TS 10th Class Physical Science Question Paper June 2025

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TS 10th Class Physical Science Question Paper June 2025

Parts – A and B

Time: 1 Hour 30 min.
Max. Marks: 40

Instructions :

1. Read the question paper and understand every question thoroughly and write answers in given 1 hr. 30 min. time.
2. 3 very short answer questions are there in section -1. Each question carries 2 marks. Answer all the questions. Write answer to each question in 3 to 4 sentences.
3. 3 short answer questions are there in section – II. Each question carries 4 marks. Answer all the questions. Write answer to each question in 5 to 6 sentences.
4. 3 essay type answer questions are there in section – III. Each question carries 6 marks. Answer any two questions. Write answer to each question in 8 to 10 sentences.

Part – A
Section – I (3 × 2 = 6 M)

Time: 1.15 hrs.
Marks: 30

Instructions :
i) 3 Very short answer questions are there in this Section – I.
ii) Anwer all the questions. Each question carries 2 marks.
iii) Write answer to each question in 3 to 4 sentences.

Question 1.
Write any two uses of concave mirror.
Answer:
1. Concave mirrors are used as dentist mirrors.
2. They are used as shaving mirrors.
3. They are used as reflectors in headlights.
4. They are used in solar cookers.

Question 2.
Show the formation of N₂ molecule with a diagram according to valence bond theory.
Answer:

1. Electronic configuration of Nitrogen is 1s² 2s² 2px_x¹ 2py_y1 2p^z1.
2. Suppose that p_x orbital of one Nitrogen atom overlaps the p_x orbital of other ‘N’ atom giving CT p_x – p_x bond along the inter nuclear axis.
3. The p_y and p_z orbitals of one ‘N’ atom overlap with the p_y and p_z orbital of other ‘N’ atom laterally giving π p_y – p_y and π p_z – p_z bonds.
4. Therefore, N, molecule has a triple bond between two Nitrogen atoms.

Question 3.
What happens if the magnetic field cannot apply force on current carrying wire?
Answer:

1. If a magnetic field cannot apply force on a current-carrying wire, then the wire will not experi-ence any push or pull from the magnetic field.
2. This happens when the wire is placed parallel to the magnetic field.
3. So, no force i created ;
4. As a result, the wire will stay in its original position without moving.

Section – II (3 × 4 = 12)

Instructions:
i) 3 Short answer question are there in this Section – II.
ii) Answer all the questions. Each question carries 4 marks.
iii) Write answer to each question in 5 to 6 sentences.

Question 4.
Write any four uses of bleaching powder.
Answer:
Uses of Bleaching powder:

1. It is used for bleaching cotton and linen in the textile industry.
2. It is used for bleaching wood pulp in paper industry.
3. It is used for bleaching washed clothes in laundry.
4. Used as an oxidizing agent in many chemical industries.
5. Used for disinfecting drinking water to make it free of germs.
6. Used as a reagent in the preparation of chloroform.

Question 5.
Show the dispersion of sunlight due to a rain drop with a diagram.
Answer:
Dispersion phenomenon occurs in the daily life in the formation of Rainbow.

1. Rainbow : The rainbow is an arch of seven colours visible in the sky which is produced by the dispersion of sun’s light by raindrops in the atmosphere.
2. Observe the figure. The rays of sunlight enter the drop near its top surface.
3. At this first refraction, the white light is dispersed into its spectrum of colours, violet being deviated the most and red the least.
4. Reaching the opposite side of the drop, each colour is reflected back into the drop because of total internal reflection.
5. Arriving at the surface of the drop, each colour is again refracted into air..
6. At the second refraction, the angle between red and violet rays further increases when compared to the angle between those at first refraction.
7. We observe bright rainbow when the angle between incoming and outgoing rays is near the maximum angle of 42°.

Question 6.
Image distances found due to a lens for different object distances are given in the table. Based on the information answer the questions given below :

Object distance (u) in cm	Image distance (v) in cm
40	24
30	30
20	60
10	30

i) What is the focal length of this lens?
Answer:
The focal length of the lens is 15 cm.

ii) What type of lens is it?
Answer:
It is a Convex lens.

iii) For what value of ‘u’ erected image is formed?
Answer:
For u = 10 cm, erected image is formed.

iii) For what value of ‘u’ diminished image is formed?
Answer:
For u = 40 cm, diminished image is formed.

Section – III (2 × 6 = 12)

Instructions:
i) 3 Essay type question are there in this section – III.
ii) Anwer any two the questions. Each question carries 6 marks.
iii) Write answer to each question in 8 to 10 sentences.

