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Class 10 Science Question Answers

Question Answer

Class 10

Science

Master Class 10 Science: Engag...

Class 10 Science Question Answers

Indigo dye is an example of:A. Azo dyeB. Vat dyeC. Dispersed dyeD. Basic dye

Give reason: Liquids and gases flow but solids do not?

The following reaction is a: \\[2HgO \\to 2Hg + {O_2}\\]A.Chemical combination reactionB.Chemical displacement reactionC.Chemical decomposition reactionD.Physical change

An element X (atomic number \\[17\\] ) reacts with an element Y (atomic number\\[20\\]) to form a divalent halide.The element x is:A. a MetalB. a Non MetalC. a MetalloidD. None of these

Electrical fittings are generally made of:A. German silverB. BrassC. BronzeD. Gun metal

The density of a gas is $0.259{\\text{ g }}{{\\text{L}}^{ - 1}}$ at $400{\\text{ K}}$ and $190{\\text{ torr}}$. Find its molar mass.

Which acid is present in ant sting?(A) Butanoic acid (B) Acetic acid(C) Methanoic acid(D) Ethanoic acid

Fiber obtained by chemical treatment of wood pulp is called _______.A. natural silkB. rayonC. nylonD. polyester

Most balloons tyres and footballs are made-of rubber. This is because rubber is:A) Naturally availableB) CheapC) An electric insulatorD) Soft and flexible

A piece of zinc metal is placed in 1.0M solution of hydrochloric acid at ${{25}^{0}}C$. How would you find the net ionic equation of $HCl+Zn\\to {{H}_{2}}+ZnC{{l}_{2}}$

Tooth decay is caused by the presence of a base.a. Trueb. False

How are metalloids different from metals?

Iodine is A.Lustrous non metalB.Sonorous non metalC.Lustrous metalD.Malleable metal

What is a synthesis reaction? How are they used in the real world?

The reaction is an example of:$Zn + 2HCl \\to ZnC{l_2} + {H_2} \\uparrow $A. Combination reactionB. Double displacement reactionC. Displacement reactionD. Decomposition reaction

(a) What is the atomic number of carbon? Write its electronic configuration.(b) What type of chemical bonds are formed by carbons? Why?(c) Name the three allotropic forms of carbon.

Give an account of energy flow in the ecosystem.

Chief function of HCl isA. To maintain a low pH to promote the growth of microorganismB. To facilitate absorptionC. To maintain low pH to activate pepsinogen to form pepsinD. To dissolve enzyme secreted in the stomach

Why the study\/checking chemical and physical properties of daily used substances\/material is important?

What is meant by sustainable management? The environmentalists are insisting upon “sustainable natural resources management.” State its four advantages.

The sexual reproduction in Spirogyra isa. Oogamousb. Isogamousc. Cleistogamousd. Conjugation

The largest reservoir of nitrogen on earth is:A. SoilB. OceansC. Air D. Granite rocks

Canal system is the speciality of which phylum?A) PoriferaB) CoelenterataC) EchinodermataD) None of the above

Describe the structure of the cell organelle known as ‘Powerhouse of the cell’?

In Spirogyra asexual reproduction takes place by fragmentation. A) TrueB) False

‘Tendwa' is zoologically named as(a) Panthera tigris(b) Panthera leo(c) Panthera uncia(d) Panthera pardus

The state bird of Rajasthan isA. Pavo cristatusB. Columba liviaC. Choriotis nigricepsD. Passer domesticus.

A person met with an accident and died instantaneously without any injury to heart brain stomach or kidney which one of the following must be the reason?A) Diaphragm got puncturedB) Stomach stopped digestionC) Intestine get twistedD) RBCs got coagulated

Identify which of the following fruits are false fruits?\n \n \n \n \n (a) a b c d(b) b c d(c) a b(d) c d

What is the importance of the forest as a resource? (a) It improves the water holding capacity of the soil. (b) It provides habitat food protection to wildlife. (c) It helps in balancing the CO$_2$ and O$_2$ of the atmosphere. (d) All of the above.

