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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?
Consider the following statements regarding removal of impurities from water: 1. Settleable solids are removed by filtration. 2. Volatile solids are removed through sedimentation. 3. Dissolved solids are removed through reverse osmosis. 4. Colloidal solids are removed by coagulation. Which of the above statements are correct?
In a batch process, the reaction takes place in the presence of an acid medium. The acid is drained from the reaction vessel at the rate of 15ml/s as a result of the density difference of the acid from the reacting component. To avoid wastage of acid, it is recycled to an acid tank which has 1000 L capacity. The acid drained from the reaction vessel, picks up 50 g/L solids from the reactor. Acid is fed once again to the process from acid tank. When the process is started, the acid is almost pure in the tank as a result of filtration. As the reaction proceeds, acid in the tank gets more and more contaminated with the solids. The concentration of the solids should not exceed 100 g/L from the process point of view. The batch time is 16h. Estimate whether the concentration of the solids will exceed 100g/L during the batch reaction.
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?
When is a ceramic magnet used as a permanent magnet in a permanent magnet DC motor?
If a bicycle is called a bottle, a bottle is called a telephone, a telephone is called a magnet and a magnet is called a compass, then what shall we use to make a call?
Which of the following material is repelled by a magnet?
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?
Which one of the following is feebly repelled by a magnet?
A metal when brought near the end of a strong magnet, it gets repelled. This metal is: