CBSE Class 9 Science Test Papers
Complete Set with Integrated Answers
Matter in Our Surroundings
Is Matter Around Us Pure?
The Fundamental Unit of Life
Tissues (Plant Tissue)
Motion
Force and Laws of Motion
Test Paper 1
Section A: Multiple Choice Questions (1 mark each)
1. Which state of matter has the strongest intermolecular forces?
Answer
A. Solid
Solids have the strongest intermolecular forces which hold particles in a fixed position, giving them a definite shape and volume.
2. A mixture of salt dissolved in water is a:
Answer
C. Solution
Salt water is a homogeneous mixture where salt particles are uniformly distributed in water, making it a true solution.
3. The power house of the cell is:
Answer
B. Mitochondria
Mitochondria produce ATP through cellular respiration, providing energy for cellular activities.
4. Which plant tissue is responsible for growth?
Answer
D. Meristematic
Meristematic tissue contains actively dividing cells responsible for plant growth in length and girth.
5. The SI unit of velocity is:
Answer
A. m/s
Velocity is defined as displacement per unit time, measured in meters per second (m/s).
Test Paper 2
Section A: Multiple Choice Questions (1 mark each)
1. Diffusion is fastest in:
Answer
C. Gases
Gases have the highest kinetic energy and weakest intermolecular forces, allowing fastest diffusion.
2. Tyndall effect is observed in:
Answer
C. Colloids
The Tyndall effect (scattering of light) is characteristic of colloidal solutions where particle size is 1-100 nm.
3. The control center of the cell is:
Answer
B. Nucleus
The nucleus contains genetic material (DNA) and controls all cellular activities.
4. Which tissue provides flexibility to plants?
Answer
C. Collenchyma
Collenchyma provides mechanical support and flexibility to growing parts of plants.
5. Acceleration due to gravity (g) is approximately:
Answer
D. 9.8 m/s²
Standard value of acceleration due to gravity near Earth's surface is 9.8 m/s².
Test Paper 3
Section A: Multiple Choice Questions (1 mark each)
1. Which factor does NOT affect evaporation?
Answer
C. Density of liquid
Evaporation depends on temperature, humidity, wind speed, and surface area—not density.
2. Plasma membranes allow water movement via:
Answer
A. Osmosis
Osmosis is the specific movement of water through a semi-permeable membrane.
Section B: Short Answer Questions (2 marks each)
3. Why does a desert cooler cool better on hot, dry days than hot, humid days?
Answer
On dry days, low humidity allows faster evaporation of water, absorbing more latent heat from surroundings. High humidity slows evaporation, reducing cooling efficiency.
4. State Newton's first law. Why is it called the law of inertia?
Answer
"An object remains at rest or in uniform motion unless acted upon by an unbalanced force." It's called the law of inertia because it describes the resistance of any object to change its state of motion.
Section C: Long Answer Questions (3 marks each)
5. Describe an activity to show particles of matter have space between them.
Answer
Activity:
1. Take a 100ml graduated cylinder and fill it with 50ml water.
2. Add 50g of salt to the water and stir until dissolved.
3. Observe that the water level doesn't rise to 100ml.
Reason: Salt particles occupy the spaces between water molecules, demonstrating intermolecular space.
1. Take a 100ml graduated cylinder and fill it with 50ml water.
2. Add 50g of salt to the water and stir until dissolved.
3. Observe that the water level doesn't rise to 100ml.
Reason: Salt particles occupy the spaces between water molecules, demonstrating intermolecular space.
Test Paper 4
Section A: Diagram-Based Questions (1 mark each)
1. Identify the process: [Diagram: Gas → Cooling → Solid]
Answer
B. Deposition
Deposition is the direct phase change from gas to solid without passing through liquid state.
2. Label parts in plant cell diagram: A (Control center), B (Site of photosynthesis)
Answer
A: Nucleus (controls cell activities), B: Chloroplast (performs photosynthesis)
Section B: Assertion-Reason Questions (2 marks each)
3. Assertion: Steam causes severe burns at 100°C while boiling water does not.
Reason: Steam releases latent heat during condensation.
Reason: Steam releases latent heat during condensation.
Answer
A. Both true; Reason explains Assertion
Steam carries extra latent heat (540 cal/g) that is released during condensation, causing more severe burns than boiling water at the same temperature.
Section C: Numerical (3 marks each)
4. A stone weighs 44 N in air and 32 N in water. Calculate relative density.
Solution:
Loss in weight = Weight in air - Weight in water = 44 N - 32 N = 12 N
Relative density = Weight in air / Loss in weight = 44 / 12 = 3.67
Loss in weight = Weight in air - Weight in water = 44 N - 32 N = 12 N
Relative density = Weight in air / Loss in weight = 44 / 12 = 3.67
Answer
Relative density = 3.67
Test Paper 5
Section A: Case Study (4 marks)
1. Read the experiment: A beaker with ice is heated. Temperature is recorded every minute.
Question: Why does temperature remain at 0°C initially during heating?
Question: Why does temperature remain at 0°C initially during heating?
Answer
The temperature remains constant at 0°C during ice melting because the heat energy is used to overcome intermolecular forces (latent heat of fusion) rather than increasing temperature. This energy breaks hydrogen bonds in ice to form water.
Section B: Practical-Based Questions (3 marks each)
2. Why does a nylon shirt feel hotter than cotton in summer?
Answer
Cotton absorbs sweat and allows evaporation (cooling effect). Nylon is synthetic and non-absorbent, trapping sweat and reducing evaporation, making it feel hotter.
Section C: Advanced Numericals (5 marks)
3. A 0.5 kg ball strikes a wall at 12 m/s and rebounds at 8 m/s. Calculate impulse.
Solution:
Initial velocity (u) = +12 m/s
Final velocity (v) = -8 m/s (rebound direction)
Initial momentum = m × u = 0.5 × 12 = 6 kg·m/s
Final momentum = m × v = 0.5 × (-8) = -4 kg·m/s
Impulse = Change in momentum = Final momentum - Initial momentum
= (-4) - (6) = -10 N·s
Initial velocity (u) = +12 m/s
Final velocity (v) = -8 m/s (rebound direction)
Initial momentum = m × u = 0.5 × 12 = 6 kg·m/s
Final momentum = m × v = 0.5 × (-8) = -4 kg·m/s
Impulse = Change in momentum = Final momentum - Initial momentum
= (-4) - (6) = -10 N·s
Answer
Impulse = -10 N·s (magnitude 10 N·s in opposite direction)
Comments
Post a Comment