Question 1
, Q. An astronomical unit or light year is used for:
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Distance
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Time period
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Light intensity
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Time
Explanation:
Both astronomical units and light-years are units used to measure distances in space.
Question 2
The use of antibiotics is a very effective way of killing disease-causing bacteria. Sometimes people don’t finish all of their pills. This can result in:
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Some bacteria left un-killed
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Production of more bacteria
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Bacteria becoming sensitive to antibiotics
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Bacteria becoming resistant to antibiotics
Explanation:
Incomplete antibiotic use allows surviving bacteria to develop resistance to the drug.
Question 3
Proteins are made up of:
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Polynucleotide
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Polypeptide
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Oxyacetylene
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None of these
Explanation:
Proteins consist of polypeptide chains formed by amino acids linked through peptide bonds.
Question 4
The principle used in radar is the same as that of sonar. In radar, we use radio waves, whereas in sonar, we use:
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Red waves
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Infrared waves
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Ultrasonic waves
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Supersonic waves
Explanation:
Sonar uses ultrasonic sound waves to detect objects underwater.
Question 5
How is dengue fever transmitted?
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Bite of an infected mosquito
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Bite of an infected male Aedes mosquito
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Bite of an infected female Anopheles mosquito
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Bite of an infected female Aedes mosquito
Explanation:
Dengue is transmitted by the bite of an infected female Aedes mosquito.
Question 6
The sky is blue because of:
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Rayleigh scattering
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Reflection
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Mie scattering
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Absorption
Explanation:
The blue color of the sky is due to Rayleigh scattering of shorter wavelengths of light.
Question 7
Cyclones:
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Experience Coriolis effects that deflect air to the right in the Southern Hemisphere
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Are associated with super geotropic winds
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Are typically regions of fair weather
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Are associated with low-pressure systems
Explanation:
Cyclones are low-pressure systems characterized by strong winds and stormy weather.
Question 8
Rainbow formation is due to:
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Absorption of sunlight by water droplets
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Diffusion of sunlight through water droplets
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Ionization of water droplets
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Refraction and reflection of sunlight by water droplets
Explanation:
Rainbows form due to refraction, reflection, and dispersion of sunlight in water droplets.
Question 9
The layer of the atmosphere in which the ozone layer lies is:
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Exosphere
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Mesosphere
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Troposphere
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Stratosphere
Explanation:
The ozone layer is located in the stratosphere where it absorbs ultraviolet radiation.
Question 10
Which distance is bigger—an astronomical unit (AU) or a light-year (LY)?
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An astronomical unit (AU)
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Neither one is a measurement of distance
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They’re both about the same distance
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A light-year (LY)
Explanation:
A light-year is far greater than an astronomical unit, as it measures the distance light travels in a year.
Question 11
The rotation in which the Earth rotates is from:
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West to east
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East to west
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North to south
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South to north
Explanation:
Earth rotates from west to east, causing the apparent motion of the Sun.
Question 12
A collection of water droplets that are suspended in air is called:
Explanation:
Clouds are formed by tiny water droplets or ice crystals suspended in the atmosphere.
Question 13
How many calories should you eat per day to lose weight?
Explanation:
A calorie intake of around 1500 per day often helps create a deficit for weight loss.
Question 14
The time interval to complete one rotation of the Earth around its own axis is:
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22 hours
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23 hours
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23 hours 56 minutes
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None of these
Explanation:
The Earth completes one rotation in approximately 23 hours and 56 minutes (sidereal day).
Question 15
Enzymes in human bodies are:
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Proteins
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Viruses
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Bacteria
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None of these
Explanation:
Enzymes are proteins that act as biological catalysts to speed up chemical reactions.
Question 16
Antibiotics are used to fight against:
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Proteins
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Viruses
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Bacteria
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None of these
Explanation:
Antibiotics are effective against bacteria but not viruses.
Question 17
Radio waves broadcast by radio broadcasting are reflected by:
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Ionosphere
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Stratosphere
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Mesosphere
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None of these
Explanation:
The ionosphere reflects radio waves, enabling long-distance communication.
Question 18
During combustion of petrol in a car engine, energy is converted into:
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Chemical
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Mechanical
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Electrical
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None of these
Explanation:
The chemical energy of the fuel is converted into mechanical energy to run the engine.
Question 19
A barometer is used for measuring:
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Temperature
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Humidity
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Pressure
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None of these
Explanation:
A barometer measures atmospheric pressure.
Question 20
An ionic bond between two atoms is:
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Complete transfer of valence electrons
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Half transfer of valence electrons
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Complete transfer of electrons
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None of these
Explanation:
An ionic bond forms when valence electrons are completely transferred from one atom to another.