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Published on: 12/05/2020
10th Standard Science English Medium Book back Important 1 Marks Questions
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.
Which of the following statement is wrong with respect to wind energy
wind energy is a renewable energy
the blades of wind mill are operated with the help of electric motor
production of wind energy is pollution free
usage of wind energy can reduce the consumption of fossil fuels.
2.
Common energy source in village is
electricity
coal
biogas
wood and animal dung
3.
Soil erosion is more where there is
no rainfall
low rainfall
rainfall is high
none of these
4.
Which is used to edit programs?
Inkscape
script editor
stage
sprite
5.
Which is used to build scripts?
Script area
Block palette
stage
sprite
6.
All files are stored in the _____________
Folder
box
Pai
scanner
7.
The number of chromosomes found in human beings are __________________.
22 pairs of autosomes and 1 pair of allosomes.
22 autosomes and 1 allosome
46 autosomes
46 pairs autosomes and 1 pair of allosomes.
8.
The _____________ units form the backbone of the DNA.
5 Carbon sugar
Phosphate
Nitrogenous bases
Sugar phosphate
9.
9 : 3 : 3 : 1 ratio is due to
Segregation
Crossing over
Independent assortment
Recessiveness
10.
To increase the sugar production in sugarcanes they are sprayed with _______
Auxin
Cytokinin
Gibberellins
Ethylene
11.
Avena coleoptile test was conducted by
Darwin
N. Smit
Paal
F.W. Went
12.
The hormone which has positive effect on apical dominance is:
Cytokinin
Auxin
Gibberellin
Ethylene
13.
In a hexaploid wheat( 2n = 6 x = 42 ) the haploid (n) and the basic(x) number of chromosomes respectively are
n = 7 and x = 21
n = 21 and x = 21
n = 7 and x = 7
n = 21 and x = 7
14.
We can cut the DNA with the help of
scissors
restriction endonucleases
knife
RNAase
15.
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)
16.
A single highly coiled tube where sperms are stored, get concentrated and mature is known as
Epididymis
Vasa efferentia
Vas deferens
Seminiferous tubules
17.
Syngamy results in the formation of____________
Zoospores
Conidia
Zygote
Chlamydospores
18.
The plant which propagates with the help of its leaves is ___________
Onion
Neem
Ginger
Bryophyllum
19.
Paleontologists deal with
Embryological evidences
Fossil evidences
Vestigial organ evidences
All the above
20.
The ‘use and disuse theory’ was proposed by __________.
Charles Darwin
Ernst Haeckel
Jean Baptiste Lamarck
Gregor Mendel
21.
Biogenetic law states that ___________
Ontogeny and phylogeny go together
Ontogeny recapitulates phylogeny
Phylogeny recapitulates ontogeny
There is no relationship between phylogeny and ontogeny
22.
Vomiting centre is located in
medulla oblongata
stomach
cerebrum
hypothalamus
23.
The outer most of the three cranial meninges is
arachnoid membrane
piamater
duramater
myelin sheath
24.
Bipolar neurons are found in
retina of eye
cerebral cortex
embryo
respiratory epithelium
25.
Where does alcohol effect immediately after drinking?
eyes
auditory region
liver
central nervous system
26.
Cancer of the epithelial cells is called
Leukemia
Sarcoma
Carcinoma
Lipoma
27.
Excessive consumption of alcohol leads to
Loss of memory
Cirrhosis of liver
State of hallucination
Suppression of brain function
28.
‘Heart of Heart’ is called
SA node
AV node
Purkinje fibres
Bundle of His
29.
During transpiration there is loss of
Carbon dioxide
Oxygen
Water
None of the above
30.
Active transport involves
Movement of molecules from lower to higher concentrations
Expenditure of energy
It is an uphill task
All of the above
31.
The animals which give birth to young ones are
Oviparous
Viviparous
Ovoviviparous
All the above
32.
The body of leech has
23 segments
33 segments
38 segments
30 segments
33.
The segments of leech are known as
Metameres (somites)
Proglottids
Strobila
All the above
34.
35.
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)
36.
H2(g) + Cl29(g) → 2HCl(g) is a
Decomposition Reaction
Combination Reaction
Single Displacement Reaction
Double Displacement Reaction
37.
