Welcome to Class 5 EVS chapter 7 question answer. On this page find important extra questions for this NCERT book for Class 5 EVS Chapter 7 Experiments with Water class 5 evs worksheet with answers.
Class 5th EVS chapter 7 question answer (NCERT Book)
The questions found on the Experiments with Water class 5 evs worksheet with answers class 5 EVS worksheet with answers have been prepared in a manner that is consistent with the NCERT book. Getting more practice with these questions will help you achieve better grades in school.
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Experiments with Water class 5 EVS chapter 7 question answer
Match the following
COLUMN 2 | |
---|---|
1. What floats – what sinks | a. Iron nail |
2. A puri in a bowl of water | b. Aluminium foil |
3. Steel plate on water | c. Soap case |
4. Cap of a plastic bottle | d. Salt |
5. Dissolving sugar quickly | e. Lemon in salty water |
Answer
- e)
- b)
- a)
- c)
- d)
Choose the right option:
- The iron nail sinks in water but the katori floats. I think this happened because of the difference in _________( Density/sink).
- The empty plastic bottle floats on water. The bottle filled with water sinks because of the ________ ( Increased weight/density)of the water.
- The aluminium foil floats when it is spread out. When pressed tightly into a ball, it sinks. This may have happened because of the change in ________.( Surface area/shape)
- The lemon floated in salty water because the ________ (Density/speed)of the water changed due to the salt.
- After keeping for some time, the water with salt and the water with chalk powder showed a difference in ________.( Transparency/clarity)
Answer
- Density
- Increased weight
- Surface area
- Density
- Transparency
Unscramble the words
- GARLBERE
- WODAC
- WESA
- PPRUP
- HOAPALAT
Answer
- GARBLER
- DOWAC
- SEWA
- PUPRP
- AAPOTHAL
Multiple Choice Questions
Question 1. Which of the following objects will sink in water?
a) Puffed puri
b) Steel plate
c) Soap case with soap
d) Plastic bottle cap
Question 2. What would happen if you put a puffed puri in a bowl of water?
a) It will float
b) It will sink
c) It will dissolve
d) It will change color
Question 3. What happens when you spread out aluminum foil and put it in water?
a) It sinks
b) It floats
c) It dissolves
d) It changes shape
Question 4. In the experiment with water and lemon, what enables the lemon to float?
a) Lemon’s shape
b) Lemon’s weight
c) Salt in the water
d) Lemon’s color
Question 5. Which of the following substances will dissolve in water?
a) Iron nail
b) Soil
c) Chalk powder
d) Oil
Answer
- b)
- b)
- b)
- c)
- c)
Answer the following questions
Question 1. What factors determine whether an object will float or sink in water?
Answer: The factors that determine whether an object will float or sink in water are its density and the density of the water. If the object is denser than the water, it will sink, and if it is less dense, it will float.
Question 2. Why did the puri float in the hot oil while one puri did not puff up and sank?
Answer: The puri floats in the hot oil because the heat causes the dough to puff up, creating air pockets inside. These air pockets make the puri less dense than the oil, allowing it to float. The puri that did not puff up remained denser and sank.
Question 3. What is the difference between the behavior of a wooden boat and a needle in water?
Answer: A wooden boat floats in water because its shape and structure displace enough water to make it less dense than the water. On the other hand, a needle sinks in water due to its small size and high density.
Question 4. Why does a soap case float even when there is soap in it?
Answer: The soap case floats because its shape and material displace enough water to make it less dense than the water. Adding soap to the case does not significantly change its density, so it continues to float.
Question 5. Why do some things dissolve in water while others do not?
Answer: The ability of a substance to dissolve in water depends on its chemical properties. Substances that are soluble in water have molecules that can mix and bond with water molecules. Insoluble substances do not have the necessary chemical properties to form bonds with water molecules, so they do not dissolve.
Question 6. Why does salt dissolve in water?
Answer: Salt dissolves in water because its molecules (sodium chloride) have ionic bonds that break apart in the presence of water. The positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-) become surrounded by water molecules, allowing the salt to dissolve.
Question 7. How does the concentration of salt affect the floating of objects in water?
Answer: Increasing the concentration of salt in water increases its density. As a result, objects that would normally float in freshwater may sink in saltwater due to the increased density.
Question 8. Why do some drops of liquid slide faster than others on an inclined surface?
Answer: The sliding speed of drops on an inclined surface depends on their viscosity. Liquids with lower viscosity flow more easily and slide faster, while those with higher viscosity flow more slowly and slide more slowly.
Question 9. What happens to water when it evaporates?
Answer: When water evaporates, it changes from its liquid state to a gaseous state. The water molecules gain enough energy from the surroundings to break the intermolecular bonds and escape into the air as water vapor.
Question 10. Why did people participate in the Dandi March to protest against the salt law?
Answer: People participated in the Dandi March to protest against the salt law imposed by the British colonial government. The law restricted the production and sale of salt, causing hardship and economic exploitation. The march aimed to challenge this unjust law and assert the people’s right to make and use salt freely.
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