MCQ
Which of the following is a natural magnet?
  • A
    Magnetic needle
  • B
    Bar magnet
  • C
    Magnetite
  • D
    Horseshoe magnet

Answer

  1. Magnetite

Explanation:

Pieces of naturally occurring iron ore, lodestone or magnetite had the property of attracting small pieces of iron. Hence, magnetite is a natural magnet. All natural magnets are permanent magnets, meaning they will never lose their magnetic power.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

One cannot see through fog because .......... :

Two identical thin rings each of radius R meters are coaxially placed at a distance R meters apart. If Q1 coulomb and Q2 coulomb are respectively the charges uniformly spread on the two rings, the work done in moving a charge qfrom the centre of one ring to that of other is

(a) Zero

(b)  

(c)

(d)

A body has – 80 micro coulomb of charge. Number of additional electrons in it will be

(a) 8  

(b) 80  

(c) 5  

(d) 1.28  

 If a variable frequency ac source is connected to a capacitor then with decrease in frequency the displacement current will:

A resistance of 4  and a wire of length 5 metres and resistance 5  are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1. A parallel combination of two identical cells is balanced across 300 cm of the wire.  The e.m.f. E of each cell is

(a) 1.5 V 

(b) 3.0 V

(c) 0.67 V   

(d) 1.33 V

Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are   and  respectively the charge which flows through the silver voltameter is

(a)   

(b)

(c)    

(d)

On what basis is the classification of electromagnetic waves done?

Four capacitors are connected as shown in the figure. Their capacities are indicated in the figure. The effective capacitance between points x  and y  is (in μF)

(a)   

(b)  

(c)   

(d) 2

Consider the following statements and select the incorrect statement(s).
  1. The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.
  2. A coil of a metal wire kept stationary in a non– uniform magnetic field has an e.m.f induced in it.
  3. A charged particle enters a region of uniform magnetic field at an angle of 85° to the magnetic lines of force, the path of the particle is a circle.
  4. There is no change in the energy of a charged particle moving in a magnetic field, although a magnetic force is acting on it.
    A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may represent the plot?