Class 7 practice
Class 7 science questions.
Science questions for Class 7, at the level of students aged 12–14, each with its answer and a short explanation. Try each one before opening the answer.
What is the primary method of heat transfer through a solid metal spoon placed in hot tea?
Level 1 of 5Show the answer
Answer: Conduction
Conduction is the transfer of heat through direct contact between vibrating particles in solids, such as metals.
What is the boiling point of pure water at normal sea-level atmospheric pressure?
Level 1 of 5Show the answer
Answer: 100 °C
Pure water boils and turns into steam at 100 degrees Celsius under standard atmospheric pressure.
Ananya tests fresh lemon juice using blue litmus paper. What color change will she observe?
Level 1 of 5Show the answer
Answer: Turns red
Lemon juice contains citric acid. Acids turn moist blue litmus paper red.
- True or false?
Sound requires a material medium like solid, liquid, or gas to travel.
Level 1 of 5Show the answer
Answer: True
Sound waves propagate through particle vibrations in a medium. Because empty space contains no particles, sound cannot travel through a vacuum.
- True or false?
Light travels faster through water than it travels through empty space.
Level 1 of 5Show the answer
Answer: False
Light travels fastest in a vacuum or empty space. It slows down when entering denser mediums like water and glass.
- Fill in the blank.
An image formed by a plane mirror that cannot be captured on a screen is called a ___ image (clue: starts with 'v').
Level 1 of 5Show the answer
Answer: virtual
A virtual image is formed when reflected rays appear to meet behind a mirror and cannot be projected on a screen.
Which of the following materials is the odd one out based on how it transmits light?
Level 1 of 5Show the answer
Answer: Frosted glass
Frosted glass is translucent and scatters light. Clear glass, pure water, and clean air are transparent materials.
Ananya heats one end of an iron rod in a flame. Soon, the other end becomes hot too. Which mode of heat transfer is mainly responsible for this?
Level 2 of 5Show the answer
Answer: Conduction
Conduction is the transfer of heat through solids from atom to atom without the bulk movement of the matter itself.
Rohan looks into a flat plane mirror while combing his hair. He raises his left hand. Which hand does his mirror image appear to raise?
Level 2 of 5Show the answer
Answer: Right hand
Plane mirrors produce lateral inversion. In lateral inversion, the right side of the object appears on the left side of the image, and vice versa.
Vikram takes an ice-cold steel tumbler filled with water on a humid day in Chennai. After a few minutes, he spots tiny water droplets on the outer surface. Which process caused this to happen?
Level 2 of 5Show the answer
Answer: Condensation
Water vapor present in the warm air cools down when it touches the cold tumbler surface. It condenses into liquid water droplets.
Green plants prepare food through photosynthesis. Which tiny pores on the leaf surface allow carbon dioxide to enter for this process?
Level 2 of 5Show the answer
Answer: Stomata
Stomata are microscopic pores mainly located on the underside of leaves. They allow the intake of carbon dioxide and release of oxygen.
During inhalation in humans, which dome-shaped muscular sheet moves downwards to help expand the chest cavity?
Level 2 of 5Show the answer
Answer: Diaphragm
The diaphragm contracts and flattens downwards during inhalation. This increases chest cavity volume, drawing air into the lungs.
Aarav places a metal spoon in a hot bowl of dal. After a few minutes, the handle becomes warm. Which heat transfer process explains this?
Level 2 of 5Show the answer
Answer: Conduction
Conduction is the transfer of heat through direct contact between neighboring particles in a solid, without the movement of the material itself.
In many Indian regions, gardeners prize dark topsoil because it supports healthy plant growth. Which component gives rich topsoil its dark colour and high fertility?
Level 2 of 5Show the answer
Answer: Humus
Humus consists of decaying organic matter from dead plants and animals. It enriches the soil with vital nutrients and helps it retain moisture.
What is the standard International System (SI) unit of pressure?
Level 2 of 5Show the answer
Answer: Pascal
Pressure is defined as force per unit area. Its SI unit is the pascal (Pa), which is equal to one newton per square metre.
Sunita shines a narrow beam of sunlight through a glass prism in a dark room. The beam spreads out into a band of seven distinct colors on the opposite wall. What is this phenomenon called?
Level 2 of 5Show the answer
Answer: Dispersion
Dispersion is the splitting of white light into its component colors when it passes through a transparent medium like a prism.
- True or false?
A plant cell possesses a rigid outer cell wall made of cellulose surrounding its cell membrane.
Level 2 of 5Show the answer
Answer: True
The cell wall surrounds the cell membrane in plant cells. It provides structural support, protection, and shape, whereas animal cells lack this wall.
- Fill in the blank.
Often called the powerhouse of the cell, the organelle that produces cellular energy is the ___ (first letter: m).
Level 2 of 5Show the answer
Answer: mitochondria
Mitochondria generate most of the chemical energy needed by cells through cellular respiration, earning them the nickname 'powerhouse'.
- Fill in the blank.
The chemical reaction between an acid and a base to form salt and water is called ___ (starts with n).
Level 2 of 5Show the answer
Answer: neutralisation
In a neutralisation reaction, acidic and basic properties cancel each other out, forming a neutral solution containing salt and water.
Which of the following is the odd one out based on the mode of nutrition?
Level 2 of 5Show the answer
Answer: Amoeba
Amoeba exhibits holozoic nutrition by engulfing food particles. Yeast, mushroom, and bread mould are fungi that show saprotrophic nutrition by absorbing nutrients from dead organic matter.
These questions come from Ado’s question bank and are written with AI help. They are never used in ranked play, so practising them here can’t change anyone’s rank.
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