Dr. Homi Bhabha Exam sample question paper for Class 9 with our comprehensive set 5 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 of the following is the primary source of energy for all life on Earth?
a) Wind energy
b) Solar energy
c) Geothermal energy
d) Tidal energy
Answer: b) Solar energy
Explanation: Solar energy from the Sun is the primary source of energy for most life on Earth, driving photosynthesis and the climate.
2. In which type of climate would you expect to find a high diversity of plant and animal species?
a) Desert
b) Tundra
c) Tropical rainforest
d) Grassland
Answer: c) Tropical rainforest
Explanation: Tropical rainforests have high biodiversity due to warm temperatures, high rainfall, and abundant resources.
3. What is the process by which plants lose water vapor through small openings on their leaves?
a) Photosynthesis
b) Respiration
c) Transpiration
d) Osmosis
Answer: c) Transpiration
Explanation: Transpiration is the process by which water vapor is lost through stomata, helping regulate temperature and water balance.
4. Which of the following is a non-renewable resource?
a) Solar energy
b) Coal
c) Wind energy
d) Hydroelectric energy
Answer: b) Coal
Explanation: Coal is a fossil fuel that cannot be replenished quickly, making it a non-renewable resource.
5. Which component of the blood is responsible for transporting oxygen?
a) White blood cells
b) Platelets
c) Red blood cells
d) Plasma
Answer: c) Red blood cells
Explanation: Red blood cells contain hemoglobin, which binds with oxygen and transports it throughout the body.
6. The process by which heat is transferred through a fluid by the movement of the fluid itself is called:
a) Conduction
b) Radiation
c) Convection
d) Diffusion
Answer: c) Convection
Explanation: Convection involves the movement of molecules within fluids, transferring heat in the process.
7. Which plant tissue is responsible for transporting water and nutrients from roots to other parts of the plant?
a) Phloem
b) Xylem
c) Cambium
d) Epidermis
Answer: b) Xylem
Explanation: Xylem transports water and dissolved minerals from the roots to the rest of the plant.
8. What type of reaction is represented by the equation A + B → AB\text{A + B → AB}?
a) Decomposition reaction
b) Displacement reaction
c) Synthesis reaction
d) Redox reaction
Answer: c) Synthesis reaction
Explanation: A synthesis reaction combines two or more simple substances to form a more complex compound.
9. Which of the following is a chemical change?
a) Melting of ice
b) Evaporation of water
c) Burning of wood
d) Dissolving salt in water
Answer: c) Burning of wood
Explanation: Burning wood is a chemical change as it produces new substances, such as ash and gases.
10. The force of gravity on an object is also known as its:
a) Mass
b) Weight
c) Density
d) Volume
Answer: b) Weight
Explanation: Weight is the force exerted by gravity on an object, measured as mass multiplied by gravitational acceleration.
11. Which of the following organisms is capable of nitrogen fixation?
a) Humans
b) Blue-green algae
c) Fish
d) Insects
Answer: b) Blue-green algae
Explanation: Some blue-green algae (cyanobacteria) can fix atmospheric nitrogen into a usable form for plants.
12. In an ecosystem, which group of organisms is responsible for breaking down dead matter and returning nutrients to the soil?
a) Producers
b) Consumers
c) Decomposers
d) Herbivores
Answer: c) Decomposers
Explanation: Decomposers break down dead organic matter, recycling nutrients into the ecosystem.
13. What is the unit of electric power?
a) Joule
b) Watt
c) Coulomb
d) Volt
Answer: b) Watt
Explanation: Electric power is measured in watts, which is the rate at which electrical energy is used or produced.
14. Which of the following elements is an alkali metal?
a) Helium
b) Sodium
c) Oxygen
d) Carbon
Answer: b) Sodium
Explanation: Alkali metals are in Group 1 of the periodic table, and sodium is one of them.
15. What property of sound changes when the pitch changes?
a) Amplitude
b) Frequency
c) Speed
d) Wavelength
Answer: b) Frequency
Explanation: Pitch is related to frequency; a higher frequency corresponds to a higher pitch.
16. What is the function of the mitochondria in a cell?
a) Protein synthesis
b) Storage of genetic material
c) Energy production
d) Transport of materials
Answer: c) Energy production
Explanation: Mitochondria are the “powerhouses” of the cell, where energy (ATP) is produced through cellular respiration.
17. In the human body, which organ filters blood to remove waste and excess fluids?
a) Liver
b) Lungs
c) Heart
d) Kidneys
Answer: d) Kidneys
Explanation: The kidneys filter blood, removing waste products and excess fluid, which are excreted as urine.
18. Which of the following is the longest bone in the human body?
a) Humerus
b) Femur
c) Tibia
d) Radius
Answer: b) Femur
Explanation: The femur, or thigh bone, is the longest and strongest bone in the human body.
19. The pH of pure water at 25°C is approximately:
a) 3
b) 7
c) 9
d) 14
Answer: b) 7
Explanation: Pure water is neutral with a pH of 7 at 25°C, meaning it has an equal concentration of hydrogen and hydroxide ions.