Question 7.
Write the names of any 3 types of chemical reactions of carbon compounds and give one example for each.
Answer:
1. Three types of chemical reactions of carbon compounds are:
i) Combustion
ii) Addition
iii) Substitution

2. Combustion reactions : The process of carbon or carbon compound in excess of oxygen to give heat and light is called the combustion reaction.
Eg :
i) C + O₂ → CO₂ + Energy
ii) 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O + Energy

3. Addition reactions: Unsaturated organic compounds undergo addition reactions to become saturated.

4. Substitution reactions: A reaction in which an atom or a group of atoms in a given compound is replaced by other atom or group of atoms is called a substitution reaction.

Question 8.
Explain Hund’s rule with electronic configuration of carbon and Aufbau principle with Moeller’ chart.
Answer:
Hund’s Rule : According to this rule electron pairing in orbitals starts only when all available empty orbitals of the same energy (degenerate orbitals) are singly occupied.
Ex :
1) The configuration of carbon atom (Z = 6) is 1s² 2s² 2p².
2) The first four electrons go into the Is and 2s orbitals.
3) The next two electrons go into separate 2p orbitals, with both electrons having the same spi

4) Note that the unpaired electrons in the 2p orbitals are shown with parallel spins.

Aufbau Principle : Orbitals are filled in the order of increasing energy. Two general rules help us to predict electronic configuration.
1) Electrons are assigned to orbitals in order of increasing value of (n + l).
2) For sub-shells with the same value of (n + /), electrons are assigned first to the sub-shell with lower ‘n’
Ascending order of energies of various atomic orbitals is given below :
1 s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7p < 8s …….

Question 9.
List the material required for the experiment which is done to understand that the resistance of 4 conductor is directly proportional to the length of the conductor and explain the procedure of the experiment.
Answer:
Aim : To prove that the resistance of a conductor is directly proportional to its length (1) for a constant potential difference.
Materials required :

1. Iron spokes of different lengths with the same cross-sectional areas.
2. Battery
3. Ammeter
4. Key
5. Wires

Procedure:

1. Make the circuit as shown in figure.
2. Connect one iron spoke and close the circuit.
   Note the ammeter reading in your notebook.
3. Continue the experiment with different iron spokes and note all readings in your notebook.

Observation : We observe that, as the length of the rod increases the current decreases.
Result (Conclusion): As the length of the rod increases, the resistance increases, i.e., R ∝ 1.

Part – B

Time: 15 Minutes
Marks: 10

Instructions :
1. Answer all the questions.
2. Each question carries 1 mark.
3. There are 4 options (A), (B), (C) and (D) for each question. Select the correct option and write it in the bracket given infront of the question.
4. Write the answers of Part-B in Part-B only and tie it to the answer sheet of Part-A.

Question 1.
Range of magnification values due to convex mirror:
l) -l < m ≤ 0
2) 0 ≤ m < l
3) -∞ ≤ m < – 0
4) 1 < m ≤ ∞
Answer:
2) 0 ≤ m < l

Question 2.
C₁, C₂ in the given figure denote:

1) Centre of curvatures
2) Focal points
3) Optic centres
4) The points at 2f distances from optic centre
Answer:
1) Centre of curvatures

Question 3.
Factors like nuclear charge, screening effect, atomic radius, penetration power of orbitais, stable configuration influence:
1) Ionization energy
2) Electron affmity
3) Electronegativity
A) (1) only
B) (1), (2) only
C) (1), (3) only
Answer:

Question 4.
Which of the following is not used in Ohm’s law experiment?
1) Magnet
2) Ammeter
3) Voltmeter
4) Cell
Answer:
4) Cell

Question 5.
A magnetic field is in t direction and an electron is moving in it in → direction. The direction of force on electron due to the magnetic field is ( )
1) ←
2) □ ↓
3) into the page
4) Out of the page
Answer:
4) Out of the page

Question 6.
Which of the following is not a process of purification of metal? (  )
1) Distillation
2) Liquation
3) Froth floatation
4) Poling
Answer:
3) Froth floatation

7. Choose the values of (A), (B), (C), (D) for the following chemical equation to make it balanced: (  )
(A) NH₃ + (B) Cl₂ → (C) N₂ + (D) NH₄Cl
1) 4, 1,1,2
2) 8, 3, 0,6
3) 4,2,1,2
4) 8,3,1,6
Answer:
4) 8,3,1,6

8. Which of the following can be used as olfactory indicator in testing of acids and bases? (  )
1) Methyl orange
2) Onion
3) Phenolphthalein
4) Turmeric
Answer:
2) Onion

9. The value of object distance to be taken while calculating the value of maximum focal length of human eye lens: 1 (  )
1) 0
2) 2.5 cm
3) ∞
4) 25 cm
Answer:
3) ∞

10. Colour of dry blue litmus paper after exposing it to HCl gas: (  )
l) Blue
2) Red
3) Pink
4) Ordnge
Answer:
l) Blue