Which of the following is hygroscopic in nature?
ferric chloride
copper sulphate pentahydrate
silica gel
none of the above
38.
Which of the following is the universal solvent?
Acetone
Benzene
Water
Alcohol
39.
A solution is a __________ mixture.
homogeneous
heterogeneous
homogeneous and heterogeneous
non homogeneous
40.
The process of coating the surface of metal with a thin layer of zinc is called______.
painting
thinning
galvanization
electroplating
41.
_____ is a relative periodic property.
atomic radii
ionic radii
electron affinity
electronegativity
42.
The basis of modern periodic law is__________.
atomic number
atomic mass
isotopic mass
number of neutrons
43.
Kreb’s cycle takes place in
chloroplast
mitochondrial matrix
stomata
inner mitochondrial membrane
44.
Which is formed during anaerobic respiration
Carbohydrate
Ethyl alcohol
Acetyl CoA
Pyruvate
45.
The endarch condition is the characteristic feature of
root
stem
leaves
flower
46.
Kamini reactor is located at __________
Kalpakkam
Koodankulam
Mumbai
Rajasthan
47.
Gamma radiations are dangerous because
it affects eyes & bones
it affects tissues
it produces genetic disorder
it produces enormous amount of heat
48.
Man-made radioactivity is also known as ___________.
Induced radioactivity
Spontaneous radioactivity
Artificial radioactivity
a & c
49.
Rectified spirit is an aqueous solution which contains about _______ of ethanol
95.5 %
75.5 %
55.5 %
45.5 %
50.
C2H5OH + 3O2 → 2CO2 + 3H2O is a
Reduction of ethanol
Combustion of ethanol
Oxidation of ethanoic acid
Oxidation of ethanal
51.
The secondary suffix used in IUPAC nomenclature of an aldehyde is ____
- ol
– oic acid
– al
- one
52.
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
53.
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
54.
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
55.
1 mole of any substance contains __________ molecules
6.023 × 1023
6.023 × 10-23
3.0115 × 1023
12.046 × 1023
56.
The gram molecular mass of oxygen molecule is
16 g
18 g
32 g
17 g
57.
In the nucleus of 20Ca40, there are
20 protons and 40 neutrons
20 protons and 20 neutrons
20 protons and 40 electrons
40 protons and 20 electrons
58.
Kilowatt hour is the unit of
resistivity
conductivity
electrical energy
electrical power
59.
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.
60.
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.
61.
Temperature is the average ______ of the molecules of a substance
difference in K.E and P.E
sum of P.E and K.E
difference in T.E and P.E
difference in K.E and T.E
62.
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)
63.
The value of universal gas constant
3.81 J mol–1 K–1
8.03 J mol–1 K–1
1.38 J mol–1 K–1
8.31 J mol–1 K–1
64.
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
A convex lens of focal length 5 cm
A concave lens of focal length 5 cm
A convex lens of focal length 10 cm
A concave lens of focal length 10 cm
65.
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
a convergent beam of light
a divergent beam of light
a parallel beam of light
a coloured beam of light
66.
The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
A
B
C
D
67.
To project the rockets which of the following principle(s) is /(are) required?
Newton’s third law of motion
Newton’s law of gravitation
law of conservation of linear momentum
both a and c
68.
69.
70.
The anterior end of leech has a lobe-like structure called _____________.
71.
The posterior sucker is formed by the fusion of the ___________ segments
72.
The number of products formed in a synthesis reaction is _________
73.
Electrolysis is type of _______________ reaction
74.
Physical expression of a gene is called _________.
75.
The pairs of contrasting character (traits) of Mendel are called_________.
76.
The hormone which has negative effect on apical dominance is _________.
77.
Gibberellins induce stem elongation in ______ plants.
78.
______________ is the most commonly used fuel for the production of electricity.
79.
Removal of soil particles from the land is called ______________.
80.
In gene cloning the DNA of interest is integrated in a __________.
81.
__________ cells are undifferentiated mass of cells.
82.
The implantation of the embryo occurs at about ___________ day of fertilization
83.
Planaria reproduces asexually by ___________
84.
