Bihar Board Class 10 · Science · Matric exam 2027
Bihar Board Class 10 Science Model Paper 2023
The board’s 2023 model paper — all 110 questions as printed. 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)
Which of the following has maximum refractive index ?
- (A) Air
- (B) Diamond
- (C) Glass
- (D) Water
The focal length of a concave mirror is -
- (A) Negative
- (B) Positive
- (C) Zero
- (D) Sometimes negative, sometimes positive
What is the number of principal focus in a lens ?
- (A) 1
- (B) 2
- (C) 3
- (D) 4
Which mirror is suitable for shaving ?
- (A) Convex
- (B) Concave
- (C) plane
- (D) None of these
The relation between focal length (F) and radius of curvature (R) of a concave mirror is -
- (A) F = R
- (B) F = 2R
- (C) F = R/2
- (D) F = 4R
Which of the following lens is called converging lens ?
- (A) Concave lens
- (B) Convex lens
- (C) both convex lens and concave lens
- (D) Bifocal lens
Which colour has minimum wavelength in visible light ?
- (A) Yellow
- (B) Violet
- (C) Red
- (D) Green
The twinkling of stars represents which phenomenon of light ?
- (A) deflection of light
- (B) reflection of light
- (C) scattering of light
- (D) refraction of light
In which of the following, the speed of light is maximum ?
- (A) in air
- (B) in glass
- (C) in vacuum
- (D) both (A) and (B)
How many laws of refraction of light are there ?
- (A) 1
- (B) 2
- (C) 3
- (D) 4
Which energy is converted by a hydroelectric plant into electrical energy ?
- (A) Nuclear energy
- (B) Solar energy
- (C) potential energy
- (D) Thermal energy
The burning Candle changes -
- (A) electrical energy into light energy.
- (B) chemical energy into light energy.
- (C) sound energy into light energy
- (D) none of these
The potential difference across an electric cell upon drawing current becomes -
- (A) more than emf
- (B) less than emf
- (C) double the emf
- (D) none of these
To increase the value of the resistance, resistors should be connected-
- (A) in parallel
- (B) in series
- (C) in both (A) and (B)
- (D) None of these
The rod, which is generally used to make electromagnet is -
- (A) Copper
- (B) Soft iron
- (C) Steel
- (D) none of these
Which process is done at higher temperature ?
- (A) nuclear fission
- (B) nuclear fussion
- (C) both (A) and (B)
- (D) none of these
A device that converts solar energy directly into electricity is -
- (A) Solar cooker
- (B) Solar cell
- (C) Both (A) and (B)
- (D) none of these
What should be the minimum speed of wind in a wind electric generator ?
- (A) 150 km/h
- (B) 1.5 km/h
- (C) 12-14 km/h
- (D) None of these
Electromotive force of a cell is -
- (A) the force exerted by the cell on unit charge
- (B) the work done by the cell on unit charge
- (C) potential difference
- (D) none of these
Which current is mainly used in domestic circuit ?
- (A) alternating current
- (B) variable direct current
- (C) direct current
- (D) none of these
Dispersion is impossible in -
- (A) glass
- (B) vacuum
- (C) water
- (D) fibre
A glass prism placed in air bends an incident ray -
- (A) upward
- (B) downwards
- (C) away from the base
- (D) towards the base
2Zn + O2 -> 2ZnO is which type of reaction ?
- (A) Decomposition
- (B) Displacement
- (C) Precipitation
- (D) Oxidation
What is the chemical formula of baking soda ?
- (A) NaHCO3
- (B) NH4Cl
- (C) Na2CO3
- (D) none of these
The metal which remains in liquid state at room temperature is -
- (A) copper
- (B) mercury
- (C) sodium
- (D) iron
The element of zero group of Periodic Table is -
- (A) H
- (B) He
- (C) O
- (D) Cl
On adding methyl orange solution to the aqueous solution of sodium carbonate, the colour of the solution changes to which of the following?
- (A) Yellow
- (B) Red
- (C) Pink
- (D) Green
Which of the following gases is responsible for global warming ?
- (A) NH3
- (B) CO2
- (C) O2
- (D) N2
What is the atomic number of sulphur ?
- (A) 2
- (B) 4
- (C) 8
- (D) 16
The aqueous solution of an acid conducts electricity, because in water acids are -
- (A) ionized
- (B) insoluble
- (C) soluble
- (D) none of these
The oxides of metals are generally -
- (A) alkaline
- (B) acidic
- (C) neutral
- (D) none of these
Which of the following metals is mixed with gold to form an alloy ?
