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All questions of Science & Technology for Class 5 Exam
How many oceans are there on Earth?
- a)3
- b)5
- c)4
- d)6
Correct answer is option 'B'. Can you explain this answer?
How many oceans are there on Earth?
a)
3
b)
5
c)
4
d)
6
|
Edu Impact answered |
There are four oceans on Earth: Pacific, Atlantic, Indian, and Arctic.
Which of the following is the best example of gravitation or gravity?- a)A car hits a tree and motion stops
- b)A breeze blows and a sailboat moves
- c)A person drops a ball and it falls to the ground
- d)A book is pushed and it moves across the table
Correct answer is option 'C'. Can you explain this answer?
a)
A car hits a tree and motion stops
b)
A breeze blows and a sailboat moves
c)
A person drops a ball and it falls to the ground
d)
A book is pushed and it moves across the table
|
Rahul Kumar answered |
Gravity is the force that pulls objects towards each other, as seen when a ball is dropped and falls to the ground due to the Earth's gravitational pull.
Which tool would you use to measure volume?- a)Compass
- b)Weighing balance
- c)Graduated cylinder
- d)Ruler
Correct answer is option 'C'. Can you explain this answer?
a)
Compass
b)
Weighing balance
c)
Graduated cylinder
d)
Ruler
|
Manoj Desai answered |
Measuring Volume using a Graduated Cylinder
Measuring volume involves determining the amount of space occupied by a substance. A graduated cylinder is a tool specifically designed for measuring volume accurately. Here's why it is the appropriate tool for this task:
Graduated Cylinder
- A graduated cylinder is a tall, narrow container with volume markings along its length.
- These markings allow for precise measurement of liquid volume.
- The cylinder's narrow shape helps to reduce errors in reading the volume.
How to Measure Volume with a Graduated Cylinder
- Pour the liquid into the graduated cylinder and place it on a flat surface.
- Read the volume at the bottom of the meniscus (the curved surface of the liquid).
- Ensure your eye level is at the same level as the liquid to avoid parallax errors.
- Take note of the volume reading at the point where the bottom of the meniscus touches the graduated cylinder.
Importance of Using a Graduated Cylinder
- Graduated cylinders provide accurate and precise measurements of volume.
- They are commonly used in science labs for experiments that require precise volume measurements.
- Using a graduated cylinder helps in ensuring the reliability of experimental results.
In conclusion, a graduated cylinder is the ideal tool for measuring volume due to its accuracy, precision, and ease of use. By following the correct procedure, accurate volume measurements can be obtained for various substances.
Measuring volume involves determining the amount of space occupied by a substance. A graduated cylinder is a tool specifically designed for measuring volume accurately. Here's why it is the appropriate tool for this task:
Graduated Cylinder
- A graduated cylinder is a tall, narrow container with volume markings along its length.
- These markings allow for precise measurement of liquid volume.
- The cylinder's narrow shape helps to reduce errors in reading the volume.
How to Measure Volume with a Graduated Cylinder
- Pour the liquid into the graduated cylinder and place it on a flat surface.
- Read the volume at the bottom of the meniscus (the curved surface of the liquid).
- Ensure your eye level is at the same level as the liquid to avoid parallax errors.
- Take note of the volume reading at the point where the bottom of the meniscus touches the graduated cylinder.
Importance of Using a Graduated Cylinder
- Graduated cylinders provide accurate and precise measurements of volume.
- They are commonly used in science labs for experiments that require precise volume measurements.
- Using a graduated cylinder helps in ensuring the reliability of experimental results.
In conclusion, a graduated cylinder is the ideal tool for measuring volume due to its accuracy, precision, and ease of use. By following the correct procedure, accurate volume measurements can be obtained for various substances.
Which of the following materials can be separated using filtration?- a)A solution of salt and water
- b)A solution of vinegar and water
- c)A mixture of mud and water
- d)A mixture of sand and sawdust
Correct answer is option 'D'. Can you explain this answer?
a)
A solution of salt and water
b)
A solution of vinegar and water
c)
A mixture of mud and water
d)
A mixture of sand and sawdust
|
Kavya Chauhan answered |
Separating Sand and Sawdust using Filtration
Separating sand and sawdust can be achieved using the process of filtration. Here's how it can be done:
- Setup Filtration Apparatus: Firstly, set up a filtration apparatus consisting of a funnel, filter paper, and a beaker. Place the funnel with filter paper in the mouth of the beaker.