20. In an electric circuit, if the voltage is increased while resistance remains constant, what happens to the current?
a) Decreases
b) Remains the same
c) Increases
d) Stops
Answer: c) Increases
Explanation: According to Ohm’s Law (V = IR), if voltage increases and resistance is constant, the current will increase.
21. Which disease is caused by the deficiency of vitamin D?
a) Scurvy
b) Rickets
c) Beriberi
d) Anemia
Answer: b) Rickets
Explanation: Vitamin D deficiency can cause rickets, leading to weak and deformed bones in children.
22. In which part of the eye is the image formed?
a) Cornea
b) Retina
c) Iris
d) Pupil
Answer: b) Retina
Explanation: The retina is the light-sensitive layer of the eye where images are focused and then sent to the brain.
23. What is the primary purpose of chlorophyll in plants?
a) To absorb carbon dioxide
b) To transport nutrients
c) To absorb sunlight
d) To protect from insects
Answer: c) To absorb sunlight
Explanation: Chlorophyll is a green pigment that absorbs sunlight, enabling photosynthesis in plants.
24. Which gas is most abundant in the 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, making it the most abundant gas.
25. Which of the following is a good conductor of electricity?
a) Wood
b) Rubber
c) Copper
d) Glass
Answer: c) Copper
Explanation: Copper is a metal and an excellent conductor of electricity, commonly used in wiring.
26. Which of the following pairs are homologous structures?
a) Wings of a bat and wings of a butterfly
b) Forelimbs of a human and forelimbs of a cat
c) Wings of a bird and wings of a bat
d) Fins of a fish and legs of a frog
Answer: b) Forelimbs of a human and forelimbs of a cat
Explanation: Homologous structures have a similar origin but may serve different functions, like human and cat forelimbs.
27. In which organ does the process of digestion begin?
a) Stomach
b) Small intestine
c) Large intestine
d) Mouth
Answer: d) Mouth
Explanation: Digestion begins in the mouth, where enzymes in saliva start breaking down food.
28. Which type of mirror is used in car headlights to reflect light in a parallel beam?
a) Plane mirror
b) Convex mirror
c) Concave mirror
d) Spherical mirror
Answer: c) Concave mirror
Explanation: Concave mirrors focus light into a parallel beam, making them ideal for use in headlights.
29. When light passes from air into glass, it:
a) Speeds up
b) Slows down
c) Does not change speed
d) Stops completely
Answer: b) Slows down
Explanation: Light slows down when it passes into a denser medium like glass, causing it to refract.
30. Which of these is NOT a renewable source of energy?
a) Wind
b) Solar
c) Coal
d) Hydropower
Answer: c) Coal
Explanation: Coal is a non-renewable energy source as it takes millions of years to form.
31. The theory that all living things are composed of cells is known as the:
a) Gene Theory
b) Evolution Theory
c) Cell Theory
d) Germ Theory
Answer: c) Cell Theory
Explanation: The Cell Theory states that all organisms are composed of cells, the basic unit of life.
32. Which of the following processes does NOT involve a chemical reaction?
a) Burning of wood
b) Rusting of iron
c) Melting of ice
d) Digestion of food
Answer: c) Melting of ice
Explanation: Melting of ice is a physical change, not a chemical reaction, as no new substances are formed.
33. In which layer of Earth’s atmosphere does weather occur?
a) Stratosphere
b) Mesosphere
c) Thermosphere
d) Troposphere
Answer: d) Troposphere
Explanation: Weather occurs in the troposphere, the layer closest to Earth’s surface where air movement is most active.
34. Which particle in an atom has a negative charge?
a) Proton
b) Neutron
c) Electron
d) Nucleus
Answer: c) Electron
Explanation: Electrons have a negative charge, while protons are positive and neutrons are neutral.
35. What type of bond is formed when two atoms share electrons?
a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond
Answer: b) Covalent bond
Explanation: In a covalent bond, atoms share electrons to achieve a stable electronic configuration.
36. The boiling point of water at sea level is:
a) 50°C
b) 75°C
c) 100°C
d) 120°C
Answer: c) 100°C
Explanation: Water boils at 100°C at sea level under standard atmospheric pressure.
37. The scientist who discovered penicillin was:
a) Louis Pasteur
b) Alexander Fleming
c) Marie Curie
d) Gregor Mendel
Answer: b) Alexander Fleming
Explanation: Alexander Fleming discovered penicillin, the first antibiotic, in 1928, revolutionizing medicine.
38. Which planet has the largest number of moons?
a) Earth
b) Mars
c) Saturn
d) Venus
Answer: c) Saturn
Explanation: Saturn has the largest number of confirmed moons in our solar system, surpassing Jupiter.
39. The SI unit of temperature is:
a) Celsius
b) Fahrenheit
c) Kelvin
d) Rankine
Answer: c) Kelvin
Explanation: Kelvin is the SI base unit of temperature, often used in scientific measurements.
40. Which gas is commonly used in balloons because it is lighter than air and non-flammable?
a) Hydrogen
b) Nitrogen
c) Helium
d) Oxygen
Answer: c) Helium
Explanation: Helium is lighter than air and non-flammable, making it a safe choice for filling balloons.
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