Bihar Board Class 10 Science Question Paper 2025 (Code 112 Set-E) Available- Download Here with Solution PDF

Double circulation is not found in

• (A) Frog
• (B) Fish
• (C) Bird
• (D) Human

From where does urea enter the blood ?

• (A) Kidney
• (B) Lungs
• (C) Liver
• (D) None of these

Where does glucose reabsorption occur?

• (A) In PCT
• (B) In DCT
• (C) In Henle's loop
• (D) All of these

The mechanism for removing harmful substances formed as a result of various activities from the body is called

• (A) Digestive system
• (B) Circulatory system
• (C) Excretory system
• (D) Nervous system

What can happen due to spinal cord injury?

• (A) Goitre
• (B) Dwarfism
• (C) Diabetes
• (D) Paralysis

The largest gland in the human body is

• (A) Adrenal
• (B) Liver
• (C) Ovary
• (D) Pancreas

Plant hormone is called

• (A) Pheromone
• (B) Phytohormone
• (C) Enzyme
• (D) None of these

An example of vegetative propagation through leaves is

• (A) Onion
• (B) Potato
• (C) Rose
• (D) Bryophyllum

How many isomers of butane are possible ?

• (A) 2
• (B) 3
• (C) 4
• (D) 5

The shape of methane molecule is

• (A) Linear
• (B) Annular
• (C) Tetrahedral
• (D) Octahedral

The valency of carbon in organic compounds is

• (A) 1
• (B) 2
• (C) 3
• (D) 4

Which of the following is saturated hydrocarbon ?

• (A) Alkane
• (B) Alkene
• (C) Alkyne
• (D) None of these

IUPAC name of ethylene is

• (A) Ethane
• (B) Ethyne
• (C) Ethene
• (D) None of these

Which was a defect of Mendeleev's periodic table ?

• (A) Not giving proper place to oxygen
• (B) Not giving proper place to Cl
• (C) Not giving proper place to hydrogen
• (D) None of these

Who among the following propounded the laws of octave ?

• (A) Mendeleev
• (B) Newlands
• (C) Lother Meyer
• (D) Dobereiner

Which of the following compounds would be the most basic ?

• (A) \(SO_2\)
• (B) \(Na_2O\)
• (C) \(Al_2O_3\)
• (D) \(NO_2\)

A group of rays is called

• (A) Light beam
• (B) Ray beam
• (C) Both (A) and (B)
• (D) None of these

The light rays travel in

• (A) any direction
• (B) oblique line
• (C) a straight line
• (D) none of these

Which type of mirror is a concave mirror ?

• (A) Divergent
• (B) Convergent
• (C) Both convergent and divergent
• (D) None of these

Which of the following types of mirror is used in the headlight of a car ?

• (A) Convex mirror
• (B) Concave mirror
• (C) Plane mirror
• (D) None of these

The focal length of a concave mirror is

• (A) Positive
• (B) Negative
• (C) both (A) and (B)
• (D) None of these

Which mirror always forms an image smaller than the object?

• (A) Concave
• (B) Plane
• (C) Convex
• (D) None of these

The speed of light in air as compared to vacuum is

• (A) Less
• (B) More
• (C) Same
• (D) None of these

Which phenomenon exhibited by light is demonstrated in the twinkling of stars ?

• (A) Reflection
• (B) Dispersion
• (C) Scattering
• (D) Refraction

An aqueous solution of an acid conducts electricity because acid in water

• (A) gets ionized
• (B) is soluble
• (C) is insoluble
• (D) none of these

Which of the following is not an olfactory indicator ?

• (A) Clove oil
• (B) Vanilla
• (C) Sweet potato
• (D) All of these

Which acid is found in ant sting?

• (A) Citric acid
• (B) Acetic acid
• (C) Methanoic acid
• (D) None of these

Which of the following is kept immersed in water ?

• (A) White phosphorus
• (B) Red phosphorus
• (C) Iodine
• (D) Sulphur

The substances, present as impurities in on ore, are called

• (A) Slag
• (B) Gangue
• (C) Mineral
• (D) None of these

Which of the following metals can be easily cut with a knife ?

• (A) Na
• (B) Cu
• (C) Ni
• (D) Al

Which metal is mixed with gold to make an alloy ?

