The Science Of Happiness

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| By Niyati Srivastav
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Niyati Srivastav
Community Contributor
Quizzes Created: 1 | Total Attempts: 67
Questions: 15 | Attempts: 67

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The Science Of Happiness - Quiz

THIS FUN QUIZ IS CONDUCTED BY NIYATI, BUSHRA AND NISHA. THIS AN INITIATIVE TO MAKE ALL STUDENTS LEARN PREVIOUS TOPICS WHICH ARE COVERED IN ONLINE CLASSES.


Questions and Answers
  • 1. 

    What is represented by the graph give below ?

    • A.

      Constant velocity

    • B.

      Uniform motion 

    • C.

      Body is at rest 

    • D.

      Non-uniform motion

    Correct Answer
    C. Body is at rest 
    Explanation
    The graph represents a horizontal line at a constant height, indicating that there is no change in position over time. This means that the body is not moving and is at rest.

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  • 2. 

    Acceleration is a vector quantity which indicates that its value is 

    • A.

      Always positive

    • B.

      Always negative 

    • C.

      Zero

    • D.

      Positive, negative or zero

    Correct Answer
    D. Positive, negative or zero
    Explanation
    Acceleration is a vector quantity because it has both magnitude and direction. The value of acceleration can be positive, negative, or zero depending on the direction and magnitude of the change in velocity. If an object is speeding up, the acceleration is positive. If it is slowing down, the acceleration is negative. And if there is no change in velocity, the acceleration is zero. Therefore, acceleration can have any of these three values depending on the situation.

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  • 3. 

    Rate of change of displacement is a 

    • A.

      Scalar quantity

    • B.

      Vector Quantity 

    • C.

      Both A & B

    • D.

      None of these

    Correct Answer
    B. Vector Quantity 
    Explanation
    The rate of change of displacement is a vector quantity because it has both magnitude and direction. Displacement is a vector quantity itself, and when we calculate its rate of change, we consider both the change in magnitude (distance) and the change in direction. Therefore, the rate of change of displacement is also a vector quantity.

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  • 4. 

    In which of the following cases of motion, the distance moved and magnitude of displacement are equal ? (i) If car is moving on straight road. (ii) If the car is moving on circular path. (iii) If the pendulum moves to and fro. (iv) The earth is moving around the sun.   

    • A.

      Only (i)

    • B.

      (i) and (iii)

    • C.

      (ii) and (iv)

    • D.

      Only (ii)

    Correct Answer
    A. Only (i)
    Explanation
    In case (i), when the car is moving on a straight road, the distance moved and the magnitude of displacement are equal because the car moves in a straight line without changing direction. The distance is the actual path covered by the car, while the displacement is the shortest distance between the initial and final positions. Since the car is moving in a straight line, the distance and displacement are the same.

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  • 5. 

    Tell whether the statement is true or false. STATEMENT- Distance and velocity both are vector quantity.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Distance is a scalar quantity, not a vector quantity. Scalar quantities have only magnitude and no direction, while vector quantities have both magnitude and direction. Velocity, on the other hand, is a vector quantity as it involves both the magnitude (speed) and the direction of an object's motion. Therefore, the statement that distance and velocity are both vector quantities is false.

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  • 6. 

    The undefined nuclear region of prokaryotes is also known as

    • A.

      Nucleus 

    • B.

      Nucleic Acid  

    • C.

      Nucleolus 

    • D.

      Nucleoid

    Correct Answer
    D. Nucleoid
    Explanation
    The undefined nuclear region of prokaryotes is called the nucleoid. Unlike eukaryotes, prokaryotes do not have a true nucleus, but instead have a region within the cytoplasm where the genetic material is located. This region is known as the nucleoid, and it contains the DNA of the prokaryotic cell. The nucleoid is not surrounded by a membrane, and it is not as organized as the nucleus found in eukaryotic cells.

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  • 7. 

    Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell ?

    • A.

      Smooth Endoplasmic Reticulum 

    • B.

      Golgi Apparatus

    • C.

      Rough Endoplasmic Reticulum

    • D.

      Lysosomes

    Correct Answer
    A. Smooth Endoplasmic Reticulum 
    Explanation
    The smooth endoplasmic reticulum plays a crucial role in detoxifying many poisons and drugs in a cell. It contains enzymes that are responsible for breaking down and neutralizing toxic substances. This organelle is involved in the metabolism of drugs and toxins, converting them into less harmful substances that can be easily eliminated from the cell. The smooth endoplasmic reticulum is also involved in the synthesis of lipids and steroids.

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  • 8. 

    Organelle other than Nucleus containing DNA

    • A.

