Bihar Board Class 10 · Science · Matric exam 2027
Bihar Board Class 10 Science Model Paper 2021
The board’s 2021 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)
The focal length of which mirror is negative ?
- (A) Plane mirror
- (B) Concave mirror
- (C) Convex mirror
- (D) None of these
What is the relation between focal length (f) and radius of curvature (R) of a mirror?
- (A) f = R
- (B) f = R/2
- (C) f = 2R
- (D) f = 3/2 R
The least distance of distinct vision for the normal eye is
- (A) 25 m
- (B) 25 cm
- (C) 25 mm
- (D) None of these
Which colour of white light bends least when the light passes through a prism ?
- (A) Violet
- (B) Blue
- (C) Red
- (D) Yellow
The image formed on the retina of human eye is -
- (A) Virtual and erect
- (B) Real and inverted
- (C) Virtual and inverted
- (D) Real and erect
The colour of sky appears blue.
- (A) Due to reflection of light
- (B) Due to scattering of light
- (C) Due to refraction of light
- (D) None of these
Which mirror makes a large image of the object?
- (A) Plane Mirror
- (B) Concave Mirror
- (C) Convex mirror
- (D) None of these
Which one of the following lens is used to correct short sightedness ?
- (A) Convex lens
- (B) Plano Convex lens
- (C) Concave lens
- (D) None of these
Which of the following instrument detects the presence of electric current ?
- (A) Galvanometer
- (B) Motor
- (C) Generator
- (D) Voltmeter
Who stated the “Right Hand Thumb rule” ?
- (A) Oersted
- (B) Fleming
- (C) Einstein
- (D) Maxwell
The S.I. unit of Potential difference is
- (A) Volt
- (B) Ohm
- (C) Ampere
- (D) Coulomb
In which of the following combination the value of resistance increases?
- (A) Series
- (B) Parallel
- (C) Both series and parallel
- (D) None of these
Nature of magnetic lines of force is
- (A) Imaginary
- (B) Real
- (C) Both Real and imaginary
- (D) None of these
1 Kilowatt-hour is equal to -
- (A) 0.36 x 10^10 Joule
- (B) 1.6 x 10^-19 Joule
- (C) 3.6 x 10^6 Joule
- (D) None of these
What is the source of Renewable energy ?
- (A) Nuclear Energy
- (B) Solar Energy
- (C) Coal Energy
- (D) Natural Gas Energy
Which lens is also known as diverging lens ?
- (A) Concave lens
- (B) Convex lens
- (C) Both Concave and Convex lens
- (D) None of these
Which is the Primary colour of Light ?
- (A) Red
- (B) Blue
- (C) Green
- (D) All of these
Which of the following part of eye is coloured ?
- (A) Cornea
- (B) Pupil
- (C) Retina
- (D) Iris
1 HP is equal to -
- (A) 746 watt
- (B) 760 watt
- (C) 780 watt
- (D) 550 watt
Magnifying glass is -
- (A) Concave lens
- (B) Convex lens
- (C) Concave mirror
- (D) Convex mirror
When electric current flows through a conducting wire then moving Particle is ?
- (A) Atom
- (B) ion
- (C) Proton
- (D) Electron
ampere-hour is unit of -
- (A) Power
- (B) Charge
- (C) Energy
- (D) None of these
Which of the following unit is equal to Watt ?
- (A) J/S
- (B) J.S
- (C) S/J
- (D) None of these
The unit of electrical current is
- (A) Ampere
- (B) Volt
- (C) Ohm
- (D) Watt
Which gas is responsible for global warming ?
- (A) O_2
- (B) NH_3
- (C) CO_2
- (D) N_2
Which type of reaction is digestion of food in body ?
- (A) Oxidation
- (B) Combination
- (C) Displacement
- (D) Reduction
Which type of reaction occurs when water is dropped on quick lime?
- (A) Exothermic
- (B) Endothermic
- (C) Explosive
- (D) None of these
Which of the following is the most reactive ?
- (A) Cu
- (B) Hg
- (C) Ag
- (D) Au
The chemical formula of lime water is -
- (A) CaO
- (B) CaCl_2
- (C) CaOCl_2
- (D) Ca(OH)_2
A solution turns red litmus into blue, its pH value is -
- (A) 11
- (B) 10
- (C) 5
- (D) 'A' and 'B' both
How many covalent bonds are there between C-C atoms in alkyne?
- (A) 1
- (B) 2
- (C) 3
- (D) 4
What is the molecular formula of glucose ?