• (A) Fe
• (B) Cu
• (C) Zn
• (D) Ag

Silicon is a/an

• (A) Non-metal
• (B) Metal
• (C) Alloy
• (D) Metalloid

A horizontal magnet hanging freely in air always comes to rest in

• (A) Any direction
• (B) East-West direction
• (C) North-South direction
• (D) None of these

If a compass is placed near a wire carrying electric current, the compass needle

• (A) Will be deflected
• (B) The current carrying wire will be deflected
• (C) Will not be deflected
• (D) None of these

Faraday made many revolutionary discoveries, including

• (A) Electromagnetic induction
• (B) Law of electrolysis
• (C) Both (A) and (B)
• (D) None of these

An electric motor converts

• (A) Chemical energy into electrical energy
• (B) Electrical energy into mechanical energy
• (C) Mechanical energy into electrical energy
• (D) Electrical energy into chemical energy

In Fleming's left-hand rule, the index finger of the left hand indicates

• (A) Direction of magnetic field
• (B) Direction of electric force applied on the conductor
• (C) Direction of electric current flowing in the conductor
• (D) None of these

When electric current flows through a conducting wire, what type of magnetic field is generated above and below the wire ?

• (A) Opposite type
• (B) Similar type
• (C) Not of any kind
• (D) None of these

What type of energy source is hydroelectric energy ?

• (A) Renewable
• (B) Non-renewable
• (C) Both (A) and (B)
• (D) None of these

Which gas is responsible for global warming?

• (A) Nitrogen
• (B) Carbon dioxide
• (C) Oxygen
• (D) None of these

Magnesium is a member of which group of the periodic table ?

• (A) Group VIII
• (B) Group I
• (C) Group II
• (D) Nonmetallic element

How many periods are there in the periodic table ?

• (A) 12
• (B) 9
• (C) 8
• (D) 7

Which of the following is not an ancient method of water harvesting?

• (A) Katta
• (B) Kulh
• (C) Dug well
• (D) Irish

What was the objective of construction of Tehri Dam ?

• (A) Electricity generation
• (B) Land irrigation
• (C) Water supply
• (D) All of these

What is the new concept of waste management ?

• (A) Reuse
• (B) Recycle
• (C) Reduce
• (D) All of these

Which of the following is a renewable resource ?

• (A) Coal
• (B) Forest
• (C) Petroleum
• (D) None of these

Which of the following is the main component of biogas ?

• (A) Carbon dioxide
• (B) Hydrogen sulphide
• (C) Water vapour
• (D) Methane

Peptic ulcer can be caused by

• (A) Eating less food
• (B) Eating normal food
• (C) Prolonged starvation
• (D) None of these

Bile juice is secreted by

• (A) Oral cavity
• (B) Liver
• (C) Small intestine
• (D) Stomach

What is the function of the villi located in small intestine ?

• (A) Blocking absorption
• (B) Reducing the surface area of absorption
• (C) Increasing the surface area of absorption
• (D) None of these

The posterior part of the oral cavity is

• (A) Esophagus
• (B) Pharynx
• (C) Duodenum
• (D) Pancreas

The transfer of \(O_2\) from outside environment to cells and removal of \(CO_2\) is referred to as

• (A) Exhalation
• (B) Respiration
• (C) Inhalation
• (D) None of these

The basic source of oxygen in photosynthesis is

• (A) Chlorophyll
• (B) \(CO_2\)
• (C) Water
• (D) Solar energy

Which of the following is known as the 'energy currency' of the cell?

• (A) ATP
• (B) ADP
• (C) DTP
• (D) None of these

Xylem in plant is responsible for

• (A) Carrying of food
• (B) Carrying of oxygen
• (C) Carrying of amino acid
• (D) Carrying of water

Apart from plasma, which of the following is found in blood ?

• (A) White Blood Cells (WBC)
• (B) Red Blood Cells (RBC)
• (C) Blood platelets
• (D) All of these

(The changes that occur during adolescence are called)

• (A) Diversity
• (B) Germination
• (C) Puberty
• (D) None of these

Which of the following is an effective measure used in family planning?

• (A) Diaphragm
• (B) Condom
• (C) Copper T and loop
• (D) All of these

What is the meaning of atavism ?

