Explore topic-wise InterviewSolutions in .

(a) False The S.I. unit of volume is cubic metre.

(b) True

(c) True

(d) False Equalvolumes of two different substances have different masses.

(e) False The S.I. unit of density is Kg m-3.

(f) True

(g) True

(h) True

(i) True

The symbol of degree Celsius is °C.

(a) l m3 = 106 cm³ 

(b) The volume of an irregular solid is determined by the method of displacement of liquid. 

(c) Volume of a cube = (one side) 

(d) The area of an irregular lamina is measured by using a grapl paper. 

(e) Mass = density × volume. 

(f) The S.I. unit of density is kg m^-3. 

(g) 1 g cm^-3 = 1000 kg m^-3. 

(h) 36 km h^-1 = 10 ms^-1. 

(i) Distance travelled d = speed v × time t.

One litre is equal to :

4. 10^-3 m³

(a) The S.I. unit of length is metre of time is second of mass is kilogram.

(b) °C is the unit of temperature.

(c) 1 metric tonne = 1000 kg

(d) The zero mark in Celsius thermometer is the melting point of ice

(e) The thermometer used to measure the human body temperature is called the clinical thermometer.

(f) The normal temperature of human body is 37 °C or 98.6 °F.

(g) The mass of an object is measured with the help of a beam balance.

(a) False

(b) True

(c) True

(d) False

(e) True

Volume of a cuboid = length × breadth × height.

When a body floats in a liquid. The weight of the liquid displaced by its immersed part is equal to the total weight of the body.

The buoyant force on a body is equal to the weight of the liquid displaced by it.

(a) Water contracts on heating from 0°C to 4°C and expands on heating above 4°C. 

(b) The density of water is maximum at 4°C. It decreases when it is cooled from 4°C to 0°C or it is heated above 4°C.

the density bottle will store 25 ml of any liquid in it.

True A body experiences the same buoyant force while floating in water or alcohol.

When a given quantity of liquid is heated

(a) Mass: does not change.

(b) Volume: changes and increases with rising in temperature.

(c) Density: Changes and decreases.

Density = Mass / volume

The correct answer is:

48 g

The correct relation is :

2. M = d × Y

A smaller unit of volume is cubic centimetre (symbol cm³) and cubic decimetre (symbol 1 dm³). One cubic centimetre is the volume of a cube of each side 1 centimetre, i.e., 

1 cm³ = 1 cm × 1 cm × 1 cm. 

Relationship between m³ and cm³ 

1m³ = 1m × 1m × 1m 

= 100 cm × 100 cm × 100 cm 

= 10,00,000 cm³ = 106 cm³. 

Relationship between m³ and dm³ 

1 m³ = 1m × 1 m × 1 m = 10 dm × 10 dm × 10 dm = 1000 dm = 10³ dm 

Note 1 m = 10 dm

UNIT OF RELATIVE DENSITY: No units since it is a pure ratio.

Most of the liquids increase in volume with an increase in temperature, but water shows anomalous behavior. Water has the maximum volume at 4°C and maximum density at 4°C.

Actually, when volume increases density decreases and when volume decreases the density increases.

But water when cooled from a high temperature, contracts upto 4°C because volume decreases and expands when cooled further below 4°C and hence density of water increases when it is cooled upto 4°C while decreases when cooled further below 4°C. In other words, the density of water is maximum at 4°C equal to 1 g Cm^-3 or lOOO kg m^-3.

CORK floats on water means density of cork is LESS than density of water.

IRON nail: Sinks in water meAns density of iron nail is MORE than density of water.

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

3. 800 kg m^-3

The correct answer is:

800 kg m³

RELATIVE DENSITY: “is the ratio of density of a substance to the density of water at 4° C.”

Or

RELATIVE DENSITY “is the ratio of mass of the substance to the mass of an equal volume of water at 4° C.”

Cork, Water, Iron, Brass, Mercury.

