#### Bookback Important 1 Marks Questions

10th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 150

Part A

69 x 1 = 69
1. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg

(a)

4 M

(b)

2 M

(c)

M/4

(d)

M

2. If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

(a)

decrease by 50%

(b)

increase by 50%

(c)

decrease by 25%

(d)

increase by 300%

3. To project the rockets which of the following principle(s) is /(are) required?

(a)

Newton’s third law of motion

(b)

Newton’s law of gravitation

(c)

law of conservation of linear momentum

(d)

both a and c

4. 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)

A

(b)

B

(c)

C

(d)

D

5. A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce

(a)

a convergent beam of light

(b)

a divergent beam of light

(c)

a parallel beam of light

(d)

a coloured beam of light

6. Which of the following lens would you prefer to use while reading small letters found in a dictionary?

(a)

A convex lens of focal length 5 cm

(b)

A concave lens of focal length 5 cm

(c)

A convex lens of focal length 10 cm

(d)

A concave lens of focal length 10 cm

7. The value of universal gas constant

(a)

3.81 mol–1 K–1

(b)

8.03 mol–1 K–1

(c)

1.38 mol–1 K–1

(d)

8.31 mol–1 K–1

8. If a substance is heated or cooled, the linear expansion occurs along the axis of

(a)

X or –X

(b)

Y or –Y

(c)

both (a) and (b)

(d)

(a) or (b)

9. Temperature is the average ______ of the molecules of a substance

(a)

difference in K.E and P.E

(b)

sum of P.E and K.E

(c)

difference in T.E and P.E

(d)

difference in K.E and T.E

10. Which of the following is correct?

(a)

Rate of change of charge is electrical power

(b)

Rate of change of charge is current.

(c)

Rate of change of energy is current.

(d)

Rate of change of current is charge.

11. In a simple circuit, why does the bulb glow when you close the switch?

(a)

The switch produces electricity

(b)

Closing the switch completes the circuit.

(c)

Closing the switch breaks the circuit.

(d)

The bulb is getting charged.

12. Kilowatt hour is the unit of

(a)

resistivity

(b)

conductivity

(c)

electrical energy

(d)

electrical power

13. Velocity of sound in a gaseous medium is 330 m s-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

(a)

330 m s-1

(b)

660 m s-1

(c)

165 ms-1

(d)

990 ms-1

14. The velocity of sound in air at a particular temperature is 330 m s-1. What will be its value when temperature is doubled and the pressure is halved?

(a)

330 m s-1

(b)

165 m s-1

(c)

330 x $\sqrt { 2 }$ m s-1

(d)

320/$\sqrt { 2 }$ ms-1

15. Velocity of sound in the atmosphere of a planet is 500 m s-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

(a)

17 m

(b)

20 m

(c)

25 m

(d)

50 m

(a)

(b)

(c)

(d)

a & c

17. Gamma radiations are dangerous because

(a)

it affects eyes & bones

(b)

it affects tissues

(c)

it produces genetic disorder

(d)

it produces enormous amount of heat

18. Kamini reactor is located at __________

(a)

Kalpakkam

(b)

Koodankulam

(c)

Mumbai

(d)

Rajasthan

19. In the nucleus of 20Ca40, there are

(a)

20 protons and 40 neutrons

(b)

20 protons and 20 neutrons

(c)

20 protons and 40 electrons

(d)

40 protons and 20 electrons

20. The gram molecular mass of oxygen molecule is

(a)

16 g

(b)

18 g

(c)

32 g

(d)

17 g

21. 1 mole of any substance contains __________ molecules

(a)

6.023 × 1023

(b)

6.023 × 1023

(c)

3.0115 × 1023

(d)

12.046 × 1023

22. The basis of modern periodic law is__________

(a)

atomic number

(b)

atomic mass

(c)

isotopic mass

(d)

number of neutrons

23. _____ is a relative periodic property

(a)

(b)

(c)

electron affinity

(d)

electronegativity

24. The process of coating the surface of metal with a thin layer of zinc is called______.

(a)

painting

(b)

thinning

(c)

galvanization

(d)

electroplating

25. A solution is a __________ mixture.

(a)

homogeneous

(b)

heterogeneous

(c)

homogeneous and heterogeneous

(d)

non homogeneous

26. Which of the following is the universal solvent?

(a)

Acetone

(b)

Benzene

(c)

Water

(d)

