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CLASS 9 CBSE SCIENCE
Section A: Short Answer Questions (Q1–30)
Q1. Define inertia. Which physical quantity measures it?
(2 marks)
Q2. State Newton’s third law of motion.
(2 marks)
Q3. What is the difference between mass and weight?
(2 marks)
Q4. Define 1 watt of power.
(2 marks)
Q5. State the universal law of gravitation.
(2 marks)
CLASS 9 CBSE SCIENCE
Section B: Assertion–Reasoning Questions (Q31–50)
Q31. Assertion (A): The displacement of an object can be zero even if the distance covered is not zero.
Reason: Displacement is the shortest path between the initial and final points.
Q32. Assertion (A): An object can have constant speed but variable velocity.
Reason: Velocity is a vector quantity.
Q33. Assertion (A): When a carpet is beaten with a stick, dust comes out of it.
Reason: This is an example of Newton’s first law of motion.
Q34. Assertion (A): The force of friction is always directed opposite to the direction of motion.
Reason: Friction is a self-adjusting force.
Q35. Assertion (A): The value of ‘g’ is the same everywhere on the surface of the Earth.
Reason: ‘g’ depends on the mass of the Earth and its radius.
Q36. Assertion (A): An object has mass, so it must have weight.
Reason: Weight is the force with which the Earth attracts an object.
Q37. Assertion (A): The kinetic energy of a body becomes four times if its velocity is doubled.
Reason: Kinetic energy is directly proportional to the square of the velocity.
Q38. Assertion (A): Work done by the force of gravity on a satellite revolving around the Earth is zero.
Reason: The gravitational force is always perpendicular to the velocity of the satellite.
Q39. Assertion (A): A rocket works on the principle of conservation of momentum.
Reason: For every action, there is an equal and opposite reaction.
Q40. Assertion (A): If the net external force on a body is zero, its momentum is conserved.
Reason: Momentum is the product of mass and velocity.
Q41. Assertion (A): The value of ‘g’ is greater at the poles than at the equator.
Reason: The Earth is flattened at the poles and bulged out at the equator.
Q42. Assertion (A): A ship made of iron floats in water, but an iron nail sinks.
Reason: The buoyant force on the ship is greater than its weight.
Q43. Assertion (A): Power is the rate of doing work.
Reason: The SI unit of power is Joule.
Q44. Assertion (A): When a body is thrown vertically upwards, its velocity is zero at the highest point, but its acceleration is not zero.
Reason: The acceleration is the acceleration due to gravity, which acts downwards.
Q45. Assertion (A): The slope of a velocity-time graph gives acceleration.
Reason: The area under a velocity-time graph gives displacement.
Q46. Assertion (A): An athlete runs some distance before taking a long jump.
Reason: The inertia of motion helps him to jump a longer distance.
Q47. Assertion (A): The momentum of an isolated system of two colliding bodies is conserved.
Reason: The total force on the system is zero according to Newton’s third law.
Q48. Assertion (A): A person feels weightless in a satellite.
Reason: The person is in a state of free fall.
Q49. Assertion (A): When a body is in uniform circular motion, its velocity is not constant.
Reason: The direction of motion changes continuously.
Q50. Assertion (A): The potential energy of a freely falling object decreases progressively.
Reason: This violates the law of conservation of energy.
CLASS 9 CBSE SCIENCE
Section C: Case Study 1 (Q51–54)
Context: A car travels along a straight road. It accelerates from rest to a speed of 20 m/s in 10 seconds. It then travels at a constant speed for the next 20 seconds. Finally, it applies brakes and comes to a stop in 5 seconds.
Q51. What is the acceleration of the car in the first 10 seconds?
(1 mark)
Q52. What is the distance covered by the car while travelling at a constant speed?
(1 mark)
Q53. What is the retardation (negative acceleration) of the car in the last 5 seconds?
(1 mark)
Q54. Calculate the total distance travelled by the car.
(1 mark)
CLASS 9 CBSE SCIENCE
Section C: Case Study 2 (Q55–58)
Context: Two objects, A and B, of masses 2 kg and 3 kg respectively, are moving in the same direction along a straight line. Object A is moving with a velocity of 10 m/s and object B with a velocity of 5 m/s. They collide, and after the collision, object B moves with a velocity of 8 m/s.
Q55. What is the total momentum of the system before the collision?
