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Class 10th Science MCQs based on NCERT concepts. Revise baking soda, power of accommodation, digestion, plant hormones, and electric generators with exam-focused descriptions.
Do You Know
Chapter Information
- Class: 10
- Subject: Science
- Quiz Type: Multiple Choice Questions
- Total Questions: 5
Introduction
This Class 10 Science quiz covers important concepts from Acids, Bases and Salts, Life Processes, Control and Coordination, and Electricity. These questions are useful for quick revision and exam preparation.
What You Will Learn
- Common name and use of sodium hydrogen carbonate
- Power of accommodation of the human eye
- Site of complete digestion
- Role of abscisic acid
- Function of a generator
Why This Topic Is Important
These concepts are frequently used in school-level Science examinations. Understanding the basic idea behind each answer helps students recall the concepts more effectively.
Q1. Which of the following is a plant hormone that helps in the wilting of leaves?
A) Auxin
B) Gibberellin
C) Cytokinin
D) Abscisic acid
Answer: Abscisic acid
Description for Exam:
Abscisic acid (ABA) is a plant hormone associated with growth inhibition and responses to water stress. It promotes processes such as stomatal closure and is associated with wilting and dormancy-related responses.
- Description: Abscisic acid (ABA) is a plant growth inhibitor. It is often called the “stress hormone” because it helps plants survive adverse conditions. It is responsible for the closing of stomata and the wilting (falling off) of leaves and fruits.
- Other Options: Auxins and Gibberellins promote cell elongation and growth, while Cytokinins promote cell division.
Q2. The ability of an eye to focus on distant as well as nearby objects is called:
A) Power of accommodation
B) Myopia
C) Hypermetropia
D) Presbyopia
Answer: Power of accommodation
Description for Exam:
The power of accommodation is the ability of the human eye lens to change its focal length so that objects at different distances can be seen clearly. The ciliary muscles help change the shape of the eye lens for focusing.
- Description: This is the ability of the eye lens to adjust its focal length. To see nearby objects clearly, the ciliary muscles contract to make the lens thicker; for distant objects, the muscles relax to make the lens thinner.
- Other Options: Myopia and Hypermetropia are vision defects where a person cannot see distant or nearby objects clearly, respectively.
Q3. What is the common name of Sodium Hydrogen Carbonate?
A) Bleaching powder
B) Washing soda
C) Baking soda
D) Plaster of Paris
Answer: Baking soda
Description for Exam:
Sodium hydrogen carbonate is commonly known as baking soda. Its chemical formula is:
It is used in baking and is also an important compound discussed in the chapter Acids, Bases and Salts.
- Description: Its chemical formula is $$NaHCO_3$$. It is commonly used in baking to make cakes and bread fluffy by releasing carbon dioxide gas when heated. It also acts as an antacid to neutralize stomach acidity.
- Other Options: Washing soda is $$Na_2CO_3 \cdot 10H_2O$$, and Bleaching powder is $$CaOCl_2$$.
Q4. In which part of the alimentary canal is food finally digested?
A) Small intestine
B) Stomach
C) Large intestine
D) Mouth cavity
Answer: Small intestine
Description for Exam:
Most of the digestion of food is completed in the small intestine. Digestive juices from the intestinal wall, pancreas, and bile from the liver help break food into simpler substances that can be absorbed by the body.
- Description: Although digestion starts in the mouth and continues in the stomach, the Small Intestine is the site for the complete digestion of carbohydrates, proteins, and fats. It receives secretions from the liver (bile) and pancreas to finish the process.
- Other Options: The Stomach mainly digests proteins, and the Large Intestine primarily absorbs water and salts from undigested food.
Q5. The device used for producing electric current is called a:
A) Ammeter
B) Motor
C) Galvanometer
D) Generator
Answer: Generator
Description for Exam:
A generator converts mechanical energy into electrical energy and produces electric current through electromagnetic induction. An ammeter measures current, while a motor converts electrical energy into mechanical energy.
- Description: An electric generator is a device that converts mechanical energy into electrical energy. It works on the principle of electromagnetic induction.
- Other Options: An Ammeter is used to measure the current in a circuit, while a Motor does the opposite of a generator (converts electrical energy into mechanical energy).
Important Concepts
1. Baking Soda
Sodium hydrogen carbonate is:
Common name: Baking soda
2. Power of Accommodation
The eye changes the focal length of its lens to focus clearly on objects at different distances.
3. Digestion
The small intestine is the main site where digestion is completed and nutrients are absorbed.
4. Plant Hormone
Abscisic acid (ABA) is associated with growth inhibition and plant responses to water shortage.
5. Generator
A generator produces electrical energy from mechanical energy using electromagnetic induction.
Exam Tips
- Remember: NaHCO₃ → Baking soda.
- Do not confuse accommodation with eye defects such as myopia and hypermetropia.
- The small intestine is the major site of completion of digestion and nutrient absorption.
- ABA is commonly associated with growth inhibition and stress responses.
- Generator → mechanical energy to electrical energy.
Quick Revision Notes
| Concept | Answer |
| Sodium hydrogen carbonate | Baking soda |
| Eye focusing ability | Power of accommodation |
| Main site of completed digestion | Small intestine |
| Plant hormone associated with growth inhibition | Abscisic acid |
| Device producing electric current | Generator |
Common Mistakes Students Make
- Confusing baking soda with washing soda.
- Confusing power of accommodation with an eye defect.
- Choosing the stomach instead of the small intestine for completion of digestion.
- Confusing ABA with growth-promoting hormones.
- Confusing a generator with a motor.
FAQs
Q1. What is the formula of baking soda?
The formula of baking soda is .
Q2. What is power of accommodation?
It is the ability of the eye to focus clearly on objects at different distances.
Q3. Where is digestion mainly completed?
Digestion is completed mainly in the small intestine.
Q4. What is the function of abscisic acid?
It helps regulate growth and plant responses to environmental stress, including water shortage.
Q5. What does a generator do?
A generator converts mechanical energy into electrical energy.
Key Takeaways
- Baking soda →
- Eye focusing → Power of accommodation
- Digestion → Small intestine
- Plant stress hormone → Abscisic acid
- Electricity-producing device → Generator
Conclusion
These five questions revise important Class 10 Science concepts from different NCERT topics. Regular practice of such MCQs can help students strengthen their conceptual understanding and prepare effectively for examinations.
NCERT Reference
This quiz is originally written and paraphrased for educational practice using concepts from the relevant NCERT Class 10 Science chapters. The questions and explanations above are not copied as passages from the textbook.
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