Correct Answer: C
Explanation:
Explanation:
The correct answer is:
✅ C) Acceleration
Acceleration is defined as the rate of change of velocity with respect to time.
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1. What is the term used to describe the rate of change of velocity?
A
Speed
B
Velocity
C
Acceleration
D
Force
The correct answer is:
Acceleration is defined as the rate of change of velocity with respect to time.
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2. If an object is said to be in uniform motion, it means
A
The object is at rest
B
The object covers equal distances in equal intervals of time
C
The object is moving at a changing speed
D
The object is moving in a curved path
The correct answer is:
This is the definition of uniform motion — motion with a constant speed.
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3. Which of the following statements is true about pressure?
A
Pressure is directly proportional to the force applied
B
Pressure is inversely proportional to the area over which the force is applied
C
Both A and B
D
Neither A nor B
Pressure = Force / Area
So, it increases when force increases → directly proportional to force
And it decreases when area increases → inversely proportional to area
Hence, both statements A and B are true.
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4. If the area over which a force is applied is doubled, what happens to the pressure?
A
It doubles
B
It is halved
C
It stays the same
D
. It is quadrupled
Pressure ($\text{P}$) is defined as the force ($\text{F}$) applied per unit area ($\text{A}$).
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5. The pressure exerted by a liquid depends on
A
Its density and the depth of the liquid
B
The volume of the liquid
C
The color of the liquid
D
The temperature of the liquid
The correct answer is A) Its density and the depth of the liquid.
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6. What is the SI unit of pressure?
A
Newton
B
Pascal
C
Joule
D
Watt
The Pascal ($\text{Pa}$) is the SI unit of pressure. It is named after the French mathematician and physicist, Blaise Pascal
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7. Pressure is defined as force applied per unit
A
Volume
B
Mass
C
Area
D
Distance
Pressure ($\text{P}$) is defined as the force ($\text{F}$) applied per unit area ($\text{A}$).
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8. What is the SI unit of force?
A
Joule
B
Newton
C
Watt
D
Ohm
The Newton ($\text{N}$) is the SI unit of force. It is named after Sir Isaac Newton in recognition of his contributions to classical mechanics, particularly his laws of motion.
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9. In which medium does light travel the fastest?
A
Air
B
Water
C
Glass
D
Vacuum
Light travels fastest in a vacuum, which is a space completely devoid of matter.
The speed of light in a vacuum ($c$) is the absolute speed limit of the universe, with a value of approximately $299,792,458$ meters per second (or about $186,282$ miles per second).
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10. What is the primary function of the lens in the human eye?
A
To reflect light
B
To focus light onto the retina
C
To change the color of light
D
To scatter light
The primary function of the lens (or crystalline lens) in the human eye is to provide the fine-tuning of focus required to create a clear image.
The lens works in conjunction with the cornea (which does the majority of the initial light bending).
The lens changes shape (a process called accommodation) via the ciliary muscles to adjust the focal length.
This adjustment ensures that light rays coming from objects at various distances are precisely converged onto the light-sensitive layer at the back of the eye, called the retina.
The clarity of vision depends on the lens successfully bringing the light to a sharp focus on the retina.
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11. What does the law of reflection state?
A
The angle of incidence is equal to the angle of refraction
B
The angle of incidence is equal to the angle of reflection
C
The angle of incidence is half of the angle of reflection
D
None of the above three
The correct answer is B) The angle of incidence is equal to the angle of reflection.
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12. Which of the following colors of light has the shortest wavelength?
A
Red
B
Green
C
Blue
D
Violet
The color of visible light is determined by its wavelength. The entire spectrum of visible light, from longest to shortest wavelength, is known by the acronym ROYGBIV:
Red
Orange
Yellow
Green
Blue
Indigo
Violet
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13. Which of the following is the hardest allotrope of carbon?
A
Graphite
B
Fullerene
C
Diamond
D
Coal
Diamond is the hardest known natural material and is the hardest allotrope of carbon.
Allotrope: A different structural form of the same element.
Structure: In diamond, each carbon atom is bonded to four other carbon atoms in a strong, three-dimensional tetrahedral structure. This rigid, tightly packed crystalline lattice is what gives diamond its extreme hardness and high density.
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14. Which planet has rings around it?
A
Saturn
B
Mars
C
Mercury
D
Venus
Saturn is the most famous planet for having a spectacular and complex system of rings. While Jupiter, Uranus, and Neptune also have rings, Saturn's are the largest and most prominent.
Composition: The rings are not solid, but are made up of billions of pieces of ice and rock that range in size from tiny dust grains to objects as large as mountains.
Size: The main ring system extends hundreds of thousands of kilometers from the planet but is extremely thin, generally less than a kilometer thick.
Visibility: They are the only planetary rings in our solar system that are easily visible with a simple telescope from Earth.
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15. What is the phenomenon that occurs when the Moon passes between the Earth and the Sun?
A
Solar eclipse
B
Lunar eclipse
C
Meteor shower
D
Comet tail
A solar eclipse is a astronomical event that occurs when the Moon passes directly between the Sun and Earth, temporarily blocking the Sun's light and casting a shadow on Earth.
For a total solar eclipse to occur, the Sun, Moon, and Earth must be perfectly aligned (in syzygy).
Solar Eclipse: Moon is between the Sun and Earth (Sun $\rightarrow$ Moon $\rightarrow$ Earth). The Moon blocks the Sun.
