Physics
Which one of the following is not a property of electromagnetic waves?

Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves are transverse waves
Electromagnetic waves do not require a medium to propagate.

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a good conductor of heat but a bad conductor of electricity
a good conductor of heat as well as electricity
a bad conductor of heat as well as electricity
a bad conductor of heat but a good conductor of electricity

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.

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