_________ maintains the constant pressure inside the cranium.
85.
The forelimbs of bat and human are examples of ______________ organs.
86.
The degenerated and non-functional organs found in an organism are called ______________.
87.
The two antagonistic component of autonomic nervous system are ______ and __________.
88.
Insulin resistance is a condition in ______________diabetes mellitus.
89.
A highly poisonous chemicals derived from tobacco is _____________
90.
Water enters into the root hair cell through __________ membrane.
91.
__________ involves evaporative loss of water from aerial parts.
92.
Volume percentage decreases with increases in temperature because _____.
93.
Solubility is the amount of solute dissolved in _____ g of solvent.
94.
________ and ________ are called inner transition elements
95.
The scientist who propounded the modern periodic law is ________.
96.
The source of O2 liberated in photosynthesis is __________
97.
Glycolysis takes place in ________.
98.
If the radiation exposure is 100 R, it may cause ______________.
99.
The average energy released in each fusion reaction is about ________ J.
100.
The alkaline hydrolysis of fatty acids is termed as _____________
101.
(Saturated / Unsaturated) ___________ compounds decolourize bromine water.
102.
A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is ___________.
103.
A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms–1. The frequency heard by the observer is (speed of sound = 330 ms–1) ______.
104.
Relative atomic mass is otherwise known as __________
105.
Atoms of different elements having _______ mass number, but ________ atomic numbers are called isobars.
106.
The ratio of the potential difference to the current is known as ________.
107.
When a circuit is open, _____________ cannot pass through it.
108.
According to Boyle’s law, the shape of the graph between pressure and reciprocal of volume is ______.
109.
The value of Avogadro number ________
110.
Amount of light entering into the eye is controlled by________
111.
The path of the light is called as_____________
112.
___________ is used to change the speed of car.
113.
Passengers lean forward when sudden brake is applied in a moving vehicle. This can be explained by ___________
114.
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
115.
NH4OH(aq) + CH3COOH(aq) → CH3COONH4(aq) + H2O(l)
116.
Growth hormone
117.
Thyroxine
118.
Cerebellum
119.
Hypothalamus
120.
CFL bulbs
121.
Natural gas
122.
Diploid condition
123.
Autosomes
124.
Costume editor
125.
Script Area
126.
Bt toxin
127.
IR 8
128.
Ovulation
129.
Gestation
130.
W.F. Libby
131.
Atavism
132.
Myocardial Infarction
133.
Polydipsia
134.
O blood group
135.
Leucopenia
136.
Deliquescence
137.
Blue vitriol
138.
Dental filling
139.
Redox reaction
140.
Phloem
141.
Amphivasal
142.
Fuel
143.
BARC
144.
electrical power
145.
electric current
146.
Heat transformation
147.
Cubical expansion
148.
Law of conservation of Linear momentum
149.
Newton’s I law
150.
Soap
151.
Functional group –OH
152.
Ultrasonic
153.
Echo
154.
112 g of N2
155.
4 g of H2
156.
Hypermetropia
157.
Retina
1.
(b)
the blades of wind mill are operated with the help of electric motor
2.
(d)
wood and animal dung
3.
(c)
rainfall is high
4.
(b)
script editor
5.
(a)
Script area
6.
(a)
Folder
7.
(a)
22 pairs of autosomes and 1 pair of allosomes.
8.
(d)
Sugar phosphate
9.
(c)
Independent assortment
10.
(c)
Gibberellins
11.
(d)
F.W. Went
12.
(b)
Auxin
13.
(d)
n = 21 and x = 7
14.
(b)
restriction endonucleases
15.
(d)
both (a) and (b)
16.
(a)
Epididymis
17.
(c)
Zygote
18.
(d)
Bryophyllum
19.
(b)
Fossil evidences
20.
(c)
Jean Baptiste Lamarck
21.
(b)
Ontogeny recapitulates phylogeny
22.
(a)
medulla oblongata
23.
(c)
duramater
24.
(a)
retina of eye
25.
(d)
central nervous system
26.
(c)
Carcinoma
27.
(b)
Cirrhosis of liver
28.
(a)
SA node
29.
(c)
Water
30.
