Dr. Homi Bhabha Exam sample question paper for Class 9 with our comprehensive set 10 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.
1. Which organelle is known as the “powerhouse of the cell”?
a) Nucleus
b) Chloroplast
c) Mitochondria
d) Ribosome
Answer: c) Mitochondria
Explanation: Mitochondria generate energy in the form of ATP, hence they are called the powerhouse of the cell.
2. What is the SI unit of force?
a) Joule
b) Newton
c) Pascal
d) Watt
Answer: b) Newton
Explanation: The SI unit of force is Newton (N), named after Sir Isaac Newton.
3. What is the chemical formula for common salt?
a) HCl
b) NaCl
c) KCl
d) MgCl₂
Answer: b) NaCl
Explanation: Common salt is sodium chloride, represented by the chemical formula NaCl.
4. Which part of a plant is responsible for photosynthesis?
a) Roots
b) Stem
c) Leaves
d) Flowers
Answer: c) Leaves
Explanation: Leaves contain chlorophyll in chloroplasts, which trap sunlight for photosynthesis.
5. Which gas is evolved when a metal reacts with an acid?
a) Oxygen
b) Carbon dioxide
c) Hydrogen
d) Nitrogen
Answer: c) Hydrogen
Explanation: Metals react with acids to produce hydrogen gas and a salt.
6. Which planet has the most moons in the solar system?
a) Jupiter
b) Saturn
c) Uranus
d) Neptune
Answer: b) Saturn
Explanation: Saturn has the highest number of moons in the solar system as of recent discoveries.
7. What is the primary component of biogas?
a) Ethane
b) Methane
c) Propane
d) Butane
Answer: b) Methane
Explanation: Biogas consists mainly of methane, which is a renewable energy source.
8. What is the main purpose of the ozone layer?
a) To trap heat
b) To provide oxygen
c) To protect against UV radiation
d) To balance pressure
Answer: c) To protect against UV radiation
Explanation: The ozone layer absorbs harmful ultraviolet rays from the Sun.
9. Which vitamin is known as the “sunshine vitamin”?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
Answer: d) Vitamin D
Explanation: Vitamin D is synthesized in the skin when exposed to sunlight.
10. What is the process of water moving through a plant called?
a) Photosynthesis
b) Transpiration
c) Respiration
d) Germination
Answer: b) Transpiration
Explanation: Transpiration is the movement of water from roots to leaves and its evaporation.
11. What is the most abundant gas in Earth’s atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
Answer: c) Nitrogen
Explanation: Nitrogen makes up about 78% of Earth’s atmosphere.
12. What is the pH value of pure water?
a) 5
b) 6
c) 7
d) 8
Answer: c) 7
Explanation: Pure water is neutral with a pH of 7.
13. Which law states that energy can neither be created nor destroyed?
a) Newton’s First Law
b) Law of Conservation of Energy
c) Pascal’s Law
d) Archimedes’ Principle
Answer: b) Law of Conservation of Energy
Explanation: This law asserts that the total energy of an isolated system remains constant.
14. What is the chemical name for quicklime?
a) Calcium carbonate
b) Calcium oxide
c) Calcium hydroxide
d) Magnesium oxide
Answer: b) Calcium oxide
Explanation: Quicklime is chemically calcium oxide (CaO).
15. Which blood cells help in clotting?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
Answer: c) Platelets
Explanation: Platelets are responsible for blood clotting to prevent bleeding.
16. Which phenomenon explains the splitting of white light into colors?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion
Answer: d) Dispersion
Explanation: Dispersion occurs when white light passes through a prism, separating into colors.
17. What is the SI unit of electric current?
a) Ampere
b) Volt
c) Watt
d) Ohm
Answer: a) Ampere
Explanation: Electric current is measured in amperes (A).
18. Which is the simplest hydrocarbon?
a) Ethane
b) Methane
c) Propane
d) Butane
Answer: b) Methane
Explanation: Methane (CH₄) is the simplest hydrocarbon, consisting of one carbon atom and four hydrogen atoms.
19. What is the cause of tides on Earth?
a) Wind currents
b) Sun’s heat
c) Moon’s gravitational pull
d) Earth’s rotation
Answer: c) Moon’s gravitational pull
Explanation: Tides are primarily caused by the gravitational pull of the Moon on Earth’s oceans.
20. What is the primary pigment involved in photosynthesis?
a) Hemoglobin
b) Chlorophyll
c) Melanin
d) Carotene
Answer: b) Chlorophyll
Explanation: Chlorophyll absorbs sunlight and plays a key role in photosynthesis.
21. Which organ in the human body is responsible for filtering blood?
a) Liver
b) Heart
c) Kidney
d) Lungs
Answer: c) Kidney
Explanation: Kidneys filter blood to remove waste and excess fluids, forming urine.
22. What is the main reason for the blue color of the sky?
a) Reflection of sunlight
b) Scattering of sunlight
c) Refraction of light
d) Absorption of blue light
Answer: b) Scattering of sunlight
Explanation: The blue color is due to Rayleigh scattering, where shorter wavelengths scatter more.
23. Which of the following is not a physical change?
a) Melting of ice
b) Boiling of water
c) Rusting of iron
d) Dissolving salt in water
Answer: c) Rusting of iron
Explanation: Rusting of iron is a chemical change as it forms a new substance (iron oxide).
24. What is the main function of stomata in plants?
a) Photosynthesis
b) Respiration
c) Transpiration
d) Absorption of nutrients
Answer: c) Transpiration
Explanation: Stomata regulate the loss of water through transpiration and allow gas exchange.
25. What is the speed of light in a vacuum?
a) 3 × 10⁵ m/s
b) 3 × 10⁶ m/s
c) 3 × 10⁷ m/s
d) 3 × 10⁸ m/s
Answer: d) 3 × 10⁸ m/s
Explanation: The speed of light in a vacuum is approximately 3 × 10⁸ meters per second.
26. What is the chemical formula for limewater?
a) CaCO₃
b) Ca(OH)₂
c) CaO
d) CaCl₂
Answer: b) Ca(OH)₂
Explanation: Limewater is a dilute solution of calcium hydroxide, Ca(OH)₂.
27. Which blood group is considered a universal donor?
a) A
b) B
c) AB
d) O
Answer: d) O
Explanation: Blood group O can be donated to any other blood type, making it a universal donor.
28. What does DNA stand for?
a) Deoxynucleic Acid
b) Deoxyribonucleic Acid
c) Dextroribonucleic Acid
d) Dinucleic Acid
Answer: b) Deoxyribonucleic Acid
Explanation: DNA, or Deoxyribonucleic Acid, carries genetic instructions in living organisms.
29. What is the unit of work in the SI system?
a) Joule
b) Watt
c) Newton
d) Pascal
Answer: a) Joule
Explanation: Work is measured in Joules (J), which is the product of force and displacement.
30. What is the term for the uppermost layer of Earth’s atmosphere?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: d) Exosphere
Explanation: The exosphere is the outermost layer, where the atmosphere transitions into space.
31. What is the term for organisms that can prepare their own food?
a) Parasites
b) Heterotrophs
c) Saprophytes
d) Autotrophs
Answer: d) Autotrophs
Explanation: Autotrophs, like plants, synthesize their own food through photosynthesis.
32. Which instrument is used to measure atmospheric pressure?
a) Barometer
b) Thermometer
c) Hygrometer
d) Anemometer
Answer: a) Barometer
Explanation: A barometer measures atmospheric pressure and helps in weather forecasting.
33. What is the function of white blood cells (WBCs)?
a) Transport oxygen
b) Aid in clotting
c) Fight infections
d) Regulate body temperature
Answer: c) Fight infections
Explanation: WBCs are part of the immune system and protect the body from infections.
34. What is the product of anaerobic respiration in yeast?
a) Water
b) Lactic acid
c) Ethanol
d) Glucose
Answer: c) Ethanol
Explanation: Yeast produces ethanol and carbon dioxide during anaerobic respiration.
35. What type of mirror is used in a car’s side mirror?
a) Plane mirror
b) Concave mirror
c) Convex mirror
d) Parabolic mirror
Answer: c) Convex mirror
Explanation: Convex mirrors provide a wider field of view, making them suitable for vehicles.
36. Which gas is the most abundant in the Sun?
a) Oxygen
b) Helium
c) Hydrogen
d) Nitrogen
Answer: c) Hydrogen
Explanation: The Sun primarily consists of hydrogen, which undergoes nuclear fusion to form helium.
37. What is the unit of measurement for sound intensity?
a) Newton
b) Joule
c) Decibel
d) Pascal
Answer: c) Decibel
Explanation: Decibel (dB) is the unit for measuring the intensity of sound.
38. What is the lightest element in the periodic table?
a) Hydrogen
b) Helium
c) Lithium
d) Carbon
Answer: a) Hydrogen
Explanation: Hydrogen, with an atomic number of 1, is the lightest element.
39. Which gas is commonly used in balloons?
a) Helium
b) Oxygen
c) Carbon dioxide
d) Hydrogen
Answer: a) Helium
Explanation: Helium is lightweight, non-flammable, and safe for use in balloons.
40. Who invented the periodic table?
a) Isaac Newton
b) Dmitri Mendeleev
c) Marie Curie
d) Ernest Rutherford
Answer: b) Dmitri Mendeleev
Explanation: Dmitri Mendeleev organized elements into the periodic table based on atomic weights and properties.
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