranged side by side on same radius is called _________
radial
amphivasal
conjoint
None of these
24.
In the nuclear reaction 6X12 \(\overset { \alpha \ decay }{ \longrightarrow } \) zYA, the value of A & Z.
8, 6
8, 4
4, 8
cannot be determined with the given data
25.
Gamma radiations are dangerous because
it affects eyes & bones
it affects tissues
it produces genetic disorder
it produces enormous amount of heat
26.
C2H5OH + 3O2 → 2CO2 + 3H2O is a
Reduction of ethanol
Combustion of ethanol
Oxidation of ethanoic acid
Oxidation of ethanal
27.
The secondary suffix used in IUPAC nomenclature of an aldehyde is ____
- ol
– oic acid
– al
- one
28.
Velocity of sound in the atmosphere of a planet is 500 ms-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be
17 m
20 m
25 m
50 m
29.
The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?
speed
frequency
wavelength
none of these
30.
Which of the following has the smallest mass?
6.023 × 1023 atoms of He
1 atom of He
2 g of He
1 mole atoms of He
31.
Kilowatt hour is the unit of
resistivity
conductivity
electrical energy
electrical power
32.
SI unit of resistance is
mho
joule
ohm
ohm meter
33.
Which of the following is correct?
Rate of change of charge is electrical power
Rate of change of charge is current.
Rate of change of energy is current.
Rate of change of current is charge.
34.
In the Given diagram, the possible direction of heat energy transformation is
A\(\leftarrow\)B, A\(\leftarrow\)C, B\(\leftarrow\)C
A\(\rightarrow\)B, A\(\rightarrow\)C, B\(\rightarrow\)C
A\(\rightarrow\)B, A\(\leftarrow\)C, B\(\rightarrow\)C
A\(\leftarrow\)B, A\(\rightarrow\)C, B\(\leftarrow\)C
35.
If a substance is heated or cooled, the linear expansion occurs along the axis of
X or –X
Y or –Y
both (a) and (b)
(a) or (b)
36.
If a substance is heated or cooled, the change in mass of that substance is
positive
negative
zero
none of the above
37.
In a myopic eye, the image of the object is formed
behind the retina
on the retina
in front of the retina
on the blind spot
38.
Power of a lens is –4D, then its focal length is
4m
–40m
–0.25 m
–2.5 m
39.
The unit of ‘g’ is m s-2. It can be also expressed as ______.
cms-1
Nkg-1
Nm2kg-1
cm2s-2
40.
In which of the following sport the turning of effect of force used
swimming
tennis
cycling
hockey
41.
_____________spinal nerves are present in rabbit.
42.
When lithium metal is placed in hydrochloric acid, ________ gas is evolved.
43.
DNA consists of two ____________ chains.
44.
_______ causes stomatal closure.
45.
__________ cells are undifferentiated mass of cells.
46.
Economically important crop plants with superior quality are raised by_________.
47.
Fertilization is __________ in humans
48.
A change in the environment that causes an animal to react is called _________
49.
__________ involves evaporative loss of water from aerial parts.
50.
Example for liquid in solid type solution is ______________
51.
________ and ________ are called inner transition elements
52.
Nuclear fusion is possible only at an extremely high temperature of the order of ____ K.
53.
________ has the greatest penetration power.
54.
(Saturated / Unsaturated) ___________ compounds decolourize bromine water.
55.
Atomicity of phosphorous is ___________
56.
The ratio of the potential difference to the current is known as ________.
57.
Amount of light entering into the eye is controlled by________
58.
The path of the light is called as_____________
59.
A man of mass 100 kg has a weight of ___________ at the surface of the Earth
60.
___________ is used to change the speed of car.
61.
ADH
62.
Growth hormone
63.
Parathormone
64.
Insulin
65.
Thyroxine
66.
Dihybrid ratio
67.
Down’s syndrome
68.
Allosome
69.
Diploid condition
70.
Autosomes
1.
(d)
trees
2.
(c)
ii and iii
3.
(b)
4.
(c)
Independent assortment
5.
(c)
recombinant of vector DNA and desired DNA
6.
(d)
both (a) and (b)
7.
(a)
Copper – T
8.
(a)
Generative cell
9.
(c)
Jean Baptiste Lamarck
10.
(b)
Ontogeny recapitulates phylogeny
11.
(d)
hypothalamus
12.
(a)
retina of eye
13.
(a)
Malignant tumour
14.
(a)
May 31
15.
(d)
All of the above
16.
(d)
Xylem
17.
(b)
Warm blooded
18.
(a)
Metameres (somites)
19.
(d)
i and iv
20.
(a)
Strong affinity to water
21.
(d)
7,18
22.
(c)
when H2O is splitted
23.
(c)
conjoint
24.
(b)
8, 4
25.
(c)
it produces genetic disorder
26.
(b)
Combustion of ethanol
27.
(c)
– al
28.
(c)
25 m
29.
(d)
none of these
30.
(b)
1 atom of He
31.
(c)
electrical energy
32.
(c)
ohm
33.
(b)
Rate of change of charge is current.
34.
(a)
A\(\leftarrow\)B, A\(\leftarrow\)C, B\(\leftarrow\)C
35.
(d)
(a) or (b)
36.
(c)
zero
37.
(c)
in front of the retina
38.
(c)
–0.25 m
39.
(b)
Nkg-1
40.
(c)
cycling
41.
( )
37 pairs of
42.
( )
hydrogen
43.
( )
polynucleotide
44.
( )
Abscissic acid
45.
( )
Stem
46.
( )
plant breeding
47.
( )
Internal
48.
( )
stimulus
49.
( )
Transpiration
50.
( )
Amalgam (or) mercury with sodium
51.
( )
Lanthanides, Actinides
52.
( )
107 to 109 K
53.
( )
Gamma rays
54.
( )
Unsaturated
55.
( )
4
56.
( )
resistance
57.
( )
Iris
58.
( )
ray of light
59.
( )
980 N
60.
( )
Acceleration
61.
Diabetes insipidus
62.
Acromegaly
63.
Tetany
64.
Diabetes mellitus
65.
Simple goitre
66.
9:3:3:1
67.
Trisomy 21
68.
23rd pair of chromosomes
69.
2n
70.
22 pairs of chromosome
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