Dr. Homi Bhabha Exam sample question paper for Class 9 with our comprehensive set 7 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 easy 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 gas is released during photosynthesis?
a) Carbon Dioxide
b) Nitrogen
c) Oxygen
d) Methane
Answer: c) Oxygen
Explanation: Photosynthesis produces oxygen as a byproduct when plants convert carbon dioxide and water into glucose using sunlight.
2. Which organ in the human body is primarily responsible for filtering blood?
a) Heart
b) Liver
c) Kidneys
d) Lungs
Answer: c) Kidneys
Explanation: The kidneys filter blood, removing waste products and excess substances to form urine.
3. What is the main function of the stomata in plant leaves?
a) Absorb water
b) Perform photosynthesis
c) Exchange gases
d) Produce seeds
Answer: c) Exchange gases
Explanation: Stomata are small openings on leaves that allow for gas exchange, primarily oxygen and carbon dioxide.
4. What type of rock is formed from volcanic activity?
a) Igneous
b) Sedimentary
c) Metamorphic
d) Shale
Answer: a) Igneous
Explanation: Igneous rocks are formed from the cooling and solidification of molten lava or magma.
5. What is the primary source of energy for the water cycle?
a) Wind
b) Sun
c) Moon
d) Volcanoes
Answer: b) Sun
Explanation: The sun provides the energy that drives the water cycle by causing evaporation of water.
6. Which component of blood fights infection?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
Answer: b) White blood cells
Explanation: White blood cells help the body fight infections by attacking bacteria, viruses, and other pathogens.
7. The rate of change of velocity of an object is known as:
a) Speed
b) Acceleration
c) Force
d) Momentum
Answer: b) Acceleration
Explanation: Acceleration refers to how quickly an object’s velocity changes over time.
8. What is the boiling point of water at sea level?
a) 0°C
b) 50°C
c) 100°C
d) 200°C
Answer: c) 100°C
Explanation: At sea level, water boils at 100°C (212°F) under standard atmospheric pressure.
9. Which organ is responsible for pumping blood throughout the body?
a) Brain
b) Lungs
c) Liver
d) Heart
Answer: d) Heart
Explanation: The heart is a muscular organ that pumps blood to all parts of the body.
10. What is the term for substances that speed up chemical reactions in living organisms?
a) Enzymes
b) Proteins
c) Carbohydrates
d) Acids
Answer: a) Enzymes
Explanation: Enzymes are biological catalysts that accelerate chemical reactions in living organisms.
11. In which layer of the atmosphere is the ozone layer located?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
Answer: b) Stratosphere
Explanation: The ozone layer, which absorbs harmful UV radiation, is located in the stratosphere.
12. Which substance makes up the cell walls of plants?
a) Cellulose
b) Protein
c) Glucose
d) Chitin
Answer: a) Cellulose
Explanation: Cellulose is a complex carbohydrate that forms the rigid cell walls in plant cells.
13. What is the formula for calculating work done when force and displacement are known?
a) Force × Time
b) Force × Displacement
c) Displacement / Time
d) Force / Area
Answer: b) Force × Displacement
Explanation: Work is calculated by multiplying the force applied by the displacement of the object in the direction of the force.
14. Which disease is caused by the deficiency of Vitamin D?
a) Scurvy
b) Rickets
c) Beriberi
d) Anemia
Answer: b) Rickets
Explanation: Rickets, which causes softening and weakening of bones, is caused by a lack of vitamin D.
15. What is the SI unit of electric current?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c) Ampere
Explanation: The ampere is the SI unit used to measure electric current.
16. The process of purifying ore by heating it in the absence of air is known as:
a) Smelting
b) Roasting
c) Calcination
d) Electrolysis
Answer: c) Calcination
Explanation: Calcination is the process of heating an ore to remove volatile impurities, typically in the absence of air.
17. What type of reaction is represented by the equation: Zn + CuSO₄ → ZnSO₄ + Cu?
a) Synthesis
b) Decomposition
c) Displacement
d) Combustion
Answer: c) Displacement
Explanation: In this displacement reaction, zinc replaces copper in copper sulfate.
18. Which law states that pressure and volume of a gas are inversely proportional at constant temperature?
a) Boyle’s Law
b) Charles’s Law
c) Avogadro’s Law
d) Ideal Gas Law
Answer: a) Boyle’s Law
Explanation: Boyle’s Law states that at constant temperature, the pressure and volume of a gas have an inverse relationship.
19. What is the atomic number of calcium?
a) 12
b) 16
c) 20
d) 24
Answer: c) 20
Explanation: Calcium has an atomic number of 20, meaning it has 20 protons in its nucleus.
20. Which of the following organisms is classified as an amphibian?
a) Whale
b) Crocodile
c) Frog
d) Eagle
Answer: c) Frog
Explanation: Frogs are amphibians, meaning they can live both in water and on land.
