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1. A
   The ring has higher kinetic energy
2. B
   The disc has higher kinetic energy
3. C
   The ring and the disc have the same kinetic energy
4. D
   Kinetic energies of both the bodies are zero since they are not in linear motion

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   Thermal conduction
2. B
   Thermal convection
3. C
   Thermal radiation
4. D
   Both, thermal conduction and radiation

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1. A
   Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it.
2. B
   A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference.
3. C
   A conducting material obeys Ohm's law when the resistance of material is independent of the magnitude and direction of applied electric field.
4. D
   All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong.

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1. A
   Its speed
2. B
   Its momentum
3. C
   Its kinetic energy
4. D
   Its potential energy

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1. A
   $\text{Pb}_3\text{O}_4$
2. B
   $\text{Fe}_3\text{O}_4$
3. C
   $\text{Fe}_2\text{O}_3$
4. D
   $\text{Mn}_3\text{O}_4$

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1. A
   Glass is often said to be a supercooled liquid.
2. B
   Glass has no definite melting point.
3. C
   Soda glass is harder than pyrex glass.
4. D
   Boron is present in pyrex glass.

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1. A
   Both boiling and evaporation are surface phenomena.
2. B
   Boiling is a surface phenomenon, but evaporation is a bulk phenomenon.
3. C
   Both boiling and evaporation are bulk phenomena.
4. D
   Boiling is a bulk phenomenon, but evaporation is a surface phenomenon.

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1. A
   Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure.
2. B
   Both physical and chemical properties of diamond and graphite are different.
3. C
   Graphite is soft but diamond is hard.
4. D
   Graphite is a good conductor of electricity while diamond is not.

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1. A
   Lime, silica and sulphur dioxide
2. B
   Lime, silica and carbon dioxide
3. C
   Lime, silica and alumina
4. D
   Lime, silica and boric acid

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