State level SSLC preparatory Exam - 1 (2026) Science - Key Answer

     PART - A (PHYSICS)     

  I. Multiple choice questions:   2×1=2

1. The SI unit of potential difference

(A) volt (B) Ampere (C) coulomb (D) ohm metre

Ans: (A) volt

2. Correct statement with respect to magnetic field in the given diagram is,

(C → Current-carrying solenoid, P and Q → Points inside the solenoid,R→ Point outside the solenoid) The magnetic field

(A) in P is more than in Q

(B) in Q is more than in P

(C) in R is more than in P and in O

(D) in P and in Q is equal.

Ans: (D) in P and in Q is equal.

   II. Answer the following questions: 2×1=2

3. In the given diagram, which angle is bigger among the angles r1, and r2? Give a reason.

Ans:

★ Angle r2 is larger.

★ Because light speeds up and bends away from the normal line when exiting the glass into the air.

4. Write the diagrams of the symbols of the following components used in an electric circuit:

i) Rheostat or variable resistance

ii) Wire crossing without joining.

Ans:

   III. Answer the following questions: 3x 2=6

5. Observe the below given diagram of the human eye. Name the eye defect indicated in this diagram and mention the lens used to correct this defect.

Ans:

★ Myopia / Near sightedness

★ Concave lens

6. Observe the given diagram and calculate the total resistance in the given electric circuit.

Ans:

Rs = R1 + R2 + R3

Rs = 15Ω + 5Ω + 5Ω = 25

Rs = R4 + R5

Rs = 20Ω + 30Ω = 50Ω

R6 = 25ΩΩ

Total resistance:

1/ Rp = 1/25Ω + 1/50Ω + 1/25Ω

Rp = 10Ω

7. Mention any four properties of magnetic field lines.

Ans:

★ Magnetic field lines have both magnitude and direction. 

★ Magnetic field lines emerge from north pole and merge into south pole. 

★ Are closed curves. 

★ Magnetic field lines do not intersect each other. 

★ Magnetic field is strong wherever the density of field lines is more./Magnetic field lines are closely packed where the field is strong.    (Any four)

OR

What precautionary measures have to be taken to avoid overload in domestic electric circuit?

Ans:

★ Fuse should be used in the electric circuit 

★ Should avoid the direct contact of live wire and neutral wire. 

★ Avoid the damage of insulation of wires 

★ Should repair any faults in the electrical appliances 

★ Should not connect too many appliances to a single socket. (Any four)

  IV. Answer the following questions: 3x3=9

8. Explain the activity of drawing magnetic field lines around a bar magnet using a compass needle.

Ans:

★ Place the bar magnet on a white paper and mark the boundary of the magnet.

 

★ Place the compass needle near the North pole of the magnet. Its South pole turns towards the North pole. The North pole of the compass needle is directed away from the North pole of the magnet.  

★ Mark the position of two ends of the needle.  

★ Now move the needle to a new position such that its South pole occupies the position previously occupied by its North pole.  

★ In this way, proceed step by step till you reach the South pole of the magnet. Join the points marked on the paper by a smooth curve. This curve represents a field line.  

★ If two field lines cross each other, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible. 

9. Draw the ray diagram for the image formation when an object is placed between 2F1 and F1 of a convex lens. Mention the nature of the image formed. [ F1 : Principal focus of the lens. ]

Ans:

Nature of the image : Real and Inverted

10. Explain the phenomenon of formation of the rainbow in the atmosphere.

Ans:

★ Rainbow is caused by the dispersion of sunlight by tiny water droplets present in the atmosphere.

★ The water droplets act like small prisms; they refract and disperse the incident sunlight. then reflect it internally and finally refract it again when it comes out of the raindrop.

★ Due to the dispersion of light and internal reflection, different colours reach the observer’s eye.

OR

Explain Newton’s experiment that shows the recombination of spectrum of white light.

Ans:

★ Newton used a glass prism to obtain the spectrum of white light. 

★ When he placed a second identical prism in an inverted position with respect to the first prism and allowed the spectrum to pass through it, a beam of white light emerges. 

★ This shows the recombination of spectrum of white light.

  IV. Answer the following questions: 2 x 4=8

11. a) What is magnification? If the magnification of an image produced by a lens is + 2, then mention the type of the lens.

b) The refractive index of medium A is less than that of medium B. Which of these media is optically denser ? In which of these media the speed of light is more ? 

Ans:

a)

★ Magnification is the ratio of the size of an image to the size of an object.

★ Convex lens

b)

★ Medium B is denser medium

★  Medium A 

OR

a) What is centre of curvature of a spherical mirror ? Write any two uses of concave mirror.

b) State the laws of refraction of light.

Ans:

a)

★ The centre of the sphere from which the mirror is a part.

Uses of concave mirror :

★ To obtain a parallel beam of light in torches

★ Shaving mirror.

★ Dentists use concave mirror to obtain a large image of the teeth.

★ Used in solar furnaces to concentrate sunrays

b)

Laws of refraction of light : 

★ 1st Law : The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. 

★ 2nd law : The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media. /

sini / sinr = constant. 

