# G. Science (Grade 5 - 8)

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Quizzes Created: 12 | Total Attempts: 28,844
Questions: 26 | Attempts: 695

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• 7.

### Water is heated in a kettle. The inside water is heated by convection. A person sitting near the fire receives heat by.

• A.

Conduction

• B.

Convection

• C.

• D.

Reflection

Explanation
When water is heated in a kettle, the inside water is heated by convection, which is the transfer of heat through the movement of particles. However, the person sitting near the fire receives heat by radiation. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation, which can travel through empty space and transfer heat to objects without direct contact. In this case, the person is receiving heat from the fire through the emission of infrared radiation.

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• 8.

### Specific gravity of milk is measured by an instrument known as:

• A.

Lactometer

• B.

Barometer

• C.

Hydrometer

• D.

Pedometer

A. Lactometer
Explanation
A lactometer is the instrument used to measure the specific gravity of milk. This device helps determine the purity and quality of milk by measuring its density compared to water. The lactometer works on the principle that denser substances will sink deeper into a liquid, while less dense substances will float higher. By measuring the level at which the lactometer floats in milk, the specific gravity can be determined, which is an important indicator of milk composition and potential adulteration.

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• 9.

### Light year is a unit of

• A.

Distance

• B.

Time period

• C.

Light intensity

• D.

Time

A. Distance
Explanation
A light year is a unit of distance, specifically the distance that light travels in one year. It is used to measure vast distances in space, as light can travel at a speed of approximately 300,000 kilometers per second. Therefore, the correct answer is distance.

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• 10.

### Three elements needed for the healthy growth of plants are

• A.

N, P, K

• B.

N, C, P

• C.

N, K, C

• D.

N, S, P

A. N, P, K
Explanation
The correct answer is N, P, K. N represents nitrogen, P represents phosphorus, and K represents potassium. These three elements are essential for the healthy growth of plants. Nitrogen is needed for the development of leaves and stems, phosphorus is necessary for root growth and flower formation, and potassium helps in overall plant health and disease resistance. Therefore, a combination of these three elements is crucial for the proper growth and development of plants.

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• 11.

### Copper can be converted into gold by:

• A.

Heating

• B.

• C.

Electroplating

• D.

Chemical Reaction

C. Electroplating
Explanation
Electroplating is the process of depositing a layer of metal onto a surface using an electric current. In the case of copper being converted into gold, electroplating can be used by immersing the copper object in a solution containing gold ions and using electricity to transfer the gold ions onto the copper surface. This results in a thin layer of gold being deposited onto the copper, giving it the appearance of gold. However, it is important to note that this process does not actually convert copper into gold chemically, but rather provides a gold-like appearance.

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• 12.

### The echo (reflected sound) will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least:

• A.

13 m

• B.

17 m

• C.

19 m

• D.

23 m

B. 17 m
Explanation
When sound waves encounter a reflecting surface, they bounce back and create an echo. However, for the echo to be distinctly heard, there needs to be a sufficient time gap between the original sound and the echo. This time gap is determined by the distance between the reflecting surface and the source of sound. The speed of sound is approximately 343 meters per second, so if the distance is too short, the time gap will be too small for the echo to be distinguishable. Therefore, the minimum distance required for the echo to be distinctly heard at ordinary temperatures is 17 meters.

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• 13.

### When a ray of sunlight enters a dark room, its straight path becomes visible because of dustparticles hanging in the air. It is because light is:

• A.

Visible

• B.

Transparent

• C.

Invisible

• D.

Opaque

B. Transparent
Explanation
When a ray of sunlight enters a dark room, its straight path becomes visible because of dust particles hanging in the air. This indicates that light is transparent, as it is able to pass through the air and illuminate the dust particles, making them visible to the human eye.

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• 14.

### The temperature of the dead body is:

• A.

Temperature of the place where it is kept

• B.

37

• C.

Room temperature

• D.

0

A. Temperature of the place where it is kept
Explanation
The temperature of a dead body is determined by the temperature of the place where it is kept. When a body is no longer alive, it no longer generates heat through metabolic processes. Therefore, the body will eventually reach the same temperature as its surroundings. This means that if the body is kept in a cold environment, it will become cold, and if it is kept in a warm environment, it will become warm.

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• 15.

### Cusec is a unit of:

• A.

Rate of flow

• B.

Time

• C.

Distance

• D.

Mass

A. Rate of flow
Explanation
Cusec is a unit of rate of flow. It stands for cubic feet per second and is commonly used to measure the amount of water flowing in a river or canal. It indicates the volume of water that passes through a specific point in one second. This unit is widely used in hydrology and engineering to analyze and manage water resources, as well as in irrigation and water supply systems.

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• 16.

### The deepest place on earth is:

• A.

Trench

• B.

Mariana Trench

• C.

Mangrove

• D.

Groove

B. Mariana Trench
Explanation
The Mariana Trench is the correct answer because it is the deepest place on earth. Located in the western Pacific Ocean, it reaches a depth of approximately 36,070 feet (10,994 meters). It is a crescent-shaped trench and is known for its extreme depth and unique ecosystem. The trench is formed by the subduction of the Pacific Plate beneath the Mariana Plate.

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• 17.

### There are __________ parts of small intestine

• A.

2

• B.

3

• C.

4

• D.