First kidney transplant in India was done onA) May 1965B) February 1965C) May 1994D) May 1978

The process by which plants lose water by evaporation is called (a)Respiration(b)Photosynthesis(c)Transpiration(d)Absorption

The incorrect matched pair is(A) Cerebal aqueduct- canal that passess through midbrain(B) Corpora quadrigemina- four rounded swellings present on ventral portion of midbrain(C) Cerebrum- very convoluted surface(D) Medulla oblongata- controls gastric secretions

The cells which have CD - 8 markers on the cell membrane are(a) B-lymphocytes(b) Natural killer cells(c) T-cytotoxic cells(d) T-helper cells

A trihybrid cross is made between two plants with genotype $\\dfrac{A}{a} \\dfrac{B}{b} \\dfrac{C}{c}$ how many offsprings of such cross will have a genotype $\\dfrac{a}{a} \\dfrac{b}{b} \\dfrac{c}{c}$?A. $\\dfrac{1}{64}$B. $\\dfrac{1}{4}$C. $\\dfrac{1}{16}$D. $\\dfrac{1}{32}$

Jhoom cultivation refers to A) Cultivation of Jamun treeB) Cultivation of medicinal plants by tribesC) Tribal method of shifting cultivationD) Cultivation of terraces

Give examples of analogous organs in plants.

What do you mean by codominance? Explain it with examples of blood groups in human beings.

What are fossils? How to determine the age of a fossil?

The organism that causes elephantiasis belongs toA. InsectaB. ProtozoaC. NematodaD. Coelenterata

Oxygen liberated during photosynthesis comes fromA. WaterB. ChlorophyllC. Carbon DioxideD. Glucose

Liver gland secretesA) Pancreatic JuiceB) Bile juiceC) Gastric JuiceD) Various digestive juice

When pure long plant having a white flower is crossed with a pure dwarf plant having a red flower the dwarf progeny in F2 generation isA) 1\/16B) 3\/16C) 4\/16D) 9\/16

The human kidney: A. Concentrates the urine by actively transporting water out of the filtrate. B. Produces more dilute urine when the collecting ducts become less permeable to water. C. Responds to the anti-diuretic hormone by increasing urine output. D. Gets rid of urine from the body by secreting it into the descending arm of the loop of Henle.

The shoulder and forelimb are connected to the heart by A. Dorsal aortaB. Subclavian arteryC. Esophageal arteryD. None of the above

The sensory ganglion concerned with spinal reflex is located in A. Dorsal root of spinal nerve B. Ventral root of spinal nerve C. Both A and B. D. None of the above.

Why does the action of salivary amylase stop in the stomach?

Reclamation and little leaf is caused by deficiency of A) Zn and MoB) Cu and ZnC) Cu and BD) Mn and Cu

The name of Smt. Thimmakka is associated with the A. Planting and conservation of avenue treesB. Agitations against hydroelectric projectC. 'Appiko' movementD. Conservation of fauna and flora of the western ghats

What is the function of Copper-T?A) Stops zygote formation B) Checks mutationC) Stops Obliteration of Blastocoel D) Stops Fertilization

Loss of the water through the epidermis of aerial parts of the plant is reduced by _ _ _ _ _ .

Compare the traditional water harvesting system with a portable system in hilly\/mountain areas or plains or plateau regions.

Jacobson’s organs are connected withA) TouchB) SmellC) SightD) Hearing

Distinguish between(a)Inland fishery and marine fishery(b)Culture fishery and capture fishery(c)Aquaculture and pisciculture

Arrange the following five steps of nutrition in the correct sequence: (digestion assimilation ingestion egestion absorption).

What do you mean by superior and inferior ovaries?

Bryophyllum daigremontianum is characterized by the formation of (a)Plantlets in leaf notches while attached to the plant.(b)Plantlets from marginal notches when the leaf falls on the ground.(c)Buds in the marginal notches of leaves.(d)Plantlets on the leaves in the region of injury.

Describe the process of respiration in Amoeba. State whether it is anaerobic respiration or aerobic respiration.

Biogas mainly consists of:a. Ethaneb. $CO_2$c. $H_2$d. Methane

Pancreas hormone secrete:A) Vasopressin and Oxytocin B) Insulin and glucagonC) FSH and LHD) Epinephrine and norepinephrine

Iodine test can detectA. CarbohydratesB. Nucleic acidsC. LipidsD. Proteins

Multicostate parallel venation occurs inA) Banana and CannaB) Mango and PeepalC) Grasses and PalmsD) Castor and TapiocaE) Castor and China rose

List the steps of preparation of the temporary mount of a leaf peel to observe stomata.

Growth in the human brain from newborn to adult isa. 100gm to 1 kgb. 400gm to 1.4 kgc. 0.2 gm to 1.4 kgd. 1.4 gm to 2.4 kg

In the muscles carbohydrates are stored in the form of A) GlycolipidB) CelluloseC) StarchD) Glycogen

A parasite which becomes saprophytic in the absence of host is calledA) Obligate parasiteB) Facultative parasiteC) Obligate saprophyteD) Facultative saprophyte

The layer of cells that secrete the enamel of the tooth isA. DentoblastB. AmeloblastC. OsteoblastD. Odontoblast

What is decomposition? Explain decomposition cycle in a terrestrial ecosystem. Draw its diagrammatic representation.

