Question 1
Night blindness is caused due to the deficiency of:
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Vitamin A
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Vitamin B
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Vitamin C
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Vitamin D
Explanation:
Vitamin A deficiency affects vision by impairing rhodopsin formation, leading to difficulty seeing in low light.
Question 2
A light-sensitive device that converts drawings, printed text, or other images into digital form is:
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Scanner
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Printer
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Bluetooth
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None of these
Explanation:
A scanner captures images and text using light sensors and converts them into digital format.
Question 3
The energy which is unavailable in a system is called:
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Increased
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Decreased
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Entropy
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None of these
Explanation:
Entropy represents the portion of energy in a system that is unavailable for useful work due to disorder.
Question 4
Which of the following produces seeds but not fruits?
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Gymnosperms
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Mint
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Maize
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None of these
Explanation:
Gymnosperms produce naked seeds without enclosing them in fruits.
Question 5
When is the Earth closest to the Sun?
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In winter
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In summer
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In spring
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None of these
Explanation:
Earth is closest to the Sun at perihelion in early January, not strictly tied to a season.
Question 6
The blue color of the sky is due to:
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Reflection of light rays
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Refraction of light rays
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Scattering of light rays
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None of these
Explanation:
The sky appears blue due to Rayleigh scattering, where shorter wavelengths scatter more in the atmosphere.
Question 7
Which atmospheric layer contains ions and helps in wireless communications?
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Thermosphere
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Stratosphere
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Ionosphere
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None of these
Explanation:
The ionosphere contains charged particles that reflect radio waves, enabling long-distance communication.
Question 8
A covalent bond is between two atoms when they:
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Share 1 or more protons
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Share 1 or more electrons
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Both A and B
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None of these
Explanation:
Covalent bonds form when atoms share one or more pairs of electrons.
Question 9
The weight of an object on the Moon is ___ the weight of the object on Earth:
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1/6th
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1/7th
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1/8th
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None of these
Explanation:
The Moon’s gravitational force is about one-sixth that of Earth, reducing object weight accordingly.
Question 10
What is the name of tropical cyclones in the China Sea?
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Typhoon
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Tornado
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Hurricane
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None of these
Explanation:
Tropical cyclones in the western Pacific region, including the China Sea, are called typhoons.
Question 11
Rotation of the Earth causes:
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Day
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Night
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Both A and B
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None of these
Explanation:
Earth’s rotation causes alternating exposure to sunlight, resulting in day and night.
Question 12
The Spanish influenza of 1918–19 was caused by which influenza virus?
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H1N2
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H3N1
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H1N1
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None of these
Explanation:
The Spanish flu pandemic was caused by the H1N1 strain of the influenza virus.
Question 13
Artificial noise is a:
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Vibration
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Vocal cord
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Both A and B
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None of these
Explanation:
Artificial noise originates from mechanical vibrations such as machines and engines.
Question 14
The example of cold-blooded animals is/are:
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Crow, cobra, frog
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Frog, pigeon, wall lizard, earthworm
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Penguin, salamander, monkey
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None of these
Explanation:
Cold-blooded animals include reptiles and amphibians, but no option lists only such animals correctly.
Question 15
A collection of system programs that controls and coordinates the overall operations of a computer system is called:
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Operating System
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CPU
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Software
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None of these
Explanation:
An operating system manages hardware and software resources and controls system operations.
Question 16
Diseases that spread from person to another are called:
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Communicable diseases
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Degenerative diseases
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Non-communicable diseases
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None of these
Explanation:
Communicable diseases are transmitted from one person to another through various means.
Question 17
Which is the hottest planet in our solar system?
Explanation:
Venus has the highest surface temperature due to its dense atmosphere and greenhouse effect.
Question 18
Excess bleeding during an injury is a deficiency of:
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Vitamin K
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Vitamin B
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Vitamin A
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Vitamin D
Explanation:
Vitamin K is essential for blood clotting, and its deficiency leads to excessive bleeding.
Question 19
The ozone layer is present in:
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Thermosphere
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Stratosphere
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Troposphere
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None of these
Explanation:
The ozone layer is located in the stratosphere, where it absorbs harmful ultraviolet radiation.
Question 20
The place in the environment where a plant or animal naturally or normally lives and grows is known as:
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Habitat
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Shelter
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Tree
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None of these
Explanation:
A habitat is the natural environment that provides the necessary conditions for an organism to live and grow.