Alcohol

27. Which of the following is hygroscopic in nature?

(a)

ferric chloride

(b)

copper sulphate penta hydrate

(c)

silica gel

(d)

none of the above

28. H2(g) + Cl29(g) → 2HCl(g) is a

(a)

Decomposition Reaction

(b)

Combination Reaction

(c)

Single Displacement Reaction

(d)

Double Displacement Reaction

29. Which of the following is not an“element + element → compound” type reaction?

(a)

C(s) + O2(g) → CO2(g)

(b)

2K(s) + Br2(l) → 2KBr(s)

(c)

2CO(g) + O2(g) → 2CO2(g)

(d)

4Fe(s) + 3O2(g) → 2Fe2O3(s)

30. The pH of a solution is 3. Its [OH–] concentration is

(a)

1 × 10–3 M

(b)

3M

(c)

1 × 10–11 M

(d)

11 M

31. The secondary suffix used in IUPAC nomenclature of an aldehyde is ____

(a)

- ol

(b)

– oic acid

(c)

– al

(d)

- one

32. C2H5OH + 3O2 → 2CO2 + 3H2O is a

(a)

Reduction of ethanol

(b)

Combustion of ethanol

(c)

Oxidation of ethanoic acid

(d)

Oxidation of ethanal

33. Rectified spirit is an aqueous solution which contains about _______ of ethanol

(a)

95.5 %

(b)

75.5 %

(c)

55.5 %

(d)

45.5 %

34. The endarch condition is the characteristic feature of

(a)

root

(b)

stem

(c)

leaves

(d)

flower

35. Which is formed during anaerobic respiration

(a)

Carbohydrate

(b)

Ethyl alcohol

(c)

Acetyl CoA

(d)

Pyruvate

36. Kreb’s cycle takes place in

(a)

chloroplast

(b)

mitochondrial matrix

(c)

stomata

(d)

inner mitochondrial membrane

37. The segments of leech are known as _____________.

(a)

Metameres (somites)

(b)

Proglottids

(c)

Strobila

(d)

All the above

38. The body of leech has

(a)

23 segments

(b)

23 segments

(c)

38 segments

(d)

30 segments

39. The animals which give birth to young ones are

(a)

Oviparous

(b)

Viviparous

(c)

Ovoviviparous

(d)

All the above

40. Active transport involves

(a)

movement of molecules from lower to higher concentration

(b)

expenditure of energy

(c)

(d)

all of the above

41. During transpiration there is loss of

(a)

carbon dioxide

(b)

oxygen

(c)

water

(d)

none of the above

42. ‘Heart of heart’ is called

(a)

SA node

(b)

AV node

(c)

Purkinje fibres

(d)

Bundle of His

43. Bipolar neurons are found in

(a)

retina of eye

(b)

cerebral cortex

(c)

embryo

(d)

respiratory epithelium

44. The outer most of the three cranial meninges is

(a)

arachnoid membrane

(b)

piamater

(c)

duramater

(d)

myelin sheath

45. Vomiting centre is located in

(a)

medulla oblongata

(b)

stomach

(c)

cerebrum

(d)

hypothalamus

46. The hormone which has positive effect on apical dominance is:

(a)

Cytokinin

(b)

Auxin

(c)

Gibberellin

(d)

Ethylene

47. Avena coleoptile test was conducted by

(a)

Darwin

(b)

N. Smit

(c)

Paal

(d)

F.W. Went

48. To increase the sugar production in sugarcanes they are sprayed with _______

(a)

Auxin

(b)

Cytokinin

(c)

Gibberellins

(d)

Ethylene

49. The plant which propagates with the help of its leaves is ___________

(a)

Onion

(b)

Neem

(c)

Ginger

(d)

Bryophyllum

50. Syngamy results in the formation of____________

(a)

Zoospores

(b)

Conidia

(c)

Conidia

(d)

Chlamydospores

51. A single highly coiled tube where sperms are stored, get concentrated and mature is known as

(a)

Epididymis

(b)

Vasa efferentia

(c)

Vas deferens

(d)

Seminiferous tubules

52. 9 : 3 : 3 : 1 ratio is due to

(a)

Segregation

(b)

Crossing over

(c)

Independent assortment

(d)

Recessiveness

53. The _____________ units form the backbone of the DNA.

(a)

5 carbon sugar

(b)

Phosphate

(c)

Nitrogenous bases

(d)

Sugar phosphate

54. The number of chromosomes found in human beings are __________________.

(a)

22 pairs of autosomes and 1 pair of allosomes

(b)

22 autosomes and 1 allosome

(c)

46 autosomes

(d)

46 pairs autosomes and 1 pair of allosomes.

55. Biogenetic law states that ___________

(a)

Ontogeny and phylogeny go together

(b)

Ontogeny recapitulates phylogeny

(c)

Phylogeny recapitulates ontogeny

(d)

There is no relationship between phylogeny and ontogeny

56. The ‘use and disuse theory’ was proposed by __________.

(a)

Charles Darwin

(b)

Ernst Haeckel

(c)

Jean Baptiste Lamarck

(d)

Gregor Mendel

57. Paleontologists deal with

(a)

Embryological evidences

(b)

Fossil evidences

(c)

Vestigial organ evidences

(d)

All the above

58. Which of the following is used to produce products useful to humans by biotechnology techniques?

(a)

enzyme from organism

(b)

live organism

(c)

vitamins

(d)

both (a) and (b)

59. We can cut the DNA with the help of

(a)

scissors

(b)

restriction endonucleases

(c)

knife

(d)

RNAase

60. In a hexaploid wheat( 2n = 6 x = 42 ) the haploid (n) and the basic(x) number of chromosomes are

(a)

n = 7 and x = 21

(b)

n = 21 and x = 21

(c)

n = 7 and x = 7

(d)

n = 21 and x = 7

61. Excessive consumption of alcohol leads to

(a)

Loss of memory

(b)

Cirrhosis of liver

(c)

State of hallucination

(d)

Supression of brain

62. Cancer of the epithelial cells is called

(a)

Leukemia

(b)

Sarcoma

(c)

Carcinoma

(d)

Lipoma

63. Where does alcohol effect immediately after drinking?

(a)

eyes

(b)

auditory region

(c)

liver

(d)

central nervous system

64. Soil erosion is more where there is

(a)

no rain fall

(b)

low rainfal

(c)

rain fall is high

(d)

none of these

65. Common energy source in village is

(a)

electricity

(b)

coal

(c)

biogas

(d)

wood and animal dung

66. Which of the following statement is wrong with respect to wind energy

(a)

wind energy is a renewable energy

(b)

the blades of wind mill are operated with the help of electric motor

(c)

production of wind energy is pollution free

(d)

usage of wind energy can reduce the consumption of fossil fuels.

67. All files are stored in the _____________

(a)

Folder

(b)

box

(c)

Pai

(d)

scanner

68. Which is used to build scripts?

(a)

Script area

(b)

Block palette

(c)

stage

(d)

sprite

69. Which is used to edit programs?

(a)

Inkscape

(b)

script editor

(c)

stage

(d)

sprite

70. Part B

44 x 1 = 44
71. Passengers lean forward when sudden brake is applied in a moving vehicle. This can be explained by ___________

()

inertia of motion

72. ___________ is used to change the speed of car.

()

Gear

73. The path of the light is called as_____________

()

ray

74. Amount of light entering into the eye is controlled by________

()

Iris

75. The value of Avogadro number ________

()

6.023 x 1023 / mol (or) mol-1]

76. According to Boyle’s law, the shape of the graph between pressure and reciprocal of volume is ______.

()

straight line

77. When a circuit is open, _____________ cannot pass through it.

()

current

78. The ratio of the potential difference to the current is known as ________.

()

resistance

79. A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 m s–1. The frequency heard by the observer is (speed of sound = 330 m s–1) ______.

()

500 Hz

80. 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 ___________.

()

2068 Hz

81. The average energy released in each fusion reaction is about ________ J.

()

3.84 x 10-12

82. If the radiation exposure is 100 R, it may cause ______________.

()

Iukemia

83. Atoms of different elements having _______ mass number, but ________ atomic numbers are called isobars.

()

same, different

84. Relative atomic mass is otherwise known as __________

()

standard atomic weight

85. The scientist who propounded the modern periodic law is ________.

()

Henry Moseley

86. ________ and ________ are called inner transition elements

()

Lanthanides, Actinides

87. Solubility is the amount of solute dissolved in _____ g of solvent.

()

100

88. Volume persentage decreases with increases in temperature because _____.

()

of expansion of liquids

89. Electrolysis is type of _______________ reaction

()

decomposition

90. The number of products formed in a synthesis reaction is _________

()

one

91. (Saturated / Unsaturated) ___________ compounds decolourize bromine water.

