Haryana Board HBSE Class 10th Science Question Paper 2025 With Answer Key: FREE PDF Download

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HBSE Class 10th Science Exam 2025: Highlights

In this table, we are providing the key highlights of Haryana Board Class 10th Science exam. 

Haryana Board HBSE Class 10th Science Question Paper 2025 

Below is the provided set for HBSE Class 10th Science Question Paper 2025. 

HBSE Class 10th Science Answer Key 2025

Below are the answers for Haryana Board Class 10th Science Question Paper. 

1. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be: 

(A) 100 W 

(B) 75 W 

(C) 50 W 

(D) 25 W

2. शक्ति का छोटा मात्रक है.....................

..................... is the small unit of electric power.

उत्तर: शक्ति (Power) का छोटा मात्रक वाट (Watt, W) होता है।

English: The small unit of electric power is Watt (W).

3. बल्बों में कौन-सी गैस भरी जाती है ?

Which gas is filled in electric bulbs?

उत्तर: इलेक्ट्रिक बल्बों में आमतौर पर आर्गन (Argon) और नाइट्रोजन (Nitrogen) गैस भरी जाती है।

Electric bulbs are usually filled with Argon and Nitrogen gas.

4. The question below consists of two statements: Assertion (A) and Reason (R), answer the question by selecting the appropriate option given below:

Assertion (A): The eyelens has the ability to focus clearly on the retina by

Reason (R): adjusting its focal length.

This phenomenon is known as the power of accommodation.

(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.

5. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be:

(A) only plane

(B) only concave

(C) only convex

(D) either plane or convex

6. किसी अंतरिक्ष यात्री को आकाश नीले की अपेक्षा काला क्यों प्रतीत होता है ?

Why does the sky appear dark instead of blue to an astronaut? 

Answer:

In space, there is no atmosphere to scatter sunlight. On Earth, the sky appears blue because air molecules scatter shorter-wavelength blue light more than other colors (Rayleigh scattering). However, in space, due to the absence of air, no scattering occurs, making the sky appear black to astronauts.

7. द्विखंडन, बहुखंडन से किस प्रकार भिन्न है ?

How is binary fission different from multiple fission?

Answer:

8. (a) किसी छड़ चुंबक के चारों ओर चुंबकीय क्षेत्र रेखाएँ खींचिए। 

Draw magnetic field lines around a bar magnet.

Answer: 

(b) बकीय क्षेत्र रेखाओं के कोई हो गुण लिखिए।

Write any two properties of magnetic field lines.

Properties of Magnetic Field Lines:

1. Magnetic field lines never intersect – If they did, it would mean that a magnetic field has two different directions at the same point, which is impossible.
   
2. They emerge from the North Pole and enter the South Pole outside the magnet, forming closed loops. Inside the magnet, they move from the South Pole to the North Pole.

9. Define Ohm's law. State SI unit of resistance. Select the correct equation of resistance in accordance with Ohm's law from the below options:
(A) R = V/I
(B) R = 1/V

Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points, provided the temperature and other physical conditions remain constant. Mathematically,
V=IR
where V is the voltage (in volts), I is the current (in amperes), and R is the resistance (in ohms, Ω).

SI Unit of Resistance:

The SI unit of resistance is Ohm (Ω).

Correct Equation of Resistance:

From Ohm’s Law, 

R= V/I

So, the correct option is:
(A) R = V/I

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