21. Which of the following metals is extracted using the electrolysis process?
a) Iron
b) Copper
c) Aluminium
d) Zinc
Answer: c) Aluminium
Explanation: Aluminium is extracted using electrolysis from its ore, bauxite.
22. Which of the following is a property of acids?
a) Bitter taste
b) Turns blue litmus paper red
c) Slippery feel
d) Does not react with metals
Answer: b) Turns blue litmus paper red
Explanation: Acids turn blue litmus paper red and have a sour taste.
23. What is the molecular formula of glucose?
a) C₆H₁₂O₆
b) C₁₂H₂O₆
c) C₆H₆O₆
d) C₆H₁₀O₆
Answer: a) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the molecular formula C₆H₁₂O₆.
24. In a series circuit, how does the current behave when additional resistors are added?
a) Increases
b) Decreases
c) Remains the same
d) Fluctuates
Answer: b) Decreases
Explanation: In a series circuit, adding more resistors increases the total resistance, which causes the current to decrease.
25. What is the product formed when hydrochloric acid reacts with sodium hydroxide?
a) Sodium chloride and water
b) Sodium chloride and oxygen
c) Sodium hydroxide and water
d) Hydrogen and oxygen
Answer: a) Sodium chloride and water
Explanation: The reaction between hydrochloric acid and sodium hydroxide produces sodium chloride (salt) and water.
26. Which of the following is a renewable source of energy?
a) Coal
b) Natural gas
c) Solar energy
d) Nuclear energy
Answer: c) Solar energy
Explanation: Solar energy is a renewable resource, as it is replenished by the Sun.
27. What is the process of changing a liquid to gas called?
a) Freezing
b) Melting
c) Evaporation
d) Condensation
Answer: c) Evaporation
Explanation: Evaporation is the process where a liquid turns into a gas, typically due to heat.
28. The force that pulls objects toward the Earth’s surface is called:
a) Magnetism
b) Gravity
c) Friction
d) Tension
Answer: b) Gravity
Explanation: Gravity is the force that attracts objects towards the Earth’s center.
29. Which of the following elements is a noble gas?
a) Oxygen
b) Nitrogen
c) Neon
d) Carbon
Answer: c) Neon
Explanation: Neon is a noble gas, known for its inertness and lack of reactivity.
30. What is the main function of the digestive system in humans?
a) Circulates blood
b) Breaks down food to absorb nutrients
c) Removes waste from the body
d) Controls body temperature
Answer: b) Breaks down food to absorb nutrients
Explanation: The digestive system breaks down food into nutrients, which are absorbed into the bloodstream.
31. Which of the following is a part of the electromagnetic spectrum?
a) Sound waves
b) Water waves
c) Radio waves
d) Earthquake waves
Answer: c) Radio waves
Explanation: Radio waves are a type of electromagnetic wave used in communication and broadcasting.
32. What is the name of the force that resists the motion of an object sliding over another surface?
a) Tension
b) Friction
c) Gravity
d) Pressure
Answer: b) Friction
Explanation: Friction is the force that opposes the motion of objects sliding over each other.
33. Which of the following gases is primarily responsible for the greenhouse effect?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
Explanation: Carbon dioxide is a greenhouse gas that traps heat in the Earth’s atmosphere, contributing to global warming.
34. What is the atomic number of oxygen?
a) 6
b) 8
c) 10
d) 12
Answer: b) 8
Explanation: Oxygen has an atomic number of 8, which means it has 8 protons in its nucleus.
35. Which of the following is a characteristic of an exothermic reaction?
a) Absorbs heat
b) Releases heat
c) Requires light
d) Needs electricity
Answer: b) Releases heat
Explanation: Exothermic reactions release energy, often in the form of heat.
36. The process by which a solid changes directly into a gas is called:
a) Melting
b) Freezing
c) Sublimation
d) Condensation
Answer: c) Sublimation
Explanation: Sublimation is the process where a solid turns directly into a gas without passing through the liquid phase, as seen in dry ice.
37. Who is known as the “Father of Modern Physics”?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Michael Faraday
Answer: b) Albert Einstein
Explanation: Albert Einstein’s contributions, especially his theory of relativity, earned him the title “Father of Modern Physics.”
38. What is the primary component of natural gas?
a) Ethane
b) Butane
c) Methane
d) Propane
Answer: c) Methane
Explanation: Methane makes up about 70-90% of natural gas.
39. Who invented the electric bulb?
a) Alexander Graham Bell
b) Thomas Edison
c) Nikola Tesla
d) James Watt
Answer: b) Thomas Edison
Explanation: Thomas Edison is credited with inventing the practical electric light bulb.
40. Which planet is known as the “Red Planet”?
a) Venus
b) Mars
c) Jupiter
d) Saturn
Answer: b) Mars
Explanation: Mars is called the “Red Planet” due to its reddish appearance, which is caused by iron oxide on its surface.
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