Bihar Board Class 10 · Science · Matric exam 2027
Bihar Board Class 10 Science Question Paper 2022
The board’s 2022 question paper — all 110 questions as printed; 74 objective answers from the board’s own key; full model answers for 3 written questions, how the answer begins for 26 more. Each question names its chapter, where that chapter’s most-asked questions are.
Full marks 80 · Time 2 h 45 min
Section A · Objective questions (80)
What kind of image is formed by the eye of an object?
- (A) Real, inverted and large
- (B) Virtual, erect and small
- (C) Virtual, inverted and large
- (D) Real, inverted and small ✓
Answer (the board’s key): (D)
What is used to measure electric current in an electric circuit?
- (A) Galvanometer
- (B) Voltmeter
- (C) Does not represent Voltmeter
- (D) Ammeter ✓
Answer (the board’s key): (D)
Which of the following does not represent electric power?
- (A) VI
- (B) V^2IR
- (C) I^2R
- (D) IR^2 ✓
Answer (the board’s key): (D)
Which of the following can form a real image of an object?
- (A) Glass slab
- (B) Convex lens ✓
- (C) Concave lens
- (D) None of these
Answer (the board’s key): (B)
The point where rays coming from a point-object meet after being refracted by a lens is called
- (A) Centre of curvature
- (B) Image point
- (C) Focus ✓
- (D) Optical centre
Answer (the board’s key): (C)
The objective of a photographic camera is
- (A) Concave mirror
- (B) Concave lens
- (C) Convex lens ✓
- (D) Convex mirror
Answer (the board’s key): (C)
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
- (A) A concave lens of 50 cm focal length
- (B) A convex lens of 50 cm focal length
- (C) A concave lens of 5 cm focal length
- (D) A convex lens of 5 cm focal length ✓
Answer (the board’s key): (D)
The focal lengths of a spherical mirror and a thin spherical lens are both -15 cm. The mirror and lens are likely to be
- (A) Mirror concave, lens convex
- (B) Mirror convex, lens concave
- (C) Both concave ✓
- (D) Both convex
Answer (the board’s key): (C)
Volt (V) is equal to
- (A) C/J
- (B) J/C
- (C) J/A
- (D) A/J
The rate of flow of electric charge is called
- (A) Electric current ✓
- (B) Electromotive force
- (C) Potential difference
- (D) None of these
Answer (the board’s key): (A)
Which of the following statements is true?
- (A) Joule = Volt x Ampere
- (B) Joule = Coulomb x Volt ✓
- (C) Joule = Ampere/Volt
- (D) Joule = Coulomb/Volt
Answer (the board’s key): (B)
- CHO reactive group is called
- (A) Ether group
- (B) Carbonyl group
- (C) Aldehydic group ✓
- (D) Alcoholic group
Answer (the board’s key): (C)
Which of the following gases is formed when ethanol is heated with concentrated H2SO4?
- (A) CH4
- (B) C2H2
- (C) C2H6 ✓
- (D) C2H4
Answer (the board’s key): (C)
Zinc blende is an ore of which of the following metals?
- (A) Hg
- (B) Zn ✓
- (C) Fe
- (D) Al
Answer (the board’s key): (B)
Which property is the same for elements in any period of the periodic table?
- (A) Atomic weight
- (B) Atomic volume
- (C) Valence electrons
- (D) Number of shells ✓
Answer (the board’s key): (D)
What type of reaction is CaO + H2O -> Ca(OH)2?
- (A) Decomposition
- (B) Combination
- (C) Addition
- (D) Displacement
Water soluble base is called
- (A) Acid
- (B) Base ✓
- (C) Salt
- (D) None of these
Answer (the board’s key): (B)
The chemical formula of soda ash is
- (A) CaCO3
- (B) Na2CO3 ✓
- (C) Ca(HCO3)2
- (D) NaHCO3
Answer (the board’s key): (B)
Which of the following is a different compound?
- (A) Limestone
- (B) Plaster of Paris ✓
- (C) Marble
- (D) Chalk
Answer (the board’s key): (B)
The chemical formula of baking soda is
- (A) CaCO3
- (B) Na2CO3 .10H2O
- (C) Ca(OH)2
- (D) NaHCO3 ✓
Answer (the board’s key): (D)
Which of the following is a corrosive acid?
- (A) Methanoic acid
- (B) Sulphuric acid ✓
- (C) Ethanoic acid
- (D) None of these
Answer (the board’s key): (B)
The pH value of milk of magnesia is
- (A) 4
- (B) 3
- (C) 7
- (D) 10.5 ✓
Answer (the board’s key): (D)
The number of electrons in the valence shell of sulphur is
- (A) 2
- (B) 4
- (C) 7
- (D) 6 ✓
Answer (the board’s key): (D)
Which of the following elements has the highest ionization energy?
