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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.
Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of __________.
large surface area
high pressure
high concentration
high temperature
2.
3.
Which of the following represents a precipitation reaction?
A(s) + B(s) → C(s) + D(s)
A(s) + B(aq) → C(aq) + D(l)
A(aq) + B(aq) → C(s) + D(aq)
A(aq) + B(s) → C(aq) + D(l)
4.
Which of the following is not an “element + element → compound” type reaction?
C(s) + O2(g) → CO2(g)
2K(s) + Br2(l) → 2KBr(s)
2CO(g) + O2(g) → 2CO2(g)
4Fe(s) + 3O2(g) → 2Fe2O3(s)
5.
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
6.
7.
The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?
Neutralisation
Combustion
Precipitation
Single displacement
8.
A reaction between carbon and oxygen is represented by C(s) + O2(g) → CO2(g) + Heat. In which of the type(s), the above reaction can be classified?
(i) Combination Reaction
(ii) Combustion Reaction
(iii) Decomposition Reaction
(iv) Irreversible Reaction
i and ii
i and iv
i, ii and iii
i, ii and iv
9.
Photolysis is a decomposition reaction caused by __________
heat
electricity
light
mechanical energy
10.
H2(g) + Cl29(g) → 2HCl(g) is a
Decomposition Reaction
Combination Reaction
Single Displacement Reaction
Double Displacement Reaction
11.
Which of the following is/are correct?
i. Chain reaction takes place in a nuclear reactor and an atomic bomb.
ii. The chain reaction in a nuclear reactor is controlled
iii. The chain reaction in a nuclear reactor is not controlled
iv. No chain reaction takes place in an atom bomb
(i) only correct
(i) & (ii) are correct
(iv) only correct
(iii) & (iv) are correct
12.
Kamini reactor is located at __________
Kalpakkam
Koodankulam
Mumbai
Rajasthan
13.
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
14.
Proton - Proton chain reaction is an example of__________
Nuclear fission
\(\alpha\) - decay
Nuclear fusion
\(\beta\) - decay
15.
Which of the following statements is/are correct?
i. \(\alpha\) particles are photons
ii. Penetrating power of \(\gamma \) radiation is very low
iii. Ionization power is maximum for α rays
iv. Penetrating power of \(\gamma \) radiation is very high
(i) & (ii) are correct
(ii) & (iii) are correct
(iv) only correct
(iii) & (iv) are correct
16.
_____________ aprons are used to protect us from gamma radiations
Lead oxide
Iron
Lead
Aluminium
17.
Gamma radiations are dangerous because
it affects eyes & bones
it affects tissues
it produces genetic disorder
it produces enormous amount of heat
18.
____________ isotope is used for the treatment of cancer.
Radio Iodine
Radio Cobalt
Radio Carbon
Radio Nickel
19.
In which of the following, no change in mass number of the daughter nuclei takes place
i) \(\alpha\) decay
ii) \(\beta\) decay
iii) \(\gamma \) decay
iv) neutron decay
(i) is correct
(ii) and (iii) are correct
(i) & ( iv) are correct
(ii) & (iv) are correct
20.
21.
Unit of radioactivity is _____________
roentgen
curie
becquerel
all the above
22.
Man-made radioactivity is also known as ___________.
Induced radioactivity
Spontaneous radioactivity
Artificial radioactivity
a & c
23.
Which of the following statements is wrong about detergents?
It is a sodium salt of long chain fatty acids
It is sodium salts of sulphonic acids
The ionic part in a detergent is –SO3–Na+
It is effective even in hard water.
24.
TFM in soaps represents ___________ content in soap
mineral
vitamin
fatty acid
carbohydrate
25.
Which of the following are used as an aesthetics?
Carboxylic acids
Ethers
Esters
Aldehydes
26.
Rectified spirit is an aqueous solution which contains about _______ of ethanol
95.5 %
75.5 %
55.5 %
45.5 %
27.
C2H5OH + 3O2 → 2CO2 + 3H2O is a
Reduction of ethanol
Combustion of ethanol
Oxidation of ethanoic acid
Oxidation of ethanal
28.