(1 mark)
Q56. State the law that governs the total momentum of the system.
(1 mark)
Q57. What is the total momentum of the system after the collision?
(1 mark)
Q58. Calculate the velocity of object A after the collision.
(1 mark)
CLASS 9 CBSE SCIENCE
Section C: Case Study 3 (Q59–62)
Context: A stone is thrown vertically upwards with an initial velocity of 40 m/s. Take g = 10 m/s2.
Q59. What is the maximum height reached by the stone?
(1 mark)
Q60. What is the net displacement and the total distance covered by the stone when it returns to the ground?
(1 mark)
Q61. What is the velocity of the stone at the highest point?
(1 mark)
Q62. How long will it take to reach the maximum height?
(1 mark)
CLASS 9 CBSE SCIENCE
Section C: Case Studies 4–6 (Q63–74)
Case Study 4 Context: An object of mass 10 kg is at a certain height above the ground. The potential energy of the object is 490 J. The object is allowed to fall freely. (Take g = 9.8 m/s2)
Q63. Find the height at which the object is present.
(1 mark)
Q64. What is the kinetic energy of the object just as it is about to hit the ground?
(1 mark)
Q65. What is the velocity of the object on touching the ground?
(1 mark)
Q66. What is the kinetic energy of the object when it is at half the initial height?
(1 mark)
Case Study 5 Context: The velocity-time graph of a ball of mass 20 g moving along a straight line on a long table is given. The graph shows velocity in cm/s on the y-axis and time in s on the x-axis. The line connects point (0, 20) to (10, 0).
Q67. What is the initial velocity of the ball?
(1 mark)
Q68. Calculate the acceleration of the ball.
(1 mark)
Q69. How much force does the table exert on the ball to bring it to rest?
(1 mark)
Q70. What is the distance covered by the ball before coming to rest?
(1 mark)
Case Study 6 Context: Archimedes, while taking a bath, discovered a principle related to buoyancy. A body immersed in a fluid experiences an upward force called the buoyant force, equal to the weight of the fluid displaced by it.
Q71. State Archimedes’ principle.
(1 mark)
Q72. Why does a block of plastic released under water come up to the surface?
(1 mark)
Q73. An object of mass 50 g has a volume of 20 cm3. Will the object float or sink in water? (Density of water = 1 g/cm3)
(1 mark)
Q74. What will be the mass of water displaced by this object when fully immersed?
(1 mark)
CLASS 9 CBSE SCIENCE
Section C: Case Studies 7–10 (Q75–94)
Case Study 7 Context: A boy of mass 50 kg runs up a staircase of 45 steps in 9 s. If the height of each step is 15 cm. (Take g = 10 m/s2)
Q75. Calculate the total height climbed by the boy.
(1 mark)
Q76. What is the work done by the boy against gravity?
(1 mark)
Q77. Calculate the power developed by the boy.
(1 mark)
Q78. What form of energy does the boy gain by climbing the stairs?
(1 mark)
Case Study 8 Context: The universal law of gravitation states that every object attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
Q79. Write the mathematical expression for the universal law of gravitation.
(1 mark)
Q80. What is the value and SI unit of the universal gravitational constant (G)?
(1 mark)
Q81. How does the gravitational force change if the distance between two objects is tripled?
(1 mark)
Q82. Why is this force not easily observable between two objects on Earth, like two students sitting on a bench
Class 9 CBSE Science Worksheet
CLASS 9 CBSE SCIENCE
Section D: Numerical Problems (Q95–133)
Q95. A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming uniform acceleration, find the acceleration.
(3 marks)
Q96. A car accelerates uniformly from 18 km/h to 36 km/h in 5 s. Calculate the acceleration and the distance covered.
(3 marks)
Q97. A stone is dropped from the top of a tower 100 m high. Another stone is thrown upwards at 25 m/s. Calculate when and where they meet. (g = 10 m/s2)
(3 marks)
Q98. An object of mass 1 kg travelling at 10 m/s collides with a stationary block of mass 5 kg. Calculate momentum before and after, and velocity of combined object.
(3 marks)
Q99. A bullet of mass 20 g is fired at 150 m/s from a pistol of mass 2 kg. What is the recoil velocity of the pistol?
(3 marks)
Q100. Calculate the force of gravitation between Earth and Sun (mEarth = 6×1024 kg, mSun = 2×1030 kg, distance = 1.5×1011 m).
