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.

Given, Length of the iron block l = 2 m Breadth of the iron block b = 0 . 5 m Height of the iron block h = 0 . 25 m Density of iron d = 7 . 8 g cm - 3 = 7 . 8 × 1000 = 7800 kg m - 3 The volume of the block V = l × b × h = 2 × 0 . 5 × 0 . 25 = 0 . 25 m 3 Therefore, the mass M of iron block is, M = V × d = 0 . 25 × 7800 M = 1950 kg

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How is relative density of a liquid determined by density bottle?

Important Questions on Physical Quantities and Measurement

MEDIUM

Science>Physics>Physical Quantities and Measurement>Relative Density

A jar is filled with two non-mixing liquids $1$ and $2$ having densities $d_{1}$ and $d_{2}$ , respectively. A solid ball, made of a material of density $d_{3}$ , is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for $d_{1}$ , $d_{2}$ and $d_{3}$ ?

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EASY

Science>Physics>Physical Quantities and Measurement>Relative Density

The density of kerosene is

800 kg m^{- 3}

. Its relative density is

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Science>Physics>Physical Quantities and Measurement>Relative Density

The volume of

50 g

of a substance is

20 {cm}^{3}

. If the density of water is

1 g {cm}^{- 3}

will the substance float or sink?

EASY

Science>Physics>Physical Quantities and Measurement>Relative Density

A cork has a volume of

25 {cm}^{3}

. The density of cork is

0.25 g {cm}^{- 3}

. Find the mass of cork.

MEDIUM

Science>Physics>Physical Quantities and Measurement>Relative Density

How does the density of water changes when it is heated from

0 ° C

4 ° C

EASY

Science>Physics>Physical Quantities and Measurement>Relative Density

While determining the density of the material of body a student recorded the following observations:

(i) Mass of the body $= 62.4 g$

(ii) Reading of water level in the measuring cylinder without body $16.4 mL$

(iii) Reading of water level in the measuring cylinder with body $= 24.4 mL$ . Based on these observations, the density of material of the body in $kg m^{- 3}$ is

MEDIUM

Science>Physics>Physical Quantities and Measurement>Relative Density

A block of iron has dimensions

2 m \times 0.5 m \times 0.25 m

. The density of iron is

7.8 g {cm}^{- 3}

. Find the mass of block.

MEDIUM

Science>Physics>Physical Quantities and Measurement>Relative Density

The volume of a

500 g

sealed packet is

350 {cm}^{3}

. Will the packet float or sink in water if the density of water is

1 g {cm}^{- 3}

? What will be the mass of the water displaced by this packet?

EASY

Science>Physics>Physical Quantities and Measurement>Relative Density

For determining the density of a copper piece using a spring balance and a measuring cylinder, Seema carried out the following procedure:
i. Noted the water level in the measuring cylinder without the copper piece.
ii. Immersed the copper piece in the water.
iii. Noted the water level in the measuring cylinder with the copper piece inside it.
iv. Removed the copper piece from the water and immediately weighed it using a spring balance.
The wrong step in the procedure is

HARD

Science>Physics>Physical Quantities and Measurement>Relative Density

Arrange the following substances in order of their increasing density: (a) iron, (b) cork, (c) brass, (d) water and (e) mercury.

EASY

Science>Physics>Physical Quantities and Measurement>Relative Density

The mass of an iron ball is