- (A) C6H12O6
- (B) CH3COOH
- (C) CH3CHO
- (D) CHCl3
Sodium salts of higher fatty acids are known as -
- (A) Soap
- (B) Detergent
- (C) Plastic
- (D) Rubber
Functional group -CHO is known as
- (A) Aldehyde
- (B) Alcohol
- (C) Ketone
- (D) None of these
On moving from left to right in a period of periodic table, atomic radius of element -
- (A) decreases
- (B) first decreases and then increase
- (C) does not change
- (D) increases
Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, F -
- (A) F<O<C<Be<Li
- (B) Li<Be<C<O<F
- (C) F<O<C<Li<Be
- (D) F<O<Be<C<Li
What is Silicon ?
- (A) metal
- (B) non-metal
- (C) metalloid
- (D) None of these
Which of the following is an electropositive element ?
- (A) C
- (B) Cl
- (C) Na
- (D) P
Tehri dam has been constructed in which state ?
- (A) Uttar Pradesh
- (B) Uttarakhand
- (C) Rajasthan
- (D) Bihar
Which of the following element is stored in Kerosene oil ?
- (A) Magnesium
- (B) Sodium
- (C) Mercury
- (D) Tungston
Which of the following is made from detergent.
- (A) Surf excel
- (B) Shampoo
- (C) Easy Surf
- (D) All of the above
Which is used in Solar Cell ?
- (A) Plastic
- (B) Silicon
- (C) Uranium
- (D) Plutonium
Which of the following is not used in cooking fuel ?
- (A) C.N.G.
- (B) L.P.G.
- (C) Biogas
- (D) Coal
2Cu + O2 -> 2CuO is -
- (A) Oxidation
- (B) Decomposition
- (C) Neutralization
- (D) Displacement
Which of the following is not a balanced equation ?
- (A) H2 + Cl2 -> 2HCl
- (B) Pb(NO3)2 -> PbO + NO2 + O2
- (C) 2H2 + O2 -> 2H2O
- (D) 2KClO3 -> 2KCl + 3O2
The pH value of a neutral solution is -
- (A) 7
- (B) 8
- (C) 6
- (D) 14
Which of the following is a weak acid ?
- (A) HNO3
- (B) HCl
- (C) CH3COOH
- (D) H2SO4
Cryolte is an ore of -
- (A) Copper
- (B) Iron
- (C) Magnesium
- (D) Aluminium
The atomic number of Potassium is -
- (A) 17
- (B) 18
- (C) 19
- (D) 20
The IUPAC name of formic acid is -
- (A) Methanoic acid
- (B) Propanoic acid
- (C) Ethanoic acid
- (D) None of these
Molecular formula of ethyl alcohol is -
- (A) CH3OH
- (B) C2H2OH
- (C) C2H5OH
- (D) C2H6OH
Which is alkyne ?
- (A) C2H2
- (B) C2H6
- (C) CH4
- (D) C2H4
Chemical formula of Sugar is -
- (A) C6H12O6
- (B) C12H22O11
- (C) CH3COOH
- (D) CH3CHO
The number of covalent bonds between carbon-carbon atoms in acetylene is -
- (A) 5
- (B) 7
- (C) 2
- (D) 3
Seeds used for the study of respiration are
- (A) Dry Seeds
- (B) Germinating Seeds
- (C) Boiled Seeds
- (D) Crushed Seeds
The kidneys in human beings are a part of which system ?
- (A) Nutrition
- (B) Respiration
- (C) Excretion
- (D) Transportation
The xylem in plants is responsible for the transportation of which of the following ?
- (A) Water
- (B) Food
- (C) Amino acid
- (D) Oxygen
Which gas is evolved during respiration ?
- (A) CO2
- (B) CO
- (C) N2
- (D) O2
Ripening of fruits is controlled by which of the following ?
- (A) Auxin
- (B) Gibberellin
- (C) Ethylene
- (D) Cytokinin
Part of the neuron where information acquired is - ?
- (A) Dendrite
- (B) Axon
- (C) Cell body
- (D) Nerve ending
Which of the following is Hormone of emergency ?
- (A) Adrenaline
- (B) Estrogen
- (C) Parathormone
- (D) Calcitonin
Which of the following is not an involuntary action ?
- (A) Vomiting
- (B) Salivation
- (C) Heart beat
- (D) Chewing
What is gestation period in human ?
