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Give a scientific reason.
Tungsten metal is used to make a solenoid type coil in an electric bulb.
Concept: Effects of Electric Current > Heating Effect of Electric Current
If in a medium, the speed of light is 1.5 × 108 m/s how much will the absolute refractive index of that medium be?
Concept: Refractive Index
Solve the problem.
If the mass of a planet is eight times the mass of the Earth and its radius is twice the radius of the Earth, what will be the escape velocity for that planet?
Concept: Free Fall
State Newlands‘ Law of Octaves.
Concept: Newland's Law of Octaves
Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ______.
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Concept: Periodic Properties > Atomic Radius Or Atomic Size
Write scientific reason.
Elements belonging to the same group have the same valency.
Concept: Periodic Properties > Valency
An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the atomic number of this element?
Concept: Modern Periodic Table and Electronic Configuration of Elements
An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the group of this element?
Concept: Modern Periodic Table and Electronic Configuration of Elements
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
Concept: Modern Periodic Table and Electronic Configuration of Elements
Define ‘redox reaction’. Give one example.
Concept: Oxidation, Reduction and Redox Reactions
Define corrosion.
Concept: Oxidation, Reduction and Redox Reactions
- Complete the given chemical reaction:
\[\ce{CuSO4_{(aq)} + Fe_{(s)} ->}\] _______ + _______ - Name the type of the reaction.
Concept: Types of Chemical Change or Chemical Reaction > Single Displacement Reactions
Observe the following figure and write the answer of the question.
- Which process is shown in the figure?
- Explain the chemical reaction shown in the figure.
- Write the reactions on anode and cathode.
Concept: Corrosion of Metals
The device used for producing electric current is called _________.
Concept: Electromagnetic Induction
Give a scientific reason.
For electric power transmission, copper or aluminium wire is used.
Concept: Effects of Electric Current > Heating Effect of Electric Current
Name the following diagram and explain the concept behind it.
Concept: Electromagnetic Induction
Observe the following diagram and answer the questions given below:
- Identify the above diagram. (1)
- Write the principle on which the above appliance works. (1)
- Write the working of the above appliance. (2)
- Write the use of the above appliance. (1)
Concept: Electric Generator
Read the following paragraph and answer the questions based on it.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box, then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
Concept: Heat Exchange