12. a) List the factors on which the resistance of a conductor depends.

b) Write the mathematical form of Joule’s law of heating. Name any two devices that work on the basis of Joule’s law of heating.

Ans :

a)

★ its length

★ Area of cross section

★ Nature of the conductor

★ Temperature

b)

★ H = I2Rt

The devices that work on this law are

★ Electric Toaster

★ Electric Oven

★ Electric Kettle

★ Electric Bulb

★ Electric Fuse       ( Any two )

     PART - B (CHEMISTRY)     

   VI. Multiple choice questions:  2 x 4=8

13. The type of chemical reaction in which reactants exchange their ions is

(A) Double displacement

(B) Displacement

(C) Decomposition

(D) Combination

Ans: (A) Double displacement

14. The green coloured compound that is formed when copper reacts with carbon dioxide of the moist air is

(A) Copper carbonate

(B) copper sulphide

(C) copper nitrate

(D) copper oxide

Ans: (A) Copper carbonate

15. The property of carbon that is responsible for producing large molecules is

(A) Tetravalency     (B)  Catenation

(C) inflammability  (D) Allotropism

Ans:  (B)  Catenation

   VII. Answer the following questions: 3x1=3

16. The pH values of four solutions are given in the following table. In these

a) Which solution has more concentration of H+ ions?

b) Name the neutral solution.

Ans:

a) Solution Q

b) Solution P

17. What is the importance of hydrogenation of carbon compounds ?

Ans:

★ Unsaturated carbon compounds can be converted into saturated

carbon compounds.

★ More reactive fats can be converted into less reactive fats.

★ The shelf life of carbon compounds (fatty acids) can be increased. (Any two)

18. Magnesium and Manganese metals are reacted with a strong oxidising acid. With which of these metals is the evolution of gas bubbles faster?

Ans: Magnesium.

   VIII. Answer the following questions : 3x2=6 

19. Draw the diagram of the arrangement of apparatus used to show the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning.

Ans:

20. Give reasons :

i) Covalent compounds have low melting points and boiling points. 

ii) Carbon does not form either C4 − or C4 + ions.

Ans:

i) because they are held together by weak intermolecular forces

ii) 

★ Carbon cannot form C4+ cation because of removal of 4 elections from a carbon atom would require a large amount of energy.

★ Carbon cannot form C4- anion because it would be difficult for the nucleus with 6 protons to hold on to 10 electrons.

21. Draw the diagram of the arrangement of the apparatus used to show the action of steam on metal.

Ans:

   IX. Answer the following questions : 3x3=9 

22. Balance the following chemical equations :

i) AgC l → Ag + Cl2

ii) Fe + H2O → Fe3O4+H2

iii) N2 + H2 → NH3

Ans:

i) 2AgCl → 2Ag + Cl2

ii) 3Fe + 4H2O → Fe3O4 + 4H2

iii) N2 + 3H2 → 2NH3

OR

i) What are redox reactions ?

ii) CuO + H 2 → Cu + H 2 O. Identify the substance oxidised and the substance reduced in this equation.

iii) What is the difference between endothermic and exothermic reactions?

Ans:

i) A chemical reaction in which one reactant gets oxidised while the other gets reduced is called redox reaction.

ii) CuO is Reduced, H2 is Oxidised

iii)

★ Endothermic reaction : Reactions in which heat is absorbed

★ Exothermic reaction: Reactions in which heat is liberated

23. Explain the formation of sodium chloride molecule by the transfer of electrons.

OR

a) Aluminium oxide is called an amphoteric oxide. Why?

b) How calcination process differs from roasting?

Ans :

a) Aluminium oxide reacts both acid and base to give salt and water.

b)

★ Calcination: Carbonate ores are converted into oxides by heating strongly in limited air.

★ Roasting : Sulphide ores are converted into oxides by heating strongly in the presence of excess of air.

24. a) What is acid rain?

b) Which gas liberates when an acid reacts with a metal carbonate? 

c) Write the chemical name and molecular formula of baking soda.

Ans :

a) When pH of rain water is less than 5.6, it is called acid rain

b) Carbon dioxide

c) 

★ Sodium hydrogen carbonates/ Sodium bicarbonate

★ NaHCO3

   X. Answer the following question : 1x4=4

25. a) Write the structure of n-butane and isobutane.

b) What is esterification? How ethene is obtained from ethanol ?

Ans :

b) 

★Alcohol and carboxylic acid react to form an ester. The reaction is called esterification reaction.

★ When ethanol is heated at 443 K with excess concentrated sulphuric acid, ethanol undergoes dehydration to form ethene.

OR

a) Write the electron dot structure of nitrogen and methane molecules.

b) Explain the cleaning action of soap.

Ans:

a)

Nitrogen:

Methane:

b)

★ The molecule of soaps are sodium or potassium salts of long chain carboxylic acids. 

★ Ionic end of soap interacts with water while the carbon chain interacts with oil

★ Soap molecule thus forms a structure called micelle. This forms an emulsion in water. 

★ The micelles thus help in pulling out the dirt in water.

