Dr. Homi Bhabha Exam sample question paper for Class 9 with our comprehensive set 11 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. What is the SI unit of temperature?
a) Fahrenheit
b) Celsius
c) Kelvin
d) Joule
Answer: c) Kelvin
Explanation: The SI unit of temperature is Kelvin, which is the standard unit used in scientific measurements.
2. Which of the following is an example of a unicellular organism?
a) Amoeba
b) Frog
c) Mango tree
d) Earthworm
Answer: a) Amoeba
Explanation: Amoeba is a single-celled organism capable of independent life functions.
3. What is the main function of xylem in plants?
a) Transporting food
b) Transporting water
c) Photosynthesis
d) Reproduction
Answer: b) Transporting water
Explanation: Xylem carries water and minerals from roots to other parts of the plant.
4. What is the formula for force according to Newton’s second law?
a) Force = Mass × Velocity
b) Force = Mass × Acceleration
c) Force = Acceleration / Mass
d) Force = Mass / Acceleration
Answer: b) Force = Mass × Acceleration
Explanation: Newton’s second law states that force is the product of mass and acceleration.
5. What is the function of chloroplasts in plant cells?
a) Storage of food
b) Photosynthesis
c) Respiration
d) Protein synthesis
Answer: b) Photosynthesis
Explanation: Chloroplasts contain chlorophyll, which traps sunlight for photosynthesis.
6. Which of the following is an example of a physical change?
a) Burning of paper
b) Rusting of iron
c) Melting of ice
d) Cooking of food
Answer: c) Melting of ice
Explanation: Melting of ice is a physical change as no new substance is formed.
7. Which type of energy conversion occurs in a hydroelectric power plant?
a) Chemical to electrical
b) Potential to electrical
c) Kinetic to electrical
d) Solar to electrical
Answer: c) Kinetic to electrical
Explanation: Moving water (kinetic energy) is converted into electricity in hydroelectric power plants.
8. What is the chemical symbol for Sodium?
a) Na
b) S
c) So
d) Sn
Answer: a) Na
Explanation: Sodium is represented by the symbol Na, derived from its Latin name, Natrium.
9. Which planet is known as the “Red Planet”?
a) Earth
b) Mars
c) Venus
d) Jupiter
Answer: b) Mars
Explanation: Mars appears red due to the presence of iron oxide (rust) on its surface.
10. Which gas is most abundant in the Earth’s atmosphere?
a) Oxygen
b) Carbon Dioxide
c) Nitrogen
d) Argon
Answer: c) Nitrogen
Explanation: About 78% of the Earth’s atmosphere is nitrogen.
11. What is the primary function of the large intestine?
a) Digestion of food
b) Absorption of water
c) Production of enzymes
d) Absorption of nutrients
Answer: b) Absorption of water
Explanation: The large intestine absorbs water and forms solid waste.
12. What type of reaction is represented by the equation: HCl + NaOH → NaCl + H₂O?
a) Combustion
b) Neutralization
c) Displacement
d) Synthesis
Answer: b) Neutralization
Explanation: This is a neutralization reaction between an acid and a base to form salt and water.
13. Which of the following laws explains the relationship between pressure and volume of a gas?
a) Boyle’s Law
b) Charles’ Law
c) Avogadro’s Law
d) Pascal’s Law
Answer: a) Boyle’s Law
Explanation: Boyle’s Law states that pressure and volume are inversely proportional at constant temperature.
14. What is the primary cause of day and night?
a) Revolution of the Earth
b) Rotation of the Earth
c) Tilt of the Earth’s axis
d) Position of the Moon
Answer: b) Rotation of the Earth
Explanation: The Earth’s rotation on its axis causes the cycle of day and night.
15. Which vitamin helps in the clotting of blood?
a) Vitamin A
b) Vitamin C
c) Vitamin K
d) Vitamin D
Answer: c) Vitamin K
Explanation: Vitamin K is essential for the synthesis of proteins involved in blood clotting.
16. What is the chemical formula of baking soda?
a) NaCl
b) NaHCO₃
c) K₂CO₃
d) Na₂SO₄
Answer: b) NaHCO₃
Explanation: Baking soda is sodium bicarbonate, NaHCO₃.
17. Which part of the human brain controls balance and coordination?
a) Cerebrum
b) Cerebellum
c) Medulla
d) Hypothalamus
Answer: b) Cerebellum
Explanation: The cerebellum is responsible for maintaining balance and coordinating movements.
18. Which organelle is known as the powerhouse of the cell?
a) Nucleus
b) Mitochondria
c) Ribosome
d) Endoplasmic Reticulum
Answer: b) Mitochondria
Explanation: Mitochondria produce energy in the form of ATP through cellular respiration, hence called the powerhouse of the cell.
