List of practice Questions

अधिकारी द्वारा मामले की जाँच-पड़ताल की गई। (वाच्य को पहचानकर उसका भेद लिखिए) 
 

For a reaction : \( N_2 + 3H_2 \rightarrow 2NH_3 \), the rate of reaction with respect to \( NH_3 \) is
In a certain code, 'PAPER' is written as 'SBTGU'. How will 'COUNCIL' be written in that code?
Find the odd man out:
Cooking of food, Ripening of fruit, Milk turned into curd, Transformation of ice into water.

Observe the figure and answer the following questions:
(a) Which gas is released as effervescence in the big test tube? 
(b) What is the colour change in the lime water? 
(c) Write the related chemical equation.

Draw a neat labelled diagram of electric motor and write its principle. 

Write the main steps in the extraction of aluminium.
What is the melting point of alumina and how is the melting point reduced?
Write the main steps in the extraction of aluminium.
What is the melting point of alumina and how is the melting point reduced?
Why do anodes need to be replaced from time to time during the electrolysis of alumina?
Write the names from the description:
What is meant by ‘mirage’? In which condition mirage is seen?
Draw a diagram of 'image formed by concave lens'.
State the nature of image formed by concave lens.
If the focal length of a concave lens is 25 cm, find the power of the lens.
Heat is transferred from where to where?
Which principle do we learn from this process?
How will you state the principle briefly?
State whether the above chemical reaction is balanced or not. From the number of atoms present in the reactants and products, fill in the blanks:
The geostationary satellites are not useful for studies of polar regions.
The hydrogenation of vegetable oil in the presence of nickel catalyst forms Vanaspati-ghee.
Atomic radius goes on increasing down the 'group'.
What is meant by an 'alloy'? Give two examples.
Distinguish between oxidation and reduction.