Differentiate between the small intestine and large intestine.

Assertion – The quasi-fluid nature of lipid enables the lateral movement of proteins within the overall bilayer.Reason – This ability to move within the membrane is called fluidity and is important for cell growth.(a) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion(b)Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion(c) Assertion is correct but Reason is incorrect(d) Both Assertion and Reason are incorrect

Soap and detergents are the sources of organic pollutants like(a) Glycerol(b) Polyphosphates(c) Sulfonated hydrocarbon(d) All of the above

Excessive exposure of humans to UV-rays results in (This question has multiple correct options)(a)Damage to immune system(b)Damage to lungs(c)Skin cancer(d)Peptic ulcers

An organochlorine insecticide is?A. DDT\/aldrinB. MalathionC. Tetraethyl pyrophosphateD. Thiocarbamate

Lysosomes are so called as they haveA. oxidizing enzymesB. Digestive enzymes C. Respiratory enzymesD. Carboxylating enzymes

Filtration of blood takes place atA. PCTB. DCTC. Collecting ductsD. Malphigian body

Explain types of chloroplast.

The region of the nephron found in the renal medulla isA. Malpighian corpuscleB. Proximal convoluted tubuleC. Distal convoluted tubuleD. Henle’s loopE. Glomerulus

The percentage of oxygen in the air is (a)78%(b)0.03%(c)21%(d)80%

Primary sex organs differ from the secondary sex organs in all the following except.a. They produce gametesb. They secrete sex hormonesc. They are concerned with the conduction of gametesd. Testes in male and ovaries in female are the examples of primary sex organs

Receptors which are sensitive to pain areA. TangoreceptorsB. FrigidoreceptorsC. RheoreceptorsD. Algesireceptors

Distinguish between pectoral and Pelvic girdle.

Double fertilization and triple fusion were discovered by.A. HofmeisterB. Nawaschin and GuignardC. LeeuwenhoekD. Starburger

Largest salivary gland isA. sublingualB. submandibularC. ParotidD. all of the above

Seed habit is an important step in evolution. It is due to (a)Heterogamy (b)Heterospory(c)Homospory(d)Homogamy

Asia's largest wind farm using wind waves for generating power is at(a)Kyota (Japan) (b)Lamba (Gujrat) (c) Kazakistan(d)Pokhran (India)

Oil spills reduce _____________ supplies within the water environment.A) Carbon dioxideB) OxygenC) NitrogenD) None of these

ATP formation during photosynthesis is known asA) PhosphorylationB) Photophosphorylation.C) Oxidative phosphorylation.D) Substrate-level phosphorylation

An endogenous chemical agent of disease isA) Uric acidB) Protein deficiencyC) Vitamin deficiencyD) Pollutants

Fluid medium of blood is called as A. PlasmaB. Serum C. Plasma Protein D. None of the above

The flower is important to a plant because it helps inA. AttractingB. Production of nectar C. PollinationD. All of the above

What is meant by reflex-action? With the help of a labelled diagram trace the sequence of the event which occurs when we touch a hot object.

When a small amount of garden soil is put into a glass jar containing water stirred and allowed to stand for two hours the layers from top to bottom would beA. Debris water sand and clayB. Humus water clay and sandC. Debris clay gravel and sandD. Humus clay gravel and sand

Green plants are (a)Complete food chain(b)First trophic level(c)Second trophic level(d)Third trophic level

What is a prokaryotic cell?A. It is primitive in organization B. It has a nucleoidC. Both A and BD. None of these

Choose the membrane from option below which separates scala media and scala tympani of cochlea.A. Reissner’s membraneB. Tectorial membraneC. Basilar membraneD. Tympanic membrane

Read the following statement.I. In a food chain there is a multidirectional flow of energy from the sun to producers consumer and decomposer.II. Shorter food chains provide more energy as compared to longer food chains.III. In an ecosystem no food chain is independent.IV. If 100 joules of energy is available at the producer level then the amount of energy present at the level of the secondary consumer is 10 joules.Which of these statements are correct?A. I and IIB. II and IIIC. III and IVD. I and IV

List four benefits to human life by eliminating the use of CFCs.

The size of the chest cavity increases during inhalation.(A) True(B) False

The six major elements constitute body mass(A) 85 % (B) 92 % (C) 98 %(D) 99.4 %

List out the salient features of the human genome project.