#### Chapters

Chapter 2: Motion

Chapter 3: Energy

Chapter 4: Light Energy

Chapter 5: Heat

Chapter 6: Sound

Chapter 7: Electricity and Magnetism

#### Selina Selina Concise Physics - Middle School Class 7

## Chapter 1: Physical Quantities and Measurement

#### Selina solutions for Class 7 Physics Chapter 1 [Page 0]

Write true or false for a given statement

The S.I. unit of volume is the litre.

Write true or false for a given statement

A measuring beaker of capacity 200 ml can measure only the volume. 200 ml of a liquid.

Write true or false for a given statement

cm2 is a smaller unit of area than m^{2}.

Write true or false for a given statement

Equal volumes of two different substances have equal masses.

Write true or false for a given statement

The S.I. unit of density is g cm^{-3}.

**Write true or false **

1 g cm^{-3} = 1000 kg m^{-3}.

**Write true or false**

The density of water is maximum at 4°C.

**Write true or false**

The speed 5 ms^{-1} is less than 25 km h^{-1}.

**Write true or false **

The S.I. unit of speed is ms^{-1}.

**Fill in the blank**

l m^{3} =..........cm^{3}

** Fill in the blank**

he volume of an irregular solid is determined by the method of .................................

**Fill in the blank**

Volume of a cube = ...........

** Fill in the blank**

The area of an irregular lamina is measured by using a .............

** Fill in the blank**

Mass = density × ..............

**Fill in the blank**

The S.I. unit of density is ..........

** Fill in the blank**

1 g cm^{-3} = ...............kg m^{-3}.

**Fill in the blank**

36 km h^{-1} = ...... ms^{-1}.

** Fill in the blank**

Distance travelled d = .............× time t

**Match the following**

1.Volume of a liquid | 1. kg `m^-3` |

2. Area of a leaf | 2. `m^3` |

3. S.I. unit of volume | 3. graph paper |

4. S.I. unit of density | 4. m `s^-1` |

5. S.I.unit of speed | 5. measuring cylinder |

Select the correct alternative

One litre is equal to :

- 1 cm
^{-3} - 1 m
^{3} - 10
^{-3 }cm^{3} - 10
^{-3}m^{3}

Select the correct alternative

A metallic piece displaces water of volume 15 ml. The volume of piece is :

- 15 cm
^{3} - 15 m
^{3} - 15 × 10
^{3}cm^{3} - 15 × 10
^{3}cm

Select the correct alternative

A piece of paper of dimensions 1.5 m x 20 cm has area :

- 30 m2
- 300 cm2
- 0.3 m2
- 3000 m3

**Select the correct alternative **

The correct relation is :

- d = M × V
- M = d × V
- V = d × M
- d = M + V

**Select the correct alternative **

The density of alcohol is 0.8 g cm-3. In S.I. unit, it will be :

- 0.8 kg m
^{-3} - 0.0008 kg m
^{-3} - 800 kg m
^{-3} - 8 x 10
^{3}kg m^{-3}

** Select the correct alternative **

The density of aluminium is 2.7 g cm-3 and of brass is 8.4 g cm^{-3}. For the same mass, the volume of:

- both will be same
- aluminium will be less than that of brass
- aluminium will be more than that of brass
- nothing can be said.

**Select the correct alternative **

A block of wood of density 0.8 g cm^{-3} has a volume of 60 cm^{3}. The mass of block will be :

- 60.8 g
- 75 g
- 48 g
- 0.013

**Select the correct alternative **

The correct relation for speed is

- Speed = distance x time
- speed = distance / time
- speed = time / distance
- speed = 1 / distance x time

**Select the correct alternative **

A boy travels a distance 150 m in 1 minute. His speed is

- 150 m s
^{-1} - 2.5 m s
^{-1} - 25 m s
^{-1} - 9 m s
^{-1}

#### Selina solutions for Class 7 Physics Chapter 1 [Page 0]

Define the term volume of an object.

State and define the S.I. unit of volume.

State two smaller units of volume. How are they related to the S.I. unit?

How will you determine the volume of a cuboid ? Write the formula you will use.

