🌈 Rainbow mind map and MCQ of Length

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Rainbow 🌈 mind map Length

Definition: Distance between two points.

Quantity: Fundamental quantity

Units: CGS- cm , MKS - m  , FPS - foot  , SI- m

Relations:   1 m = 100cm 

                    1 foot =30.48 cm

Multiple units: hm , km

Submultiple units: mm , cm

Devices' Least Count:

• Ruler; L.C = 1mm = 0·1cm
• Vernier calipers; LC=0.1 mm = 0·01cm
• Screw gauge; LC=0.01 mm = 0.00l.cm

Indirect measurements:

1. Diameter of a sphere

Diameter of a sphere

2. Measuring the length of a curve

Measuring the length of a curve 

3. Measuring the thickness of a coin

Measuring the thickness of a coin

4. Measuring the thickness of a wire

Measuring the thickness of a wire

Rainbow 🌈 MCQ
 Topic - Length

 

1. Length is distance between 

 A) two lines
 B) two points 
 C) two cities 
 D) two countries 

ANSWER= (B) two points 
Explain:- Length is distance between two points. 

 

2. Length is 

 A)vector quantity 
 B) derived quantity 
 C) Fundamental quantity 
 D) not a physical quantity 

ANSWER= (C) Fundamental quantity 
Explain:-  Length is a fundamental quantity 

 

3. S.I unit of Length is

 A) cm
 B) foot
 C) m
 D) M

ANSWER= (C) m
Explain:- S.I unit of Length is m

 

4. 1.5 m = _______ 

 A) 15 cm
 B) 1500 cm 
 C) 15000 cm
 D) 150 cm

ANSWER= (D) 150 cm
Explain:- 1.5 m = 150 cm

 

5. 56.2 km = ______ m

 A) 56200 
 B) 562
 C) 562000
 D) 5620

ANSWER= (A) 56200 
Explain:-  56.2 km = 56200 m

 

6. Least count of ruler

 A) 1 mm 
 B) 1 cm 
 C) .01 cm
 D) 0.1 mm

ANSWER= (A) 1 mm
Explain:- Least count of ruler is 1 mm.

 

7. To measure thickness of a coin , make a pile of 10 similar coins, thickness of a coin =

 A) Thickness of 10 coins ÷ 10
 B) Thickness of 10 coins + 10
 C) Thickness of 10 couns - 10
 D) Thickness of 10 coins x 10

ANSWER= (A) Thickness of 10 coins ÷ 10

Explain:- To measure thickness of a coin , make a pile of 10 similar coins, thickness of a coin = Thickness of 10 coins ÷ 10

 

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