(d)
All of the above
31.
(b)
Viviparous
32.
(b)
33 segments
33.
(a)
Metameres (somites)
34.
(c)
35.
(c)
2CO(g) + O2(g) → 2CO2(g)
36.
(b)
Combination Reaction
37.
(c)
silica gel
38.
(c)
Water
39.
(a)
homogeneous
40.
(c)
galvanization
41.
(d)
electronegativity
42.
(a)
atomic number
43.
(b)
mitochondrial matrix
44.
(b)
Ethyl alcohol
45.
(b)
stem
46.
(a)
Kalpakkam
47.
(c)
it produces genetic disorder
48.
(d)
a & c
49.
(a)
95.5 %
50.
(b)
Combustion of ethanol
51.
(c)
– al
52.
(c)
25 m
53.
(c)
330 x \(\sqrt { 2 } \) ms-1
54.
(a)
330 ms-1
55.
(a)
6.023 × 1023
56.
(c)
32 g
57.
(b)
20 protons and 20 neutrons
58.
(c)
electrical energy
59.
(b)
Closing the switch completes the circuit.
60.
(b)
Rate of change of charge is current.
61.
(c)
difference in T.E and P.E
62.
(d)
(a) or (b)
63.
(d)
8.31 J mol–1 K–1
64.
(a)
A convex lens of focal length 5 cm
65.
(c)
a parallel beam of light
66.
(a)
A
67.
(d)
both a and c
68.
(d)
69.
(d)
70.
( )
anterior sucker (or) oral sucker
71.
( )
seven
72.
( )
one
73.
( )
decomposition
74.
( )
Phenotype
75.
( )
Alleles
76.
( )
cytokinins
77.
( )
Rice
78.
( )
Coal
79.
( )
soil erosion
80.
( )
Suitable vector (Plasmid)
81.
( )
Stem
82.
( )
6 to 7th
83.
( )
Regeneration
84.
( )
cerebrospinal fluid
85.
( )
homologous
86.
( )
vestigial organs
87.
( )
sympathetic and parasympathetic systems
88.
( )
Type -2 non-insulin dependent
89.
( )
Nicotin
90.
( )
Semi-permeable
91.
( )
Transpiration
92.
( )
of expansion of liquids
93.
( )
100
94.
( )
Lanthanides, Actinides
95.
( )
Hendry Moseley
96.
( )
water(H2O)
97.
( )
cytoplasm
98.
( )
Leukemia
99.
( )
3.84 x 10-12 J
100.
( )
Saponification
101.
( )
Unsaturated
102.
( )
2067 Hz
103.
( )
500 Hz
104.
( )
standard atomic weight
105.
( )
same, different
106.
( )
resistance
107.
( )
current
108.
( )
straight line
109.
( )
6.023 x 1023 / mol
110.
( )
Iris
111.
( )
ray of light
112.
( )
Acceleration
113.
( )
inertia of motion
114.
Single Displacement
115.
Neutralization
116.
Acromegaly
117.
Simple goitre
118.
Hindbrain
119.
Forebrain
120.
energy saving
121.
non - renewable energy
122.
2n
123.
22 pairs of chromosome
124.
Edit programs
125.
Build scripts
126.
Bacillus thuringienesis
127.
Semi-dwarf Rice
128.
Release of egg from Graafian follicle
129.
Duration between pregnancy and birth
130.
Radiocarbon dating
131.
Rudimentary tail and thick hair on the body
132.
Lack of blood flow to heart muscle
133.
Excessive thirst
134.
Absence of antigen
135.
Decrease in leucocytes
136.
NaOH
137.
CuSO4.5H2O
138.
silver-tin amalgam
139.
Aluminothermic process
140.
Translocation of food
141.
Dracaena
142.
uranium
143.
Mumbai
144.
watt
145.
ampere
146.
hot body to cold body
147.
change in volume
148.
propulsion of a rocket
149.
stable equilibrium of a body
150.
Potassium stearate
151.
Alcohol
152.
22 kHz
153.
Ultrasonography
154.
4 moles
155.
2 moles
156.
near point moves away
157.
Screen of the eye
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Tamilnadu Stateboard Standards
