Quiz Class 10th Science 06-05-2026

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Q1. Melting of candle wax on heating

explanation:

1. Changes in substances are of two types: physical and chemical.
2. In a physical change, no new substance is formed (only shape or state changes).
3. When candle wax is heated, it changes from solid to liquid.
4. The substance is still wax — nothing new is formed.
5. This change can also be reversed by cooling (liquid → solid).

Conclusion:
Melting of wax is a physical change, so it does NOT involve a chemical reaction.

Q2. Virtual and erect

explanation:

1. A plane mirror reflects light to form an image.
2. The image appears behind the mirror, but light does not actually come from there.
3. Such an image is called virtual (cannot be caught on a screen).
4. The image is also upright (erect), not upside down.
5. Additionally, it is the same size as the object and shows left-right reversal (lateral inversion).

Conclusion:
A plane mirror always forms a virtual and erect image.

Q3. Al₂O₃ (Aluminium oxide)

explanation:

1. Oxides are classified as acidic, basic, or amphoteric.
2. Amphoteric oxides can react with both acids and bases.
3. Aluminium oxide (Al₂O₃) shows this special property.
4. Example:
   • With acid → behaves like a base
   • With base → behaves like an acid

Conclusion:
Al₂O₃ is an amphoteric oxide because it reacts with both acids and bases.

Q4. All of the above

explanation:

1. Autotrophic nutrition means organisms make their own food.
2. Plants prepare food by the process of photosynthesis.
3. For this process, they need:
   • Carbon dioxide (from air)
   • Water (from soil)
   • Chlorophyll (green pigment in leaves)
   • Sunlight (energy source)
4. All these factors work together to produce food (glucose).

Conclusion:
All given options are required, so the correct answer is All of the above.

Q5. Nervous and endocrine systems

explanation:

1. The body needs control systems to manage activities like movement, growth, and digestion.
2. The nervous system works through nerves and gives quick responses (like touching a hot object).
3. The Endocrine system works through hormones and gives slow but long-lasting effects (like growth, puberty).
4. Both systems coordinate and regulate all life processes together.

Conclusion:
Human life processes are controlled by both nervous and endocrine systems.