Density of brass is 8.4 g cm^-3. This means that unit volume of brass contain 8.4 g mass.

 (b) cork < (a) iron <(c) brass < (d) water  <(e) mercury

Length of a rectangular field = 60 m 

Breadth of rectangular field = 35 m 

∴ Area = 60 m × 35 m = 2100 m²

By using the measuring beaker A measuring beaker is used to measure a fixed volume of liquid from a large volume. Suppose it is required to measure 200 ml of milk from the milk contained in a bucket. For this, take the measuring beaker of capacity 200 ml. Wash it and dry it. Then, immerse the measuring beaker well inside the milk contained in the bucket so that the beaker gets completely filled with the milk. Take out the measuring beaker from the bucket gently so that no milk splashes out and then pour the milk from the measuring beaker into the another empty vessel.

The density of a substance is defined as the mass of a unit volumx of that substance.

From figure, the number of complete squares = 11 

The number of squares more than half = 9 

∴ Total number of squares = 11 + 9 = 20 

∴ Area of the 1 square = 1 cm × 1cm = 1 cm²

∴ Area of 20 squares = 20 × 1 cm² = 20 cm² 

∴ Approximate area of irregular lamina = 20 cm²

Speed of car = 12 m s^-1 

Speed of scooter = 36 km h^-1 

here, 1 km = 1000 m 

1 hr = 3600 sec

Speed of scooter = 36 x1000 / 3600 =10 ms^-1

∴ Speed of car is more. Car travels faster than scooter.

S.I. units are as follows

We will use a measuring tape to measure the perimeter of our playground. To measure the length of playground the tape is spread along the length of the curved area.

3. measuring cylinder 

(c) meteorologist 

(c) Beam balance 

1. There are seven fundamental physical quantities. 

2. In the CGS system, length is measured in centimeters. 

3. 1 kilometre is equal to 1000 metres. 

4. The amount of matter contained in a body is known as its mass. 

5. The first two digits in a 24 hour time fomiat represent the number of hours. 

6. If the departure time of a train on a railway ticket is printed as 20:35, then it will depart at 8.35 p.m. 

7. The lower fixed point in a laboratory thermometer is the same as that of —10°C. 

8. The temperature at which water freezes is known as ice point.

Second (unit of time)

The error that can arise due to the wrong positioning of the eye while reading a scale is called parallax error.

When a body to be weighed is attached to the hook, the coil is stretched downwards. The distance through which the spring gets stretched is measured by a pointer and a graduated scale attached to the spring. The reading on the scale gives the weight of the object.

The S.I. unit of time is second. In short form we write it as ‘ S ’. One second is the time interval between the two consecutive ticks that you hear from pendulum wall clock.

1 min = 60 s 

1 h = 60 min. = 3600 s. 

1 day = 24 h = 86400 s. 

1 year = 365 days = 3.15 × 10⁷ s.

1. 3 minute = 15 second 

1 minute = 60 second 

3 minutes 15 second = 60 × 3 + 15 

= 180 + 15 

= 195 seconds

2. 1 minute =60 second 

2 minutes =2 × 600 = 120 second …...........(1) 

1 hour 3600 second

5 hour 3600 × 5 = 18000 second ….............(2) 

5 hour 2 minutes and 5 second 

= 18000 + 120 + 5 = 18125 seconds

The time shown in you analogue watch at the departure will be 9:50 p.m.

Mean solar day is the time taken by the earth to make one complete rotation about its own axis.

Aeroplane leaves Bengaluru at 11:50 p.m. 

and reaches Chennai at 12:40 a.m. 

Duration of the flight =50 minutes

Density of copper d = 8.9 g cm ^-3

= 8.9 x 1000 kg m^-3 

[:.  1 g cm^-3 = 1000 kg m^-3]

= 8900 kg m^-3

Length of each side = 50 m 

Area of square lawn side × side

= 50 x 50 m² 

= 2500 m²