- (A) 270 days
- (B) 290 days
- (C) 200 days
- (D) 245 days
When was Ganga action plan started ?
- (A) 1973
- (B) 1985
- (C) 1971
- (D) 1983
By budding, asexual reproduction occurs in which of the following ?
- (A) Yeast
- (B) Plasomodium
- (C) Amoeba
- (D) None of these
Which of the following diseases are related to respiratory system ?
- (A) Diarrhoea
- (B) Tuberculosis
- (C) Pneumonia
- (D) Both (B) and (C)
Which of the following is not digested by human being and other Carnivorous animals ?
- (A) Protein
- (B) Cellulose
- (C) Fat
- (D) All of these
Main reason of brain haemorrhage is
- (A) Hypotension
- (B) Heart attack
- (C) Hypertension
- (D) Paralysis
Which of the following is an example of Parasitic Plant ?
- (A) Bacteria
- (B) Cuscuta
- (C) Virus
- (D) Fungus
Blood is pumped to whole body from heart by
- (A) Lungs
- (B) Ventricle
- (C) Auricle
- (D) All of these
Asexual reproduction process in Hydra is -
- (A) Budding
- (B) Regeneration
- (C) Fission
- (D) Spore Formation
Sexually Transmitted Disease is -
- (A) Syphilis
- (B) AIDS
- (C) Gonorrhoea
- (D) All of the above
Outermost part of flower is
- (A) Sepal
- (B) Petal
- (C) Stamen
- (D) Pistil
Which antibody is found in blood group A -
- (A) 'a'
- (B) 'ab'
- (C) 'b'
- (D) 'O'
In blood, amount of glucose is not controlled by which of the following ?
- (A) Insulin
- (B) Glucagon
- (C) Gastrin
- (D) Somatostatin
Plant growth hormone is -
- (A) Gibberellins
- (B) Adrenaline
- (C) Insulin
- (D) Thyroxine
Hormones are secreted from
- (A) Endocrine gland
- (B) Exocrine gland
- (C) Tube
- (D) None of these
How many pairs of Salivary glands are found in human buccal cavity ?
- (A) One
- (B) Two
- (C) Three
- (D) Four
Androgen hormone is -
- (A) Male hormone
- (B) Female hormone
- (C) Digestive juice
- (D) Parathyroid hormone
Who selected pea as his experimental material ?
- (A) Mendal
- (B) Darwin
- (C) Lamarck
- (D) Khorana
Section B · Written questions (30)
Write the laws of Refraction of light.
The refractive indices of water and glass are 4/3 and 3/2 respectively. Find the speed of light in each of them.
Draw a ray diagram showing refraction of light through a prism.
What is fossil fuel? Give two examples.
What do you mean by electric potential?
Write the “Fleming’s left hand rule.”
On which factors does the resistance of a conductor depend ?
What is nuclear fission ?
धारावाही चालक के इर्द-गिर्द चुम्बकीय क्षेत्र उत्पन्न होता है। उसे दिखाने के लिए ऑस्टर्ड के प्रयोग का वर्णन करें।
दृष्टि दोष क्या है? यह कितने प्रकार के होते हैं, इसे कैसे ठीक किया जा सकता है ? सचित्र वर्णन करें।
संतुलित रासायनिक समीकरण क्या है? इसका एक उदाहरण दें।
सूचक क्या है? एक सूचक का नाम लिखें।
ऑक्सीकारक क्या है?
संक्षारण क्या है? सोदाहरण समझाएँ।
निम्नांकित समीकरणों को संतुलित करें। (i) BaCl2 + H2SO4 -> BaSO4 + HCl (ii) MnO2 + HCl -> MnCl2 + Cl2 + H2O
सहसंयोजन बंधन क्या है? दो उदाहरण दें।
अम्ल और भस्म में दो अंतर लिखें।
सजातीय श्रेणी क्या है? एक उदाहरण दें।
जस्ता के मुख्य अयस्क का नाम लिखें। जस्ता का उनके अयस्क से निष्कर्षण का वर्णन करें।
What do you understand about conservation and management of natural resources ?
What is fermentation? Where does it occur?
Differentiate between respiration and photosynthesis.
How does food reach inside the paramoecium ?
Why is nutrition essential for living beings ?
What is Villi? What is its function ?
Why Ethylene called 'ripening fruits' as phytohormone?
What is Phototropism ?
Define analogous organ with examples.
Explain the nervous system with well labelled diagram.
What is Pollination ? Explain with examples.
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