- Prepare Mixture: Mix the sand and sawdust together to create a homogeneous mixture.
- Add Mixture: Pour the mixture of sand and sawdust into the funnel with filter paper. The filter paper will allow the liquid (water) to pass through while trapping the solid particles (sand) and sawdust.
- Separation: As the water passes through the filter paper, the sand particles will be retained on the filter paper, while the water containing the sawdust will pass through into the beaker.
- Collecting Components: Once the filtration is complete, carefully remove the filter paper with the sand particles and allow it to dry. The sawdust-water mixture collected in the beaker can be further separated by methods such as evaporation.
Therefore, sand and sawdust can be effectively separated using filtration, making it a suitable method for this particular mixture.
Separating sand and sawdust can be achieved using the process of filtration. Here's how it can be done:
- Setup Filtration Apparatus: Firstly, set up a filtration apparatus consisting of a funnel, filter paper, and a beaker. Place the funnel with filter paper in the mouth of the beaker.
- Prepare Mixture: Mix the sand and sawdust together to create a homogeneous mixture.
- Add Mixture: Pour the mixture of sand and sawdust into the funnel with filter paper. The filter paper will allow the liquid (water) to pass through while trapping the solid particles (sand) and sawdust.
- Separation: As the water passes through the filter paper, the sand particles will be retained on the filter paper, while the water containing the sawdust will pass through into the beaker.
- Collecting Components: Once the filtration is complete, carefully remove the filter paper with the sand particles and allow it to dry. The sawdust-water mixture collected in the beaker can be further separated by methods such as evaporation.
Therefore, sand and sawdust can be effectively separated using filtration, making it a suitable method for this particular mixture.
How do scientists explain the presence of sea fossils in high mountain areas?- a)A new climate caused an ocean to disappear.
- b)The mountains were lifted from low, wet areas.
- c)The fossils were carried there by flowing rivers.
- d)The samples were left behind from volcanic eruptions.
Correct answer is option 'B'. Can you explain this answer?
a)
A new climate caused an ocean to disappear.
b)
The mountains were lifted from low, wet areas.
c)
The fossils were carried there by flowing rivers.
d)
The samples were left behind from volcanic eruptions.
|
|
Yashvi Pillai answered |
Understanding Sea Fossils in High Mountains
The presence of sea fossils in high mountain areas can be explained by geological processes that have occurred over millions of years. Let's delve into why option 'B' is the correct answer.
Mountain Formation
- Mountains are formed primarily through tectonic activity. This process involves the movement of Earth's plates.
- When these plates collide, the land can be pushed upwards, resulting in the formation of mountains.
Ancient Sea Beds
- Many mountains were once part of the ocean floor, where marine life thrived.
- Over time, these ocean floors were uplifted due to tectonic forces, bringing sea fossils along with them.
Fossil Evidence
- Fossils found in these high-altitude regions are remnants of organisms that lived in ancient seas.
- The types of fossils found (like shells or coral) provide evidence that these areas were submerged underwater millions of years ago.
Geological Time Scale
- The process of uplift is a slow one, often taking millions of years, which aligns with the geological time scale.
- As mountains rise, they can retain the history of the Earth's past environments, including ancient seas.
Conclusion
- Thus, the correct explanation for the presence of sea fossils in high mountain regions is that these mountains were lifted from low, wet areas where oceans once existed, confirming option 'B' as accurate.
Understanding these processes helps us appreciate the dynamic nature of Earth’s geology and its history.
The presence of sea fossils in high mountain areas can be explained by geological processes that have occurred over millions of years. Let's delve into why option 'B' is the correct answer.
Mountain Formation
- Mountains are formed primarily through tectonic activity. This process involves the movement of Earth's plates.
- When these plates collide, the land can be pushed upwards, resulting in the formation of mountains.
Ancient Sea Beds
- Many mountains were once part of the ocean floor, where marine life thrived.
- Over time, these ocean floors were uplifted due to tectonic forces, bringing sea fossils along with them.
