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Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

In jar B, because oxygen is a supporter of combustion. Explanation In glass jar B the candle remains lighted for... View Article

Explain giving reasons (a) Balanced diet is necessary for maintaining healthy body. (b) Health of an organism depends upon the surrounding environmental conditions. (c) Our surrounding area should be free of stagnant water. (d) Social harmony and good economic conditions are necessary for good health.

(a) Balanced diet is necessary for maintaining a healthy body. A balanced diet can not only help you physically but... View Article

Meena and Hari observed an animal in their garden. Hari called it an insect while Meena said it was an earthworm. Choose the character from the following which confirms that it is an insect. (a) Bilateral symmetrical body (b) Body with jointed legs (c) Cylindrical body (d) Body with little segmentation

b) Body with jointed legs Explanation The term “arthropod” means “jointed legs”. The phylum included invertebrates with an exoskeleton and... View Article

Migratory birds fly to faraway areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour? (i)Unavailability of food. (ii) Extreme weather conditions. (iii) Overcrowding. (iv) Lack of nesting areas. (a) ii & iii; (b) i & ii; (c) i & iv; (d) ii & iv.

d) i and ii The dwelling of a species in a particular area depends on the physical, biological and climatic... View Article

Choose the incorrect statement from the following: (a) It is difficult to transport natural gas through pipes. (b) The disadvantage of natural gas is that it can not be used directly for burning in homes. (c) Natural gas is stored under high pressure as compressed natural gas. (d) Natural gas cannot be used for power generation.

A) It is difficult to transport natural gas through pipes Natural gas is a naturally occurring hydrocarbon gas mixture of... View Article

The name of the product formed in the reaction of sulphur and ___ is sulphur dioxide gas. When sulphur dioxide is dissolved in_, sulphurous acid is formed. The sulphurous acid turns _ litmus paper to . Generally oxides of ____ are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.

The name of the product formed in the reaction of sulphur and Oxygen is sulphur dioxide gas. When sulphur dioxide... View Article

Choose the correct sequences (a) CO2 in atmosphere → decomposers → organic carbon in animals → organic carbon in plants (b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil (c) Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers (d) Organic carbon in animals → decomposers → CO2 in atmosphere → organic carbon in plants

(b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil Explanation... View Article

Which of the following statements about transmission of nerve impulse is incorrect? (a) Nerve impulse travels from dendritic end towards axonal end (b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron (c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron (d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells

b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at... View Article

The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition? (a) The addition of undesirable substances to water-bodies (b) The removal of desirable substances from water-bodies (c) A change in pressure of the water bodies (d) A change in temperature of the water bodies

c) A change in pressure of the water bodies. Explanation Water pollution can be defined as the contamination of water... View Article

OSI Model Full Form

What Is The Full Form Of OSI Model? The Full Form Of OSI Model is a Open Systems Interconnection The... View Article

Difference Between Constructor and Destructor in C++

Constructors and destructors are very important members of the programming family. Even in C++, both constructor and destructor are known... View Article

Difference Between Compile-time and Run-time Polymorphism in Java

Compile-time Vs. Run-time Polymorphism: What is the difference between Compile-time Vs. Run-time Polymorphism in Java? Polymorphism is one of the... View Article

Which of the following are exotic breeds? (i) Brawn (ii) Jersey (iii) Brown Swiss (iv) Jersey Swiss (a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv

b) (ii) and (iii) Explanation Jersey breed is known for its high milk fat percentage and brown Swiss has the... View Article

A few of Paheli’s classmates eat potato chips and burgers regularly during the recess at school. Are they healthy eating habits? Give reasons.

This is not acceptable and causes several diseases also. Fast food like pizzas, chaat, vada pav, bhajiyas, samosas, burgers, frankies,... View Article

Naphthalene balls are obtained from coal tar and are used as: (a) mosquito repellant (b) honey bee repellant (c) moth repellant (d) snake repellant

c) Moth repellant Naphthalene is flammable and potentially explosive. Hence, Naphthalene balls are obtained from coal tar. The labelled use... View Article

Cells consist of many organelles, yet we do not call any of these organelles as a structural and functional unit of living organisms. Explain.

Although cell organelles have specific structures and perform specific functions but they cannot be called structural and functional units of... View Article

Water is the best extinguisher for fires involving electrical equipment. (True or False). Also write the false statements in their correct form.

False – Carbon dioxide is the best extinguisher for fires involving electrical equipment. If electrical equipment is on fire, water... View Article

Metals are generally solid. Which of the following metals is in the liquid state at room temperature? (a) Mercury (b) Silver (c) Aluminium (d) Sodium

Mercury Generally, all the metals are found in the solid state at room temperature. The exception to this is mercury.... View Article

A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such situation? Explain.

Concentration salt solution is a hypertonic solution (water concentration lower as compared to the cell) therefore it causes exosmosis. The... View Article

The cell organelle involved in forming complex sugars from simple sugars are (a) endoplasmic reticulum (b) ribosomes (c) plastids (d) golgi apparatus

d) Golgi apparatus The Golgi apparatus has multiple names such as Golgi complex or Golgi body. The name is given... View Article

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