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Assertion : One should not use metal con...

Assertion : One should not use metal containers in a microwave oven
Reason : Only because metal may melt form heating.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
C
One should use porcelain vessels and not metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metal may also melt from heating.
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Knowledge Check

  • One strould use porcelain and tol metal containers in a truicrowave oven because... A. Charge may accumulate on the metal surface and there is danger of getting a shock B. Porcelain vessels are better conductors of heat and thus food gets cooked quickly. C. Melal containers might undergo chemical reaction leading to spoilage of food. D. Porcelain vessels are cheaper than the metal containers.

    A
    A
    B
    B
    C
    C
    D
    D

  • Read the following text and answer the following questions on the basis of the same: Microwave oven: The spectrum of electromagnetic radiation . contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which is shared by the entire food. As compared to visible light microwave has frequency and energy

    A
    more than visible light.
    B
    less than visible light.
    C
    equal to visible light.
    D
    Frequency is less but energy is more

  • The set containing only transition metals is

    A
    Ti, Nb, Ra
    B
    Pd,lr, Ta
    C
    Ag,Au,In
    D
    W,Pt,Po

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