19. Which type of mirror is used in the headlights of vehicles?
a) Plane mirror
b) Convex mirror
c) Concave mirror
d) None of the above
Answer: c) Concave mirror
Explanation: Concave mirrors focus light into a beam, making them ideal for vehicle headlights.
20. What is the valency of carbon in methane (CH₄)?
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
Explanation: Carbon shares four electrons with hydrogen in methane, giving it a valency of 4.
21. Which of the following is not a chemical reaction?
a) Rusting of iron
b) Melting of ice
c) Burning of wood
d) Digestion of food
Answer: b) Melting of ice
Explanation: Melting of ice is a physical change, as it only changes the state, not the composition.
22. What is the unit of electric current?
a) Watt
b) Volt
c) Ohm
d) Ampere
Answer: d) Ampere
Explanation: The SI unit of electric current is the ampere (A).
23. In humans, which blood group is known as the universal donor?
a) A
b) B
c) AB
d) O
Answer: d) O
Explanation: Blood group O can be donated to individuals of any other blood group due to the absence of antigens on its red blood cells.
24. What is the charge of an electron?
a) Positive
b) Neutral
c) Negative
d) None of the above
Answer: c) Negative
Explanation: Electrons carry a negative charge and are found outside the nucleus of an atom.
25. Which gas is released during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b) Oxygen
Explanation: During photosynthesis, oxygen is released as a byproduct when plants convert carbon dioxide and water into glucose.
26. The phenomenon of splitting of white light into its component colors is called what?
a) Reflection
b) Refraction
c) Dispersion
d) Diffraction
Answer: c) Dispersion
Explanation: Dispersion occurs when white light passes through a prism and splits into its component colors.
27. Which part of the eye controls the amount of light entering it?
a) Retina
b) Lens
c) Cornea
d) Iris
Answer: d) Iris
Explanation: The iris adjusts the size of the pupil to control the amount of light entering the eye.
28. What is the role of hemoglobin in the human body?
a) Digestion
b) Oxygen transport
c) Hormone production
d) Immune response
Answer: b) Oxygen transport
Explanation: Hemoglobin in red blood cells binds to oxygen and transports it to tissues.
29. Which acid is present in vinegar?
a) Sulfuric acid
b) Acetic acid
c) Hydrochloric acid
d) Citric acid
Answer: b) Acetic acid
Explanation: Vinegar contains acetic acid, which gives it its sour taste.
30. What is the pH of pure water at 25°C?
a) 5
b) 7
c) 9
d) 14
Answer: b) 7
Explanation: Pure water is neutral with a pH of 7 at 25°C.
31. Which process is responsible for the removal of nitrogenous waste from the human body?
a) Digestion
b) Respiration
c) Excretion
d) Circulation
Answer: c) Excretion
Explanation: The kidneys excrete nitrogenous waste like urea through urine, a process called excretion.
32. What is the chemical formula of quicklime?
a) CaO
b) CaCO₃
c) MgO
d) CaCl₂
Answer: a) CaO
Explanation: Quicklime is calcium oxide (CaO), a compound used in construction and industry.
33. Which law explains the reflection of light?
a) Newton’s First Law
b) Law of Conservation of Energy
c) Snell’s Law
d) Laws of Reflection
Answer: d) Laws of Reflection
Explanation: The laws of reflection state that the angle of incidence equals the angle of reflection.
34. Which part of the human brain regulates body temperature?
a) Cerebrum
b) Cerebellum
c) Hypothalamus
d) Medulla
Answer: c) Hypothalamus
Explanation: The hypothalamus regulates body temperature and other homeostatic processes.
35. What is the molecular formula of ozone?
a) O₂
b) O₃
c) O₄
d) O₆
Answer: b) O₃
Explanation: Ozone is a triatomic molecule of oxygen with the molecular formula O₃.
36. What is the primary purpose of stomata in plants?
a) Absorption of nutrients
b) Photosynthesis
c) Gaseous exchange
d) Transport of water
Answer: c) Gaseous exchange
Explanation: Stomata are tiny pores in leaves that facilitate the exchange of oxygen and carbon dioxide.
37. What is the lightest element in the periodic table?
a) Helium
b) Hydrogen
c) Lithium
d) Carbon
Answer: b) Hydrogen
Explanation: Hydrogen, with an atomic number of 1, is the lightest and simplest element.
38. Who is known as the father of modern physics?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Niels Bohr
Answer: b) Albert Einstein
Explanation: Albert Einstein revolutionized physics with his theories of relativity.
39. Which is the smallest planet in our solar system?
a) Mercury
b) Mars
c) Venus
d) Pluto
Answer: a) Mercury
Explanation: Mercury is the smallest planet in the solar system.
40. What is the study of fungi called?
a) Botany
b) Mycology
c) Zoology
d) Ecology
Answer: b) Mycology
Explanation: Mycology is the branch of biology that deals with the study of fungi.
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