(3 marks)
Q101. A stone is allowed to fall from a tower 100 m high while another is projected upwards at 25 m/s. Calculate when they meet. (g = 9.8 m/s2)
(3 marks)
Q102. The mass of an object is 10 kg. What is its weight on Earth and on the Moon? (gEarth = 9.8 m/s2, gMoon = 1.63 m/s2)
(3 marks)
Q103. A wooden block of mass 5 kg has dimensions 40 cm × 20 cm × 10 cm. Find pressure exerted when lying on sides (a) 20×10 cm, (b) 40×20 cm. (g = 9.8 m/s2)
(3 marks)
Q104. A 500 g packet has volume 350 cm3. Will it float in water? What is the mass of water displaced?
(3 marks)
Q105. An object of mass 15 kg moves at 4 m/s. Find its kinetic energy.
(3 marks)
Q106. Calculate work required to stop a 1500 kg car moving at 60 km/h.
(3 marks)
Q107. Find energy in kWh consumed in 10 h by four devices of 500 W each.
(3 marks)
Q108. An electric bulb of 60 W is used for 6 h per day. Calculate units consumed in one day.
(3 marks)
Q109. A force acting on a 20 kg mass changes velocity from 5 m/s to 2 m/s. Calculate work done.
(3 marks)
Q110. A bus moving at 54 km/h stops in 8 s. Calculate acceleration and distance travelled before stopping.
(3 marks)
Q111. A racing car has uniform acceleration of 4 m/s2. Find distance covered in 10 s after start.
(3 marks)
Q112. A stone is thrown upwards at 5 m/s. If acceleration is 10 m/s2 downward, find height attained and time taken.
(3 marks)
Q113. A truck of mass 7 tonnes travels 400 m in 20 s with constant acceleration. Find acceleration and force.
(3 marks)
Q114. An object of mass 100 kg accelerates from 5 m/s to 8 m/s in 6 s. Find initial and final momentum, and force exerted.
(3 marks)
Q115. A hammer of mass 500 g moving at 50 m/s stops in 0.01 s. Find force of nail on hammer.
(3 marks)
Q116. Calculate acceleration due to gravity on Moon (Mass = 7.4×1022 kg, Radius = 1740 km).
(3 marks)
Q117. A ball is thrown upwards and returns after 6 s. Find (a) velocity thrown, (b) max height, (c) position after 4 s. (g = 9.8 m/s2)
(3 marks)
Q118. A solid weighs 80 g in air and 64 g in water. Calculate relative density.
(3 marks)
Q119. A sound is heard 5 s after lightning is seen. Find distance of lightning. (Speed of sound = 346 m/s)
(3 marks)
Q120. An object of mass 40 kg is raised to 5 m. Find potential energy. Find kinetic energy halfway down. (g = 10 m/s2)
(3 marks)
Q121. A motor pump of 2 kW raises water to 10 m. How much water per minute? (g = 10 m/s2)
(3 marks)
Q122. A 5 kg body at rest is acted on by 20 N for 10 s. Calculate work done.
(3 marks)
Q123. A car of 1000 kg travelling at 30 m/s stops in 50 m. Find braking force and work done.
(3 marks)
Q124. A girl of mass 40 kg climbs a rope of 6 m in 15 s. Find power expended. (g = 10 m/s2)
(3 marks)
Q125. A train at 90 km/h decelerates at -0.5 m/s2. Find distance before stopping.
(3 marks)
Class 9 CBSE Science Worksheet
CLASS 9 CBSE SCIENCE
Section D: Numerical Problems (Q126–133)
Q126. From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m/s. Calculate the recoil velocity of the rifle.
(3 marks)
Q127. Two objects of masses 100 g and 200 g are moving along the same line with velocities of 2 m/s and 1 m/s. After collision, the first object moves at 1.67 m/s. Determine the velocity of the second object.
(3 marks)
Q128. A man weighs 600 N on Earth. What is his mass? If he is taken to the Moon, his weight becomes 100 N. What is his mass on the Moon? What is the acceleration due to gravity on the Moon? (g on Earth = 10 m/s2)
(3 marks)
Q129. A boat of mass 3000 kg, initially at rest, is pulled by a force of 1.5 × 104 N through a distance of 3 m. Assuming negligible water resistance, calculate the speed of the boat.