      Plastids 

    • B.

      Golgi Apparatus 

    • C.

      Lysosomes 

    • D.

      Endoplasmic Reticulum

    Correct Answer
    A. Plastids 
    Explanation
    Plastids are organelles found in plant cells that contain their own DNA. They are responsible for various functions such as photosynthesis, storage of pigments, and synthesis of lipids. Plastids have their own genetic material, which allows them to carry out specific functions independently of the nucleus. This is why plastids are the correct answer for the organelle other than the nucleus that contains DNA.

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  • 9. 

    The only cell organelle seen in Prokaryotic cells is 

    • A.

      Ribosomes

    • B.

      Plastids

    • C.

      Lysosomes

    • D.

      Mitochondria

    Correct Answer
    A. Ribosomes
    Explanation
    Prokaryotic cells lack membrane-bound organelles, except for ribosomes. Ribosomes are responsible for protein synthesis in all cells, including prokaryotes. They are small, spherical structures found in the cytoplasm of prokaryotic cells. Ribosomes are essential for the translation of genetic information from DNA to RNA and the subsequent production of proteins. Therefore, ribosomes are the only cell organelle present in prokaryotic cells.

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  • 10. 

    The proteins and lipids, essential for building the cell membrane are manufactured by 

    • A.

      Golgi Apparatus

    • B.

      Mitochondria

    • C.

      Endoplasmic Reticulum

    • D.

      Vacuoles

    Correct Answer
    C. Endoplasmic Reticulum
    Explanation
    The endoplasmic reticulum is responsible for manufacturing proteins and lipids that are essential for building the cell membrane. It is a network of tubules and sacs located in the cytoplasm of eukaryotic cells. The rough endoplasmic reticulum has ribosomes attached to its surface, which synthesize proteins. The smooth endoplasmic reticulum is involved in lipid synthesis. Together, these two regions of the endoplasmic reticulum play a crucial role in producing the necessary components for the cell membrane.

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  • 11. 

    What do you call the process of mixing of particles of 2 types ?

    • A.

      Osmosis

    • B.

      Electrolysis

    • C.

      Collision

    • D.

      Diffusion

    Correct Answer
    D. Diffusion
    Explanation
    Diffusion refers to the process of mixing particles of two types. It occurs when particles move from an area of high concentration to an area of low concentration, resulting in a uniform distribution. This process is driven by the random motion of particles and does not require any external force. Osmosis, on the other hand, specifically refers to the movement of water molecules across a semi-permeable membrane. Electrolysis is a chemical reaction caused by the passage of an electric current through a substance. Collision refers to the physical impact between two objects.

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  • 12. 

    The amount of heat energy required to change 1 kg of liquid into gas at its boiling point

    • A.

      Latent heat of fusion

    • B.

      Latent heat of diffusion

    • C.

      Latent heat of sublimation 

    • D.

      Latent heat of vapourisation 

    Correct Answer
    D. Latent heat of vapourisation 
    Explanation
    The correct answer is latent heat of vaporization. This is because when a substance changes from a liquid to a gas at its boiling point, it requires a certain amount of heat energy. This energy is known as latent heat of vaporization. It is the amount of heat energy required to overcome the intermolecular forces holding the liquid molecules together and convert them into a gaseous state.

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  • 13. 

    What is dry ice ?

    • A.

      Solid petroleum gas

    • B.

      Liquid carbon dioxide

    • C.

      Liquified petroleum gas

    • D.

      Solid carbon dioxide

    Correct Answer
    D. Solid carbon dioxide
    Explanation
    Dry ice is the solid form of carbon dioxide. It is called "dry" ice because it does not melt into a liquid, but instead sublimates directly from a solid to a gas. This means that when dry ice is exposed to room temperature, it undergoes a phase change and turns directly into carbon dioxide gas without becoming a liquid. Dry ice is commonly used for cooling purposes, such as in transporting perishable goods or creating special effects in the entertainment industry.

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  • 14. 

    300 K in degree celsius will be ________

    Correct Answer
    27 degree celsius, 27 celsius, 27,27*C , 27* C
    Explanation
    300 K is equivalent to 27 degrees Celsius.

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  • 15. 

    Which of the following have negligible compressibility 

    • A.

      Liquid

    • B.

      Solid

    • C.

      Gases

    • D.

      Plasma

    Correct Answer
    B. Solid
    Explanation
    Solids have negligible compressibility because their particles are tightly packed together and have strong intermolecular forces. This makes it difficult to compress or change the volume of a solid. In contrast, liquids, gases, and plasma have more space between their particles, allowing them to be compressed more easily.

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