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Published on: 05/12/2020
10th Standard Science English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021 Part - 1
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 Test1.
Wild life preservation society of India is located in_______
Delhi
Uttarakhand
Dehradun
Chattisgarh
2.
In Scratch, the characters are known as_________
Sprite
Stage
Element
Script
3.
World AIDS Day is observed on ______________
1st December
15th December
24th November
1st May
4.
________ is father of "Indian Green Revolution"
Dr. M. S. Swaminathan
Dr. Norman
Alec Jeffrey
Dr. Ian Wilmut
5.
______ is a growth inhibitor.
Auxin
GA
Cytokinin
Ethylene
6.
When ethanol reacts with acidified K2Cr2O7 the orange color of K2Cr2O7 changes to _____________
yellow
red
purple
green
7.
Minerals like __________ slowly penetrate in and replace the original organic tissue and forms a rock like fossil.
calcium
sodium
magnesium
silica
8.
The product formed when calcium oxide reacts with water is
Slaked lime
Carbon dioxide
Calcium oxide
Oxygen gas
9.
Natural uranium consists of _________ % of U235 and _______ % of U238.
0.72,99.28
99.28,0.72
77.28,72
72, 77.28
10.
What is the frequency range of audible sound?
20 Hz to 20 kHz
1.5 Hz to 20 kHz
10 Hz to 15 kHz
20 Hz to 25 kHz
11.
Hydrogen bonds between the nitrogeneous bases make the DNA molecule________
unstable
stable
unbalanced
disturbed
12.
The distance from the centre of the nucleus to the outer most electron in an ion is termed as _________ radii.
atomic
ionic
Covalent
both (b) and (c)
13.
Lack of menstruation generally indicates________
Pregnancy
Anemia
Amenorrhea
Over weight
14.
Pollination with the help of insects like honey bees, flies are called_________
Entomophilly
Anemophily
Hydrophily
Zoophily
15.
The _________are the largest of leucocytes.
neutrophil
monocyte
basophil
lymphocyte·
16.
The gravitational force between two objects becomes _______ when the masses of both objects are halved without altering the distance between them.
\(\frac{f}{4}\)
\(\frac{f}{2}\)
f
2f
17.
A cheap, conventional, commercial and inexhaustible source of energy is
hydropower
solar energy
wind energy
thermal energy
18.
The _____________ units form the backbone of the DNA.
5 Carbon sugar
Phosphate
Nitrogenous bases
Sugar phosphate
19.
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)
20.
Asexual reproduction takes place through budding in ___________
Amoeba
Yeast
Plasmodium
Bacteria
21.
The neurons which carries impulse from the central nervous system to the muscle fibre.
afferent neurons
association neurons
efferent neurons
unipolar neurons
22.
Coronary heart disease is due to
Streptococci bacteria
Inflammation of pericardium
Weakening of heart valves
Insufficient blood supply to heart muscles
23.
The wall of human heart is made of
Endocardium
Epicardium
Myocardium
All of the above
24.
The brain of leech lies above the
Mouth
Buccal Cavity
Pharynx
Crop
25.
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)
26.
A 25% alcohol solution means
25 ml alcohol in 100 ml of water
25 ml alcohol in 25 ml of water
25 ml alcohol in 75 ml of water
75 ml alcohol in 25 ml of water
27.
In the aluminothermic process the role of Al is _____.
oxidizing agent
reducing agent
hydrogenating agent
sulphurising agent
28.
Kamini reactor is located at __________
Kalpakkam
Koodankulam
Mumbai
Rajasthan
29.
TFM in soaps represents ___________ content in soap
mineral
vitamin
fatty acid
carbohydrate
30.
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
31.
The volume occupied by 1 mole of a diatomic gas at S.T.P is
11.2 liters
5.6 liters
22.4 liters
44.8 liters
32.
Kilowatt hour is the unit of
resistivity
conductivity
electrical energy
electrical power
33.
34.
1.
(c)
Dehradun
2.
(a)
Sprite
3.
(a)
1st December
4.
(a)
Dr. M. S. Swaminathan
5.
(d)
Ethylene
6.
(d)
green
7.
(d)
silica
8.
(a)
Slaked lime
9.
(a)
0.72,99.28
10.
(a)
20 Hz to 20 kHz
11.
(b)
stable
12.
(b)
ionic
13.
(a)
Pregnancy
14.
(a)
Entomophilly
15.
(b)
monocyte
16.
(a)
\(\frac{f}{4}\)
17.
(a)
hydropower
18.
(d)
Sugar phosphate
19.
(d)
both (a) and (b)
20.
(b)
Yeast
21.
(c)
efferent neurons
22.
(d)
Insufficient blood supply to heart muscles
23.
(d)
All of the above
24.
(c)
Pharynx
25.
(c)
A(aq) + B(aq) → C(s) + D(aq)
26.
(c)
25 ml alcohol in 75 ml of water
27.
(b)
reducing agent
28.
(a)
Kalpakkam
29.
(c)
fatty acid
30.
(c)
0.02752 m
31.
(c)
22.4 liters
32.
(c)
electrical energy
33.
(d)
34.
(d)
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
