Assertion: For cooking in a microwave oven, food is always kept in metal containers

Reason: The energy of microwave is easily transferred to the food in metal container

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

The displacement current flows in the dielectric of a capacitor when the potential difference between its plates:-

1.  is changing with time.

2.  is changing with distance.

3.  becomes zero.

4.  has assumed a constant value.

The magnitude of electric field at 10 meter distance apart from a source is 100 volt/meter in electromagnetic waves being emitted by a point source. The electric field at point 20 meter from the source will be :

1. 100 volt/m                                                   2. 200 volt/m

3. 50 volt/m                                                    4. 25 volt/m

The sun light strikes the upper atmosphere of earth with intensity 1.38 Kw/$m^2$. The peak value of electric field at that point will be- (in kilovolt/meter)

1. 2.04                                 2. 4.08

3. 8.16                                 4. 1.02

Which of the following rays are not electromagnetic waves?
1. $\mathrm{\gamma }$-rays

2. $\mathrm{\beta }$-rays

3. Heat rays

4. X-rays

What is the magnitude of momentum that is contained in a unit volume for an electromagnetic wave:

1.  $\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}}$

2.  ${\mathrm{\epsilon }}_0 \left(\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}}\right)$

3.  ${\mathrm{\mu }}_0 \left(\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}}\right)$

4.  $\sqrt{{\mathrm{\mu }}_0{\mathrm{\epsilon }}_0} \left(\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}}\right)$

Out of the following options which one can be used to produce a propagating electromagnetic wave?

Which of the following statement is false for the properties of electromagnetic waves?