आपकी सीबीएसई बोर्ड परीक्षा बहुत पास आ गई हैं। और आपने उसके लिए तैयारी भी शुरू कर दी होगी। आप सीबीएसई कक्षा 10 समय सारणी यहां से देख सकते हैं। सीबीएसई के बोर्ड के परीक्षाओं को लेकर सभी छात्र बहुत परेशान हो जाते हैं। वो सोचते हैं कि वो कैसे अच्छे नंबर लाएं। आज के हमारे इस आर्टिकल में आपको विज्ञान के पेपर में आने वाले कुछ महत्तवपूर्ण सवाल बताएं जाएंगे। इस साल सीबीएसई कक्षा 10 परीक्षा पैटर्न भी बदल गया है। आप सीबीएसई कक्षा 10 विज्ञान परीक्षा पैटर्न यहां से देख सकते हैं। परीक्षा के समय छात्र अधिकतर देखते हैं कि कौन से ऐसे सवाल हैं जो जरूर आते हैं। या उस सवाल जैसे सवाल आते हैं। तो हम आज के इस आर्टिकल में आपके लिए लाएं हैं कि विज्ञान के पेपर के लिए कौन से सवाल महत्तवपूर्ण हैं। तो आइए बताते हैं कि कौन से महत्तवपूर्ण सवाल हैं जो पूछे जाते हैं या जिस तरह के सवाल पूछे जाते हैं।

सीबीएसई कक्षा 10 विज्ञान के महत्तवपूर्ण क्वेश्चन

Q. The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.

Q. What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process?

Q. Give reasons for the following:

(a)  Arteries are thick walled.

(b) Blood goes only once in one cycle through the heart in fishes.

(c) Plants have low energy needs.

Q. The resistance of a wire of 0.01 cm radius is 10Ω. If the resistivity of the material of the wire is 50 × 10−8 ohm meter, find the length of the wire.

Q. (a) List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.

(b) Write the function of the retina in the human eye.

(c) Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?

Q. Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source.
(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.

(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.

Q. a) An organic compound A with molecular formula C2H4O2 on reaction with Sodium metal Na releases a gas B which readily catches fire. An on reacting with Ethanol in the presence of concentrated Sulphuric acid gives a sweet-smelling substance C used in making perfumes.

Write a balanced chemical equation to represent these two reactions and identify   the compounds A, B and C.

(b) Differentiate between metals and non metals?

Q. An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre ‘O’ of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark the optical centre ‘O’, principal focus F and height of the image on the diagram.

Q. Name the reducing agent in the following reaction: 3 MnO2 + 4AI —-> 3Mn + 2Al2O3 Which is more reactive – Mn or Al and why?

Q. What is the acid present in the following food? 1) Tomato 2) Vinegar 3) Tamarind

अति लघु उत्तरीय प्रश्न (1 और 2 नंबर के लिए)

Q.  Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path.

Q. What is the important function of the presence of ozone in earth’s atmosphere?

Q.  Dark reaction of photosynthesis does not need light. Do plants undergo dark reaction at night? Explain.

ऐसे और भी सवाल देख सकते हैं।

लघु उत्तरीय प्रश्न (तीन नंबर के लिए)

Q. How are we able to see distant and nearby objects clearly? Which part of eye helps in changing the curvature of lens? Why no image is formed at blind spot?

Q. (a) Which property of carbon leads to the formation of large number of compounds? Define it.
(b) What is the functional group in the following molecules?
(ii) CH3COOH

Q. (a) Why magnification is taken negative for real images and positive for virtual images?

(b) Why convex mirror is used in rear view mirrors and not concave mirror?

ऐसे और भी सवाल देख सकते हैं।

दीर्घ उत्तरीय प्रश्न (5 नंबर के लिए)

Q. (a) What are ‘magnetic field lines’? How is the direction of a magnetic field at a point determined?

(b) Draw two field lines around a bar magnet along its length on its two sides and mark the field directions on them by arrow marks.

Q. (a) Mention the pH range within which our body works. Explain how antacids
give relief from acidity. Write the name of one such antacid.
(b) Fresh milk has a pH of 6. How does the pH will change as it turns to curd? Explain your answer.
(c) A milkman adds a very small amount of baking soda to fresh milk. Why does this milk take a longer time to set as curd?
(d) Mention the nature of toothpaste. How do they prevent tooth decay?

ऐसे और भी सवाल देख सकते हैं।

Q. Atoms of eight elements A. B. C. D, E, F. G and H have the same number of electronic shells but a different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following questions:

(i) To which group or period of the periodic table do the listed elements belong?

(ii) What would be the nature of compound formed by a combination of elements B and F?

(iii) Which two of these elements could definitely be metals?

(iv) Which one of the eight elements is most likely to be found in gaseous state at room temperature?

(v) If the number of electrons in the outermost shell of elements C and G is 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.

ऐसे और भी सवाल देख सकते हैं।

महत्वपूर्ण प्रैक्टिकल आधारभूत प्रश्न

Q. Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.

Q. Write two precautions to be taken while identifying different parts of an embryo of a dicot seed.

Q. A student is to conduct an experiment to show CO2 is released during respiration. List two precautions that he/she must take for obtaining correct observation.

ऐसे और भी सवाल देख सकते हैं।

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