Class 9 Science MCQs, Updated for This Session

Q1.Which organelle is universally designated as the "Powerhouse of the Cell" due to ATP synthesis?

Q2.The movement of water molecules across a selectively permeable membrane along a concentration gradient is called:

Q3.Which organelle contains hydrolytic digestive enzymes and is termed the "Suicide Bag" of the cell?

Q4.Plant cell walls are primarily composed of which complex carbohydrate?

Q5.Which of the following cellular structures is present in prokaryotic cells?

Q1.Which plant tissue is actively responsible for the increase in girth (diameter) of stems and roots?

Q2.The husk of a coconut is composed of dead, thick-walled cells belonging to which tissue?

Q3.Which connective tissue links skeletal muscles firmly to bones?

Q4.Which vascular tissue conducts photosynthesized organic nutrients (sucrose) bidirectionally in plants?

Q5.Involuntary, branched, and uninucleated muscle fibres with intercalated discs are found exclusively in:

Q1.An athlete completes one circular lap of radius $r$ in 40 seconds. What is the displacement at $t = 2$ minutes?

Q2.The area enclosed under a Velocity-Time ($v\text{-}t$) graph represents which physical quantity?

Q3.A vehicle uniformly accelerates from rest at $2\text{ m/s}^2$ for 5 seconds. What distance does it cover?

Q4.When an object moves in a circular path at constant speed, its motion is classified as:

Q5.The slope of a Distance-Time graph directly indicates the object's:

Q1.The scattering of a visible beam of light when passed through a colloidal solution is termed the:

Q2.Which technique is ideal for separating two miscible liquids whose boiling points differ by less than 25 K?

Q3.A solution containing 40 g of common salt dissolved in 320 g of water has a mass percentage concentration of:

Q4.Which of the following represents a homogeneous mixture?

Q5.Camphor can be cleanly separated from a mixture with sodium chloride using:

Q1.Newton's First Law of Motion defines the fundamental physical concept of:

Q2.What net force is required to accelerate a 1500 kg automobile at $3\text{ m/s}^2$?

Q3.A fielder pulls his hands backwards while catching a fast cricket ball primarily to:

Q4.Action and reaction forces described in Newton's Third Law of Motion always act on:

Q5.The total linear momentum of an isolated system of colliding bodies is:

Q1.A porter carries a 20 kg luggage on his head and walks 50 m horizontally. Work done by gravity is:

Q2.If the velocity of a moving vehicle is tripled, its kinetic energy increases by a factor of:

Q3.An electric appliance consumes 1000 Joules of electrical energy in 2 seconds. Its power rating is:

Q4.In an ideal simple machine, Mechanical Advantage (MA) is defined as the ratio of:

Q5.How many Joules are equivalent to 1 kilowatt-hour ($1\text{ kWh}$) of commercial electrical energy?

Q1.Rutherford's Alpha Particle Scattering Experiment led directly to the discovery of the:

Q2.What is the maximum electron capacity of the M-shell ($n = 3$) governed by the $2n^2$ rule?

Q3.Atoms of different elements having the same mass number ($A$) but different atomic numbers ($Z$) are called:

Q4.The subatomic particle with unit positive charge ($+1.6 \times 10^{-19}\text{ C}$) located in the nucleus is the:

Q5.An isotope of which element is widely utilized in nuclear reactors to generate electricity?

Q1."In a chemical compound, elements are always combined in fixed proportions by mass." This law is:

Q2.What is the correct chemical formula of Aluminium Sulphate?

Q3.What is the molar mass of Calcium Carbonate ($\text{CaCO}_3$)? ($\text{Ca}=40, \text{C}=12, \text{O}=16\text{ u}$)

Q4.How many moles are present in 54 grams of pure water ($\text{H}_2\text{O}$)?

Q5.The standard reference isotope chosen internationally for atomic mass units is:

Q1.Sound waves travelling through ambient air are classified physically as:

Q2.What is the speed of a sound wave with frequency 220 Hz and wavelength 1.5 m?

Q3.What minimum distance must separate an observer from a reflecting wall to hear a distinct echo ($v = 344\text{ m/s}$)?

Q4.Sound waves with frequencies exceeding 20,000 Hz are designated as:

Q5.The pitch of a sound wave is directly determined by which acoustic characteristic?

Q1.Amoeba reproduces asexually through which common cellular process?

Q2.The primary male sex hormone produced by interstitial cells in the testes is:

Q3.In human females, fertilization of the ovum by a sperm typically occurs within the:

Q4.Vegetative propagation in Bryophyllum occurs naturally through adventitious buds on its:

Q5.The fusion of a haploid male gamete with a haploid female gamete produces a diploid:

Q1.Who introduced the Binomial Nomenclature system universally used for scientific naming?

Q2.Non-vascular terrestrial plants often referred to as the "Amphibians of the Plant Kingdom" are:

Q3.Organisms characterized by jointed appendages, chitinous exoskeletons, and open circulatory systems belong to phylum:

Q4.Which of the following plants bears naked seeds without forming protective fruits?

Q5.Which taxonomic rank represents the fundamental, smallest basic unit of biological classification?

Q1.The conversion of atmospheric nitrogen gas into usable nitrates and ammonium by rhizobia is called:

Q2.Which atmospheric layer contains the protective ozone layer that absorbs harmful UV-B radiation?

Q3.Excessive enrichment of water bodies with agricultural nitrates leading to dense algal blooms is termed:

Q4.Which greenhouse gas contributes most significantly to enhanced anthropogenic global warming?

Q5.The global continuous movement of water across oceans, atmosphere, and land is powered primarily by: