Dr. Homi Bhabha Exam sample question paper for Class 9 with our comprehensive set 1 is designed specifically for students following the Maharashtra State Board curriculum, aligning perfectly with the textbooks for 7th, 8th, and 9th standards. This sample question paper is designed to challenge students with in-depth, analytical questions from Maharashtra State Board, CBSE, ICSE, and IB textbooks, covering fundamental science concepts at a high difficulty level.
With questions set at a medium difficulty level, students can effectively enhance their understanding and confidence. Each question aims to challenge students while reinforcing their knowledge, making this resource invaluable preparing for DHBBVS.
Which of the following processes is a type of chemical change?
A) Melting of ice
B) Dissolving salt in water
C) Rusting of iron
D) Boiling water
Answer: C) Rusting of iron
Explanation: Rusting of iron is a chemical change as it forms a new substance, iron oxide.Which gas is most commonly found in Earth’s atmosphere?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon
Answer: B) Nitrogen
Explanation: Nitrogen makes up around 78% of Earth’s atmosphere.Which organ in the human body pumps blood to all parts of the body?
A) Brain
B) Heart
C) Lungs
D) Kidney
Answer: B) Heart
Explanation: The heart pumps blood, supplying oxygen and nutrients throughout the body.Which of the following can be classified as a decomposer?
A) Grasshopper
B) Fish
C) Fungi
D) Sparrow
Answer: C) Fungi
Explanation: Fungi are decomposers as they break down dead organic matter.
Which part of the plant is mainly responsible for photosynthesis?
A) Roots
B) Stems
C) Leaves
D) Flowers
Answer: C) Leaves
Explanation: Leaves contain chlorophyll, which captures sunlight to perform photosynthesis.What is the chemical formula of water?
A) H₂
B) O₂
C) H₂O
D) CO₂
Answer: C) H₂O
Explanation: Water is chemically represented by H₂O, indicating two hydrogen atoms and one oxygen atom.Which gas is produced when hydrochloric acid reacts with zinc?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
Answer: C) Hydrogen
Explanation: When hydrochloric acid reacts with zinc, hydrogen gas is released.Which of the following is a source of renewable energy?
A) Coal
B) Natural gas
C) Wind
D) Diesel
Answer: C) Wind
Explanation: Wind energy is renewable as it is naturally replenished.What type of mirror is used in vehicles as rearview mirrors?
A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Spherical mirror
Answer: B) Convex mirror
Explanation: Convex mirrors provide a wider field of view, helpful for rear visibility in vehicles.Which vitamin is produced in the skin in response to sunlight?
A) Vitamin A
B) Vitamin C
C) Vitamin D
D) Vitamin B
Answer: C) Vitamin D
Explanation: Sunlight triggers the production of Vitamin D in the skin.What is the primary function of red blood cells?
A) Fight infections
B) Transport oxygen
C) Clot blood
D) Produce enzymes
Answer: B) Transport oxygen
Explanation: Red blood cells contain hemoglobin, which binds and transports oxygen.Which process in plants releases oxygen as a byproduct?
A) Respiration
B) Transpiration
C) Photosynthesis
D) Germination
Answer: C) Photosynthesis
Explanation: Photosynthesis in plants produces oxygen as a byproduct.
Which law of motion states that “for every action, there is an equal and opposite reaction”?
A) Newton’s First Law
B) Newton’s Third Law
C) Newton’s Second Law
D) Law of conservation of energy
Answer: B) Newton’s Third Law
Explanation: Newton’s Third Law states that every action has an equal and opposite reaction.Which cell organelle is known as the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Lysosome
Answer: C) Mitochondria
Explanation: Mitochondria generate energy (ATP) for cellular functions.The atomic number of an element represents the number of:
A) Protons only
B) Electrons only
C) Protons and electrons
D) Neutrons only
Answer: C) Protons and electrons
Explanation: The atomic number equals the number of protons, and in a neutral atom, also the number of electrons.What is the formula of methane?
A) C₂H₆
B) CH₄
C) CO₂
D) H₂O
Answer: B) CH₄
Explanation: Methane is CH₄, containing one carbon atom bonded to four hydrogen atoms.Which part of the human brain controls voluntary actions?
A) Cerebellum
B) Cerebrum
C) Medulla
D) Hypothalamus
Answer: B) Cerebrum
Explanation: The cerebrum controls voluntary actions, such as movement and speech.What is the unit of electric current?
A) Volt
B) Watt
C) Ampere
D) Ohm
Answer: C) Ampere
Explanation: Current is measured in amperes, representing the flow of electric charge per unit time.Which planet is known as the “Blue Planet”?
A) Mars
B) Venus
C) Earth
D) Jupiter
Answer: C) Earth
Explanation: Earth is called the Blue Planet due to its large water bodies, making it appear blue from space.What is the function of stomata in plants?
