विज्ञान (भाग-IV)

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Question 1 / 60
If the amplitude of loudness of sound becomes twice, then loudness increases by a factor of:
A
2
B
4
C
8
D
16
The range of gravitational force is:
A
10-14 m
B
Infinite
C
10-15 m
D
1 m
Bioluminescence occurs in:
A
Coelenterata and Ctenophora
B
Ctenophora and Porifera
C
Porifera and Coelenterata
D
All options are right
A force F = 2i + 3j + 6k Newton acts on a 5 kg object for 10 second, then the change in velocity of object will be:
A
12 m/s
B
14 m/s
C
24 m/s
D
36 m/s
Lichens are very good pollution indicators. They are made up of:
A
Prions and Algae
B
Fungi and Prions
C
Phycobiont and Mycobiont
D
Prions and Euglenoids
Which of the following is not appropriate to understand science at upper primary stage?
A
Observing things and recordings
B
Plotting graphs
C
Hands on experience
D
Learn the subject through abstraction
Gibbons, proboscis monkeys and Rhinoceros found in which of the following subregion of oriental Zoogeographical region?
A
Indian subregion
B
Ceylonian subregion
C
Indo-China subregion
D
Indo-Malayan subregion
The chief producers in oceans are:
A
Dinoflagellates
B
Diatoms
C
Euglenoids
D
Planktons
In following which is element of physical science lesson?
A
Title of lesson
B
Introduction
C
Presentation
D
All options are right
Which of the following represents the correct number of moles of each element in 40 g of Ferric sulphate? [Atomic mass Fe = 56 u, S = 32 u, O = 16 u]
A
Fe 2, S 3, O 12
B
Fe 1, S 1, O 4
C
Fe 0.2, S 0.3, O 1.2
D
Fe 0.1, S 0.1, O 0.4
The wall of alimentary canal possess four layer's. Which of the following is the correct sequence from outside to inside?
A
Mucosa → Muscularis → Submucosa → Serosa
B
Serosa → Muscularis → Submucosa → Mucosa
C
Submucosa → Mucosa → Muscularis → Serosa
D
Mucosa → Submucosa → Muscularis → Serosa
A light is refracted through a prism. The angle of deviation is:
A
The angle between incident ray and emergent ray
B
The angle between incident ray and refracted ray
C
The angle between refracted ray and emergent ray
D
The angle of prism
In which of the following is developing stage of process of action research?
A
Developing an action plan
B
Implementation plan and collecting data
C
Identified and limiting the topic
D
Sharing and communicating the results
Match the Column-I with Column-II: Column-I: (a) Photochemical decomposition, (b) Thermal decomposition, (c) Electrolysis, (d) Displacement reaction; Column-II: (i) 2KClO3(s) → 2KCl(s) + 3O2(g), (ii) 2Al2O3(m) → 4Al(s) + 3O2(g), (iii) Mg(s) + CuSO4(aq) → MgSO4(aq) + Cu(s), (iv) 2AgBr(s) → 2Ag(s) + Br2(g)
A
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
B
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
C
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
D
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
If an object is moving with constant acceleration along one direction only, then the distance travelled in the nth second is: [Take U = Initial Velocity, a = Acceleration]
A
U + a (1 + n²)
B
U + (a/2)(2n - 1)
C
U + (a/2)(2n + 1)
D
U + (a/2)(2n + 1)²
When an electron is passing through magnetic field, then:
A
Its velocity is increased
B
Its energy is increased
C
Both velocity and energy are increased
D
Velocity and energy of electron remain constant
Study the given Venn diagram carefully. Which of the following colloidal systems correctly represent points A, B and C?
A
A: Mist, B: Whipped cream, C: Dust fumes
B
A: Milk, B: Hair cream, C: Pumice stone
C
A: Paints, B: Smoke, C: Cloud
D
A: Coloured glasses, B: Wings of butterflies, C: Butter
The minimum distance of distinct vision for young adult with normal vision is about:
A
2.5 m
B
25 cm
C
2.5 cm
D
25 m
The distance (s) travelled by a particle varies with time (t) as: s = 1.2 t² meter. The average speed during time interval 0 to 10 second is:
A
6 m/s
B
24 m/s
C
36 m/s
D
12 m/s
Which one of the following is co-curricular activity in science teaching?
