Dr. Homi Bhabha Exam sample question paper for Class 9 with our comprehensive set 6 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 hard 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 “control center” of a cell?
a) Mitochondria
b) Nucleus
c) Ribosome
d) Golgi apparatus
Answer: b) Nucleus
Explanation: The nucleus controls cell activities and stores the cell’s genetic information.
2. Which of the following is NOT a characteristic of living organisms?
a) Growth
b) Reproduction
c) Respiration
d) Freezing
Answer: d) Freezing
Explanation: Freezing is a physical process, not a characteristic of living organisms.
3. Which gas is released during photosynthesis?
a) Nitrogen
b) Carbon dioxide
c) Oxygen
d) Hydrogen
Answer: c) Oxygen
Explanation: Oxygen is released as a byproduct of photosynthesis.
4. What is the role of the xylem in plants?
a) Transport of water and minerals
b) Transport of food
c) Protection against infection
d) Storage of food
Answer: a) Transport of water and minerals
Explanation: Xylem transports water and dissolved minerals from roots to other parts of the plant.
5. Which type of reproduction occurs in yeast?
a) Binary fission
b) Budding
c) Fragmentation
d) Regeneration
Answer: b) Budding
Explanation: Yeast reproduces by budding, where a new cell grows out from the body of the parent cell.
6. What is the primary function of red blood cells?
a) Transport oxygen
b) Fight infections
c) Produce antibodies
d) Regulate temperature
Answer: a) Transport oxygen
Explanation: Red blood cells contain hemoglobin, which transports oxygen throughout the body.
7. Which of the following is NOT an endocrine gland?
a) Thyroid
b) Pancreas
c) Salivary gland
d) Adrenal gland
Answer: c) Salivary gland
Explanation: The salivary gland is not an endocrine gland; it secretes saliva into the mouth.
8. What is the chemical formula for methane?
a) CH₄
b) C₂H₆
c) CO₂
d) C₃H₈
Answer: a) CH₄
Explanation: Methane consists of one carbon atom and four hydrogen atoms, represented as CH₄.
9. Which gas is used in fire extinguishers?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Methane
Answer: c) Carbon dioxide
Explanation: Carbon dioxide displaces oxygen, extinguishing fires effectively.
10. The SI unit of force is:
a) Pascal
b) Newton
c) Joule
d) Watt
Answer: b) Newton
Explanation: Newton is the SI unit of force, named after Sir Isaac Newton.
11. What type of lens is used to correct short-sightedness (myopia)?
a) Convex lens
b) Concave lens
c) Plane lens
d) Cylindrical lens
Answer: b) Concave lens
Explanation: Concave lenses help diverge light rays, correcting myopia.
12. The deficiency of which vitamin causes night blindness?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
Answer: a) Vitamin A
Explanation: Vitamin A is essential for healthy vision, and its deficiency leads to night blindness.
13. What is the chemical formula of acetic acid?
a) HCl
b) C₂H₆O
c) CH₃COOH
d) C₆H₆
Answer: c) CH₃COOH
Explanation: Acetic acid, the main component of vinegar, has the formula CH₃COOH.
14. Which layer of the atmosphere contains the ozone layer?
a) Troposphere
b) Mesosphere
c) Stratosphere
d) Thermosphere
Answer: c) Stratosphere
Explanation: The ozone layer, which protects Earth from UV radiation, is located in the stratosphere.
15. What is the primary component of natural gas?
a) Ethane
b) Propane
c) Butane
d) Methane
Answer: d) Methane
Explanation: Natural gas primarily consists of methane, a hydrocarbon.
16. Which part of the brain is responsible for balance and coordination?
a) Cerebrum
b) Cerebellum
c) Medulla
d) Hypothalamus
Answer: b) Cerebellum
Explanation: The cerebellum controls balance, posture, and coordination.
17. In which type of reaction is energy absorbed?
a) Exothermic reaction
b) Endothermic reaction
c) Neutralization reaction
d) Redox reaction
Answer: b) Endothermic reaction
Explanation: Endothermic reactions absorb energy from their surroundings.
18. The number of chromosomes in a human gamete is:
a) 23
b) 46
c) 22
d) 24
Answer: a) 23
Explanation: Human gametes have 23 chromosomes, half the number found in somatic cells.
19. What is Newton’s Third Law of Motion?
a) Every action has an equal and opposite reaction
b) Force equals mass times acceleration
c) An object in motion stays in motion
d) Gravitational force attracts objects
Answer: a) Every action has an equal and opposite reaction
Explanation: Newton’s Third Law states that forces between two objects are equal in magnitude and opposite in direction.
