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Arrange the following metals in the increasing order of their reactivities:
Copper, Zinc, Aluminium, and Iron
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Write the chemical equation for the following reaction:
Calcium metal reacts with water.
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Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
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Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
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Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
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Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
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Which one among the following is an acidic oxide?
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An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following.
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Having two eyes facilitates in
A: Increasing the field of view
B: Bringing three-dimensional view
C: Developing the concept of distance/size
Then the correct option is/are
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Near and far points of a young person normal eye respectively are:
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The ability of the eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called:
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The focal length of the eye lens increases when eye muscles ____________.
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The least distance of distinct vision for a normal eye is ____________.
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A student sitting on the last bench can read the letters written on the blackboard but is not able to read/the letters written in his textbook. Which of the following statements is correct?
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Conventionally, the direction of the current is taken as:
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Coulomb is the SI unit of ____________.
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When an electric current is passed, electrons move from:
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A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.
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If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are ____________.
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What is that instrument which can detect the presence of electric current in a circuit?
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