5

B. 3
Explanation
The small intestine is divided into three parts: the duodenum, the jejunum, and the ileum. Each of these parts has a specific role in the digestion and absorption of nutrients. The duodenum receives partially digested food from the stomach and further breaks it down with the help of digestive enzymes from the pancreas and bile from the liver. The jejunum is responsible for the majority of nutrient absorption, while the ileum absorbs remaining nutrients and plays a role in the reabsorption of bile salts. Therefore, the correct answer is 3.

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• 18.

### Bronze medal is made up of metals:

• A.

Copper, Nickel

• B.

Copper, Tin

• C.

Copper, Silver

• D.

Copper, Zinc

B. Copper, Tin
Explanation
Bronze is an alloy that is primarily made up of copper and tin. Copper provides the base metal for the alloy, while tin is added to strengthen and harden the bronze. This combination of copper and tin creates a durable and malleable material that is suitable for various applications, including the production of medals. Therefore, the correct answer is copper and tin.

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• 19.

### Which of the following, lists the four stages of food processing in order?

• A.

Ingestion, digestion, absorption, elimination

• B.

Digestion, ingestion, absorption, elimination

• C.

Ingestion, absorption, elimination, digestion

• D.

Absorption, digestion, ingestion, elimination

A. Ingestion, digestion, absorption, elimination
Explanation
The correct answer is "Ingestion, digestion, absorption, elimination". This order accurately represents the four stages of food processing. Ingestion refers to the intake of food into the body, followed by digestion, which involves the breakdown of food into smaller molecules. Absorption occurs next, where the digested nutrients are taken up by the body's cells. Finally, elimination involves the removal of undigested waste materials from the body.

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• 20.

### Cobalt is a material which is

• A.

Strongly attracted by a magnet

• B.

Not attracted by a magnet

• C.

Not a magnet

• D.

Weakly attracted by a magnet

D. Weakly attracted by a magnet
Explanation
Cobalt is a material that exhibits weak attraction to a magnet. This means that when a magnet is brought close to cobalt, it will experience a slight pull towards the magnet, but not a strong or significant one. This characteristic of cobalt can be attributed to its magnetic properties, as it is a ferromagnetic material. However, compared to other ferromagnetic materials like iron or nickel, cobalt has a weaker magnetic attraction.

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• 21.

### Hepatitis A is transmitted to different individuals by:

• A.

Water

• B.

Sneezing

• C.

Spit

• D.

Faeces

D. Faeces
Explanation
Hepatitis A is transmitted through the fecal-oral route, meaning that the virus is present in the feces of an infected person and can be spread to others if they come into contact with contaminated food, water, or objects. This can happen through inadequate hand hygiene after using the toilet or changing diapers. Therefore, the correct answer is "Faeces."

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• 22.

### The most abundant element present in the human body is:

• A.

Nitrogen

• B.

Carbon

• C.

Hydrogen

• D.

Oxygen

D. Oxygen
Explanation
Oxygen is the most abundant element present in the human body. It makes up about 65% of the total body weight. Oxygen is essential for various biological processes, including respiration and energy production. It is a key component of water and is also found in many organic molecules such as carbohydrates, proteins, and lipids. Oxygen plays a vital role in maintaining the overall health and functioning of the human body.

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• 23.

### Cancer can be treated by:

• A.

Antibiotics and vaccines

• B.

• C.

• D.

Antibodies and chemotherapy

Explanation
Chemotherapy and radiotherapy are effective treatments for cancer. Chemotherapy involves the use of drugs to kill cancer cells throughout the body, while radiotherapy uses high-energy radiation to target and destroy cancer cells in a specific area. These treatments are often used together or in combination with other therapies to maximize their effectiveness. Antibiotics and vaccines are not typically used to treat cancer, and antibodies alone are not sufficient for treating the disease. Therefore, the correct answer is chemotherapy and radiotherapy.

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• 24.

### There are ___________________ planets in our solar system.

• A.

Six

• B.

Seven

• C.

Eight

• D.

Nine

C. Eight
Explanation
There are eight planets in our solar system. This is based on the definition of a planet as a celestial body that orbits the Sun, is spherical in shape, and has cleared its orbit of other debris. The eight planets in our solar system, in order of their distance from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

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• 25.

### A time can come when we will be able to design a machine which can go on working for ever without the expenditure of energy. Is it possible?

• A.

No

• B.

Yes

• C.

In due course of time

• D.

None of the above

A. No
Explanation
It is not possible to design a machine that can go on working forever without the expenditure of energy. This goes against the fundamental laws of thermodynamics, specifically the principle of energy conservation. Energy cannot be created or destroyed, only transformed from one form to another. Therefore, any machine that operates indefinitely would require a constant input of energy, either from an external source or from some internal energy conversion process.

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• 26.

### It is possible to recognize a person in the dark by simply hearing his unique voice. It is because of the:

• A.

Pitch

• B.

Frequency

• C.

Time period

• D.

Quality

A. Pitch
Explanation
Pitch refers to the perceived frequency of a sound. Each person has a unique pitch or tone of voice, which remains consistent regardless of the lighting conditions. Therefore, even in the dark, it is possible to recognize a person by their distinct pitch or voice.

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• Mar 16, 2023
Quiz Edited by
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• Apr 13, 2014
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