- (A) Cl
- (B) F ✓
- (C) 1
- (D) Br
Answer (the board’s key): (B)
Which of the following units is equal to Watt (W)?
- (A) J/s ✓
- (B) J/sec^2
- (C) J^-1 s^-1
- (D) J^-2 s^-2
Answer (the board’s key): (A)
The coil of an electric heater is made of
- (A) Copper
- (B) Zinc
- (C) Tungsten
- (D) Nichrome ✓
Answer (the board’s key): (D)
The property of a circuit which converts electrical energy into heat is
- (A) Resistance ✓
- (B) Current
- (C) Potential difference
- (D) Power
Answer (the board’s key): (A)
The value of potential difference between the terminals of an electric cell when current is drawn from it is
- (A) More than electromotive force
- (B) Less than electromotive force ✓
- (C) Double the electromotive force
- (D) None of these
Answer (the board’s key): (B)
Non-renewable source of energy is
- (A) Coal ✓
- (B) Wind
- (C) Water
- (D) Sun
Answer (the board’s key): (A)
Wavelength is generally expressed
- (A) In meters ✓
- (B) In Hertz
- (C) In meters/second
- (D) None of these
Answer (the board’s key): (A)
The moving particle in an electric current flowing through a conducting wire is
- (A) Neutron
- (B) Proton
- (C) Electron ✓
- (D) None of these
Answer (the board’s key): (C)
How much work is done in moving 2 Coulombs of charge between two points of 12 V potential difference?
- (A) 2 Joules
- (B) 6 Joules
- (C) 12 Joules
- (D) 24 Joules ✓
Answer (the board’s key): (D)
Which plant did Mendel use for his genetics experiment?
- (A) Rose
- (B) Mango
- (C) Pea ✓
- (D) Potato
Answer (the board’s key): (C)
Which type of respiration releases more energy?
- (A) Aerobic ✓
- (B) Anaerobic
- (C) Both (A) and (B)
- (D) None of these
Answer (the board’s key): (A)
Male reproductive gland in humans is called
- (A) Testis ✓
- (B) Epididymis
- (C) Seminal vesicle
- (D) Vas deferens
Answer (the board’s key): (A)
An important characteristic of life is
- (A) Movement of molecule
- (B) Growth ✓
- (C) Union
- (D) Coordination
Answer (the board’s key): (B)
Autotrophic nutrition occurs
- (A) In plants ✓
- (B) In fungi
- (C) In some protists and prokaryotes
- (D) Both (A) and (C)
Answer (the board’s key): (A)
Glycolysis occurs
- (A) In mitochondria
- (B) In cytoplasm ✓
- (C) In Golgi complex
- (D) In chloroplast
Answer (the board’s key): (B)
Structural and functional unit of nervous system is called
- (A) Neuron ✓
- (B) Dendrite
- (C) Nephron
- (D) Cyton
Answer (the board’s key): (A)
Which enzyme acts on fat?
- (A) Amylase
- (B) Trypsin
- (C) Pepsin
- (D) Lipase ✓
Answer (the board’s key): (D)
Molecular formula of ozone is
- (A) O4
- (B) O3
- (C) O2
- (D) O5
Which pH value represents basic solution?
- (A) 2
- (B) 7
- (C) 13 ✓
- (D) 6
Answer (the board’s key): (C)
What is the ratio of number of atoms of hydrogen and oxygen in one molecule of water?
- (A) 1:1
- (B) 2:1
- (C) 3:1
- (D) 1:2
Which of the following elements represented by symbols is a metal?
- (A) 19/9 A
- (B) 24/12 B ✓
- (C) 12/6 C
- (D) 16/8 D
Answer (the board’s key): (B)
What will be the pH value of a solution of acidic oxide?
- (A) 12
- (B) 7
- (C) 8
- (D) 4 ✓
Answer (the board’s key): (D)
The hardest natural substance is
- (A) Silver
- (B) Iron
- (C) Diamond ✓
- (D) Coal
Answer (the board’s key): (C)
What is the colour of silver iodide?
- (A) White
- (B) Yellow ✓
- (C) Red
- (D) Green
Answer (the board’s key): (B)
Respiration is which type of chemical reaction?
- (A) Oxidation
- (B) Exothermic ✓
- (C) Combination
- (D) Reduction
Answer (the board’s key): (B)
Where are reproductive organs found in plants?
- (A) In root
- (B) In flower ✓
- (C) In stem
- (D) In fruit
Answer (the board’s key): (B)
Which part of the brain maintains the posture and balance of the body?
- (A) Forebrain
- (B) Hindbrain ✓
- (C) Midbrain
- (D) All of these
Answer (the board’s key): (B)
In which plant are stomata absent?
- (A) Mango
- (B) Hydrilla
- (C) Cactus
- (D) Oleander ✓
Answer (the board’s key): (D)
BS-IV is related to
- (A) With soil pollution
- (B) With noise pollution
- (C) With air pollution ✓
- (D) With water pollution
Answer (the board’s key): (C)
Carrier of oxygen in blood is
- (A) Fat
- (B) Hormone
- (C) Haemoglobin ✓
- (D) Carbohydrate
Answer (the board’s key): (C)
Which of the following is called birth hormone?
- (A) Tyrosine
- (B) Oxytocin ✓
- (C) Thyrotropin
- (D) Insulin
Answer (the board’s key): (B)
Seed develops from
- (A) From anther
- (B) From ovary
- (C) From stamen
- (D) From ovule ✓
Answer (the board’s key): (D)
Duodenum is a part of
- (A) Of large intestine
- (B) Of small intestine ✓
- (C) Of buccal cavity
- (D) Of stomach
Answer (the board’s key): (B)
What type of ecosystem is a pond?
- (A) Artificial
- (B) Natural ✓
- (C) Abiotic
- (D) None of these
Answer (the board’s key): (B)
Which of the following are present in maximum number in an ecosystem?
- (A) Producers ✓
- (B) Herbivores
- (C) Carnivores
- (D) Omnivores
Answer (the board’s key): (A)
Which of the following was not present on the earth before the origin of life?
- (A) CO2
- (B) NO2
- (C) O2 ✓
- (D) All of these
Answer (the board’s key): (C)
The frequency of alternating current produced in India is
- (A) 80 Hz
- (B) 70 Hz
- (C) 60 Hz
- (D) 50 Hz ✓
Answer (the board’s key): (D)
One microampere electric current is
- (A) 10^-7 A
- (B) 10^-6 A ✓
- (C) 10^-5 A
- (D) 10^-4 A
Answer (the board’s key): (B)
In which state is Narora Nuclear Power Plant located?
- (A) Rajasthan
- (B) Gujarat
- (C) Maharashtra
- (D) Uttar Pradesh ✓
Answer (the board’s key): (D)
What is used to obtain a spectrum?
- (A) Concave mirror
- (B) Convex mirror
- (C) Prism ✓
- (D) Glass slab
Answer (the board’s key): (C)
A magnified virtual image is formed by a convex lens when the object is at
- (A) At infinity
- (B) Between focus and lens ✓
- (C) At focus
- (D) Between focus and double focus distance
Answer (the board’s key): (B)
The number of elements in the first period of the periodic table is
- (A) 2 ✓
- (B) 8
- (C) 18
- (D) 32
Answer (the board’s key): (A)
From which of the following is it easiest to remove an electron?
- (A) M
- (B) M+
- (C) M^2+
- (D) M^3+
Which shell is the outermost shell for elements in the second period?
- (A) K-shell
- (B) L-shell ✓
- (C) M-shell
- (D) N-shell
Answer (the board’s key): (B)
Members of the saturated hydrocarbon series are called
- (A) Alkyne
- (B) Alkene
- (C) Alkane ✓
- (D) Alkanol
Answer (the board’s key): (C)
Which of the following elements was later substituted in the vacant spaces of the periodic table left by Mendeleev?
- (A) Gallium ✓
- (B) Oxygen
- (C) Phosphorus
- (D) Silicon
Answer (the board’s key): (A)
The last member of each period of the periodic table is
- (A) A metal
- (B) A halogen
- (C) An inert gas ✓
- (D) A metalloid
Answer (the board’s key): (C)
An element has two shells and both are completely filled with electrons. That element is
- (A) Neon ✓
- (B) Argon
- (C) Chlorine
- (D) Sodium
Answer (the board’s key): (A)
Which of the following is the most reactive halogen?
- (A) F ✓
- (B) Cl
- (C) Br
- (D) I
Answer (the board’s key): (A)
The hormone secreted by corpus luteum is
- (A) Androgen
- (B) Progesterone ✓
- (C) Estrogen
- (D) Testosterone
Answer (the board’s key): (B)
The source of energy in an ecosystem is
- (A) Rain water
- (B) Sunlight ✓
- (C) Air
- (D) Soil
Answer (the board’s key): (B)
The place of origin of humans is
- (A) India
- (B) China
- (C) Africa ✓
- (D) America
Answer (the board’s key): (C)
Which of the following is a sexually transmitted disease?
