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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
Take MCQ Science Test
1.
The ion formed by dissolution of H+ in water is called _______________
2.
The equilibrium attained during the melting of ice is known as ___________.
3.
When lithium metal is placed in hydrochloric acid, ________ gas is evolved.
4.
The radio isotope of ________ helps to increase the productivity of crops.
5.
________ has the greatest penetration power.
6.
One roentgen is equal to ____________ disintegrations per second
7.
Ethanoic acid turns _______ litmus to _________
8.
An atom or a group of atoms which is responsible for chemical characteristics of an organic compound is called ____________.
9.
If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in _____
10.
Rapid back and forth motion of a particle about its mean position is called _____
11.
On dipping a pH paper in a solution, it turns into yellow. Then the solution is basic.
12.
Periodical removal of one of the products of a reversible reaction increases the yield.
13.
At the equilibrium of a reversible reaction, the concentration of the reactants and the products will be equal.
14.
The pH of rain water containing dissolved gases like SO3, CO2, NO2 will be less than 7.
15.
Natural uranium U-238 is the core fuel used in a nuclear reactor.
16.
Nuclear fusion is more dangerous than nuclear fission.
17.
Elements having atomic number greater than 83 can undergo nuclear fusion.
18.
The Velocity of sound is high in gases than liquids
19.
The velocity of sound is independent of temperature.
20.
Sound can travel through solids, gases, liquids and even vacuum.
21.
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
22.
NH4OH(aq) + CH3COOH(aq) → CH3COONH4(aq) + H2O(l)
23.
Henry Becquerel
24.
Fuel
25.
India’s first atomic power station
26.
Soap
27.
Unsaturated
28.
Heterocyclic
29.
Ultrasonic
30.
Infrasonic
31.
Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of __________.
large surface area
high pressure
high concentration
high temperature
32.
33.
Photolysis is a decomposition reaction caused by __________
heat
electricity
light
mechanical energy
34.
H2(g) + Cl29(g) → 2HCl(g) is a
Decomposition Reaction
Combination Reaction
Single Displacement Reaction
Double Displacement Reaction
35.
Kamini reactor is located at __________
Kalpakkam
Koodankulam
Mumbai
Rajasthan
36.
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
37.
Proton - Proton chain reaction is an example of__________
Nuclear fission
\(\alpha\) - decay
Nuclear fusion
\(\beta\) - decay
38.
Gamma radiations are dangerous because
it affects eyes & bones
it affects tissues
it produces genetic disorder
it produces enormous amount of heat
39.
Unit of radioactivity is _____________
roentgen
curie
becquerel
all the above
40.
Man-made radioactivity is also known as ___________.
Induced radioactivity
Spontaneous radioactivity
Artificial radioactivity
a & c
41.
TFM in soaps represents ___________ content in soap
mineral
vitamin
fatty acid
carbohydrate
42.
Which of the following are used as an aesthetics?
Carboxylic acids
Ethers
Esters
Aldehydes
43.
Rectified spirit is an aqueous solution which contains about _______ of ethanol
95.5 %
75.5 %
55.5 %
45.5 %
44.
C2H5OH + 3O2 → 2CO2 + 3H2O is a
Reduction of ethanol
Combustion of ethanol
Oxidation of ethanoic acid
Oxidation of ethanal
45.
The secondary suffix used in IUPAC nomenclature of an aldehyde is ____
- ol
– oic acid
– al
- one
46.
The molecular formula of an open chain organic compound is C3H6. The class of the compound is
alkane
alkene
alkyne
alcohol
47.
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
48.
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
49.
The frequency, which is audible to the human ear is
50 kHz
20 kHz
15000 kHz
10000 kHz
50.
When a sound wave travels through air, the air particles
vibrate along the direction of the wave motion
vibrate but not in any fixed direction
vibrate perpendicular to the direction of the wave motion
do not vibrate
1.
( )
Hydronium ion
2.
( )
physical equilibrium
3.
( )
hydrogen
4.
( )
P- 32
5.
( )
Gamma rays
6.
( )
3.7 x 1010
7.
( )
Blue, Red
8.
( )
functional group
9.
( )
South to north
10.
( )
Vibration
11.
False
Correct Statement : On dipping a pH paper in a solution, it turns into yellow. Then the solution is acidic.
12.
True
13.
False
Correct Statement : At the equilibrium of a reversible reaction, the concentration of the reactants and the products will be constant.
14.
True
15.
False
Correct statement : Natural uranium U-235 is the core fuel used in a nuclear reactor.
16.
False
Correct statement : Nuclear fission is more dangerous than nuclear fusion. ( However fusion produces more heat energy than fission, fission reaction emits harmful radiation)
17.
False
Correct Statement : Element having atomic number greater than 83 can undergo nuclear fission.
18.
False
Correct Statement : The velocity of sound is high in liquids than gases.
19.
False
Correct Statement : The velocity of sound is dependent of temperature.
20.
False
Correct Statement : Sound can travel through solids, gases, liquids but not in vacuum.
21.
Single Displacement
22.
Neutralization
23.
Natural radioactivity
24.
uranium
25.
Tarapur
26.
Potassium stearate
27.
Ethene
28.
Furan
29.
22 kHz
30.
10 Hz
31.
(a)
large surface area
32.
(c)
33.
(c)
light
34.
(b)
Combination Reaction
35.
(a)
Kalpakkam
36.
(b)
8, 4
37.
(c)
Nuclear fusion
38.
(c)
it produces genetic disorder
39.
(d)
all the above
40.
(d)
a & c
41.
(c)
fatty acid
42.
(b)
Ethers
43.
(a)
95.5 %
44.
(b)
Combustion of ethanol
45.
(c)
– al
46.
(b)
alkene
47.
(c)
25 m
48.
(d)
none of these
49.
(b)
20 kHz
50.
(a)
vibrate along the direction of the wave motion
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