Which of the following pairs can be the successive members of a homologous series?
C3H8 and C4H10
C2H2 and C2H4
CH4 and C3H6
C2H5OH and C4H8OH
29.
The secondary suffix used in IUPAC nomenclature of an aldehyde is ____
- ol
– oic acid
– al
- one
30.
The IUPAC name of an organic compound is 3-Methyl butan-1-ol. What type compound it is?
Aldehyde
Carboxylic acid
Ketone
Alcohol
31.
The molecular formula of an open chain organic compound is C3H6. The class of the compound is
alkane
alkene
alkyne
alcohol
32.
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
33.
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
34.
If a sound wave travels with a frequency of 1.25 x 104 Hz at 344 ms-1, the wavelength will be
27.52 m
275.2 m
0.02752 m
2.752 m
35.
The velocity of sound in air at a particular temperature is 330 ms-1. What will be its value when temperature is doubled and the pressure is halved?
330 ms-1
165 ms-1
330 x \(\sqrt { 2 } \) ms-1
320/\(\sqrt { 2 } \) ms-1
36.
The frequency, which is audible to the human ear is
50 kHz
20 kHz
15000 kHz
10000 kHz
37.
Velocity of sound in a gaseous medium is 330 ms-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is
330 ms-1
660 ms-1
156 ms-1
990 ms-1
38.
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
39.
Kilowatt hour is the unit of
resistivity
conductivity
electrical energy
electrical power
40.
In a simple circuit, why does the bulb glow when you close the switch?
The switch produces electricity
Closing the switch completes the circuit.
Closing the switch breaks the circuit.
The bulb is getting charged.
41.
SI unit of resistance is
mho
joule
ohm
ohm meter
42.
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.
43.
The number of products formed in a synthesis reaction is _________
44.
The normal pH of human blood is _________
45.
When lithium metal is placed in hydrochloric acid, ________ gas is evolved.
46.
If the radiation exposure is 100 R, it may cause ______________.
47.
ZXA \(\rightarrow\) ZYA This reaction is possible in ______________ decay.
48.
zYA \(\rightarrow\) z+1YA + X ; Then X is___________
49.
Positron is an____________.
50.
(Saturated / Unsaturated) ___________ compounds decolourize bromine water.
1.
(a)
large surface area
2.
(c)
3.
(c)
A(aq) + B(aq) → C(s) + D(aq)
4.
(c)
2CO(g) + O2(g) → 2CO2(g)
5.
(d)
i and iv
6.
(b)
7.
(c)
Precipitation
8.
(d)
i, ii and iv
9.
(c)
light
10.
(b)
Combination Reaction
11.
(b)
(i) & (ii) are correct
12.
(a)
Kalpakkam
13.
(b)
8, 4
14.
(c)
Nuclear fusion
15.
(d)
(iii) & (iv) are correct
16.
(c)
Lead
17.
(c)
it produces genetic disorder
18.
(b)
Radio Cobalt
19.
(b)
(ii) and (iii) are correct
20.
(b)
21.
(d)
all the above
22.
(d)
a & c
23.
(a)
It is a sodium salt of long chain fatty acids
24.
(c)
fatty acid
25.
(b)
Ethers
26.
(a)
95.5 %
27.
(b)
Combustion of ethanol
28.
(a)
C3H8 and C4H10
29.
(c)
– al
30.
(d)
Alcohol
31.
(b)
alkene
32.
(c)
25 m
33.
(d)
none of these
34.
(c)
0.02752 m
35.
(c)
330 x \(\sqrt { 2 } \) ms-1
36.
(b)
20 kHz
37.
(a)
330 ms-1
38.
(a)
vibrate along the direction of the wave motion
39.
(c)
electrical energy
40.
(b)
Closing the switch completes the circuit.
41.
(c)
ohm
42.
(b)
Rate of change of charge is current.
43.
( )
one
44.
( )
7.4 (7.3 - 7.45)
45.
( )
hydrogen
46.
( )
Leukemia
47.
( )
Gamma
48.
( )
\(-1^{e^{0}}\)
49.
( )
positive charge electron +1e0
50.
( )
Unsaturated
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