Class 9 Science Student Questions

Questions created by CREST students. Answer them and earn Practice PointsHow to earn pointsAsk a question+3Answer a question+1Someone answers yours+1Your Q gets upvoted+1Pioneer bonus (first 5)+51 point = ₹1 discount on purchases! Rules for asking and answering

Class 9 Science questions written by CREST students for other students, as practice for the CREST Science Olympiad (CSO). Each question belongs to one of the Class 9 Science topics: Motion, Force and Laws of Motion, Gravitation, Work and Energy, Sound, Matter in Our Surroundings and 9 more.

There are 315 questions so far, newest first. Choose an answer and you see at once whether it is right, with the explanation the student gave. For the real exam pattern, try the Class 9 sample paper and the Class 9 previous year paper, and check the CSO syllabus.

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Showing: Class 9 / Science (315 questions)

by GIANSH GUPTA KHUNDKER · Class 9

WHAT IS MOTION????????????????????????????????????????????????????????????????????

Science Motion 0 1 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

During oxidative phosphorylation in aerobic cellular respiration, which component of the mitochondrion builds up a high concentration gradient of protons (H⁺) to drive ATP synthesis via ATP synthase?

Science Other 0 2 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

If 20.0 g of sulfur dioxide (SO₂) reacts with 10.0 g of oxygen (O₂) to produce sulfur trioxide (SO₃) according to the balanced equation 2SO₂(g) + O₂(g) → 2SO₃(g), what is the mass of the excess reactant remaining unreacted? (Molar masses: SO₂ = 64 g/mol, O₂ = 32 g/mol)

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

An object moves along a straight line such that its velocity v as a function of time t is given by v(t) = 3t² - 12t + 9 (in m/s). What is the total distance traveled by the object in the time interval from t = 0 s to t = 3 s?

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Why do we fall ill?

Science Why Do We Fall Ill 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Which animal connective tissue houses mature chondrocytes inside structural cavities called lacunae?

Science Other 0 1 answers 100%
by GIANSH GUPTA KHUNDKER · Class 9

Which component represents the only living cellular element found within complex Xylem tissue?

Science Cell � The Fundamental Unit of Life 0 1 answers 100%
by GIANSH GUPTA KHUNDKER · Class 9

Which living plant tissue features structural pectin thickening at cell corners to provide flexible support?

Science Other 0 1 answers 100%
by GIANSH GUPTA KHUNDKER · Class 9

Which process causes a red blood cell to shrink and crenate when placed in a hypertonic salt solution?

Science Atoms and Molecules 0 2 answers 100%
by GIANSH GUPTA KHUNDKER · Class 9

What structure fails to form during plant cell cytokinesis if the Golgi apparatus is chemically inhibited?

Science Cell � The Fundamental Unit of Life 0 1 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

A particle moves along a straight line so that its displacement s (in metres) at time t (in seconds) is s = t³ - 6t² + 9t + 4. What is the velocity of the particle when its acceleration becomes zero?

Science Motion 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

An astronaut on a newly discovered planet drops a small 2 kg sphere from a height of 20 m. It takes exactly 4 seconds to hit the ground. The planet is perfectly spherical with a radius equal to half of the Earth's radius. Assuming no air resistance, what is the ratio of the mass of the planet to the mass of the Earth? (Take g on Earth = 10 m/s²)

Science Other 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

Two bodies with masses M1 and M2 are separated by a distance R, and the gravitational force between them is F. If the mass of the first body is doubled, the mass of the second is halved, and the distance between their centres is reduced to R/2, what will be the new gravitational force?

Science Atoms and Molecules 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

A sonar device on a submarine sends an ultrasound signal into the ocean. The signal reflects off an underwater reef and is detected by the submarine's receiver exactly 2.4 seconds later. If the speed of sound in seawater is 1500 m/s, how far away is the reef from the submarine?

Science Gravitation 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

An element has an atomic number of 13 and a mass number of 27. How many neutrons are present in the nucleus of this atom?

Science Structure of Atom 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal table. What is the net force required to keep the object moving with the same velocity?

Science Force and Laws of Motion 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

The value of the Universal Gravitational Constant (G) was first experimentally determined by:

Science Gravitation 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

A ball is thrown vertically upwards. At the highest point of its trajectory, its velocity and acceleration are:

Science Gravitation 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

The gravitational force between two objects depends on the product of their masses and:

Science Gravitation 0 0 answers 0%
by GIANSH GUPTA KHUNDKER · Class 9

An object weighs 60 N on Earth. What will be its approximate weight on the Moon?

Science Gravitation 0 0 answers 0%

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Frequently Asked Questions

What are the Class 9 Science questions on CREST Ask & Answer?

Multiple-choice questions that CREST students write for other Class 9 students, on topics such as Motion, Force and Laws of Motion, Gravitation. Anyone can answer them free; the student who wrote the question adds the correct option and an explanation.

How do Practice Points work?

Logged-in students earn +1 for answering a question, +3 for asking one, +1 each time someone answers their question and +1 for each upvote; they lose 1 for each downvote. The first five questions on a topic in a class earn a +5 Pioneer bonus. One point is worth a ₹1 discount on Additional Practice purchases. See the rules for asking and answering.

How else can I prepare for the Class 9 CSO exam?

Student questions are good daily practice, but they are not an exam paper. For the real exam pattern, try the Class 9 sample paper and the Class 9 previous year paper, and check the CSO syllabus.

What happens to a wrong or copied question?

Any logged-in student can press Report on a question. Questions that break the rules, such as wrong answers, copied pictures or keyboard mashing, are taken off and the points they earned are taken back.