- (A) Cu
- (B) Zn
- (C) K
- (D) Fe
NaCl + AgNO3 -> AgCl + NaNO3 is which of the following types of reaction ?
- (A) Displacement
- (B) Combination
- (C) Double displacement
- (D) Dissociation
Silicon is a -
- (A) nonmetal
- (B) metal
- (C) metalloid
- (D) none of these
Elements whose outer shell is completely filled are known as -
- (A) transition elements
- (B) Halogens
- (C) alkaline earth metals
- (D) Noble gases
The chemical formula of chalk is -
- (A) Ca(HCO3)2
- (B) CaOCl
- (C) CaCl2
- (D) CaCO3
Which of the following is the most acidic oxide ?
- (A) SO2
- (B) CaO
- (C) Na2O
- (D) MgO
Which of the following is an alkyne ?
- (A) CH4
- (B) C2H4
- (C) C2H2
- (D) C2H6
The IUPAC name of CH3-O-C2H5 is -
- (A) methoxy ethane
- (B) ethyl methyl ether
- (C) ethoxy methane
- (D) propanone
Which of the following compounds can be used as fuel ?
- (A) propanol
- (B) ethanoic acid
- (C) ethanol
- (D) all of these
Which of the following products are formed when sodium hydroxide reacts with zinc ?
- (A) NaZnO2 + H2
- (B) Na2ZnO2 + H2
- (C) Na2Zn2+H2
- (D) Na2ZnO+H2
What is the chemical formula of washing soda ?
- (A) Na2CO3.10H2O
- (B) NaHCO3
- (C) CaCO3
- (D) Ca(OH)2
The ratio of conc. HNO3 and conc. HCl in aqua regia is -
- (A) 1 : 3
- (B) 3 : 1
- (C) 2 : 2
- (D) 2 : 3
The substances that takes part in a reaction are called -
- (A) product
- (B) reactant
- (C) oxidizing agent
- (D) reducing agent
Which of the following is an acidic oxide ?
- (A) CuO
- (B) MgO
- (C) CaO
- (D) SO2
An aqueous solution of which of the following substance turns blue litmus into red ?
- (A) acid
- (B) base
- (C) Both acid and base
- (D) none of these
What is the normal pH value of a healthy body ?
- (A) 5-7
- (B) 2-3
- (C) 7.0-7.8
- (D) 9.0-9.5
Which of the following compounds is soluble in water ?
- (A) Carbon disulphide
- (B) Benzene
- (C) Methane
- (D) Glucose
Which of the following is amalgam ?
- (A) Cu-Sn
- (B) Na-Hg
- (C) Cu-Zn
- (D) Pb-Sn
Which of the following metals can displace zinc from zinc sulphate solution ?
- (A) Titanium
- (B) Platinum
- (C) Copper
- (D) Aluminium
Blood vessels which carry oxygenated blood from the heart to different body parts are called -
- (A) ventricle
- (B) veins
- (C) auricle
- (D) arteries
The light yellow-coloured sticky substance in the blood is called -
- (A) lymph
- (B) serum
- (C) plasma
- (D) none of these
On the leaves of which type of plants is the stomata absent ?
- (A) Xerophytes
- (B) Submerged Hydrophytes
- (C) Angiosperm
- (D) None of these
Fermentation process is found in -
- (A) Yeast
- (B) Hydra
- (C) Amoeba
- (D) None of these
A fully matured ovary is called -
- (A) seed
- (B) fruit
- (C) ovule
- (D) none of these
The chemical formula of glucose is -
- (A) C12H22O11
- (B) C6H12O6
- (C) CH3COOH
- (D) CH3CHO
Which among the following is called the photosynthetic unit of plant ?
- (A) Chloroplast
- (B) Plastid
- (C) Chlorophyll
- (D) Quantasome
The cause of ovulation is -
- (A) estrogen
- (B) LH
- (C) FSH
- (D) none of these
In which of the following organisms asexual reproduction does not occur through binary fission ?
- (A) Leishmania
- (B) Paramecium
- (C) Yeast
- (D) Amoeba
How is the balance of oxygen maintained in nature ?
- (A) by combination reaction
- (B) by photosynthesis
- (C) by decomposition
- (D) none of these
Which of the following juices play a role in the digestion of food ?
- (A) bile juice
- (B) pancreatic juice
- (C) intestinal juice
- (D) all of these
Trypsin enzyme is found in -
- (A) gallbladder
- (B) pancreatic juice
- (C) intestinal juice
- (D) gastric juice
The longest part of the alimentary canal is -
- (A) pharynx
- (B) small intestine
- (C) stomach
- (D) oesophagus
Where does the process of digestion begin in humans ?
- (A) pharynx
- (B) buccal cavity
- (C) stomach
- (D) small intestine
Which of the following helps in digestion of fats ?
- (A) ptyalin
- (B) lipase
- (C) maltase
- (D) lactase
The process of glycolysis takes place in -
- (A) nucleus
- (B) cytoplasm
- (C) mitochondria
- (D) stomata
Ozone layer is -
- (A) Harmful
- (B) Beneficial at high temperature
- (C) Beneficial
- (D) None of these
Which of the following is the male reproductive organ in a flower ?
- (A) Anther
- (B) Petal
- (C) Thalamus
- (D) None of these
How much energy is released by the breakdown of ATP during respiration in plants ?
- (A) 30.5 kj/mol
- (B) 305 kj/mol
- (C) 3.5 kj/mol
- (D) none of these
Ethyl alcohol is made from which type of respiration ?
- (A) aerobic
- (B) anaerobic
- (C) fermentation
- (D) None of these
Which granules present in the blood take part in the transport of respiratory gases ?
- (A) Red blood cells
- (B) White blood cells
- (C) Both (A) and (B)
- (D) None of these
Plant wastages are stored in -
- (A) leaf
- (B) bark
- (C) cellular vacuoles
- (D) all of these
Which part of the alimentary canal of man does not secrete any enzyme ?
- (A) mouth
- (B) oesophagus
- (C) stomach
- (D) none of these
Concentration of urine depends upon the presence of whom ?
- (A) Thyroxin
- (B) ADH
- (C) Vasopressin
- (D) Melatonin
Which hormone is not associated with growth of plant ?
- (A) Auxins
- (B) Gibberellins
- (C) Cytokinins
- (D) Abscisic Acid
The human heart is a part of which system ?
- (A) digestive system
- (B) respiratory system
- (C) excretory system
- (D) circulatory system
The branch of biology that deals with the study of inheritance of character is -
- (A) Cytology
- (B) Genetics
- (C) Evolution
- (D) None of these
Which of the following gas is taken in during respiration ?
- (A) CO2
- (B) O2
- (C) N2
- (D) SO2
How many Carbon atoms are in glucose ?
- (A) 4
- (B) 6
- (C) 8
- (D) 12
In the brain the control center for involuntary action is located -
- (A) in medulla
- (B) in forebrain
- (C) in midbrain
- (D) in hindbrain
Section B · Written questions (30)
Write down any two properties of magnetic lines of force ?
What is a biogas plant ?
Which quantity remains constant in Ohm's law ? Explain.
How does scattering in air depend upon wavelength ?
What do you mean by power of accommodation of the eye ?
Define refraction index of a medium. What is its unit ?
Write the problems faced in the construction of big dams.
How does the eye control the amount of light entering it ?
What do you understand by alternating current and direct current ? Differentiate between them.
Describe a method for determination of focal length of a concave mirror.
What are amphoteric substances ? Explain with examples.
Write balanced chemical equations for the following reactions - (i) zinc(s) + Sulphuric acid(aq) -> zinc sulphate(aq) + Hydrogen(g) (ii) Barium chloride(aq) + Sulphuric acid(aq) -> Barium Sulphate(s) + Hydrochloric acid (aq)
What happens when zinc is added to ferrous sulphate solution ? Write chemical equation for the reaction.
What is corrosion ? Explain with example.
What effects are caused on body after drinking alcohol ?
Why have detergents replaced soap?
Ionic compounds have high melting and boiling points. Why?
Diamond is a bad conductor of electricity, but graphite is a good conductor. Why?
Write structural formula of the following compounds - (A) Bromopropane (B) Propanal (C) Hexane (D) Benzene (E) Propene
What is an alloy ? Give two examples. Discuss three uses of alloys.
Why does the process of photosynthesis take place only in chloroplast ?
Describe the function of the nervous system.
What is reflex action ?
DNA is the basis of heredity, How ?
Write any two differences between respiration and combustion.
What do you understand by glycolysis ?
Name any four plant hormones.
Write the full form of following. (i) IUCD (ii) OC
Define photosynthesis. Explain the process of photosynthesis in brief.
Explain the process of digestion in humans with a labelled diagram of the digestive system.
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