Physical Quantities and Measurements Test

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Physical Quantities and Measurements Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Use the following information to answer the next question.

A piece of silver of volume 20 cm³ has a mass of 206 g.

What is the density of silver?

A
5.6 g/cm³

B
7.3 g/cm³

C
10.3 g/cm³

D
20.6 g/cm³

Solution

.Volume of the silver, V = 20 cm³

Mass of silver, m = 206 g

Density of silver, d = Mass / Volume = 206/ 20 = 10.3 g/cm³
Question 2
1 / -0

The correct descending order of the densities of milk, honey, and oil is

A
oil > honey > milk

B
honey > milk > oil

C
honey > oil > milk

D
milk > honey > oil

Solution

Honey is denser than milk, which in turn, is heavier than oil. Hence, the correct order of their densities is honey > milk > oil.
Question 3
1 / -0

Use the following information to answer the next question.

A block of metal of dimension 5 cm, 3 cm and 10 cm has a mass of 2.4 kg.

The density of the block is

A
16 g/cm³

B
32 g/cm³

C
48 g/cm³

D
64 g/cm³

Solution

.The dimension of a metal are 5 cm, 3 cm and 10 cm.

Volume of the metal block is 5 cm× 3 cm ×10 cm = 150 cm³

Mass of the block is 2.4 kg = 2400 g

The density of a block is defined as the mass per unit volume of that block.

∴Density = Mass / Volume = 2400/150 = 16 g/cm³.
Question 4
1 / -0

Use the following information to answer the next question.

The densities of four objects are shown in the given table. Equal quantities of these objects are immersed in a jar filled with mercury (ρ = 13.59 g cm⁻³).

Object Density (g/cm³)

I 0.34

II 7.87

III 0.86

IV 2.56

It will be observed that

A
all the four objects sink in mercury

B
all the four objects float in mercury

C
objects I and III float, while objects II and IV sink in mercury

D
objects II and IV float, while objects I and III sink in mercury

Solution

An object floats in a liquid if its density (or average density) is less than that of the liquid.

In the given situation, all the four objects have densities less than that of mercury. Hence, all four will float in mercury.
Question 5
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Choose the correct statement from the given options.

A
The buoyant force acting on a body is equal to the volume of the immersed part of the body.

B
The buoyant force acting on a body is equal to the volume of the liquid displaced by the immersed part of the body.

C
The buoyant force acting on a body is equal to the weight of the liquid displaced by the immersed part of the body.

D
The buoyant force acting on a body is always equal to the weight of the body.

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Object	Density (g/cm³)
I	0.34
II	7.87
III	0.86
IV	2.56

Physical Quantities and Measurements Test - 1

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Physical Quantities and Measurements Test - 1

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Question 1

5.6 g/cm3

7.3 g/cm3

10.3 g/cm3

20.6 g/cm3

Solution

Question 2

oil > honey > milk

honey > milk > oil

honey > oil > milk

milk > honey > oil

Solution

Question 3

16 g/cm3

32 g/cm3

48 g/cm3

64 g/cm3

Solution

Question 4

all the four objects sink in mercury

all the four objects float in mercury

objects I and III float, while objects II and IV sink in mercury

objects II and IV float, while objects I and III sink in mercury

Solution

Question 5

The buoyant force acting on a body is equal to the volume of the immersed part of the body.

The buoyant force acting on a body is equal to the volume of the liquid displaced by the immersed part of the body.

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

The buoyant force acting on a body is always equal to the weight of the body.

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5.6 g/cm³

7.3 g/cm³

10.3 g/cm³

20.6 g/cm³

16 g/cm³

32 g/cm³

48 g/cm³

64 g/cm³