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Class 9 Science Question Answers

Question Answer

Class 9

Science

Master Class 9 Science: Engagi...

Class 9 Science Question Answers

Name an important source from which naphthalene balls are obtained.

Calculate the molecular mass of caustic potash- A. K2 OH = 95 gmol−1 B. KOH = 56 gmol−1 C. K(OH)2 = 73 gmol−1 D. KOH = 58 gmol−1

What is Jhum cultivation?

Define the life span. Give the lifespan of an elephant.

Branch dealing with the study of cells(a) Histology(b) Cytology(c) Morphology(d) Anatomy

Do all meals contain the same food items?

Atomicity of phosphorus is:(a) one(b) two(c) three(d) four

The second division of meiosis is (a) Equational division(b) Reductional division(c) Multiplied division(d) None of the above

Depending upon the mode of nutrition Algae falls undera. Photoautotrophsb. Chemoautotrophsc. Detritivoresd. Parasites

Protein rich algae isA. PolysiphoniaB. SpirulinaC. GelidiumD. Cosmarium

Which structure performs the function of mitochondria in bacteria?A. NucleoidB. RibosomesC. Cell wallD. Mesosomes

Which plant tissue remains in an active metabolic state always?

Why is air considered as a mixture?

Name the two organelles in a plant cell that contain their genetic material and ribosomes.a. Mitochondria and Golgi bodyb. Endoplasmic reticulum and Golgi bodyc. Mitochondria and plastidsd. Golgi body and platelets

Membrane system considered to be extension of infolded plasma membrane isA) Golgi complexB) PlastidsC) MitochondriaD) Endoplasmic reticulum

The _____that we drink which comes from cows buffaloes and goats is an animal product.

Study of wood is called asA) DendrochronologyB) MorphologyC) HistologyD) Xylology

F1 particle occurs inA. MitochondriaB. ChloroplastsC. RibosomesD. Rough endoplasmic reticulum.

The recipe of mamidi tandra requires:A.SugarB.JaggeryC.SaltD.Both A and B

Who stated first of all that new cells are formed from a division of pre-existing cells?

Percentage of freshwater in the hydrosphere isA) 2.5%B) 30%C) 13%D) 33%

Why are the plants that inhabit a desert are not found in a mangrove? Give reasons.

Mineral and metals are A. Biodegradable resourcesB. Renewable C. Non- renewable D. Renewable and non - renewable resources

Aqueous solution of which of the following compounds is the best conductor of electric current? A. ammonia, NH3 B. fructose, C6H12O6 C. acetic acid, C2H4O2 D. hydrochloric acid, HCl

What are creepers? Write an example.

If cells of onion peel and RBC are separately kept in a hypotonic solution what among the following will take place? A) Both the cells will swellB) RBC will burst easily while cells of onion peel will resist the bursting to some extentC) A and B both are correctD) RBC and onion peel cells will behave similarly

What is personal health and community health?

An egg cell has 10 pg of DNA in its nucleus. How much DNA will be in this animal at the end of G2-phase of mitosis?A) 10 pgB) 20 pgC) 30 pgD) 40 pg

Body of Euspongia is mainly composed ofA) SpiculesB) Spongin fibresC) MesogloeaD) Nematoblasts

Assertion: Cell theory was put forward by Schleiden and Schwann.Reason: It is applicable to all cells including viruses.A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.B. Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.C. Assertion is correct but reason is incorrect.D. Both Assertion and reason are incorrect.

At places the groundwater is stored between layers of hard rock below the water table .this is known as __________.A.a reservoirB.an aquiferC.a hard waterD.a well water

Arrange in the order indicated for solids liquids and gases:i) Decreasing order- empty space between ii) Increasing order- tendency to flowA. i) Solid liquid gases ii) gases liquids solidsB. i) Solid liquid gases ii) solids gases liquidsC. i) Gases liquid solids ii) solid liquid gasesD. i) Solids gases liquid ii) gases solids liquids

Which of the following food items are stored in cold storage?A. CerealsB. FruitsC. VegetablesD. Both B and C

How do you calculate the atomic number of an element?

Explain how forests prevent floods.

How does a kangaroo protect itself?

The sources of rice and food grains is(A) Plant (B) Animal (C) Both A and B(D) None of the above

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change? A) Baking PowderB) LimeC) Ammonium hydroxide) Hydrochloric Acid

How do I calculate the average atomic mass of the element X?IsotopeAbundanceMass${}^{221}X$74.22220.9${}^{220}X$12.78220.0${}^{218}X$13.00218.1

What are cells and who has given the term cell?

What is a thallus organisation?

Do humans have chloroplast?

What is the “jelly-like” substance that fills the cell?

How does DNA differ in a eukaryotic and prokaryotic cell?

What do proteins do in a cell membrane?

What are some examples of abiogenesis?

Endoplasmic reticulum is in continuation with?

Separation of seeds from cotton fibers is known as?

Which of the following groups of organelles are present in eukaryotic cells specifically the plant and animal cells?A) The mesosome endoplasmic reticulum Golgi bodies mitochondria and lysosomesB)The endoplasmic reticulum Golgi bodies cytoplasm nucleoid nucleus and nucleolusC) The mitochondria nucleus cytoplasm cell membrane Golgi bodies and endoplasmic reticulumD) The nucleoid mesosome and pili

What is the size range of an eukaryotic cell?

Who discovered the Golgi body?

Name the middle ear ossicles. What is their evolutionary origin?

Is steapsin present in pancreatic juice?

Rice Wheat and Maize are rich in

How is an egg a single cell? And if it is where is all that mitochondria and stuff?

Where is the cell membrane located?

What is the term used for blood lacking corpuscles and fibrinogen?

What is cytology?

The boiling point of water is:a.) 0°Cb.) 100°Cc.) -0°Cd.) -100°C

Carbon reduction method is employed for commercial extraction of: This question has multiple correct options$A.$ Haematite$B.$ Cassiterite$C.$ Iron pyrite$D.$ Corundum

Name the product formed when carbon dioxide reacts with water.

Which of the following is not part of Atomic theory?A.) Compounds are made up of combinations of atomsB.) All atoms of the given element are alikeC.) All matter is composed of atomsD.) A chemical reaction involves the rearrangement of atomsE.) The atom is mainly empty space

Silk fibre is obtained froma.) Fleece of sheepb.) Cotton ballc.) Cocoond.) Shiny jute stalk

Write the name and formula of an acidic salt.

If the relative molecular mass of ammonium nitrate is 80 calculate the percentage of nitrogen and oxygen in ammonium nitrate. (N = 14 H = 1 O = 16).A.40% 50%B.40% 60%C.35% 60%D.35% 40%

What is anode mud?

Which of the following is a secondary air pollutant?(A) Ozone(B) Carbon dioxide(C) carbon monoxide(D) Surfer dioxide

State an example of gas in solid solution.

Which of the following is not a mixture but a compound?a.) Soda waterb.) Sea waterc.) Soild.) None of above

Which of the following processes is used to separate cream from milk?A. FiltrationB. DistillationC. ChromatographyD. Centrifugal Separation

Which of the following is not a green-house gas? A.CO2 B.N2O C.O3 D.N2

Give an example of liquid in liquid type solution.

Write the chemical formula of sodium carbonate.

Tyndall effect is not observed in:SuspensionTrue solutionEmulsionsColloidal solution

During fractional distillation of petroleum, different fractions are obtained. Its name, number of atoms of carbon, the temperature range at which it is obtained and its use are given. There is an error in one of the alternatives. In which alternative there is an error?

Which environmental segment interacts with all the other environmental segments?(A) Atmosphere(B) Biosphere(C) Lithosphere(D) Hydrosphere

Why is rayon also known as artificial silk? Give its two uses.

Haematite is an ore of:(A) Fe(B) Zn(C) Cu(D) Al

Which of the following is an acidic gasA.Hydrogen sulphideB.Carbon dioxideC.ArgonD.Both A and B

The centrifuge consists of a centrifuge tube holder called:\tA.MotorB.RotorC.Moving tubeD.Both a and b

Tyndall effect is applicable when:The diameter of the dispersed particle is not much smaller than the wavelength of light used.B. the diameter of the dispersed particle is much smaller than the wavelength of light used.C. The refractive indices of the dispersed phase and the dispersion medium are the same.D. the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

Which of the following is the separation technique to separate mercury and water?(A) separating funnel(B) sublimation(C) filtration followed by evaporation(D) separating funnel followed by evaporation or distillation.

Differentiate between roasting and calcination.

Which of the following activities proves that particles of particles of matter have space between them?(A) dissolution of sugar into water(B) dilution of potassium permanganate solution(C) breaking the stream of water(D) none of the above

Define latent heat of fusion.What is the full form of CNG?

Saree dhoti lungi or turban is used as an un-stitched piece of fabric.A) TrueB) False

Which metal is found in liquid state at room temperature?A. IronB. ZincC. MercuryD. Aluminium

Silver is a good conductor of electricity. Yet electricity wires are not made up of silver. Why?

We are able to smell cooked food from a distance. Which property of matter does it reflect?A. The particles move faster at lower temperature.B. The particles of matter are continuous.C. Particles of different matters have different forces of attraction.D. Particles of matter can mix with each other.

Pure substances are characterized by:(A) variable melting points.(B) non-uniform composition.(C) variable properties.(D) fixed boiling points.

What types of material can we separate by using handpicking?

The correct option among the following is:a.) Colloidal particles in lyophobic sols can be precipitated by electrophoresisb.) Brownian motion in colloidal solution is faster the viscosity of the solution is very highc.) Colloidal medicines are more effective because they have small surface aread.) Addition of alum of water makes it unfit for drinking

Gases released due to the burning of fossil fuels is \/are:(This question has multiple correct options)A) Carbon monoxideB) Sulphur dioxideC) Nitrogen oxideD) Hydrocarbon

Photochemical smog is related to pollution ofA) AirB) WaterC) SoilD) Nostoc

What does a symbol represents A.Name of an elementB.One atom of elementC.Quantity element equal in mass to its atomic massD.All of the above

If W is the atomic weight and N is the atomic number of an element thena.) Number of electrons = W - Nb.) Number of neutrons = W - Nc.) Number of hydrogen atoms = W - Nd.) Number of neutrons = N

The symbol of silver is S.A. True B. False

Silk is obtained from ......... of the silk moth. A.Pupa B.Larva C.Cocoon D.caterpillar

Name the three states of matter. Give one example of each.

Identify A-F in the given flow chart. A) A: Jelly B: Shaving Cream C: Milk D: Fog E: Cheese F: Gemstones B) A: Milk of Magnesia B: Shaving Cream C: Mud D: Cloud E: Butter F: Gemstones C) A: Cloud B: Shaving Cream C: Jelly D: Fog E: Rubber F: Gemstones D) A: Fog B: Shaving Cream C: Milk D: Mud E: Jelly F: Gemstones