Tag: physics

Questions Related to physics

According to  molecular orbital theory, the paramagnetism of $O _{2}$  molecule is due to presence of 

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. Unpaired electrons in the bonding $\sigma $ molecular orbital

  2. Unpaired electrons in the anti- bonding $\sigma $ molecular orbital

  3. Unpaired electron in the bonding $\pi $ molecular orbital

  4. Unpaired electrons in the anti - bonding $\pi $ molecular obrital

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Correct Option: A

Which of the following is paramagnetic  in nature ? 

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. $N _{2}$

  2. $C _{2}$

  3. $B _{2}$

  4. $O _{2}^{2+}$

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Correct Option: A

Substances in which the magnetic moment of a

single atom is not-zero

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. diamagnetic

  2. ferromagnetic

  3. paramagnetic

  4. electromagnetic

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Correct Option: C

An atom is paramagnetic if it has :

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. an electric dipole moment

  2. no magnetic moment

  3. a magnetic moment

  4. no electric dipole moment

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Correct Option: A

A paramagnetic substance when placed in an externally applied non-uniform magnetic field tends to ___________.

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. increase the applied field

  2. decrease the applied field

  3. vary the applied field

  4. change the applied field

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Correct Option: A
Explanation:

Paramagnetic substances are the substances which are feebly attracted by a magnet. When a non-uniform external magnetic field is applied to a paramagnetic substance the magnetic field tries to aligned the magnetic moment in the direction of the field 

Completely alignment is however not possible, on account of thermal vibration. A better allingement can be achieved by increasing the strength of the applied magnetic field.

 

When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. semi-magnetic.

  2. anti-ferromagnetic.

  3. paramagnetic.

  4. poly crystalline.

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Correct Option: C
Explanation:

When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as paramagnetic.in paramagnetism electrons are unpaired.

Liquid oxygen remains suspended between two pole forces of a magnet because it is:

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. diamagnetic

  2. paramagnetic

  3. ferromagnetic

  4. antiferromagnetic

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Correct Option: B
Explanation:

Oxygen is paramagnetic in nature. So if it will be attracted both by North pole or South pole. When it is placed exactly between two magnetic poles, the forces acting on it due to magnetic poles will be equal & opposite. Hence it will remain suspended between them.

A substance is placed in a non uniform magnetic field. It experiences weak force towards the strong field. The substance is _________ type.

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. Ferromagnetic

  2. Diamagnetic

  3. Paramagnetic

  4. None of these

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Correct Option: C
Explanation:

Paramagnetic substance has the property that when they are placed in an external magnetic field, they get weakly magnetised in the same direction as that of external magnetic field and are weakly attracted by the external magnetic field.
So, correct answer is option C.

State whether given statement is True or False.
Charges are incapable of passing from clouds to lightning rod.

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. True

  2. False

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Correct Option: B
Explanation:

Lightning rods helps to carry charge from cloud to earth, otherwise lightning rods will be of no use.

What are may happen if a building does not have earthing?

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. Lightning may strike a building due to opposite charge causing fir or damage to the building

  2. In the rainy season water increases the chances of lightning striking a building causing damage

  3. Both A & B

  4. None of the above

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Correct Option: B
Explanation:

Sometimes electric discharge can take place between the charged cloud and earth. While passing over a tree or a tall building an opposite charge may be induced causing a lightning to a building and if the charge is large it may cause severe damage and may prove to be fatal. In the rainy season water being a good conductor of electricity increases the chances of lightning striking a building.