20. Which of the following is a greenhouse gas?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Helium
Answer: b) Carbon dioxide
Explanation: Carbon dioxide traps heat in the atmosphere, contributing to global warming.
21. What type of reaction occurs when hydrochloric acid reacts with sodium hydroxide?
a) Combustion
b) Synthesis
c) Neutralization
d) Decomposition
Answer: c) Neutralization
Explanation: The reaction between an acid and a base produces water and salt, called a neutralization reaction.
22. Which part of the cell contains genetic material?
a) Mitochondria
b) Cytoplasm
c) Nucleus
d) Ribosome
Answer: c) Nucleus
Explanation: The nucleus contains DNA, which stores the cell’s genetic information.
23. The process of splitting water into hydrogen and oxygen using electricity is called:
a) Distillation
b) Electrolysis
c) Filtration
d) Crystallization
Answer: b) Electrolysis
Explanation: Electrolysis uses electric current to break water molecules into hydrogen and oxygen.
24. What type of mirror is used as a rear-view mirror in vehicles?
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, making them suitable for rear-view mirrors.
25. Which of the following elements is not required for plant growth?
a) Nitrogen
b) Phosphorus
c) Mercury
d) Potassium
Answer: c) Mercury
Explanation: Mercury is not essential for plant growth; in fact, it is toxic to plants.
26. In which of the following does the speed of sound travel fastest?
a) Air
b) Water
c) Steel
d) Vacuum
Answer: c) Steel
Explanation: Sound travels fastest in solids like steel due to tightly packed molecules, enabling efficient transmission of vibrations.
27. Which gas is evolved when an acid reacts with a metal?
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Carbon dioxide
Answer: b) Hydrogen
Explanation: When acids react with metals, they produce hydrogen gas as a byproduct.
28. Which of the following acids is found in citrus fruits like oranges and lemons?
a) Acetic acid
b) Citric acid
c) Tartaric acid
d) Hydrochloric acid
Answer: b) Citric acid
Explanation: Citric acid gives citrus fruits their sour taste.
29. Which process is responsible for water loss in plants through stomata?
a) Transpiration
b) Photosynthesis
c) Absorption
d) Digestion
Answer: a) Transpiration
Explanation: Transpiration is the process of water evaporation from plant leaves through stomata.
30. What is the pH level of a neutral solution at 25°C?
a) 0
b) 7
c) 14
d) 10
Answer: b) 7
Explanation: A pH of 7 indicates a neutral solution, meaning it is neither acidic nor basic.
31. Which vitamin is produced in the human skin when exposed to sunlight?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D
Answer: d) Vitamin D
Explanation: Sunlight triggers the production of vitamin D in the skin, essential for bone health.
32. What is the name of the process by which plants prepare their own food using sunlight?
a) Respiration
b) Transpiration
c) Photosynthesis
d) Digestion
Answer: c) Photosynthesis
Explanation: Photosynthesis is the process through which plants convert sunlight into energy, producing food.
33. Which component of the blood helps in clotting?
a) White blood cells
b) Platelets
c) Plasma
d) Red blood cells
Answer: b) Platelets
Explanation: Platelets are responsible for blood clotting, preventing excessive bleeding.
34. What is the SI unit of power?
a) Joule
b) Watt
c) Newton
d) Pascal
Answer: b) Watt
Explanation: Power is measured in watts, which indicates the rate of energy transfer.
35. The study of heredity and variation is known as:
a) Physiology
b) Genetics
c) Ecology
d) Botany
Answer: b) Genetics
Explanation: Genetics deals with the study of genes, heredity, and variation in living organisms.
36. In an electric circuit, which device is used to prevent excessive current?
a) Resistor
b) Capacitor
c) Fuse
d) Switch
Answer: c) Fuse
Explanation: A fuse protects an electric circuit by breaking the circuit if current exceeds safe levels.
37. Which planet is known as the “Red Planet”?
a) Venus
b) Mars
c) Jupiter
d) Mercury
Answer: b) Mars
Explanation: Mars is called the “Red Planet” due to its reddish appearance, caused by iron oxide on its surface.
38. What is the hardest natural substance on Earth?
a) Gold
b) Graphite
c) Diamond
d) Iron
Answer: c) Diamond
Explanation: Diamond is the hardest known natural material due to its strong carbon bonding.
39. Which metal is a liquid at room temperature?
a) Iron
b) Mercury
c) Silver
d) Lead
Answer: b) Mercury
Explanation: Mercury is the only metal that is liquid at room temperature.
40. Who is known as the “Father of Modern Physics”?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Marie Curie
Answer: b) Albert Einstein
Explanation: Albert Einstein is known as the “Father of Modern Physics” due to his revolutionary contributions.
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