(3 marks)
Q130. An object of mass 12 kg is at a certain height above the ground. If its potential energy is 480 J, find the height at which the object is located. (g = 10 m/s2)
(3 marks)
Q131. A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
(3 marks)
Q132. Two girls, each weighing 400 N, climb up a rope through a height of 8 m. Girl A takes 20 s while Girl B takes 50 s. Calculate the power expended by each girl.
(3 marks)
Q133. An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 seconds?
(3 marks)
Class 9 CBSE Science Ultimate Challenge | Paul’s Coaching Global
Box 9: The Ultimate Challenge (Q134–140)
✨ You’ve reached the **Grand Finale**. These questions are designed to stretch your mind, connect concepts, and make you think like a scientist. Completing this section takes your score to 240 and marks you as a true path-breaker!
Q134. Design a real-life experiment to measure acceleration due to gravity using simple materials at home.
(2 marks)
Q135. A CBSE examiner asks: “How does Newton’s third law apply to social situations?” Give one creative analogy.
(2 marks)
Q136. Imagine a world where gravity suddenly doubled. Predict three everyday changes in human life.
(2 marks)
Q137. Work-energy theorem states that work done equals change in kinetic energy. Apply this to explain why athletes train with resistance bands.
(2 marks)
Q138. A rocket is launched from Earth. Explain how conservation of momentum ensures its motion, and suggest one futuristic improvement.
(2 marks)
Q139. Create a cross-disciplinary question linking physics (motion) and biology (human body). Answer briefly.
(2 marks)
Q140. Path-Breaker: “Science is about asking better questions.” Write one original question that connects gravitation and energy, and explain why it matters.
(2 marks)
Motivational Note: If you’ve solved these, you’re not just exam-ready — you’re future-ready. Share this page with friends, and let’s build a global community of thinkers! 🚀
Section D: Numerical Problems (Q95–133)
Q95. A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming uniform acceleration, find the acceleration.
(3 marks)
Q96. A car accelerates uniformly from 18 km/h to 36 km/h in 5 s. Calculate the acceleration and the distance covered.
(3 marks)
Q97. A stone is dropped from the top of a tower 100 m high. Another stone is thrown upwards at 25 m/s. Calculate when and where they meet. (g = 10 m/s2)
(3 marks)
Q98. An object of mass 1 kg travelling at 10 m/s collides with a stationary block of mass 5 kg. Calculate momentum before and after, and velocity of combined object.
(3 marks)
Q99. A bullet of mass 20 g is fired at 150 m/s from a pistol of mass 2 kg. What is the recoil velocity of the pistol?
(3 marks)
Q100. Calculate the force of gravitation between Earth and Sun (mEarth = 6×1024 kg, mSun = 2×1030 kg, distance = 1.5×1011 m).
(3 marks)
Q101. A stone is allowed to fall from a tower 100 m high while another is projected upwards at 25 m/s. Calculate when they meet. (g = 9.8 m/s2)
(3 marks)
Q102. The mass of an object is 10 kg. What is its weight on Earth and on the Moon? (gEarth = 9.8 m/s2, gMoon = 1.63 m/s2)
(3 marks)
Q103. A wooden block of mass 5 kg has dimensions 40 cm × 20 cm × 10 cm. Find pressure exerted when lying on sides (a) 20×10 cm, (b) 40×20 cm. (g = 9.8 m/s2)
(3 marks)
Q104. A 500 g packet has volume 350 cm3. Will it float in water? What is the mass of water displaced?
(3 marks)
Q105. An object of mass 15 kg moves at 4 m/s. Find its kinetic energy.
(3 marks)
Q106. Calculate work required to stop a 1500 kg car moving at 60 km/h.
(3 marks)
Q107. Find energy in kWh consumed in 10 h by four devices of 500 W each.
(3 marks)
Q108. An electric bulb of 60 W is used for 6 h per day. Calculate units consumed in one day.
(3 marks)
Q109. A force acting on a 20 kg mass changes velocity from 5 m/s to 2 m/s. Calculate work done.
(3 marks)
Q110. A bus moving at 54 km/h stops in 8 s. Calculate acceleration and distance travelled before stopping.
(3 marks)
Q111. A racing car has uniform acceleration of 4 m/s2. Find distance covered in 10 s after start.
(3 marks)
Q112. A stone is thrown upwards at 5 m/s. If acceleration is 10 m/s2 downward, find height attained and time taken.
(3 marks)
Q113. A truck of mass 7 tonnes travels 400 m in 20 s with constant acceleration. Find acceleration and force.
(3 marks)
Q114. An object of mass 100 kg accelerates from 5 m/s to 8 m/s in 6 s. Find initial and final momentum, and force exerted.
(3 marks)
Q115. A hammer of mass 500 g moving at 50 m/s stops in 0.01 s. Find force of nail on hammer.
(3 marks)
Q116. Calculate acceleration due to gravity on Moon (Mass = 7.4×1022 kg, Radius = 1740 km).
(3 marks)
Q117. A ball is thrown upwards and returns after 6 s. Find (a) velocity thrown, (b) max height, (c) position after 4 s. (g = 9.8 m/s2)
(3 marks)
Q118. A solid weighs 80 g in air and 64 g in water. Calculate relative density.
(3 marks)
Q119. A sound is heard 5 s after lightning is seen. Find distance of lightning. (Speed of sound = 346 m/s)
(3 marks)
Q120. An object of mass 40 kg is raised to 5 m. Find potential energy. Find kinetic energy halfway down. (g = 10 m/s2)
(3 marks)
Q121. A motor pump of 2 kW raises water to 10 m. How much water per minute? (g = 10 m/s2)
(3 marks)
Q122. A 5 kg body at rest is acted on by 20 N for 10 s. Calculate work done.
(3 marks)
Q123. A car of 1000 kg travelling at 30 m/s stops in 50 m. Find braking force and work done.
(3 marks)
Q124. A girl of mass 40 kg climbs a rope of 6 m in 15 s. Find power expended. (g = 10 m/s2)
(3 marks)
Q125. A train at 90 km/h decelerates at -0.5 m/s2. Find distance before stopping.
(3 marks)
CLASS 9 CBSE SCIENCE
Section D: Numerical Problems (Q126–133)
Q126. From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m/s. Calculate the recoil velocity of the rifle.
(3 marks)
Q127. Two objects of masses 100 g and 200 g are moving along the same line with velocities of 2 m/s and 1 m/s. After collision, the first object moves at 1.67 m/s. Determine the velocity of the second object.
(3 marks)
Q128. A man weighs 600 N on Earth. What is his mass? If he is taken to the Moon, his weight becomes 100 N. What is his mass on the Moon? What is the acceleration due to gravity on the Moon? (g on Earth = 10 m/s2)
(3 marks)
Q129. A boat of mass 3000 kg, initially at rest, is pulled by a force of 1.5 × 104 N through a distance of 3 m. Assuming negligible water resistance, calculate the speed of the boat.
(3 marks)
Q130. An object of mass 12 kg is at a certain height above the ground. If its potential energy is 480 J, find the height at which the object is located. (g = 10 m/s2)
(3 marks)
Q131. A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
(3 marks)
Q132. Two girls, each weighing 400 N, climb up a rope through a height of 8 m. Girl A takes 20 s while Girl B takes 50 s. Calculate the power expended by each girl.
(3 marks)
Q133. An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 seconds?
(3 marks)
Box 9: The Ultimate Challenge (Q134–140)
✨ You’ve reached the **Grand Finale**. These questions are designed to stretch your mind, connect concepts, and make you think like a scientist. Completing this section takes your score to 240 and marks you as a true path-breaker!
Q134. Design a real-life experiment to measure acceleration due to gravity using simple materials at home.
(2 marks)
Q135. A CBSE examiner asks: “How does Newton’s third law apply to social situations?” Give one creative analogy.
(2 marks)
Q136. Imagine a world where gravity suddenly doubled. Predict three everyday changes in human life.
(2 marks)
Q137. Work-energy theorem states that work done equals change in kinetic energy. Apply this to explain why athletes train with resistance bands.
(2 marks)
Q138. A rocket is launched from Earth. Explain how conservation of momentum ensures its motion, and suggest one futuristic improvement.
(2 marks)
Q139. Create a cross-disciplinary question linking physics (motion) and biology (human body). Answer briefly.
(2 marks)
Q140. Path-Breaker: “Science is about asking better questions.” Write one original question that connects gravitation and energy, and explain why it matters.
(2 marks)
Motivational Note: If you’ve solved these, you’re not just exam-ready — you’re future-ready. Share this page with friends, and let’s build a global community of thinkers! 🚀