Fossil Evidence
- Fossils found in these high-altitude regions are remnants of organisms that lived in ancient seas.
- The types of fossils found (like shells or coral) provide evidence that these areas were submerged underwater millions of years ago.
Geological Time Scale
- The process of uplift is a slow one, often taking millions of years, which aligns with the geological time scale.
- As mountains rise, they can retain the history of the Earth's past environments, including ancient seas.
Conclusion
- Thus, the correct explanation for the presence of sea fossils in high mountain regions is that these mountains were lifted from low, wet areas where oceans once existed, confirming option 'B' as accurate.
Understanding these processes helps us appreciate the dynamic nature of Earth’s geology and its history.
Which of the following is not a satellite of Earth?- a)GSAT-7
- b)International Space Station (ISS)
- c)Moon
- d)Phobos
Correct answer is option 'D'. Can you explain this answer?
a)
GSAT-7
b)
International Space Station (ISS)
c)
Moon
d)
Phobos
|
Sankar Khanna answered |
Explanation:
Earth Satellites:
- Satellites are objects that orbit around a larger body. Earth has several natural and artificial satellites.
- The natural satellite of Earth is the Moon.
- Artificial satellites are man-made objects that orbit the Earth for various purposes such as communication, weather monitoring, and navigation.
Options:
- GSAT-7: GSAT-7 is an Indian communication satellite that orbits the Earth.
- International Space Station (ISS): The ISS is a space station in low Earth orbit where astronauts from various countries live and work.
- Moon: The Moon is Earth's natural satellite that orbits around our planet.
- Phobos: Phobos is a natural satellite of Mars, not Earth. It is one of the two moons of Mars, the other being Deimos.
Therefore, the correct answer is option D) Phobos as it is not a satellite of Earth but rather a satellite of Mars.
Earth Satellites:
- Satellites are objects that orbit around a larger body. Earth has several natural and artificial satellites.
- The natural satellite of Earth is the Moon.
- Artificial satellites are man-made objects that orbit the Earth for various purposes such as communication, weather monitoring, and navigation.
Options:
- GSAT-7: GSAT-7 is an Indian communication satellite that orbits the Earth.
- International Space Station (ISS): The ISS is a space station in low Earth orbit where astronauts from various countries live and work.
- Moon: The Moon is Earth's natural satellite that orbits around our planet.
- Phobos: Phobos is a natural satellite of Mars, not Earth. It is one of the two moons of Mars, the other being Deimos.
Therefore, the correct answer is option D) Phobos as it is not a satellite of Earth but rather a satellite of Mars.
What compact power unit converts chemical energy into electrical energy?- a)Cell
- b)Dynamo
- c)Engine
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
a)
Cell
b)
Dynamo
c)
Engine
d)
None of these
|
Surbhi Shah answered |
Cell
Cells are compact power units that convert chemical energy into electrical energy. They are commonly used in various devices such as flashlights, remote controls, and electronic gadgets.
How Cells Work
- Cells contain chemicals that undergo chemical reactions to produce electrical energy.
- These reactions generate a flow of electrons, creating an electrical current.
- The electrical current can then be used to power the device connected to the cell.
Types of Cells
- There are different types of cells, such as alkaline cells, lithium cells, and rechargeable cells.
- Each type has its own chemical composition and characteristics, which determine its performance and lifespan.
Advantages of Cells
- Cells are lightweight and portable, making them convenient for use in various applications.
- They provide a reliable source of electrical energy without the need for external power sources.
Applications of Cells
- Cells are commonly used in devices that require portable power sources, such as smartphones, laptops, and cameras.
- They are also used in emergency backup systems, medical devices, and renewable energy systems.
In conclusion, cells are compact power units that efficiently convert chemical energy into electrical energy. They play a crucial role in powering various electronic devices and are essential in our daily lives.
Cells are compact power units that convert chemical energy into electrical energy. They are commonly used in various devices such as flashlights, remote controls, and electronic gadgets.
How Cells Work
- Cells contain chemicals that undergo chemical reactions to produce electrical energy.
- These reactions generate a flow of electrons, creating an electrical current.
- The electrical current can then be used to power the device connected to the cell.
Types of Cells
- There are different types of cells, such as alkaline cells, lithium cells, and rechargeable cells.