A
Science club
B
Audio-visual aids
C
Text-book
D
Blackboard
Match the Column-I with Column-II: Column-I: (a) 28 g He, (b) 0.5 mole of O₂, (c) Molecular mass of common salt, (d) 1.5 mole of calcium; Column-II: (i) 58.5 u, (ii) 7 mole, (iii) 60 g, (iv) 16 g
A
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
B
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
C
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
D
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
206 g of molten sodium bromide is electrolysed. The maximum mass of sodium obtained will be: [Atomic mass Na = 23 u, Br = 80 u]
A
40 g
B
46 g
C
52 g
D
23 g
In the entire process of glycolysis, 4 phosphorylation occurs in two of the following steps: I. 1-3 Diphosphoglyceric acid → 3-phosphoglyceric acid, II. Phosphoenol Pyruvic acid → Pyruvic acid, III. 2-phosphoglyceric acid → phosphoenol pyruvic acid, IV. 3-phosphoglyceric acid → 2-phosphoglyceric acid
A
Only I and II
B
Only II and III
C
Only III and IV
D
Only I and IV
Match the mixture given in Column-I with their method of separation given in Column-II: Column-I: (a) Oil mixed with water, (b) Iron powder mixed with flour, (c) Salt mixed with water, (d) Kidney beans mixed with rice flour; Column-II: (i) Sieving, (ii) Decantation, (iii) Magnet, (iv) Evaporation
A
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
B
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
C
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
D
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
A bulb of 210 W will produce heat in calorie within 5 minutes? [Take 4.2 J = 1 cal.]
A
63,000 cal
B
80,000 cal
C
15,000 cal
D
10,500 cal
The scientist who first explained that cells divide and new cells are formed from pre existing cells is:
A
Walther Flemming
B
Rudolf Virchow
C
Robert Hooke
D
Schleiden and Schwann
Which of the following are exothermic processes? (i) Reaction of water with quick lime, (ii) Dilution of an acid, (iii) Evaporation of water, (iv) Sublimation of camphor (crystals)
A
(i) and (ii)
B
(ii) and (iii)
C
(i) and (iv)
D
(ii) and (iv)
Which is correct option in following?
A
Sliding friction > Rolling friction > Static friction
B
Rolling friction > Sliding friction > Static friction
C
Rolling friction > Static friction > Sliding friction
D
Static friction > Sliding friction > Rolling friction
The chemical formula of cryolite is:
A
Al₂O₃·2H₂O
B
Na₃AlF₆
C
Na₂AlF₆
D
NaAlF₃
Which one of these phylum possess closed circulatory system?
A
Annelida
B
Arthropoda
C
Mollusca
D
Echinodermata
A porter lifts a luggage of 15 kg from ground and puts it on his head 2.0 m above the ground. The work done by porter on the luggage is: [Take g = 10 m/s²]
A
300 Nm
B
30 Nm
C
600 Nm
D
3 Nm
Which of the following set of fishes are edible?
A
Catla, Rohu, Hilsa and Pomfret
B
Prawn, Sardines, Lobsters and Rohu
C
Prawn, Lobsters, Crab and Oysters
D
Rohu, Mackerel, Lobsters and Crab
What are the primary lymphoid organs in the body?
A
Spleen and lymph nodes
B
Tonsils and payer's patches
C
Bone marrow and thymus
D
Thymus and appendix
Which of the following statement is not true?
A
When a candle burns, both physical and chemical changes take place.
B
Anaerobic bacteria digest animal waste and produce biogas.
C
Depositing a layer of iron on zinc is called galvanization.
D
Stretching of rubber band is a physical change.
When glomerular filtration rate falls which of the following hormone is released to stimulate glomerular blood flow?
A
ADH (Antidiuretic hormone)
B
Renin
C
Angiotensin
D
Aldosterone
Which of the following species is critically endangered reptile in India?
A
Gharial
B
Bengal Monitor
C
Common Skink
D
Green Turtle
A convex mirror has a radius of curvature of 3.0 m. If a object is located at 5 m from the mirror, then position of image is:
A
+2.14 m
B
-1.15 m
C
-2.14 m
D
+1.15 m
The kinetic energy of an object of mass m moving with velocity 5 m/s is 25 J. If velocity of this object increased by three times, then kinetic energy will be:
A
225 J
B
75 J
C
450 J
D
375 J
Which one of these is a excitatory neurotransmitter?
A
Glycine
B
Dopamine
C
Acetylcholine
D
GABA (Gamma Aminobutyric Acid)
Which of the following is the correct sequence of succession in plants?
A
Xerarch → Hydrarch → Mesic
B
Xerarch → Mesic → Hydrarch
C
Mesic → Xerarch → Hydrarch
D
Hydrarch → Mesic → Xerarch
In which the following mirror is used as rear view in vehicle?
A
Convex mirror
B
Concave mirror
C
Both convex and concave mirror together
D
None of these
The hydrophilic end of a synthetic detergent is:
A
CH₃ – (CH₂)₁₀ – CH₂ –
B
CO₃⁻ Na⁺
C
SO₃⁻ Na⁺
D
COO⁻ Na⁺
One of the following is hormone secreted from Heart:
A
Atrial Natriuretic Factor
B
Noradrenaline
C
Vasopressin
D
Adrenaline
How many facial bones are there in the skull of human?
A
8
B
14
C
22
D
2
The apparatus given below is used to study the diffusion of a number of gases at the same temperature and pressure. Which of the following pairs of gases would diffuse into vacuum at the same speed? (Given atomic mass of H = 1 u, C = 12 u, N = 14 u, O = 16 u)
A
NH₃ and H₂
B
CO and SO₂
C
CO and N₂
D
NH₃ and N₂
Which of the following is the correct arrangement of the given metals in descending order of their reactivity? Zinc, Iron, Magnesium, Sodium
A
Zinc > Iron > Magnesium > Sodium
B
Sodium > Magnesium > Iron > Zinc
C
Sodium > Zinc > Magnesium > Iron
D
Sodium > Magnesium > Zinc > Iron
The process of release of sperm from seminiferous tubule is known as:
A
Ejaculation
B
Spermatogenesis
C
Spermiogenesis
D
Spermiation
Which of the following statement is correct with respect to flame?
A
Outer zone of the flame is its hottest part where complete combustion takes place.
B
Middle zone of the flame is of red coloured.
C
Innermost zone of the flame is moderately hot.
D
Innermost zone of the flame is of blue coloured.
At a height h above the earth's surface the fractional change in the value of acceleration due to gravity is: [Given R - Radius of earth]
A
h/R
B
1 - 2h/R
C
2h/R
D
1 + 2h/R
In which of the following media speed of sound wave is greater?
A
Air
B
Glass (Flint)
C
Water
D
Vacuum
A block of mass 5 kg is kept on a tabletop. If block have length 10 cm, breadth 20 cm and height 40 cm, then pressure exerted by block of mass 5 kg on the tabletop is: [Take g = 9.8 m/s²]
A
612.5 N/m²
B
2450 N/m²
C
1225 N/m²
D
6125 N/m²
Which of the following statement is true?
A
Southern blotting technique is developed by Alvine et.al. (1979).
B
Northern blotting technique is developed by Broome and Gilbert (1978).
C
Western blotting technique is developed by Towbin et.al. (1979).
D
E. M. Southern (1975) purified IgG.
Light enters from air to glass having refractive index 1.50. If the speed of light in vacuum is 3 × 10⁸ m/s, then speed of light in the glass is:
A
0.5 × 10⁸ m/s
B
1 × 10⁸ m/s
C
3 × 10⁸ m/s
D
1.5 × 10⁸ m/s
Which of the following is an acid-base indicator?
A
Vinegar
B
Lime water
C
Turmeric
D
Baking soda
Which of the following statement best describes the nature of science?
A
Scientists are totally objective in their work.
B
The scientific method is the only guide for conducting research.
C
Science is a system of beliefs.
D
Science is social in nature.
The offsprings produced after asexual reproduction are:
A
Only morphologically same
B
Only genetically same
C
Morphologically and genetically same
D
Morphologically and genetically different
Which of these is used in extraction of metals?
A
Coke
B
Coal gas
C
Coaltar
D
Petroleum
Which of the following statements are correct? I. Housefly have sponging type of mouthparts. II. Honey-bee have biting and chewing type of mouthparts. III. Butterflies have siphoning type of mouthparts. IV. Cockroaches have chewing and lapping type of mouthparts.
A
Only II and III
B
Only I and III
C
Only I and II
D
Only II and IV
A brown coal, low in carbon content (60-70%), high in moisture content and generally used in power plants to produce electricity is:
A
Peat
B
Lignite
C
Bituminous
D
Anthracite
Which of the following statements are correct? (i) Temperature changes during the change of a state. (ii) Dry ice gets converted directly into gaseous state under normal atmospheric conditions. (iii) Higher boiling points of liquid indicates weaker intermolecular forces. (iv) Latent heat of vaporization is generally higher than the latent heat of fusion for a substance.
A
(i) and (iv)
B
(ii) and (iv)
C
(ii) and (iii)
D
(iii) and (iv)