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NCERT Class 9 Science Lab Manual –

Density of Solid
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NCERT Class 9 Science Lab Manual – Density of Solid Job Application Letter class 12 Samples
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To determine the density of solid (denser than water) by using a spring balance and a measuring cylinder. Unseen Passage For Class 6 Answers

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4. S.I. unit = Newton = 1 kg m/s2
N =1 kgf= 1 kilogram force, NEET Chemistry Chapter Wise Mock Test –
i.e g = 9.8 m/s2 Haloalkanes and Haloarenes
5. Weight is measured by spring balance.
NCERT Solutions for Class 12 Computer Science
(C++) – C++ Revision Tour
Materials Required
A spring balance, a measuring cylinder, a beaker with water, a metal bob (or any body that is heavier than
water and does not dissolve in water), a cotton string, a stand (optional).

Procedure

1. Tie a metal bob (or any solid) with the string of cotton to the hook of the spring balance. The spring
balance should be checked for any error. Let the zero error be ‘x’.
2. Hold the spring balance (or tie it to the stand), suspended with the metal bob in air. Measure the
weight of the bob. Let its weight be ‘WF‘
3. Pour the water in the measuring cylinder and record the initial volume of water, let it be ‘ V1‘
 4. Suspend the metal bob into the measuring cylinder with water. The bob should not touch the base,
NCERT SOLUTIONS TS GREWAL
nor the sides of the cylinder.
CBSE SAMPLE PAPERS NCERT EXEMPLAR PROBLEMS ENGLISH GRAMMAR MCQ QUESTIONS
The water level rises, measure the increased water level, let this volume be ‘ VF‘
5. Record all your observations in the observation table and do the calculation to find the density of a
given solid metal bob.

Observations

1. Weight of the given Metal Bob = 400N

2. Mass of the Metal Bob = 400/9.8 = 40.8 g

1. Volume of water displaced by solid (metal bob) = 20 mL.

= 2.04 g/cm3
40.8g
2. Density of a solid (metal bob) =
20ml
3
1 mL of water = 1 cm

Result
The density of given solid (Metal Bob) is 2.04 g/cm3

Precautions
 1. The spring balance should be sensitive.
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2. The SOLUTIONS TS GREWAL
zero error in the spring CBSE
balance should beSAMPLE PAPERS
recorded NCERT
before it is used to EXEMPLAR PROBLEMS
find the weight of solid. ENGLISH GRAMMAR MCQ QUESTIONS
3. Record the readings carefully of both spring balance and measuring cylinder by keeping the level of
eye and the mark of reading same/parallel.
4. The solid/metal bob should not touch the bottom, or sides of the measuring cylinder.
5. If the zero error in spring balance is 1 N then subtract this error from the final reading of the weight of
solid/ metal bob.

VIVA VOCE

Question 1:
Define density.
Answer:
Density is defined as the mass per unit volume.

Question 2:
State the S.I. unit of density.
Answer:
kg/m3.

PRACTICAL BASED QUESTIONS

Question 1:
How do you find mass and weight of the body?
Answer:
To find mass I will use a beam balance and to find weight I will use a spring balance.

Question 2:
How can you convert the weight value into mass?
Answer:
The weight of a body = mass x g, to get mass, divide the given weight by g.

Question 3:
How can you measure 1 N weight?
Answer:
It can be measured by using spring balance.

Question 4:
A measuring cylinder has 5 marks between 10 mL to 20 mL. What is its least count?
Answer:
20 mL – 10 mL =10 mL, Let ‘x; is the least count.
5 * x= 10
10
x= 5
=2
Each mark is of 2 mL value.

Question 5:
The density of a solid is 2.5 g/cm3. What does it mean?
Answer:
It means that 2.5 g of solid has a volume of 1 cm3

Question 6:
A rectangular body has dimensions x and y (/ and b). If its dimensions get doubled what will happen to its
volume?
Answer:
Suppose the dimensions of a rectangular solid is 1 then
V = 1 x 1 x 1 (l x b x h taken as 1)
V= l3
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If it is doubled, then V = 23
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V = 8 times
hence volume will increase by 8 times.

Question 7:
What is the principle of spring balance?
Answer:
The spring gets stretched due to the force exerted on it, this stretching produced is directly proportional to
the stretching force.

Question 8:
State two precautions while measuring the volume in the cylinder.
Answer:

1. The measuring cylinder should be placed on a plain flat surface.

2. The lower meniscus and eye line should be parallel.

Question 9:
A spring balance has a zero error of 2 divisions and there are 10 marks between 0-10 N. Find the value of
zero error.
Answer:
0-10 N has 10 divisions hence each division mark indicates 1 N. Hence, the zero error is 2 N.

Question 10:
The density of water is 1 kg/m3 at 4° C. What will happen to its density if the temperature falls?
Answer:
With the decrease in the temperature, the density of water decreases.

Question 11:
At what temperature the density of water is maximum?
Answer:
At 4°C.

Question 12:
If you are given a choice to choose a spring balance with different least count values to do the experiment.
Which one will you choose?
Answer:
I will choose the spring balance which has the minimum value of least count to get accurate readings.

Question 13:
What precautions will you take while holding the spring balance to find the weight of a body?
Answer:
The spring balance should be held only at the hook on the top end, never hold the spring balance from its
sides.
 NCERT LAB MANUAL QUESTIONS
NCERT SOLUTIONS TS GREWAL CBSE SAMPLE PAPERS NCERT EXEMPLAR PROBLEMS ENGLISH GRAMMAR MCQ QUESTIONS
Question 1:
Can you determine the density of a porous solid by using a spring balance and a measuring cylinder? Give
reasons in support of your answer.
Answer:
The density of the porous solid cannot be found by using measuring cylinder and spring balance. This is
because the mass of solid when immersed in water will increase instead of decreasing as it will absorb
water and amount of water displaced by the porous solid will be affected.

Question 2:
How the presence of an air bubble in the liquid taken in the measuring cylinder can affect the volume of the
solid?
Answer:
The air bubble in the liquid taken in the measuring cylinder for an experiment will affect the volume of the
solid because the air bubble occupies some space in the liquid and this increases the volume of the liquid.

Question 3:
Density of sealing wax is 1.8 g/cm3 . Express it in kg/m3
Answer:
Density = mass/ volume
Density of sealing wax =1.8 g/cm3
1 g/cm3= 1000 kg/m3
In kg/m3 the above density will be = 1.8 x 1000 kg/m3 = 1800 kg/m3

Question 4:
A metal cylinder is melted and the whole mass is cast in the shape of a cube. What happens to its density?
Give reasons.
Answer:
The density in both the cases will be same because the mass remains the same and the volume of the
water displaced by the metal cylinder and the cube remains the same.

Question 5:
At which temperature is the density of water maximum?
Answer:
The density of water is maximum : 4°C.

MULTIPLE CHOICE QUESTIONS (MCQs)

Questions based on Procedural and Manipulative Skills

Question 1:
To find the density ‘D’ of a body with mass ‘M’ and volume ‘V’, the correct formula is
D
(a) M = V

(b) D = M

(c) V = D

(d) D = M x V.

Question 2:
If W is the weight of the body, ‘m’ is the mass of the body and ‘g’ is the force of gravity acting on a body
then
(a) W =
m

g
g
(b) W = m x 2
(c) W = m x g
(d) W = xg.
m