Measurement of Density and Speed Class-7th Goyal Brothers Physics Solutions Chapter-1. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Study questions of Chapter-1,Physical Quantities and Measurement unit -2(Measurement of Density and Speed ) Visit official Website CISCE for detail information about ICSE Board Class-7.
Measurement of Density and Speed Class-7th Goyal Brothers
Physics Solutions Ch-1 (unit-3)
Board | ICSE |
Class | 7th |
Subject | Physics |
Book Name | Goyal Brothers |
Theme-1 | Physical Quantities and Measurement |
Unit-3 | Measurement of Density and Speed |
Topic | Solution of exercise questions |
Session | 2023-24 |
OBJECTIVE TYPE QUESTIONS
(Goyal Brothers Physics Solutions)
A. Fill in the blanks :
- The density of iron is 7.8 gcm^{-3}. The volume of 390 g of iron is _50_ cm^{3}.
- The density of _solid_ hardly changes with a rise in temperature by 20 degree celcius.
- In SI system, unit of density is _Kgm^{-3}_.
- The density of water is 1 gcm^{-3}. Therefore, 1 cm^{3} of water has a _mass_ of 1 g.
- The distance covered by a body in unit time is called _speed_.
B. Statement given below are incorrect. write the correct correct statement:
1. Force per unit area of a substance is called density.
Correct Statement: Mass per unit area of a substance is called density.
2. The mass of a solid is determined by a spring balance very accurately.
Correct Statement: The mass of a solid is determined by a beam balance very accurately.
3. In SI system, unit of speed is Kmh^{-1}.
Correct Statement: In SI system, unit of speed is ms^{-1}.
4. In case of uniform speed, one can need to find the average speed of the body.
Correct Statement: In case of non-uniform speed, one can need to find the average speed of the body.
5. With the rise in temperature of air its density increases.
Correct Statement: With the rise in temperature of air its density decreases.
B. Write ‘True’ or ‘False’ for the following statements :
- The mass per unit volume of a substance is called its density. [T]
- A specially designed bottle is used for finding density of solids. [T]
- All forms of matter expand on heating and contract on cooling. [T]
- The speed can be found by dividing the distance covered by the time. [T]
- If the distance covered are fairly large the speed is expressed in cm/s. [F]
D. Tick (√) the most appropriate answer.
1. The density of gold is 19.6 gcm^{-3} in CGS system. Its density in SI system is :
(a) 196 kgm^{-3}
(b) 1960 Kgm^{-3}
(c) 19600 kgm^{-3}
(d) no change in density
Ans: (c) 19600 kgm^{-3}
2.When a liquid is heated, it expands comparatively :
(a) more than solid
(b) less than gas
(c) less than solid
(d) either (a) or (b)
Ans: (d) either (a) or (b)
3. In order to find the density of solid we have to know its :
(a) mass and area
(b) weight and volume
(c) weight and area
(d) mass and volume
Ans: (d) mass and volume
4. When the air cools, its density :
(a) increases
(b) decreases
(c) does not change
(d) none of these
Ans: (a) increases
5. In order to find speed of a moving body, we have to know its :
(a) displacement and time
(b) distance and time
(c) mass and volume
(d) distance and direction
Ans: (b) distance and time
E. Match the statement in Column A with those in Column B:
Column A |
Column B |
1. A small glass bottle used for finding the density of a liquid. | 1. ms^{-1} |
2. Mass per unit volume. | 2. 1000 kgm^{-3} |
3. Distance per unit time. | 3. Density |
4. The unit of speed in SI system. | 4. Density bottle |
5. The density of fresh water in SI system. | 5. Speed |
Answer:
Column A | Column B |
1. A small glass bottle used for finding the density of a liquid. | 4. Density bottle |
2. Mass per unit volume. | 3. Density |
3. Distance per unit time. | 5. Speed |
4. The unit of speed in SI system. | 1. ms^{-1} |
5. The density of fresh water in SI system. | 2. 1000 kgm^{-3} |
Link for – Study and Numerical Based Questions from Que- 1 to 22.
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Study and Numerical Based Questions from Que- 1 to 22.
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