Name two devices which are used to measure the volume of an object. Draw their neat diagrams.

How can you determine the volume of an irregular solid (say a piece of brass) ? Describe in steps with neat diagrams.

You are required to take out 200 ml of milk from a bucket full of milk. How will you do it ?

Describe the method in steps to find the area of an irregular lamina using a graph paper.

Define the term density of a substance.

State the S.I. and C.G.S. units of density. How are they inte related ?

‘The density of brass is 8.4 g cm’3’. What do you mean by the statement ?

Arrange the following substances in order of their increasing density:

(a) iron

(b) cork

(c) brass

(d) water

(e) mercury

How does the density of water changes when it is heated from 0°C to 4°C,

How does the density of water changes when it is heated from 4°C to 10°C ?

Write the density of water at 4°C.

Explain the meaning of the term speed.

Write the S.I. unit of speed.

A car travels with a speed 12 m s”1, while a scooter travels with a speed 36 km h-1. Which of the two travels faster ?

#### Selina solutions for Class 7 Physics Chapter 1 [Page 0]

The length, breadth and height of a water tank are 5 m, 2.5 m and 1.25 m respectively. Calculate the capacity of the water tank in (a) m^{3} (b) litre.

A solid silver piece is immersed in water contained in a measuring cylinder. The level of water rises from 50 ml to 62 ml. Find the volume of silver piece.

Find the volume of a liquid present in a dish of dimensions 10 cm x 10 cm x 5 cm.

A rectangular field is of length 60 m and breadth 35 m. Find the area of the field.

Find the approximate area of an irregular lamina of which boundary line is drawn on the graph paper shown in fig. 1.16. below.

A piece of brass of volume 30 cm^{3} has a mass of 252 g. Find the density of brass in (i) g cm^{-3}, (ii) kg m^{-3}.

The mass of an iron ball is 312 g. The density of iron is 7.8 g cm^{-3}. Find the volume of the ball.

A cork has a volume 25 cm^{3}. The density of cork is 0.25 g cm^{-3}. Find the mass of cork.

The mass of 5 litre of water is 5 kg. Find the density of water in g cm^{-3}.

A cubical tank of side 1 m is filled with 800 kg of a liquid. Find: (i) the volume of tank, (ii) the density of liquid in kg m^{-3}.

A block of iron has dimensions 2 m × 0.5 m × 0.25 m. The density of iron is 7.8 g cm^{-3}. Find the mass of block.

The mass of a lead piece is 115 g. When it is immersed into a measuring cylinder, the water level rises from 20 ml mark to 30 ml mark. Find the volume of the lead piece .

The mass of a lead piece is 115 g. When it is immersed into a measuring cylinder, the water level rises from 20 ml mark to 30 ml mark , Find the density of the lead in kg m^{-3}.

The density of copper is 8.9 g cm^{-3}. What will be its density in kg m^{-3} ?

A car travels a distance of 15 km in 20 minute. Find the speed of the car in km h^{-1}.

A car travels a distance of 15 km in 20 minute. Find the speed of the car in m s^{-1}.

How long a train will take to travel a distance of 200 km with a speed of 60 km h^{-1} ?

A boy travels with a speed of 10 m s^{-1} for 30 minute. How much distance does he travel ?

Express 36 km h^{-1} in m s^{-1}

Express 15 m s^{-1} in km h^{-1}.

## Chapter 1: Physical Quantities and Measurement

#### Selina Selina Concise Physics - Middle School Class 7

## Selina solutions for Class 7 Physics chapter 1 - Physical Quantities and Measurement

Selina solutions for Class 7 Physics chapter 1 (Physical Quantities and Measurement) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina Concise Physics - Middle School for Class 7 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 7 Physics chapter 1 Physical Quantities and Measurement are Measurement of Volume (3d Concept), Concept of Unit Volume, Measurement of Area, Estimate the Area of Irregular Shape Using a Graph Paper, Measurement of Densiy of Regular Solids - Basic Concept, Measurement of Density of Regular Solids - Formula, Concept of Physical Quantities and Measurement.

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