- (A) Typhoid
- (B) Gonorrhoea
- (C) AIDS
- (D) Both (B) and (C) ✓
Answer (the board’s key): (D)
The shape of human kidney is
- (A) Spherical
- (B) Rectangular
- (C) Bean-shaped ✓
- (D) None of these
Answer (the board’s key): (C)
The cause of physical changes occurring in adolescence is
- (A) Testosterone
- (B) Estrogen
- (C) Thyroxine
- (D) Both (A) and (B) ✓
Answer (the board’s key): (D)
The period of sexual maturity is called
- (A) Adolescence
- (B) Puberty ✓
- (C) Growth
- (D) None of these
Answer (the board’s key): (B)
Depletion of ozone layer is mainly caused by
- (A) Pollution
- (B) Pesticide
- (C) C.F.C.
- (D) Methane
Section B · Written questions (30)
What is nuclear fission?
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Model answer · nuclear fission
- 1.Nuclear fission is the process in which the nucleus of a heavy atom, such as uranium, plutonium or thorium, is split apart into lighter nuclei.1 mark
- 2.In this process, the heavy nucleus is bombarded with low-energy neutrons, due to which it becomes unstable and splits, and a tremendous amount of energy is released.1 mark
- Mention that it is a heavy nucleus (uranium, plutonium or thorium) that splits into lighter nuclei.
- State that the splitting happens when the nucleus is bombarded with neutrons.
- Write that a tremendous amount of energy is released in the process.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Write any two uses of concave mirror.
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Model answer · uses of concave mirror
- 1.Concave mirrors are often used as shaving mirrors to see a larger image of the face.1 mark
- 2.Concave mirrors are commonly used in torches, search-lights and vehicles headlights to get powerful parallel beams of light.1 mark
- Write 'shaving mirror' and 'larger image of the face' for the first use.
- Write 'headlights' and 'powerful parallel beams of light' for the second use.
- Give exactly two uses as asked, not more.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Define electric potential and write its SI unit.
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Model answer · electric potential, definition
- 1.The electric potential at a point is the work done in bringing a unit positive charge from infinity to that point.1 mark
- 2.The SI unit of electric potential is volt.1 mark
- Write 'unit positive charge' and 'infinity' in the definition.
- State clearly that the SI unit is volt.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Is fossil fuel renewable? Give reason.
How the model answer begins
1. Fossil fuel is not a renewable source of energy. The fossil fuels are non-renewable sources of energy.
The full answer from Medha Ma’am →Write Ohm's law.
How the model answer begins
1. The potential difference, V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same. This is called Ohm's…
The full answer from Medha Ma’am →What is defect of vision? How many types of it are there?
How the model answer begins
1. Defect of vision is the condition in which the eye may gradually lose its power of accommodation, so that the person cannot see the objects distinctly and comfortably. The vision becomes blurred due to the refractive…
The full answer from Medha Ma’am →Distinguish between alternating current and direct current.
How the model answer begins
1. Alternating current (AC) is the current whose magnitude and direction change continuously with time.
The full answer from Medha Ma’am →Why does the sun appear red at the time of sunrise?
How the model answer begins
1. At the time of sunrise, the Sun is near the horizon. Light from the Sun near the horizon passes through thicker layers of air and larger distance in the earth's atmosphere before reaching our eyes.
The full answer from Medha Ma’am →In a concave mirror, prove that 1/v + 1/u = 1/f
How the model answer begins
1. Take a concave mirror with pole P, principal focus F and centre of curvature C on its principal axis. An object AB is placed perpendicular to the principal axis, between the centre of curvature and infinity. The ray…
The full answer from Medha Ma’am →Draw a labelled diagram of an electric motor. Explain its principle and working. What is the importance of split ring in an electric motor?
How the model answer begins
1. A labelled diagram of an electric motor is drawn showing the rectangular coil ABCD, the two poles (N and S) of the magnetic field, the split ring with its two halves P and Q, the conducting stationary brushes X and Y,…
The full answer from Medha Ma’am →Mention any two advantages of groundwater.
How the model answer begins
1. Groundwater is used for irrigation which leads to an increase in agricultural production.
The full answer from Medha Ma’am →Write the molecular formula of Plaster of Paris. What are its uses?
How the model answer begins
1. The chemical formula of Plaster of Paris is CaSO4.1/2H2O. It is calcium sulphate hemihydrate, obtained by heating gypsum at 373 K.
