Half Yearly Class 9 Science Set 3

Time: 3 Hours
Maximum Marks: 80
General Instructions:
(i) The question paper comprises four sections: A, B, C, and D. 
(ii) All questions are compulsory. However, internal choices are provided in some questions. 
(iii) Section A consists of 20 objective type questions (MCQs/Assertion-Reason) carrying 1 mark each. 
(iv) Section B consists of 7 very short answer questions carrying 2 marks each. 
(v) Section C consists of 7 short answer questions carrying 3 marks each. 
(vi) Section D consists of 5 long answer questions carrying 5 marks each.
(vii) Draw neat and labelled diagrams wherever necessary.

Syllabus: The half-yearly question paper is framed from the following chapters: Matter in our surroundings, Is matter around us  pure?, Fundamental unit of life, tissues, Motion, Forces and laws of Motion.

Section A

Q1. The change of a liquid into a gas at any temperature is called:   (1 Mark) 
(a) Boiling
(b) Evaporation
(c) Sublimation
(d) Condensation

Q2. Which of the following is an element?   (1 Mark) 
(a) Water
(b) Air
(c) Oxygen
(d) Salt

Q3. The organelle that controls all cell activities is:   (1 Mark) 
(a) Mitochondria
(b) Nucleus
(c) Ribosome
(d) Lysosome

Q4. Which plant tissue conducts food?   (1 Mark) 
(a) Xylem
(b) Phloem
(c) Sclerenchyma
(d) Collenchyma

Q5. An object moving with constant speed in a straight line has:   (1 Mark) 
(a) Uniform acceleration
(b) Non-uniform acceleration
(c) Zero acceleration
(d) Negative acceleration

Q6. The unit of momentum is:   (1 Mark) 
(a) N
(b) kg m/s
(c) m/s²
(d) J

Q7. Which of the following is a colloid?   (1 Mark) 
(a) Sugar solution
(b) Milk
(c) Salt solution
(d) Pure water

Q8. The organelle that helps in packaging proteins is:   (1 Mark) 
(a) Nucleus
(b) Mitochondria
(c) Golgi apparatus
(d) Lysosome

Q9. The slope of a velocity-time graph gives:   (1 Mark) 
(a) Distance
(b) Displacement
(c) Speed
(d) Acceleration

Q10. Newton's first law of motion is also known as:   (1 Mark) 
(a) Law of acceleration
(b) Law of inertia
(c) Law of action-reaction
(d) Law of momentum

Q11. Assertion (A): Liquids have a definite volume but no definite shape.   (1 Mark) 
Reason (R): Liquid particles are loosely packed and can flow. 
(a) Both A and R are true, and R is the correct explanation of A. 
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Q12. Assertion (A): A compound has a fixed composition.   (1 Mark) 
Reason (R): The components of a compound are chemically combined in a definite ratio. 
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Q13. Assertion (A): Chloroplasts are found only in plant cells.   (1 Mark) 
Reason (R): They contain chlorophyll for photosynthesis. 
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Q14. Assertion (A): Bone is a connective tissue.   (1 Mark) 
Reason (R): It provides structural support to the body. 
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A. 
(c) A is true, but R is false.
(d) A is false, but R is true.

Q15. Assertion (A): A body can have different distances but the same displacement.  (1 Mark)  
Reason (R): Displacement is the shortest distance between initial and final positions. 
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Q16. Assertion (A): Force can change the speed of an object.   (1 Mark) 
Reason (R): Force causes acceleration, which changes velocity. 
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Q17. Which of the following is a physical change?   (1 Mark) 
(a) Cooking of food
(b) Freezing of water
(c) Burning of wood
(d) Rusting of iron

Q18. The function of mitochondria in a cell is to:   (1 Mark) 
(a) Store waste
(b) Produce energy
(c) Synthesize proteins
(d) Control cell division

Q19. A body starts from rest and moves with an acceleration of 5 m/s² for 4 seconds. The distance covered is:   (1 Mark) 
(a) 20 m
(b) 40 m
(c) 60 m
(d) 80 m

Q20. The process used to separate a mixture of sand and water is:   (1 Mark) 
(a) Filtration
(b) Distillation
(c) Centrifugation
(d) Sublimation

Section B

Q1. Define latent heat of vaporization.  (2 Marks) 

Q2.  What is a pure substance? Give one example.  (2 Marks) 

Q3. Name two types of connective tissues in animals.  (2 Marks) 

Q4.  What is the role of sclerenchyma in plants?  (2 Marks) 

Q5. Define acceleration with an example.  (2 Marks) 

Q6.  State Newton's third law of motion.  (2 Marks) 

Q7. What will happen if the apical meristem is damaged or cut?  (2 Marks) 

Section C

Q1. We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. (3 Marks)

Q2.  To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature. (3 Marks) 

Q3. Draw a labelled diagram of a neuron.  (3 Marks) 

Q4.  Differentiate between xylem and phloem in plants (three points).  (3 Marks) 

Q5. Derive the third equation of motion: v² = u²  + 2as.  (3 Marks) 

Q6. When will you say a body is in (i) uniform acceleration? (ii) nonuniform acceleration?  (3 Marks) 

Q7. (Internal Choice)   (3 Marks) 
Option 1:  (i) What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?
(ii)  What can you say about the motion of an object if its speed- time graph is a straight line parallel to the time axis?
Option 2:  Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?

Section D

Q1. (a) Explain the process of freezing and factors affecting it. (3 marks) 
(b) A gas exerts pressure on the walls of the container. Give Reason. (2 marks) 

Q2. (a) Describe the structure and functions of lysosomes in a cell. (3 marks) 
(b) Differentiate between prokaryotic and eukaryotic cells (any four points). (2 marks) 

Q3. (Internal Choice) 
Option 1:  (i)A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because (a) the batsman did not hit the ball hard enough. (b) velocity is proportional to the force exerted on the ball. (c) there is a force on the ball opposing the motion. (d) there is no unbalanced force on the ball, so the ball would want to come to rest. (3 Marks)
(ii) When a carpet is beaten with a stick, dust comes out of it, Explain. (2 Marks)
Option 2: An object of mass 1 kg travelling in a straight line with a velocity of 10 m s-1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

Q4. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body. (5 Marks) 

Q5. Starting from a stationary position, Rahul paddles his bicycle to attain a velocity of 6 m s-1 in 30 s. Then he applies brakes such that the velocity of the bicycle comes down to 4 m s-1 in the next 5 s. Calculate the acceleration of the bicycle in both the cases.  (5 Marks) 

You can access the solutions to this Half Yearly here.