Explore topic-wise InterviewSolutions in .

D) North and South poles are found to exist separately

Correct option is C) Directional

(i) A cylindrical magnet has only one pole. (False)
(ii) Artificial magnets were discovered in Greece. (False)
(iii) Similar poles of a magnet repel each other. (True)
(iv) Maximum iron filings stick in the middle of a bar magnet when it is brought near them. (False)
(v) Bar magnets always point towards North-South direction. (True)
(vi) A compass can be used to find East-West direction at any place. (True)
(vii) Rubber is a magnetic material. (False)

B) that is not a magnet, but a magnetic substance

(i)  True 

(i)  False

1. Magnets attract magnetic materials. 

2. A magnet always has two ends whose attracting capacity is more than the parts of it. The poles of the magnet lie at these birds. 

3. Each magnet has two magnetic poles: North and South. 

4. Like Poles (N-N, S-S) repel each other and unlike poles (N-S, S-N) attract each other. 

5. A freely suspended magnet always aligns in the North-South direction.

6. Magnets lose their properties if they are heated or dropped from a height hit with a hammer.

Magnetism gets destroyed when a magnet is heated, thrown, knocked about or broken into pieces. A magnet keeper which is a bar of soft or pure iron protects a magnet.

The directional property of the magnet is used to make the magnetic compass.

Correct option is D) directive property

(i) False 

(ii)  False

A freely suspended magnet always come to rest in north and south directions. This property of magnets is called a directional property.

Correct option is D) all of these

Correct option is B) boiling

1. Magnets which do not lose their magnetism easily are called permanent magnets or Magnets which are made up of magnetic substances are permanent magnets. 

2. e.g. Magnets fixed in a pin holder, magnets of a door of a cupboard are permanent magnets.

3. Permanent magnets are made from a mixture of

• Nickel, cobalt, iron
• Aluminium, nickel, cobalt – alnico

(i) Artificial magnets are made in different shapes such as bar-magnet, cylindrical magnet and horse-shoe magnet.
(ii) The Materials which are attracted towards a magnet are called magnetic material.
(iii) Paper is not a magnetic material.
(iv) In olden days, sailors used to find direction by suspending a piece of bar-magnet.
(v) A magnet always has two poles.

(i) Paper is not a Magnetic material. 

(ii) In olden days, sailors used to find direction by suspending a piece of Magnet. 

(iii) A magnet always has Two poles.

A) Both (i) and (ii) are correct

1. Magnets have a variety of shapes depending on their uses. 

2. They are bar magnets, disc magnets, horseshoe magnets, ring shaped magnets, cylindrical magnets, and small button magnets.

Today, magnets are used in many machines, gadgets and devices. They are all man-made. Hence, they can have a variety of shapes depending upon their use.

(i) Artificial magnets are made in different shapes such as Bar magnets, horse shoe & ball ended magnets. 

(ii) The material which are attracted towards a magnet are called Magnetic materials.

We use the thread to measure the length of a curved line.

Correct option is B) km

Correct option is B) mm²

Long-distance is measured by kilometers. 

1 kilo meter = 100 meters

The cube is a measurement of 1 cm length 1cm breadth and 1cm of Height.

The cubit can’t be used as a standard unit of length, because the length of the hand or cubit is not equal for all of the people.

Kilo meter is a suitable unit to measure long distances.

Correct option is C) 0’ — 180’

The perimeter of the bucket and perimeter of Kadai or Tava having curved paths.

France made the first scale and now it is in France museum.

Correct option is D) France

Correct option is C) Thread

Platinum and iridium.

Correct option is D) One meter

Meter is the standard unit of length.

The conventional methods of measurement are Foot – space, Hand – space, and Cubit.

The standard unit of volume of a solid cm³.

Yes, we are able to measure the volume of loose solids.

Volume is a measure of extent space that occupy a body. Apart from the measuring of volume of liquids we also measure the volumes of solids like sand and clay.

• We use measuring cylinders to measure the volume of liquids as milk, kerosene and oil. 
• The volume of liquid is expressed in liters or in ml.

Accuracy is not important in measuring the jasmine string. Various in measurement is negligible in this trade. So, there is no problem by using hand measurement in this aspect. And this is also an old tradition of our country that will be continued.

• The meter scale is an internationally accepted instrument for measuring length. 
• This avoids a lot of problems in international trades and commerce. 
• The length measures with the meter is constant anywhere in the world.

• A measuring cylinder is a tubular structure with graduations marked on the body. 
• We can fill it with liquid and can read markings at the lowest point of the concave surface of the liquid. 
• Measuring cylinders are available in different sizes. 
• They are used in laboratories to measure a certain volume of liquids like milk, oil etc.

• In our day-to-day work, we use a wooden/plastic scale to measure lengths. 
• It is marked or graduated in centimeters and millimeters. 
• Take a scale. The zero mark on the scale is made to coincide with one end of the table. 
• And the reading at the point which is coinciding with the other end of the table is taken. 
• Since a meter-scale has some thickness, we may make an error if the eye is not correctly positioned. 
• The correct position of the eye is which is vertically above the end where the reading is to be taken.

• In France, it was decided that a certain length of rod made of a special material (Platinum-Iridium) would be called a meter. 
• The meter was divided into 100 equal parts called centimeters. 
• Each centimeter was further divided into ten equal parts called millimeters. 
• Now we are using this as a standard measurement for length throughout the world. 
• This original scale is preserved in a museum in France.

Person height is 1.85 m 

1 meter = 100 cm 

1.85 m = 1.85 x 100 = 185 cm 

We know that 1 meter = 1000 mm 1.85m = 1.85 x 1000 mm = 1850 mm

The zero marks on the scale are made to coincide with one end of the table and the reading at the point which is coinciding with the other end of the table is taken. 

Since a meter scale has some thickness. 

We may make an error if the eye is not correctly positioned. 

The correct position of the eye is vertically above the end where the reading is to be taken.

Milli meters.

Graph paper.

1. A. length

2. A. kilometre

3. A. area