NCERT Solution of Class 9 Science Important Question Answer solution with pdf. Here We Provides Class 1 to 12 all Subjects NCERT Solution with Notes, Question Answer, CBSE and HBSE Important Questions, MCQ and old Question Papers for Students.
- Also Read :- Class 9 Science NCERT Solution
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HBSE ( Haryana Board ) Solution of Class 9 Science important Question And Answer solution of Physics, Chemistry and Biology.
HBSE Class 9 Science Important Question Answer 2025
HBSE Class 9 Chapter 1 Matter in Our Surroundings Important Question 2025
Q1. What do you know about sublimation?
Q2. What is reason that we can get the smell of perfume sitting several metres away?
Q3. Arrange the following substances in order of increasing force of attraction between their particles: (a) Water. (b) Sugar, (c) Oxygen, (d) Chlorine
Q4. Why do we see water droplets on the outer surface of a glass containing ice-cold water ?
Q5. How does the water kept in an earthen pot (matka) become cool during summer ? Most Important
Q6. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its
Q7. What will be the physical state of water at 25°C ?
Q8. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
HBSE Class 9 Chapter 2 Is Matter Around Us Pure Important Question 2025
Q1. How are solution, suspension and colloid different from each other ?
Q2. Which are pure substances? Ice, Fe, Hg, Air, Sugar, River water
Ans – Ice, Fe, Hg, Sugar
Q3. Which of the following are chemical or physical changes ?
(A) Cooking of food
(B) Melting of butter in a pan
(C) Boiling of water to form steam
(D) Burning of paper and wood
Q4. Name the technique to separate :
(i) Butter from curd
(ii) Camphor from salt
Q5. What is a Solution ? Write properties of a solution.
Q6. Write Four differences between Mixture and Compound. Most Important
Ans –
| Mixtures | Compounds |
| 1. Elements or compounds just mix together to form a mixture and no new compound is formed. | 1. Elements react to form new compounds. |
| 2. A mixture has a variable composition. | 2. The composition of each new substance is always fixed. |
| 3. A mixture shows the properties of the constituent substances. | 3. The new substance has totally different properties. |
| 4. The constituents can be separated fairly easily by physical methods. | 4. The constituents can be separated only by chemical or electrochemical reactions. |
HBSE Class 9 Chapter 3 Atoms and Molecules Important Questions 2025
Q1. What is ion ? Give its example.
Q2. What are polyatomic ions ? Give examples. Most Important
Q3. Write the law of definite proportions.
OR
Write the Law of Constant Proportion.
Q4. Why is it not possible to see an atom with naked eyes?
Q5. Define and explain molecular formula and write molecular formula of the following compounds:
(i) Sodium Oxide
(ii) Sodium Sulphide
(iii) Aluminium Sulphate
(iv) Magnesium Oxide
(v) Aluminium Oxide
(vi) Calcium Carbonate
Q6. Calculate molecular mass of the following compounds :
ZnCO3, ZnO, CaSO4, Na2S, H2SO4, तथा HNO3
(Atomic Masses : Zn = 65.04, C = 12.04, O = 16.04, Ca = 40.04, S = 32.04, Na = 23.04, H = 1.04, N = 14.04)
Q7. Write the chemical formulae of the following:
(i) Magnesium Chloride
(ii) Copper Nitrate
(iii) Hydrogen Sulphide
Q8. Give the names of the elements present in the following compounds:
(i) Quick lime
(ii) Hydrogen bromide
Q9. Write the formulae of the following
(a) Sodium oxide
(b) Aluminium chloride
Q10. Write the chemical formulae of the following :
(a) Calcium chloride
(b) Aluminium Chloride
Q11. Write down the names of compounds represented by the following :
(a) K2SO4
(b) CaCl2
Q12. Calculate the molecular mass of Nitric Acid (HNO3) .
Q13. Calculate the molecular masses of :
(a) C2H2
(b) Cl2
Q14. Write chemical formula of Carbon tetrachloride.
