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\[\ce{Pb + CuCl2 -> PbCl2 + Cu}\]
The above reaction is an example of:
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Carbon exists in the atmosphere in the form of ______.
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The portion left on dropping a hydrogen atom from an alkane is called ______.
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A part of the body which responds to the instructions sent from the nervous system is called ____________.
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Reflex arc is formed by:
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The property of self-linkage among identical atoms to form long chain compounds is known as ______.
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Assertion: Reflex Arc works faster than the thinking process of the brain.
Reason: Reflex Arc works in the case of those animals who do not have a thinking process.
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Materials which allow larger currents to flow through them are called:
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The element used almost exclusively for filaments of incandescent lamps:
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The effective resistance between A and B is:
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A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has an area of cross-section:
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Assertion: Conductors allow the current to flow through themselves.
Reason: They have free charge carriers.
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An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on ____________.
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If two circular coils can be arranged in any of the three situations as shown in the diagrams below, then their mutual induction will be:
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The nature of magnetic field line passing through the centre of current carrying circular loop is ____________.
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Use the data in the Table given below to answer the following –
Which material is the best conductor?
Table give below Electrical resistivity of some substances at 20°C
| Electrical resistivity of some substances at 20°C | ||
| − | Material | Resistivity (Ω m) |
| Conductors |
Silver | 1.60 × 10−8 |
| Copper | 1.62 × 10−8 | |
| Aluminium | 2.63 × 10−8 | |
| Tungsten | 5.20 × 10−8 | |
| Nickel | 6.84 × 10−8 | |
| Iron | 10.0 × 10−8 | |
| Chromium | 12.9 × 10−8 | |
| Mercury | 94.0 × 10−8 | |
| Manganese | 1.84 × 10−6 | |
| Alloys |
Constantan (alloy of Cu and Ni) |
49 × 10−6 |
| Manganin (alloy of Cu, Mn and Ni) |
44 × 10−6 | |
| Nichrome (alloy of Ni, Cr, Mn and Fe) |
100 × 10−6 | |
| Insulators | Glass | 1010 − 1014 |
| Hard rubber | 1013 − 1016 | |
| Ebonite | 1015 − 1017 | |
| Diamond | 1012 − 1013 | |
| Paper (dry) | 1012 | |
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Carbon exists in the atmosphere in the form of ______.
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Structural formula of benzene is
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Vinegar is a solution of
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Which is the correct sequence of the components of a reflex arc?
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