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How much does ClearSteps cost for CBSE preparation?

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CBQ Practice›Class 10 Science

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Class 10 Science
CBQ Practice

Competency Based Questions · 3 chapters · 6 CBQ sets

Question types:Case StudySource BasedAssertion–Reason

💡Attempt each question before clicking Show Answers — then compare.

Filter:

Ch 1

Chemical Reactions and Equations

2 sets

CBQ 1Case StudyRusting of Iron and Rancidity of Food4 marks

Read the passage

Priya noticed that her bicycle left outside in the rain developed a reddish-brown coating on its iron parts over a few days. Her science teacher explained that this is a chemical change called corrosion. Iron reacts with oxygen and moisture in the atmosphere to form hydrated iron oxide (Fe₂O₃·xH₂O), which is commonly called rust. Meanwhile, Priya's mother kept some fried chips in an open container and noticed they tasted stale after two days. The teacher explained this is called rancidity — another chemical change where fats and oils in food get oxidised by atmospheric oxygen, producing unpleasant odour and taste. Both rusting and rancidity are examples of oxidation reactions that cause harm in everyday life.

The chemical process responsible for the rusting of iron is:

(A)Reduction of iron by moisture

(B)Oxidation of iron by atmospheric oxygen and moisture

(C)Decomposition of iron in sunlight

(D)Displacement of iron by copper

Rancidity of food is caused by the oxidation of:

(A)Proteins

(B)Carbohydrates

(C)Fats and oils

(D)Vitamins

Which of the following methods can be used to prevent rancidity?

(A)Storing food in open containers

(B)Adding antioxidants and storing in airtight containers

(C)Heating food repeatedly

(D)Storing food near a light source

Name two methods used to prevent rusting of iron and explain any one.

CBQ 2Assertion–Reason1 mark

Assertion

The reaction 2Mg + O₂ → 2MgO is called a combination reaction as well as an oxidation reaction.

Reason

A combination reaction is one in which two or more substances combine to form a single product, and oxidation is the gain of oxygen by a substance.

(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

(D) A is false but R is true

Ch 6

Life Processes

2 sets

CBQ 1Case StudyPhotosynthesis and Stomata4 marks

Read the passage

During a biology lab session, students placed a green leaf in sunlight with one portion covered by black paper. After a few hours, they removed the covering and tested the leaf with iodine solution. The uncovered portion turned blue-black, while the covered portion remained brown. Their teacher explained that the green portions performed photosynthesis using sunlight and converted carbon dioxide and water into glucose and oxygen. The glucose was stored as starch. The teacher further explained that carbon dioxide enters the leaf through tiny pores called stomata, which are present mostly on the lower surface of leaves. Stomata also facilitate transpiration — the loss of water vapour. Each stoma is surrounded by two guard cells that control its opening and closing.

The iodine test is used to detect the presence of:

(A)Glucose

(B)Starch

(C)Proteins

(D)Fats

Why did the covered portion of the leaf not turn blue-black with iodine?

(A)It had more chlorophyll

(B)No photosynthesis occurred as sunlight was blocked

(C)It had more stomata

(D)Carbon dioxide was not available

The opening and closing of stomata is controlled by:

(A)Epidermal cells

(B)Palisade mesophyll cells

(C)Guard cells

(D)Vascular bundle cells

Write the overall chemical equation for photosynthesis and state the role of chlorophyll.

CBQ 2Assertion–Reason1 mark

Assertion

In aerobic respiration, glucose is completely oxidised to CO₂ and water, releasing more energy than in anaerobic respiration.

Reason

Aerobic respiration occurs in the presence of oxygen and involves complete breakdown of glucose through glycolysis, Krebs cycle, and oxidative phosphorylation.

(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

(D) A is false but R is true

Ch 12

Electricity

2 sets

CBQ 1Case StudyHousehold Circuit and Electrical Safety4 marks

Read the passage

Arun's family recently got their house rewired. The electrician explained that household circuits use a parallel arrangement for appliances so that each appliance gets the same voltage (220 V in India) and can be operated independently. He installed a 15 A fuse in the main line for safety. Arun observed that when he switched on a geyser (2 kW) along with a room heater (1 kW) and a television (0.1 kW) simultaneously, the fuse blew. The electrician replaced it and explained the concept of overloading. He also told Arun that a fuse wire has high resistance and low melting point — it melts and breaks the circuit when current exceeds the safe limit, protecting expensive appliances from damage.

Why are household appliances connected in parallel rather than in series?

(A)To increase the total resistance of the circuit

(B)So that each appliance gets the same voltage and can be operated independently

(C)To reduce the total current in the circuit

(D)To save electricity

What is the total current drawn when the geyser (2 kW), heater (1 kW), and TV (0.1 kW) are all on at 220 V?

(A)12.5 A

(B)14.1 A

(D)16.2 A

A fuse wire has:

(A)Low resistance and high melting point

(B)High resistance and high melting point

(C)High resistance and low melting point

(D)Low resistance and low melting point

Calculate the resistance of the geyser (2 kW, 220 V) using the formula P = V²/R.

CBQ 2Assertion–Reason1 mark

Assertion

When resistors are connected in series, the current through each resistor is the same.

Reason

In a series circuit, there is only one path for the flow of current, so the same current flows through all components.

(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

(D) A is false but R is true

Also useful for Class 10 Science

NCERT Solutions →Important Questions →Chapter Summaries →All CBQ Subjects →Topper Answer Sheets →

Class 10 ScienceCBQ Practice

Chemical Reactions and Equations

Life Processes

Electricity

Also useful for Class 10 Science

Class 10 Science
CBQ Practice