class IX Science P.A. 1

                                                                        CLASS IX

                                                               SUBJECT-SCIENCE 

   SECTION A

Q1. The order of intermolecular forces of attraction of three substances P, Q, R is Q>P

       and R<P. Which of them is most likely to be fluid/s?

       A. O        B. P and R     C. P and Q           D.R

Q2. The barrier between the protoplasm and the outer environment in an animal

       cell is

A. Cell wall      B. Plasma membrane        C. Nuclear membrane       D. Cytoplasm

Q3. If an object moves with a constant speed in a straight line, what is its acceleration?

      A. Zcro     B. Positive     C. Negative      D. Constant

acceleration.

D. Decreasing speed, constant acceleration.

Q4-What does a horizontal line on a distance-time graph and on a velocity-time

gruph indicate?

A. Constant speed, object at rest.

B. Inereasing speed, zero acceleration.

C. Stationary object, zeroacceration

D. decreasing speed,constant acceration.

Following questions consist of two statements: assertion (A) and reason (R)

Answer these questions selecting the appropriate option given below

(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

Q5. Assertion: Displacement of an object may be zero even if the distance covered by

it is not zero.

Reason: Displacement is the shortest distance between the initial and final position.

Q6. Assertion: A plant cell bursts if placed in water. 

Reason: High turgor pressure causes bursting of animal  cells.

SECTION B

Q7. A cyclist moving along a circular path of a radius of 63 m completes three rounds

in 3 minutes. Calculate: (a) Total distance covered (b) Net displacement.

Q8) Vasu was helping his mother in laying the table when they had some guest

for dinner. Vasu was about to sprinkle salt on salad for dressing. His mother stopped him

from doing so and told him that it is too early to sprinkle salt on the salad, he should do so

only when they are seated for having the dinner.

(a) What would happen if salt is sprinkled on the salad?

(b) Which property of cells is seen in adding salt to it?

Q9. Draw a neat diagram of the prokaryotic cell. Name the nuclear region in it and label

it in the diagram.

  SECTION C

Q10. A car travels a distance of 150 km at a speed of 50 km per hour. After covering this

distance, the car continues to travel for another 2 hours at a speed of 60 km per hour.

Calculate the average speed and the average velocity for the entire journey.

011. Differentiate between solid, liquid & gas in a tabular form on the basis of:

A. Intermolecular force of attraction.

B. Shape

C. Density

                                                         OR

A. How are temperature in the Celsius and Kelvin scale related to each other?

B. Convert:    (i) 375 K to C            (ii) 37°C to K

C. What will be the state of water at:

(i) 108 °C        (ii) 273 K

Q12. A. What is plasmolysis?

        B. Why does plasmolysis not take place in animal cell?

                                         OR

A. How does amoeba acquire its food? Name the process.

B. "Amoeba is an example of eukaryotic organism".

Support the above statement with a prominent reason.

               SECTION D

Q13 (A) Give the two functions of nucleus.

        (B) What is the difference in chromatin, chromosomes and gene?

Q14. Account for the following:

A. When salt crystals dissolve in water, the level of water does not change.

B. Milk should be called a liquid. (2 reasons)

C. Naphthalene balls disappear with time without leaving any residue.

D. Temperature of a substance remain constant during change of state.

E. Solid carbon dioxide is called dry ice.

Q15.A. When do the distance and displacement of a moving object have the same magnitude?

         B.What is the purpose of a speedometer in a car?

                                  SECTION E

Q16. Sahil took two beakers, A and B containing hot and cold water respectively. In (4)

         each beaker he dropped a crystal of potassium permanganate and kept them undisturbed.

        After some time, he observed that the water in beaker A turned purple faster in

       comparison to beaker B.

A. Give any one characteristic feature of matter which you can conclude from this

experiment.

B. Define diffusion.

C. Enlist two factors affecting diffusion and state how they affect the rate of diffusion.

                                        OR

C. Justify the observation seen in beaker A.