A) Transport water
B) Exchange gases
C) Absorb sunlight
D) Store food
Answer: B) Exchange gases
Explanation: Stomata are small openings on leaves that facilitate gas exchange.Which substance has a pH level below 7?
A) Water
B) Vinegar
C) Soap
D) Baking soda
Answer: B) Vinegar
Explanation: Vinegar is acidic with a pH below 7.Which of the following has the highest frequency?
A) Radio waves
B) Microwaves
C) Gamma rays
D) Infrared
Answer: C) Gamma rays
Explanation: Gamma rays have the highest frequency and the shortest wavelength in the electromagnetic spectrum.The unit of force is:
A) Watt
B) Joule
C) Newton
D) Pascal
Answer: C) Newton
Explanation: Force is measured in newtons, defined as the product of mass and acceleration.Which gas is essential for combustion?
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Helium
Answer: B) Oxygen
Explanation: Oxygen supports combustion and is essential for burning.What is the main cause of tides on Earth?
A) Earth’s rotation
B) Sun’s gravitational pull
C) Moon’s gravitational pull
D) Wind
Answer: C) Moon’s gravitational pull
Explanation: The gravitational pull of the moon causes the rise and fall of ocean tides.Which organ is primarily responsible for detoxification in the human body?
A) Heart
B) Liver
C) Lungs
D) Kidneys
Answer: B) Liver
Explanation: The liver detoxifies chemicals and metabolizes drugs.Which is the SI unit of work?
A) Pascal
B) Joule
C) Watt
D) Newton
Answer: B) Joule
Explanation: Work is measured in joules, which equals one newton meter.Which of the following has the largest atomic size?
A) Fluorine
B) Oxygen
C) Potassium
D) Carbon
Answer: C) Potassium
Explanation: Potassium, being further down the periodic table, has a larger atomic radius.
Who is known as the father of modern physics?
A) Albert Einstein
B) Galileo Galilei
C) Isaac Newton
D) Niels Bohr
Answer: A) Albert Einstein
Explanation: Galileo is often regarded as the father of modern physics for his contributions to motion and observational astronomy.Which metal is liquid at room temperature?
A) Iron
B) Mercury
C) Silver
D) Lead
Answer: B) Mercury
Explanation: Mercury is the only metal that remains liquid at room temperature.Which scientist developed the periodic table?
A) Isaac Newton
B) Dmitri Mendeleev
C) Albert Einstein
D) Nikola Tesla
Answer: B) Dmitri Mendeleev
Explanation: Dmitri Mendeleev created the first periodic table of elements.Which element is found in diamonds?
A) Silicon
B) Oxygen
C) Carbon
D) Iron
Answer: C) Carbon
Explanation: Diamonds are composed purely of carbon atoms.Who proposed the theory of relativity?
A) Galileo Galilei
B) Albert Einstein
C) Niels Bohr
D) James Clerk Maxwell
Answer: B) Albert Einstein
Explanation: Albert Einstein developed the theory of relativity, which includes the famous equation E=mc².Which planet has the shortest day, completing a rotation on its axis in about 10 hours?
A) Earth
B) Venus
C) Jupiter
D) Mars
Answer: C) Jupiter
Explanation: Jupiter has the shortest day, completing one rotation in approximately 10 hours.What is the main gas found in the air exhaled by humans?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
Answer: B) Carbon dioxide
Explanation: Exhaled air has a higher concentration of carbon dioxide than inhaled air due to respiration.Who is credited with the discovery of penicillin?
A) Alexander Fleming
B) Louis Pasteur
C) Joseph Lister
D) Robert Koch
Answer: A) Alexander Fleming
Explanation: Alexander Fleming discovered penicillin in 1928, revolutionizing the treatment of bacterial infections.What does DNA stand for?
A) Deoxynucleotide acid
B) Deoxyribose nucleic acid
C) Deoxyribonucleic acid
D) Deoxyribonucleotide acid
Answer: C) Deoxyribonucleic acid
Explanation: DNA stands for Deoxyribonucleic Acid, which contains genetic information in living organisms.Which gas is known as a noble gas?
A) Oxygen
B) Argon
C) Nitrogen
D) Hydrogen
Answer: B) Argon
Explanation: Argon is one of the noble gases, known for its lack of chemical reactivity.Which element has the highest melting point?
A) Iron
B) Tungsten
C) Gold
D) Silver
Answer: B) Tungsten
Explanation: Tungsten has the highest melting point of all elements, used in applications requiring extreme heat.What is the main component of the sun?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Answer: D) Hydrogen
Explanation: The sun is primarily composed of hydrogen, which fuels the nuclear fusion process to emit energy.
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