()

Unsaturated

92. The alkaline hydrolysis of fatty acids is termed as _____________

()

Saponification

93. Glycolysis takes place in ________.

()

cytoplasm

94. The source of O2 liberated in photosynthesis is __________

()

water

95. The posterior sucker is formed by the fusion of the ___________ segments

()

last 7

96. The anterior end of leech has a lobe-like structure called _____________.

()

anterior sucker

97. __________ involves evaporative loss of water from aerial parts.

()

Transpiration

98. Water enters the root cell through a __________ plasma membrane.

()

root hair

99. The two antagonistic component of autonomic nervous system are ______ and __________.

()

sympathetic nerves, para sympathetic nerves

100. _________ maintains the constant pressure inside the cranium.

()

cerebro spinal fluid

101. Gibberellins induce stem elongation in ______ plants.

()

rosette

102. The hormone which has negative effect on apical dominance is _________.

()

cytokinin

103. Planaria reproduces asexually by ___________

()

Regeneration

104. The implantation of the embryo occurs at about ___________ day of fertilization

()

7th

105. The pairs of contrasting character (traits) of Mendel are called_________

()

alleles

106. Physical expression of a gene is called _________

()

phenotype

107. The degenerated and non-functional organs found in an organism are called ______________.

()

vestigial organs

108. The forelimbs of bat and human are examples of ______________ organs.

()

homologous

109. __________ cells are undifferentiated mass of cells.

()

Callus

110. In gene cloning the DNA of interest is integrated in a __________.

()

vector

111. A highly poisonous chemicals derived from tobacco is _____________

()

Nicotine

112. Insulin resistance is a condition in ______________diabetes mellitus.

()

Type II

113. Removal of soil particles from the land is called ______________.

()

soil erosion

114. ______________ is the most commonly used fuel for the production of electricity.

()

Coal

115. Part C

44 x 1 = 44
116. Newton’s I law

117. (1)

Dracaena

118. Law of conservation of Linear momentum

119. (2)

stable equilibrium of an object

120. Retina

121. (3)

Forebrain

122. Hypermetropia

123. (4)

near point moves away

124. Cubical expansion

125. (5)

22 pair of chromosome

126. Heat transformation

127. (6)

Alumino thermic process

128. electric current

129. (7)

Absence of antigen

130. electrical power

131. (8)

4 moles

132. Echo

133. (9)

Semi-dwarf Rice

134. Ultrasonic

135. (10)

uranium

136. BARC

137. (11)

silver-tin amalgam

138. Fuel

139. (12)

Attachment of zygote to endometrium

140. 4 g of H2

141. (13)

2n

142. 112 g of N2

143. (14)

Single Displacement

144. Redox reaction

145. (15)

hot body to cold body

146. Dental filling

147. (16)

Acromegaly

148. Blue vitriol

149. (17)

non - renewable energy

150. Deliquescence

151. (18)

Bacillus thuringienesis

152. NH4OH(aq) + CH3COOH(aq) → CH3COONH4(aq) + H2O(l)

153. (19)

Potassium stearate

154. Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

155. (20)

Excessive thirst

156. Functional group –OH

157. (21)

Decrease in leucocytes

158. Soap

159. (22)

Ultrasonography

160. Amphivasal

161. (23)

NaOH

162. Phloem

163. (24)

propulsion of a rocket

164. Leucopenia

165. (25)

Build scripts

166. O blood group

167. (26)

change in volume

168. Hypothalamus

169. (27)

Mumbai

170. Cerebellum

171. (28)

Release of egg from Graffian follicle

172. Thyroxine

173. (29)

174. Growth hormone

175. (30)

22 kHz

176. Gestation

177. (31)

Screen of the eye

178. Ovulation

179. (32)

rudimentary tail and thick hair on the body

180. Autosomes

181. (33)

Alcohol

182. Diploid condition

183. (34)

ampere

184. Atavism

185. (35)

Simple goitre

186. W.F. Libby

187. (36)

energy saving

188. IR 8

189. (37)

Hindbrain

190. Bt toxin

191. (38)

Lack of blood flow to heart muscle

192. Polydipsia

193. (39)

2 moles

194. Myocardial Infarction

195. (40)

CuSO4.5H2O

196. Natural gas

197. (41)

Edit programs

198. CFL bulbs

199. (42)

watt

200. Script Area

201. (43)

Translocation of food

202. Costume editor

203. (44)

Neutralization