Lunar Eclipse: Earth is between the Sun and Moon (Sun $\rightarrow$ Earth $\rightarrow$ Moon). The Earth's shadow falls on the Moon.
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16. What is the name of Earth's natural satellite?
A
Star
B
Moon
C
Commet
D
Meteor
The Moon is Earth's only permanent natural satellite.
A natural satellite (or moon) is an astronomical body that orbits a planet or minor planet.
The Moon is the fifth largest moon in the Solar System.
It is in synchronous rotation with Earth, meaning the same side is always facing us.
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17. What is the name of the fifth planet from the Sun?
A
Neptune
B
Uranus
C
Jupiter
D
Mars
The planets in our Solar System are numbered by their average distance from the Sun. Jupiter is the fifth planet from the Sun.
Here is the order of the eight major planets, starting closest to the Sun:
Mercury
Venus
Earth
Mars
Jupiter (The largest planet)
Saturn
Uranus
Neptune
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18. Which planet is the largest in our Solar System?
A
Earth
B
Uranus
C
Jupiter
D
Saturn
Jupiter is the largest planet in our Solar System.
It is a gas giant, meaning it is primarily composed of hydrogen and helium.
Its mass is more than two and a half times the mass of all the other planets in the Solar System combined.
It is so large that over 1,300 Earths could fit inside it.
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19. Which planet is known as the "Red Planet"?
A
Venus
B
Mars
C
Jupiter
D
Saturn
Mars is known as the "Red Planet" because of the abundance of iron oxide (rust) on its surface, which gives it a distinctive reddish-orange hue.
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20. What is the main source of energy for the Sun?
A
Nuclear fusion
B
Chemical reactions
C
Electrical energy
D
Gravitational energy
Nuclear fusion is the main process that powers the Sun and other stars.
Process: In the Sun's core, incredibly high temperatures (around 15 million degrees Celsius) and immense pressure strip electrons from atoms, creating a plasma.
Reaction: Under these extreme conditions, hydrogen nuclei (protons) are forced together to fuse, forming a single, heavier helium nucleus.
Energy Release: This fusion process results in a small amount of mass being converted directly into a massive amount of energy, as described by Einstein's famous equation, $E = mc^2$.
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21. What is the process of a liquid turning into a gas called?
A
Freezing
B
Condensation
C
Evaporation
D
Melting
Evaporation (or Vaporization) is the process where a substance changes from the liquid phase to the gas phase.
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22. What happens to the particles of a substance when it is heated?
A
The particles slow down and move closer together.
B
The particles stay the same.
C
The particles move faster and spread apart.
D
The particles stop moving.
The correct answer is C) The particles move faster and spread apart.
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23. Which state of matter has both a definite shape and a definite volume?
A
Solid
B
Liquid
C
Gas
D
Plasma
The state of matter that has both a definite shape and a definite volume is A) Solid.
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24. Which of the following is an example of a gas at room temperature?
A
Ice
B
Water
C
Oxygen
D
Iron
Oxygen ($\text{O}_2$) is a gas at standard room temperature and pressure. It is one of the main components of the air we breathe.
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25. What is the process of a solid turning directly into a gas called?
A
Sublimation
B
Evaporation
C
Condensation
D
Freezing
Sublimation is the physical process where a substance transitions directly from the solid phase to the gas phase without passing through the intermediate liquid phase.
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26. What is the term used to describe an organism that has both male and female reproductive organs?
A
Hermaphrodite
B
Bisexual
C
Unisexual
D
Monoecious
The most common and technically accurate term used to describe an organism that has both male and female reproductive organs is A) Hermaphrodite.
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27. Which type of reproduction involves only one parent?
A
Sexual reproduction
B
Asexual reproduction
C
Internal fertilization
D
External fertilization
Asexual reproduction is a type of reproduction that involves only one parent and produces offspring that are genetically identical to the parent.
Asexual Reproduction $\rightarrow$ One parent, no mixing of genetic material.
Sexual Reproduction $\rightarrow$ Two parents, involves the fusion of gametes (sperm and egg) and mixing of genetic material.
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28. Brahmi exhibits which of the following pharmacological properties?
A
Neuroprotective and antioxidant
B
Antihistamine and decongestant
C
Sedative and analgesic
D
Hypoglycemic and anti-inflammatory
Neuroprotective and antioxidant
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29. Ephedra is commonly used in the treatment of:
A
Malaria
B
Gastric ulcers
C
Diabetes
D
Asthma and nasal congestion
Asthma and nasal congestion
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30. Cinchona belongs to which plant family?
A
Rubiaceae
B
Rutaceae
C
Fabaceae
D
Solanaceae
Rubiaceae
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31. Which of the following is a traditional use of Aloe vera gel?
A
Treating burns and wounds
B
Managing hypertension
C
Reducing anxiety
D
Treating joint pain
Treating burns and wounds
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32. What is the mode of action of Senna as a laxative?
A
Increasing bile secretion
B
Stimulating peristalsis of the colon
C
Inhibiting water absorption in the intestines
D
Neutralizing stomach acid
Stimulating peristalsis of the colon
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33. Ipecac is derived from which part ofthe plant?
A
Roots and rhizomes
B
Leaves
C
Flowers
D
Seeds
Roots and rhizomes
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34. The primary bioactive compounds in Ashwagandha are:
A
Flavonoids
B
Withanolides
C
Saponins
D
Tannins
Withanolides
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35. Murexide test is used to detect which class of the following alkaloids?
A
Tropane
B
Purine
C
Quinoline
D
Indole
Purine
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