• (A) Inheritance of parental characteristics in progeny
• (B) No inheritance of parental characteristics in progeny
• (C) Inheritance of ancestral characteristics in progeny, which are not in parents
• (D) All of these

The genetic structure of an organism is called

• (A) Phenotype
• (B) Genotype
• (C) Heredity
• (D) Diversity

The evolution of organisms by natural selection is called

• (A) Mendelism
• (B) Lamarckism
• (C) Micro-development
• (D) Darwinism

The chemical which shows biomagnification is

• (A) CFC
• (B) ADP
• (C) ATP
• (D) DDT

Primary consumers are called

• (A) Decomposer
• (B) Omnivorous
• (C) Carnivorous
• (D) Vegetarian

CFC is widely used in

• (A) Jet engines
• (B) Refrigerators
• (C) Air conditioners
• (D) All of these

If the focal length of the lens is f and power is P then

• (A) \(f + P = 0.5\)
• (B) \(f \times P = 1\)
• (C) \(P + f = 1\)
• (D) \(P + f = 2\)

Which part of camera acts like the retina of the eye ?

• (A) Aperture
• (B) Lens
• (C) Film
• (D) Shutter

For a healthy human eye, the near point and far point are respectively

• (A) 0 and infinity
• (B) 25 cm and 250 cm
• (C) 25 cm and infinity
• (D) 0 and 25 cm

To an astronaut standing on the moon, the sky appears to be

• (A) Red
• (B) Blue
• (C) Black
• (D) White

The decreased accommodative ability of the eye causes

• (A) Farsightedness
• (B) Presbyopia
• (C) Nearsightedness
• (D) Colourblindness

The unit of resistivity in a conductor is

• (A) \(\Omega\) m
• (B) \(\Omega\)/m
• (C) \(\Omega^{-1}\)
• (D) None of these

How many calories are there in 1 joule ?

• (A) 0.23
• (B) 0.19
• (C) 0.21
• (D) 0.25

The filament in an electric bulb is made of which of the following metals?

• (A) Iron
• (B) Aluminium
• (C) Tungsten
• (D) Copper

In which state is the Kalpakkam Nuclear Power Plant located ?

• (A) Karnataka
• (B) Tamil Nadu
• (C) Uttar Pradesh
• (D) Gujarat

The main component of domestic gas (LPG) is

• (A) Ethane
• (B) Propane
• (C) Butane
• (D) Methane

The two non-renewable sources of energy are

• (A) Gobar gas and biomass
• (B) Coal and petroleum
• (C) Biomass and petroleum
• (D) None of these

Which type of reaction is respiration ?

• (A) Combination
• (B) Reduction
• (C) Endothermic
• (D) Oxidation

Compounds formed by transfer of electrons are called

• (A) Organic
• (B) Covalent
• (C) Electrovalent
• (D) None of these

Which of the following reactions is an example of decomposition reaction ?

• (A) \(H_2 + I_2 \rightarrow 2HI\)
• (B) \(NH_4CNO \rightarrow H_2NCONH_2\)
• (C) \(NaOH + HCl \rightarrow NaCl + H_2O\)
• (D) \(2KClO_3 \rightarrow 2KCl + 3O_2\)

In which of the following is tartaric acid found ?

• (A) Orange
• (B) Tamarind
• (C) Tomato
• (D) Vinegar

What is the chemical name of slaked lime ?

• (A) Calcium oxychloride
• (B) Calcium chloride
• (C) Calcium oxide
• (D) Calcium hydroxide

Why do planets not twinkle ? Explain.

What is called absolute refractive index ?

What is farsightedness ?

What do you understand by electromagnetic induction ?

Why is inert gas filled in electric bulb ?

What do you understand by potential difference ?

What is called the best source of energy ?

What is dynamo ? What is its use ?

What are defects of vision ? What are their types ? How are the defects resolved ?

Describe the structure and working method of a biogas plant.

Write three information obtained from chemical equation.

Why is an aqueous solution of sodium carbonate alkaline ?

What is an indicator ? Write the name of an indicator.

What is the difference between an atom and an ion ?

Define ores.

Why have detergents replaced soap ?

What are fossil fuels ?

What do you understand by short and long periods of periodic table ?

Differentiate between metals and non-metals on the basis of physical and chemical properties.

What is energy crisis ? Mention the measures to resolve it.

Write the names of four organelles of a cell.

Define respiration.

What is the difference between xylem and phloem ?

What is excretion ? Write the names of its two main parts.

What is phototropism ?

What is pollination ?

How is DNA the basis of heredity ?

What are the harmful effects of aerosol chemicals ?

What is photosynthesis ? Describe it with a suitable diagram.

Explain recycling of waste materials with examples.