Ans – CCl4
Q15. Write down the names of compounds represented by the following formula:
(i) Al2(SO4)3
(ii) K2SO4
(iii) CaCO3
HBSE Class 9 Chapter 4 Structure of the Atom Important Questions 2025
Q1. Complete the following table:
| Atomic Number | Atomic Mass | No. of Protons | No. of Neutrons | No. of Electrons |
| 16 | 32 | 16 | ||
| 24 | 12 | 12 | ||
| 11 | 11 | 12 | ||
| 17 | 18 | 17 | ||
| 27 | 13 | 13 |
Q2. Explain with examples: Most Important
(a) Atomic number
(b) Isotopes
Q3. Explain with examples : Most Important
(a) Mass Number
(b) Isobars
Q4. Define mass number. Write the mass number of carbon.
Q5. If K and L shells of an atom are full then what would be the total number of electrons in the atom?
Q6. Write the distribution of electrons in carbon and sodium atoms.
Q7. Name the three sub-atomic particles of an atom.
Q8. Write the distribution of electrons in Nitrogen and Magnesium.
Q9. If number of electrons in an atom is 8 and number of protons is also 8, then:
(i) What is the atomic number of the atom?
(ii) What is the charge on the atom?
Q10. If bromine atom is available in the form of, say, two isotopes [ 7935Br(49.7%) ] and [8135Br(50.3%)] , calculate the average atomic mass of bromine atom.
HBSE Class 9 Chapter 5 The Fundamental Unit of Life Important Questions 2025
Q1. Make a comparison and write down ways in which plant cells are different from animal cells. Most Important
Q2. Write the two differences between Prokaryotic cell and Eukaryotic cell.
Q3. Write down the functions of nucleus.
Q4. Which organelle is known as the powerhouse of the cell ? And why ? Most Important
Q5. Why are lysosomes known as suicide bags ? Most Important
Q6. What is the meaning of cell in Latin ?
Q7. Where do the lipids and proteins constituting the cell membrane synthesized ?
Q8. Draw a well labelled diagram of a plant cell.
Q9. Nervous tissue is made of that receive and conduct impulses.
HBSE Class 9 Chapter 6 Tissues Important Questions 2025
Q1. Describe the role of epidermis in plants. Most Important
Q2. Diagrammatically show the difference between the three types of Muscle Fibres. Most Important
Q3. Write three features of cardiac muscles. Most Important
Q4. Differentiate between striated, unstriated and cardic muscles on the basis of their structure and site in the body.
Q5. Draw a diagram of Smooth muscle.
Q6. Define the neuron with diagram. Most Important
Q7. Name the following :
(a) Tissue that stores fat in our body.
(b) Connective tissue with a fluid matrix.
(c) Tissue present in the brain
Q8. Write the three differences between parenchyma, collenchyma and sclcrenchyma.
Q9. Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall. Most Important
Q10. Describe the structure and functions of Areolar and Cartilage connective tissue.
Q11. Write the three functions of Areolar connective tissue ? Most Important
Q12. What are the functions of the stomata? Most Important
Q13. Which tissue makes up the husk of coconut ?
Q14. What are the constituent of Xylem ?
Q15. Name the tissue that transports food in plants.
Ans – Phloem
Q16. Name the tissue that transports Water in plants.
Ans – Xylem
Q17. How many types of elements together makeup the xylem tissue? Name them.
HBSE Class 9 Chapter 7 Motion Important Questions 2025
Q1. Define Acceleration. Write unit and formula of acceleration. Most Important
Q2. Define average speed. Write the formula of average speed. Most Important
Q3. A train starting from a railway station and moving with uniform acceleration attains a speed 40 km/hour in 10 minutes. Find its acceleration. Most Important
Q4. A racing car has a uniform acceleration of 4 metre/Sec2. What distance will it cover in 10 sec. after start ? Most Important
Q5. A bus decreases its speed from 80 kmh–1 to 60 kmh–1 in 5S. Find the acceleration of the bus.
HBSE Class 9 Chapter 8 Forces and Laws of Motion Important Questions 2025
Q1. Write the Newton first law of motion.
Q2. Write the Newton’s Third Law of Motion.
Q3. Why do you fall in the forward direction, when a moving bus brakes to a stop and fall backwards, when it accelerates from rest? Most Important
Q4. When a carpet is beaten with a stick, dust comes out of it. Explain.