     PART - C (BIOLOGY)     

   XI. Multiple choice questions.    3×1 = 3

26. The process of producing the new progenies in rhizopus is

(A) spore formation

(B  vegetative propagation

(C) binary fission

(D) regeneration

Ans : A) spore formation

27. An incorrect statement related to the transpiration among the following is ;this process

(A) Creates osmotic pressure for the movement of food molecules

(B) Helps in the absorption and movement of salts from the roots

(C) Creates suction force for the movement of water molecules

(D) Balances water level in a plant body

Ans: (A) Creates osmotic pressure for the movement of food molecules

28. the sequential stages that occur in the sexual reproduction of flowering plants are

(A) pollination, fertilization, seed, embryo

(B) seed, embryo, fertilization, pollination

(C) embryo, seed, pollination, fertilization

(D) pollination, fertilization, embryo, seed

Ans : (D) pollination, fertilization, embryo, seed

   XII. Answer the following questions :   3×1 = 3

29. Draw the diagram to show the structure of open stomata.

Ans:

30. How is the sex of a male child determined in humans?

Ans: If zygote received Y chromosome from the father then the zygote develops into a male child.

31. Observe the tropisms of plants expressed in the following figures A and B. What is the difference between the movements of these plants?

Ans:

Plant A : Nastic moment

Plant B : Trophic moment

   XIII. Answer the following questions :  2×2 = 4

32. What are the differences between arteries and veins ?

Ans:

Arteries:

★ Arteries carry blood away from the heart to various organs of the body.

★ are thick walled blood vessels

★ Veins have no valves

Veins:

★ Veins carry the blood from different organs and bring it back to the heart

★ are thin walled blood vessels

★ Veins have valves           (Any two)

OR

Write the differences between aerobic respiration and anaerobic respiration.

Ans:

Aerobic respiration 

★  It takes place in the presence of O2 

★  Energy released is more 

★  Produce carbon dioxide, water, and energy 

Anaerobic respiration

★  It takes place in the absence of O2. 

★  Energy released is less

★  Produce ethanol, carbon dioxide and energy.   (Any two)

33. We pull out our foot back when we step on a thorn without realizing. Write the sequence of the events that occur in this process.

Ans :

Receptors in skin/ Receptors → sensory neuron → spinal cord → relay neuron → motor neuron → muscle in leg / effector.

   XIV. Answer the following questions :   3×3 = 9

34. Draw the diagram to show the structure of human brain and label the following parts : i) Cerebrum ii) Hypothalamus.

Ans:

35. A pure tall pea plant ( TT ) is crossed with a pure dwarf pea plant ( tt ). Express the result obtained in F2 generation with the help of checker board and mention the ratio of the types of plants.

Ans:

Phenotypic ratio : 3 : 1

3 : Tall plants

1 : dwarf plants

36. grass → Grasshopper → Frog → Snake : In this food chain.

i) Which organism has more deposition of harmful chemicals?

ii) Does the energy from the frog return to the grass-hopper? Clarify your answer.

Ans:

i) Snake

ii) 

★  No

★  The flow of energy in the food chain is unidirectional.

OR

Give reasons :

a) Production of CFC free refrigerators is compulsory.

b) Plastics remain for long period in the environment.

Ans:

a) CFC’s are responsible for the decrease in the amount of ozone layer

b) 

★ Plastics are non – biodegradable 

★ It cannot be degraded by microbes.

   XV. Answer the following question : 1×4 = 4

37. a) What t is emulsification of fats?

b) Write the events that occur during photosynthesis in plants.

Ans :

a) The process of breakdown of larger fat droplets into smaller droplets of fat with the help of bile salts present in bile juice

b) 

Event occurs during photosynthesis

★ Absorption of light energy by chlorophyll.

★ Conversion of light energy to chemical energy. Breaking of water molecules into hydrogen and oxygen.

★ Reduction of carbon dioxide to carbohydrates.

    XVI. Answer the following question : 1×5 = 5

38. a) Explain the process of development of an egg into a foetus in human female reproductive system.

b) What are sexually transmitted diseases? Write any two examples.

Ans :

a)

★ The zygote divides and becomes an embryo.

★ The embryo is implanted in the lining of the uterus.

★ The embryo continues to grow and develop organs to become foetus.

b) 

★ The disease caused by unsafe sexual contact.

★ Bacterial: Gonorrhoea and syphilis

★ Viral: Warts and HIV-AIDS

OR

a) What is asexual reproduction? What are the differences between fragmentation and fission?

b) Mention the advantages of vegetative propagation.

Ans : 

a) 

★ New individual produced by single parent / Production of young ones without fusion of gametes. 

Fragmentation

 ★The organism breaks-up into smaller pieces upon maturation, each piece develops into new individual

★ E.g., Spirogyra

Fission

★ The parent cell divides into two or more daughter cells.

★ E.g., Amoeba

b) 

Advantages 

★ Plants are genetically similar to the parent plant.

★ it can be used to grow plants that don't produce viable seeds, such as bananas, roses, and pineapples.

★ Plants raised by vegetative propagation can bear flowers and fruits earlier.

(Any two)

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