- Each type has its own chemical composition and characteristics, which determine its performance and lifespan.
Advantages of Cells
- Cells are lightweight and portable, making them convenient for use in various applications.
- They provide a reliable source of electrical energy without the need for external power sources.
Applications of Cells
- Cells are commonly used in devices that require portable power sources, such as smartphones, laptops, and cameras.
- They are also used in emergency backup systems, medical devices, and renewable energy systems.
In conclusion, cells are compact power units that efficiently convert chemical energy into electrical energy. They play a crucial role in powering various electronic devices and are essential in our daily lives.
Which of the following is the SI unit of electric current?- a)Volt
- b)Ampere
- c)Ohm
- d)Watt
Correct answer is option 'B'. Can you explain this answer?
a)
Volt
b)
Ampere
c)
Ohm
d)
Watt
|
Aryan Joshi answered |
Understanding Electric Current
Electric current is a fundamental concept in physics and electrical engineering, representing the flow of electric charge in a circuit.
What is Electric Current?
- Electric current refers to the movement of electric charges, typically electrons, through a conductor.
- It is a measure of how much electric charge passes a point in a circuit per unit time.
SI Unit of Electric Current
- The SI unit of electric current is the Ampere (A).
- One Ampere is defined as the flow of one coulomb of charge per second.
Other Units Explained
- Volt (V): The unit of electric potential or voltage. It measures the potential energy per unit charge.
- Ohm (Ω): The unit of electrical resistance. It quantifies how much a material resists the flow of electric current.
- Watt (W): The unit of power, which measures the rate of energy transfer. One Watt is equal to one Joule per second.
Importance of the Ampere
- The Ampere is crucial for understanding electrical systems and circuits.
- It helps engineers and scientists calculate the amount of current flowing through wires and devices, ensuring safety and functionality.
Conclusion
In summary, while Volt, Ohm, and Watt are essential concepts in electricity, the correct answer to the question about the SI unit of electric current is option 'B', Ampere. Understanding these units is vital for anyone studying electricity and its applications.
Electric current is a fundamental concept in physics and electrical engineering, representing the flow of electric charge in a circuit.
What is Electric Current?
- Electric current refers to the movement of electric charges, typically electrons, through a conductor.
- It is a measure of how much electric charge passes a point in a circuit per unit time.
SI Unit of Electric Current
- The SI unit of electric current is the Ampere (A).
- One Ampere is defined as the flow of one coulomb of charge per second.
Other Units Explained
- Volt (V): The unit of electric potential or voltage. It measures the potential energy per unit charge.
- Ohm (Ω): The unit of electrical resistance. It quantifies how much a material resists the flow of electric current.
- Watt (W): The unit of power, which measures the rate of energy transfer. One Watt is equal to one Joule per second.
Importance of the Ampere
- The Ampere is crucial for understanding electrical systems and circuits.
- It helps engineers and scientists calculate the amount of current flowing through wires and devices, ensuring safety and functionality.
Conclusion
In summary, while Volt, Ohm, and Watt are essential concepts in electricity, the correct answer to the question about the SI unit of electric current is option 'B', Ampere. Understanding these units is vital for anyone studying electricity and its applications.
When light rays bend as they move from one medium to another, what is this phenomenon called?- a)Radiation
- b)Convection
- c)Insulation
- d)Refraction
Correct answer is option 'D'. Can you explain this answer?
a)
Radiation
b)
Convection
c)
Insulation
d)
Refraction
|
|
Edu Impact answered |
Refraction is the bending of light rays as they pass from one medium to another due to a change in speed.
Which of the following is not required for the formation of a shadow?- a)Source of light
- b)Screen
- c)Opaque object
- d)Lens
Correct answer is option 'D'. Can you explain this answer?
a)
Source of light
b)
Screen
c)
Opaque object
d)
Lens
|
|
Rahul Kumar answered |
A lens is not necessary for the formation of a shadow. Shadows are formed when an opaque object blocks light from a source, creating a dark region on a screen.
What is the blanket-like layer that surrounds the Earth, containing gases like oxygen and protecting it from the sun's harmful radiations called?- a)Hydrosphere
- b)Geosphere
- c)Atmosphere
- d)Lithosphere
Correct answer is option 'C'. Can you explain this answer?
a)
Hydrosphere
b)
Geosphere
c)
Atmosphere
d)
Lithosphere
|
|
Edu Impact answered |
The atmosphere is the layer of gases surrounding the Earth, including oxygen and protecting it from harmful solar radiation.
What is the process of a liquid changing into a gas at the surface of the liquid called?- a)Evaporation
- b)Condensation
- c)Sublimation
- d)Vaporization
Correct answer is option 'A'. Can you explain this answer?
a)
Evaporation
b)
Condensation
c)
Sublimation
d)
Vaporization
|
|
Rahul Kumar answered |
Evaporation is the process of a liquid changing into a gas at the surface of the liquid, usually due to heating.
Which of the following will not be attracted by a magnet?- a)Fridge door
- b)Sheet of paper
- c)Iron nail
- d)Steel plate
Correct answer is option 'B'. Can you explain this answer?
a)
Fridge door
b)
Sheet of paper
c)
Iron nail
d)
Steel plate
|
|
Edu Impact answered |
Paper is not attracted to magnets because it is not a ferromagnetic material like iron or steel.
What is the term for the reflection of sound that arrives at the listener with a delay after the direct sound?- a)Echo
- b)Mirage
- c)Decibel
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
a)
Echo
b)
Mirage
c)
Decibel
d)
None of these
|
|
Rahul Kumar answered |
An echo is the reflection of sound that arrives at the listener with a delay after the direct sound, commonly observed in mountainous areas.
Which of the following is a conductor of electricity?- a)Cloth
- b)Paper
- c)Wood
- d)Iron
Correct answer is option 'D'. Can you explain this answer?
a)
Cloth
b)
Paper
c)
Wood
d)
Iron
|
|
Edu Impact answered |
Iron is a metal and is a good conductor of electricity compared to non-metallic materials like cloth, paper, and wood.
What type of memory stores all the data of an application currently running on a computer and is volatile in nature?- a)Hard disk
- b)ROM
- c)RAM
- d)Flash drive
Correct answer is option 'C'. Can you explain this answer?
a)
Hard disk
b)
ROM
c)
RAM
d)
Flash drive
|
|
Edu Impact answered |
RAM (Random Access Memory) is a volatile memory that stores data temporarily while a computer is running, including data from applications like MS-Word.
Which lines connect places with equal atmospheric pressure?- a)Isobars
- b)Isobath
- c)Isohaline
- d)Isohels
Correct answer is option 'A'. Can you explain this answer?
a)
Isobars
b)
Isobath
c)
Isohaline
d)
Isohels
|
|
Rahul Kumar answered |
Isobars are lines on a map connecting places with equal atmospheric pressure.
Which of the following is a physical change?- a)Burning of paper
- b)Bursting of crackers
- c)Cooking of food
- d)Melting of ice
Correct answer is option 'D'. Can you explain this answer?
a)
Burning of paper
b)
Bursting of crackers
c)
Cooking of food
d)
Melting of ice
|
|
Rahul Kumar answered |
Melting of ice is a physical change as it involves a change in state from solid to liquid without altering the chemical composition of the substance.
What is the SI unit of force?- a)Newton
- b)Joule
- c)Watt
- d)Pascal
Correct answer is option 'A'. Can you explain this answer?
a)
Newton
b)
Joule
c)
Watt
d)
Pascal
|
|
Rahul Kumar answered |
Newton is the SI unit of force, named after Sir Isaac Newton.
Which of these is an element?- a)Carbon dioxide
- b)Air
- c)Hydrogen
- d)Water
Correct answer is option 'C'. Can you explain this answer?
a)
Carbon dioxide
b)
Air
c)
Hydrogen
d)
Water
|
|
Rahul Kumar answered |
Hydrogen is an element because it consists of only one type of atom and cannot be broken down into simpler substances by chemical means.
What does CPU stand for?- a)Central Processing Unit
- b)Control Processing Unit
- c)Command Processing Unit
- d)Communications Procedures Unit
Correct answer is option 'A'. Can you explain this answer?
a)
Central Processing Unit
b)
Control Processing Unit
c)
Command Processing Unit
d)
Communications Procedures Unit
|
|
Rahul Kumar answered |
CPU stands for Central Processing Unit, which is the primary component of a computer responsible for executing instructions.