Q5. Why is it advised to tie any luggage kept on the roof of a bus with a rope ?
Q6. A motor car is moving with a velocity of 108 km/hour and it takes 4 second to stop after the brakes are applied. Calculate the force exerted by the brakes on the motor car if its mass along with the passengers is 1000 kg.
HBSE Class 9 Chapter 9 Gravitation Important Questions 2025
Q1. Define Weight. Write the unit of weight.
Q2. Write three differences between the mass of an object and its weight.
Q3. What are the importance of universal law of Gravitation? Most Important
Q4. Why is it difficult to hold a school bag having a strap made of a thin and strong string? Most Important
Q5. An object weight 10 N when measured on the surface of the earth What would be its weight when measured on the surface of the moon?
Q6. What do you mean by buoyancy? The volume of 50 g of a substance is 20 cm3. If the density of water is 1 gcm–3, will the substance float or sink?
Q7. A ball thrown up vertically returns to the thrower after 6 seconds. Find : Most Important
(i) The velocity with which it was thrown up.
(ii) The maximum height it reaches
(iii) Its position after 4 seconds.
Q8. A stone is thrown vertically upward with an initial velocity of 40 m/s. Find the maximum displacement and the total distance covered by the stone ? ( g = 10 m/s2 )
Q9. How does the force of gravitation between two objects change when the distance between them is reduced to half?
HBSE Class 9 Chapter 10 Work and Energy Important Questions 2025
Q1. What is Potential energy ? Write its formula. Most Important
Q2. What is Potential energy ? Give two examples of potential energy ?
Q3. What is the kinetic energy of an object? Write an expression for the kinetic energy of an object.
Q4. Write the law of conservation of energy.
Q5. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy ? Why ?
Q6. What is Power ? Write its S.I. unit. Most Important
Q7. What is power ? Define 1 watt of power.
Q8. Define average power. Most Important
Q9. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’:
(a) Suma is swimming in a pond.
(b) Food grains are getting dried in the sun.
(c) An engine is pulling a train.
(d) A sailboat is moving due to wind energy.
Q10. What are the various energy transformations that occur when you are riding a bicycle ?
Q11. A battery lights a bulb. Describe the energy changes involved in the process.
Q12. Find the energy in KWh consumed in 10 hours by four devices of power 500 W each. Most Important
Q13. An object of mass 15 kg is moving with a uniform velocity of 4 m/s. What is the kinetic energy possessed by the object? Most Important
Q14. An object of mass 40 kg is raised to a height of 5 M above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down. (g = 10 m/sec2)
Q15. Two girls each of weight 200 N, climb up a rope through a height of 4 m. A takes 10 seconds while B takes 30 seconds to accomplish this task. What is the power expanded by each girl ?
Q16. Find the energy possessed by an object of mass 10 kg, when it is at a height of 6 m, above the ground. ( g = 9.8 m/sec2 )
Q17. A bulb consumes 500 J of electrical energy in 10 sec. What is its power?
Q18. A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5m above the ground. Calculate the work done by him on the luggage.
Q19. Calculate the work required to be done to stop a car 1500 kg moving at a velocity of 60 km/h.
HBSE Class 9 Chapter 11 Sound Important Questions 2025
Q1. Define the following terms: Most Important
(i) Time period
(ii) Amplitude
OR
What are time period and amplitude of a sound wave ? Most Important
Q2. Give two practical applications of reflection of sound waves.
Q3. Distinguish between loudness and intensity of sound. Most Important
Q4. The time taken by the wave for one complete oscillation of the density of the medium is called the _______.
Q5. The sound which is produced due to a mixture of several frequencies is called and is pleasant to listen.
HBSE Class 9 Chapter 12 Improvement in Food Resources Important Questions 2025
Q1. How animal husbandry practices are beneficial for farmers? Most Important
Q2. How are fish obtained ? Most Important
Q3. For increasing production, what is common in poultry, fisheries and bee- keeping ?
Q4. Write about composite fish culture.
Q5. What are infectious diseases? Give one example.
Q6. What is pasturage and how is it related to honey production ?
Q7. What is soil erosion ?
Q8. Write two common management practices of animal husbandary and poultry farming.