The full answer from Medha Ma’am →What is a balanced chemical equation? Write the balanced form of the following equation: Al (s) + H2SO4 (aq) -> Al2(SO4)3 (aq) + H2 (g)
How the model answer begins
1. A balanced chemical equation is a chemical equation in which the number of atoms of each element in the reactants and products is equal. In other words, the number of atoms of each element remains the same before and…
The full answer from Medha Ma’am →When copper shavings are heated in air for a long time, a black layer forms on it. On passing hydrogen gas over it, its brown colour returns. Which reactions take place here? Write the names and equations of the reactions.
How the model answer begins
1. When copper turnings are heated in air for a long time, oxygen is added to copper and a black coating of copper(II) oxide is formed on the surface. This reaction is called an oxidation reaction, given as: 2Cu + O2…
The full answer from Medha Ma’am →What is an ore?
Why should curd and sour substances not be kept in brass and copper vessels?
How the model answer begins
1. Curd and sour substances contain acid, such as lactic acid in curd (sour milk) and acetic acid in vinegar.
The full answer from Medha Ma’am →How is iron protected from rusting?
How the model answer begins
1. Iron objects are protected from rusting by applying a layer of paint, oil, grease, or varnish on their surface. This layer prevents the iron object from coming into contact with moisture and air, which are the…
The full answer from Medha Ma’am →What is covalent bond? Give two examples of it.
How the model answer begins
1. Such bonds which are formed by the sharing of an electron pair between two atoms are known as covalent bonds. In the formation of this bond, the shared pair of electrons belongs to the outer shells of both the atoms and…
The full answer from Medha Ma’am →Mention five importance of pH in our daily life.
How the model answer begins
1. Our body works within the pH range of 7.0 to 7.8. Living organisms can survive only in a narrow range of pH change, so this pH value of the body must be maintained for the survival of plants and animals.
The full answer from Medha Ma’am →What is hydrocarbon? How many types of it are there?
How the model answer begins
1. Compounds formed by the combination of hydrogen and carbon are called hydrocarbons.
The full answer from Medha Ma’am →What is double circulation of blood?
How the model answer begins
1. Double circulation is the process in which blood goes through the heart twice during each cycle of passage through the body.
The full answer from Medha Ma’am →Describe the accessory organs of a typical flower.
How the model answer begins
1. The accessory organs of a flower are the calyx and corolla which do not directly participate in reproduction. The calyx is the outermost whorl made up of sepals and the corolla is the whorl made up of petals, lying…
The full answer from Medha Ma’am →What is vegetative reproduction?
How the model answer begins
1. Vegetative reproduction or vegetative propagation is the process of producing new plants from vegetative parts of the plant body like root, stem, or leaf.
The full answer from Medha Ma’am →Distinguish between artery and vein.
How the model answer begins
1. Arteries are the vessels which carry blood away from the heart to various organs of the body. Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls.
The full answer from Medha Ma’am →What type of respiration is fermentation? Where does it occur?
How the model answer begins
1. Fermentation is a type of anaerobic respiration, since this process takes place in the absence of air (oxygen). In fermentation, the pyruvate formed from the break-down of glucose is converted into ethanol and carbon…
The full answer from Medha Ma’am →How does translocation of food occur in plants?
How the model answer begins
1. The translocation of food and other substances in plants takes place in the part of the vascular tissue known as phloem. It occurs in the sieve tubes with the help of adjacent companion cells, both in upward and…
The full answer from Medha Ma’am →What is the role of platelets in blood clotting?
How the model answer begins
1. When a blood vessel is cut or injured, the blood has platelet cells which circulate around the body and plug these leaks by helping to clot the blood at these points of injury. Thus platelets aggregate at the site of…
The full answer from Medha Ma’am →What are the different methods of contraception?
How the model answer begins
1. Barrier methods of contraception are the creation of a mechanical barrier so that sperm does not reach the egg. Condoms worn on the penis or similar coverings worn in the vagina can serve this purpose.
The full answer from Medha Ma’am →What is a neuron? Label the neuron with a clear diagram.
How the model answer begins
1. A neuron is the structural and functional unit of the nervous system. Nervous tissue is made up of an organised network of nerve cells or neurons, and is specialised for conducting information via electrical impulses…
The full answer from Medha Ma’am →What is food chain? Explain it with an example.
How the model answer begins
1. The process of transfer of energy from one organism to another is called a food chain. The series of organisms taking part at various biotic levels, each feeding upon the one before it, forms this food chain. Each step…
The full answer from Medha Ma’am →
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