Bissoy.com
Doctors Medicines MCQs Q&A

There are four light-weight-rod samples, A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted  (i) A is feebly repelled  (ii) B is feebly attracted  (iii) C is strongly attracted  (iv) D remains unaffected  Which one of the following is true?

There are four light-weight-rod samples, A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted  (i) A is feebly repelled  (ii) B is feebly attracted  (iii) C is strongly attracted  (iv) D remains unaffected  Which one of the following is true? Correct Answer B is of a paramagnetic material

CONCEPT :

  • Magnetic materials are broadly classified into
  1. Paramagnetic
  2. Diamagnetic
  3. Ferromagnetic based on the intensity of magnetization 
  • The given table below shows the behavior of each material in the external magnetic field.

Characteristics

Paramagnetic

Diamagnetic

Ferromagnetic

Behavior in Magnetic field

When placed in a magnetic field get feebly magnetized in the direction of the applied field. 

These feebly magnetized materials tend to move from weaker to the stronger region of the magnetic field.

When placed in a magnetic field gets feebly magnetized in the direction of the applied field.

When placed in a magnetic field get strongly magnetized in the direction of the applied field.

Examples

Al, Na, Cucl2

Cu, Pb, Sn 

Fe, Co, Gd 

 

 

 

 

 

 

 

 

 

EXPLANATION:

Given observations are (i) A is feebly repelled, (ii) B is feebly attracted,(iii) C is strongly attracted, (iv) D remains unaffected

  • As per observation (i), A is feebly repelled, thus it is clear that A is a magnetic material. Hence option one is incorrect.
  • As per observation (ii), B is feebly attracted, thus it is clear that B is a magnetic material and since it is feebly attracted by the magnetic field it can be assumed that the magnetization in the direction of the external field.
  • A paramagnetic material is feebly magnetized in the direction of external and is attracted to the external magnetic field. The observations of material B match with properties of paramagnetic material. Hence material B has to be paramagnetic in nature. Hence option 2 is correct.
  • As per observation (iii), C is strongly attracted, thus it is clear that material C is strongly magnetized this observation matches with the property of ferromagnetic material. Because due to strong magnetization ferromagnetic material gets attracted to the external magnetic field. Hence C is a ferromagnetic material. From the above observations, it is clear that Option 3 is incorrect.
  • As per observation (iv) D remains unaffected, then D is a non-magnetic material hence option 4 is wrong.
  • Option 2 is only true rest is false 

Related Questions

User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads. Which of the following statements is/are true ? (a) (i) The Many - to - one model maps many user threads to one kernel thread (ii) The one - to - one model maps one user thread to one kernel thread (iii) The many - to - many model maps many user threads to smaller or equal kernel threads (b) (i) Many - to - one model maps many kernel threads to one user thread (ii) One - to - one model maps one kernel thread to one user thread (iii) Many - to- many model maps many kernel threads to smaller or equal user threads
In which of the following case we can surely say that the body A is charged: a) When a positively charged body is kept near to body A and it gets attracted b) When a negatively charged body is kept near to body A and it gets  attracted c) When a positively charged body is kept near to body A and it gets repelled
The median for an odd number of observations is _________ where n is the number of observations. rank on the ascending order of observations b) rank on the ascending order of observations c) Average of and (n/2) rank on the ascending order of observations d) (n/2) rank on the ascending order of observations
A teacher asks students to suggest a method to demagnetise a magnet. Some responses are: A) "dropping a magnet on floor several times" B) "breaking the magnet into 2 halves" C) "heating the magnet" D) "throwing the magnet in water" E) "by hammering it" Which of the following are correct?
Which one of the following is feebly repelled by a magnet?
A student was studying primate uterine thickness. She had 3 samples of uterine tissues. The thickness in mm for the samples are as follows: Sample A – 4 mm, Sample B – 10 mm, Sample C – 1 mm Given the knowledge of menstrual cycle in humans, what phases do you think each sample belongs to?
How does number of observations influence overfitting? Choose the correct answer(s).Note: Rest all parameters are same
1. In case of fewer observations, it is easy to overfit the data.
2. In case of fewer observations, it is hard to overfit the data.
3. In case of more observations, it is easy to overfit the data.
4. In case of more observations, it is hard to overfit the data.
With reference to the properties of magnetism, consider the following statements: 1. A natural magnet is an oxide of iron. 2. When a magnet is freely suspended, its one pole is always directed towards the north. 3. The middle part of the magnet has maximum magnetic power. 4. Similar poles repel each other and dissimilar poles attract each other. Which of the statements given above is/are correct?
Which of the following statements are true regarding diamagnetic substances? (i) Diamagnetic substances are feebly repelled by magnets (ii) Diamagnetic substances move from stronger field side to weaker field side (iii) Permeability of diamagnetic substances is greater than one. (µ > 1)
A metal when brought near the end of a strong magnet, it gets repelled. This metal is: