Science chapter1

Answer very briefly. 

1. Define measurement. 

It is defined as the determination of the size or magnitude of a quantity

Image             Video            News

2. Define standard unit. 

It is defined as a specific magnitude of a physical quantity that has been adopted by law or convention

Image             Video            News

3. What is the full form of SI system?

International System of Units

Image             Video            News

4. Define least count of any device. 

The smallest length which can be measured by metre scale is called least count.

Image             Video            News

5. What do you know about pitch of screw gauge? 

The pitch of the screw is the distance moved by the tip of the screw for one complete rotation of the head. It is equal to 1 mm in typical screw gauges.

Image             Video            News

6. Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?

1.No a ruler cannot measure diameter.It can only measure length.

2. The diameter of a thin wire can be measured using a screw gauge

Image             Video            News

Answer briefly

1. Write the rules that are followed in writing the symbols of units in SI system. 

Image             Video            News

2. Write the need of a standard unit. 

Image             Video            News

3. Differentiate mass and weight. 

Image             Video            News

4. How will you measure the least count of vernier caliper?

Image             Video            News

Answer in detail

1. Explain a method to find the thickness of a hollow tea cup. 

1. The thickness of a hollow tea cup can be determined using a screw gauge

2. Determine the pitch, the least count and the zero error of the screw gauge

3. Place the tea cup between the measuring faces

4. Rotate the head until the cup is held firmly with the help of ratchat

5. Note the PSR and HSR value

6. The thickness of the cup is given by PSR+CHSR( corrected HSR)

7. Repeat the experiment for different positions of the cup

8. Tabulate the readings 

9. Take the average value to minimise error

Image             Video            News

2. How will you find the thickness of a one rupee coin? 

1. The thickness of a one rupee coin can be determined using a screw gauge

2. Determine the pitch, the least count and the zero error of the screw gauge

3. Place the coin between the measuring faces

4. Rotate the head until the coin is held firmly with the help of ratchat

5. Note the PSR and HSR value

6. The thickness of the cup is given by PSR+CHSR( corrected HSR)

7. Repeat the experiment for different positions of the coin

8. Tabulate the readings 

9. Take the average value to minimise error

Image             Video            News