SEE Practice Model Set 1[EWA0B1C2D3]
Time: 3 hours Full Marks: 75
All the questions are compulsory.
Section ‘A’ (Multiple Choice Questions). (10×1=10)
1. Write the best alternative to the following questions in the answer sheet( Your own copy).
a. Which of the following is the first stage towards a signal receiver? (K)
i. Decoder
ii. Encoder
III. Demodulator
IV. Modulator
Correct Answer: iii. Demodulator
b. Why is Cycas kept in gymnosperms?
i. It bears flowers and produces seed.
ii. It bears flowers and has pointed leaves.
iii. It has a cone instead of a flower, and a seed is present inside the fruit.
iv. It has a cone instead of a flower, and the seed is naked.
Correct answer: iv. It has a cone instead of a flower, and the seed is naked
c. When Sanju observed the specimens in the laboratory, she found that both of the organisms are long and cylindrical. She also found that organism A has a cylindrical segmented body, and organism B has no segmented body. By studying the above characteristics, which statement is true for these organisms? (A)
i. Organism A is hermaphrodite, whereas organism B is unisexual.
ii. Organism A is unisexual, whereas organism B is hermaphrodite.
iii. Orɡanism A is diploblastic, whereas organism B is triploblastic.
iv. Organism A is triploblastic, whereas orɡanism B organism is diploblastic.
Correct answer: I. Organism A is unisexual, whereas organism B is hermaphrodite.
d. Cordyceps, formed by the fusion of a caterpillar and fungi, is shown in the figure. What is the interrelation between the caterpillar and the fungus in this process? (U)
i. Symbiotic
ii. Parasitic
iii. Saprotrophic
iv. Commensalism
e. What would be the acceleration due to gravity of the meteor falling from 10000 km height from the centre? (A)
I. 4.2 m/s²
ii. 4.002 m/s²
iii. 4 m/s²
iv. 4.02 m/s²
f. Why is swimming in seawater easier than in a river? (U)
I. The density of seawater is more than that of the river.
ii. The density of seawater is less than that of the river.
iii. The temperature of the seawater is more than that
iv. The temperature of the seawater is less than that of the river.
g. Sarthak named red, green, violet and blue coloured rays in dispersion of speed in the prism as Vr, Vg, Vv, and Vb respectively. Which is the correct order of a speed named by him? (HA)
I. Vg<Vb>Vr<Vv
ii. Vr> Vy> Vb< Vv
iii. Vg< Vy< Vr >Vv
iv. Vr < Vy > Vr < Vv
h. What is the most realistic theory about the origin of the universe? (K)
I. Heliocentric theory
ii. Geocentric theory
iii. Newton’s theory
iv. Big Bang theory
I. What is denoted by X in the given reaction? (U)
KClO₃🔜 X,heat➡️ 2KCl + 3O₂
i. Catalyst
ii. Heat
iii. Pressure
iv. Light
j. A statement and two arguments are given below. Statement: Stomach pesticide is a type of pesticide based on the mode of action. (HA)
Argument 1: In this process, the insects die when they eat leaves and fruits of the plants treated with pesticides.
Argument 2: When these pesticides come into contact with the air, poisonous gases are released, due to which the insects die.
I. Statement and argument 2 are correct, but argument 1 is incorrect.
ii. Statement and argument 2 are incorrect, but argument 1 is correct.
iii. Statement and argument 1 are correct, but argument 2 is incorrect.
iv. Statement and argument 1 is incorrect, but argument 2 is correct.
Section ‘B’ (9×1=9)
2. Very short answer questions.
a. Write an advantage of the independent variable.
Answer: It allows the researcher to directly manipulate a specific factor to observe its exact effect on a result.
Answer: It allows the researcher to directly manipulate a specific factor to observe its exact effect on a result.
b. What is upthrust?
c. Write down one utility of optical fibre.
d. In the summer season, the cemented roads seem to be filled with water, but they are not actually. Which phenomenon of light is behind this?
e. What happens when carbon dioxide gas is passed through lime water for a short time?
f. What is red shift?
g. Write the name of the main ore of silver.
h. Why are group VII elements of the periodic table called halogens?
I. Write the structural formula of glycol.
Section ‘C’. (14×2=28)
Short answer type questions.
3. Prove that the unit of potential difference is V=kgm2s-³A-¹.
4. Write any two characteristics of gymnosperms.
5. Which process is represented by A and B?
Drone Bee ➡️A ➡️Honey Bee ➡️ B🔜 Fertile Queen Bee
6. Write any two differences between a diploid cell and a haploid cell.
7. In which two conditions does in vitro fertilisation help with reproduction in women?
8. Valves are present in veins but not in arteries. Why?
9. Study the given figure alongside. Figa Write the importance of a plant given in Figure (a). Which part of the plant given in Figure (b) is more useful?
10. Give any two examples of free fall.
11. A body is dropped from the top of the tower of height ‘h’, and at the same time, the next body is thrown up from the bottom of the tower with a velocity of 20 m/s. If these bodies meet after 2 seconds at a point of the tower, calculate the height of the tower. (g=10m/s²)
12. Write an application of a step-up transformer and a step-down transformer each.
13. The coil of the AC generator is shown in the diagram. Write any two ways of increasing the amount of induced electromotive force.
14. Suppose an equal volume of hydrogen peroxide is kept in conical flasks P and Q. If some amount of manganese dioxide(MnO₂) and phosphoric acid(H₃PO₄) are kept in P and Q, respectively, in which conical flask is the rate of chemical reaction faster? Write t with reason.
15. A hydrocarbon compound ‘A’ is used to preserve biological specimens, and the next hydrocarbon ‘B’ is used as a sweetening agent in confectionery. Answer the following questions.
i. Write down the IUPAC name of compound ‘A’.
ii. Write the structural formula of compound ‘B’.
16. Write any two applications of Calamus in daily life.
Section ‘D’ (7X4=28)
Write a long answer.
17. Nowadays, Facebook Messenger is also used to talk to friends through social media.
a. Write the names of the other two applications used, like Messenger.
b. How do you apply these applications to improve your study? Write in two points.
18. Artificial insemination (AI) and in vitro fertilisation are both assisted reproductive technologies. Based on this fact, answer the following questions.
a. “AI technology has helped to bring happiness to the farmer”. Justify the statement with your two opinions.
b. “IVF is proven to be a boon for childless couples”. Present two reasons to prove this statement.
19. Write any four functions of plasma.
20. Water is used to cool the heated engine of the truck. Why? Aakriti took 3 buckets named A, B, and C. She kept 88 degrees Celsius hot 12 kg of water in bucket A and 13 degrees Celsius hot 24 kg of water in bucket B. She mixed them and kept them in bucket C. What is the final temperature of water in bucket C? (Given that 4200J/kg ⁰C and neglecting the heat taken by the bucket)
21. The schematic ray diagram of a convex lens is given. Study the diagram and answer the following questions.
i. Complete the diagram given alongside to form the image of the object PQ.
ii. Write any two characteristics of the image formed from it.
iii. Name a device in which this ray diagram of a lens is used, and also write an application of this device.
22. Write the answer to the following questions.
I. Name of the element having electronic configuration as 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹.
ii. Name of an alkali metal other than sodium.
iii. Name of a metalloid other than silicon. iv. Name of an alkaline earth metal other than magnesium.
23. Draw a well-labelled diagram of the laboratory preparation of ammonia gas and write down a method to test the gas.
“Best of Luck”