Which of the following is a greenhouse gas?- a)Oxygen
- b)Nitrogen
- c)Carbon dioxide
- d)Argon
Correct answer is option 'C'. Can you explain this answer?
a)
Oxygen
b)
Nitrogen
c)
Carbon dioxide
d)
Argon
|
|
Edu Impact answered |
Carbon dioxide is a greenhouse gas that contributes to the greenhouse effect, trapping heat in the Earth's atmosphere.
Which planet is the largest of the inner planets, covered mostly with water, and appears bluish from space?- a)Mercury
- b)Venus
- c)Earth
- d)Mars
Correct answer is option 'C'. Can you explain this answer?
a)
Mercury
b)
Venus
c)
Earth
d)
Mars
|
|
Rahul Kumar answered |
Earth is the largest of the inner planets, covered mostly with water, and appears bluish from space due to its oceans.
Which of the following is a simple machine consisting of a grooved wheel wrapped around a central cylinder?- a)Lever
- b)Inclined plane
- c)Wedge
- d)Screw
Correct answer is option 'D'. Can you explain this answer?
a)
Lever
b)
Inclined plane
c)
Wedge
d)
Screw
|
|
Edu Impact answered |
A screw is a simple machine that consists of a grooved wheel wrapped around a central cylinder, allowing it to be turned to apply force.
Which fact about asteroids is correct?- a)Asteroids do not revolve around the Sun the way planets do.
- b)The asteroid belt is between Venus and Jupiter.
- c)Asteroids are planet-like objects, but smaller and often irregularly shaped.
- d)Asteroids cannot be classified into groups.
Correct answer is option 'C'. Can you explain this answer?
a)
Asteroids do not revolve around the Sun the way planets do.
b)
The asteroid belt is between Venus and Jupiter.
c)
Asteroids are planet-like objects, but smaller and often irregularly shaped.
d)
Asteroids cannot be classified into groups.
|
|
Edu Impact answered |
Asteroids are rocky objects that revolve around the Sun, primarily located in the asteroid belt between Mars and Jupiter. They are smaller than planets and often have irregular shapes.
Which instrument is used to see objects that are too small for the unaided eye?- a)Spectacles
- b)Microscope
- c)Contact lens
- d)Telescope
Correct answer is option 'B'. Can you explain this answer?
a)
Spectacles
b)
Microscope
c)
Contact lens
d)
Telescope
|
|
Edu Impact answered |
A microscope is used to magnify and observe objects that are too small to be seen with the unaided eye.
What type of mirror can form a virtual, upright, and magnified image of an object placed between the focal point and the mirror?- a)Convex mirror
- b)Concave mirror
- c)Plane mirror
- d)Spherical mirror
Correct answer is option 'B'. Can you explain this answer?
a)
Convex mirror
b)
Concave mirror
c)
Plane mirror
d)
Spherical mirror
|
|
Edu Impact answered |
A concave mirror can form a virtual, upright, and magnified image of an object when placed between the focal point and the mirror.
How do ocean currents transfer heat in the ocean?- a)By convection
- b)By radiation
- c)By conduction
- d)By evaporation
Correct answer is option 'A'. Can you explain this answer?
a)
By convection
b)
By radiation
c)
By conduction
d)
By evaporation
|
|
Edu Impact answered |
Ocean currents transfer heat through the process of convection, where warmer water moves towards cooler regions, and cooler water moves towards warmer regions, redistributing heat.
Which instrument is used in submarines to observe activity above the water surface while submerged?- a)Binoculars
- b)Telescope
- c)Periscope
- d)Kaleidoscope
Correct answer is option 'C'. Can you explain this answer?
a)
Binoculars
b)
Telescope
c)
Periscope
d)
Kaleidoscope
|
|
Edu Impact answered |
A periscope is an optical instrument used in submarines to observe objects above the water surface while the submarine remains submerged.
Which of the following is a property of metals?- a)Bendable
- b)Shiny
- c)Conducts heat
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
a)
Bendable
b)
Shiny
c)
Conducts heat
d)
All of these
|
|
Rahul Kumar answered |
Metals generally have properties like being bendable, shiny, and good conductors of heat.
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