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Class 9 (1120 questions)
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by GIANSH GUPTA KHUNDKER
· Class 9
An electric motor lifts a crate with a weight of 400 N vertically upward through a height of 5.0 meters. If this operation takes exactly 4.0 seconds, what is the useful mechanical power output of the motor?A) 320 WB) 500 WC) 2000 WD) 8000 W
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by GIANSH GUPTA KHUNDKER
· Class 9
A coastal ecosystem containing dense mangrove forests is cleared to build tourist resorts. What is a direct ecological consequence of losing these mangrove trees?
A) A rapid decrease in the salinity of the surrounding ocean water.B) Increased coastal erosion and loss of breeding grounds for marine life.C) A sudden drop in the rate of local plastic pollution.D) Enhanced protection against inland flooding.
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by GIANSH GUPTA KHUNDKER
· Class 9
Astronomers observe light from a distant galaxy and notice that its spectral lines are shifted toward longer wavelengths (redshifted). What conclusion can be drawn about the galaxy from this observation?
A) The galaxy is moving directly toward Earth, and the universe is contracting.B) The galaxy is moving away from Earth, and the universe is expanding.C) The galaxy is burning out its hydrogen fuel and cooling down.D) The galaxy is rotating faster and generating stronger gravitational forces.
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by GIANSH GUPTA KHUNDKER
· Class 9
Photovoltaic cells clean up our energy grids by converting sunlight directly into electricity. What type of energy transformation happens inside these panels?A) Chemical energy to electrical energyB) Thermal energy to kinetic energyC) Light energy to electrical energyD) Nuclear energy to mechanical energy
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by GIANSH GUPTA KHUNDKER
· Class 9
Which of the following is the most eco-friendly alternative to chemical synthetic nitrogen fertilizers in sustainable farming?
A) Untreated industrial wastewaterB) Compost and green manureC) Powdered plastic polymersD) Concentrated sulfur dioxide solutions
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by GIANSH GUPTA KHUNDKER
· Class 9
In environmental management, what does the green skill concept of "sustainable consumption" actively encourage citizens to do?
A) Purchase single-use plastics from green-certified brands.B) Increase the total extraction rate of non-renewable fossil fuels.C) Reduce the overall demand for resources by consuming only what is necessary.D) Burn municipal solid waste at home to avoid using city landfills.
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by GIANSH GUPTA KHUNDKER
· Class 9
Which of the following human activities is considered a primary driver of land degradation and the loss of natural carbon sinks?
A) Implementing drip irrigation systemsB) Large-scale deforestation for agricultureC) Practicing organic vermicompostingD) Establishing urban rooftop gardens
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by GIANSH GUPTA KHUNDKER
· Class 9
Which term describes the unique permanent trail of data, including social media posts, search history, and website cookies, that a user leaves behind while navigating the internet?A) Cyber IdentityB) Digital ProfileC) Digital FootprintD) Online Persona
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by GIANSH GUPTA KHUNDKER
· Class 9
When browsing online, what does the "s" signify in the https:// prefix of a website’s URL address?A) SystemB) SecureC) SpeedD) Server
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by GIANSH GUPTA KHUNDKER
· Class 9
Which network security tool acts as a barrier between a trusted internal network and an untrusted external network (like the Internet) to monitor and filter incoming and outgoing traffic?A) RouterB) ModemC) FirewallD) Network Switch
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by GIANSH GUPTA KHUNDKER
· Class 9
A computer network is suddenly locked by a hacker, and a pop-up window demands a cryptocurrency payment to decrypt and restore access to the files. What is this malware called?A) RansomwareB) AdwareC) Computer VirusD) Logic Bomb
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by GIANSH GUPTA KHUNDKER
· Class 9
What type of malware secretly records every keystroke made on a computer keyboard to steal user passwords, PINs, and personal conversations?A) Trojan HorseB) WormC) KeyloggerD) Rootkit
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by GIANSH GUPTA KHUNDKER
· Class 9
A user receives an urgent email appearing to be from their official bank, asking them to click a secure link and re-verify their login credentials immediately. What type of cyber attack is this?A) RansomwareB) PhishingC) Denial of Service (DoS)D) Spyware
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by GIANSH GUPTA KHUNDKER
· Class 9
An electric motor lifts a crate with a weight of 400 N vertically upward through a height of 5.0 meters. If this operation takes exactly 4.0 seconds, what is the useful mechanical power output of the motor?A) 320 WB) 500 WC) 2000 WD) 8000 W
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by GIANSH GUPTA KHUNDKER
· Class 9
Which type of electromagnetic wave has a wavelength shorter than visible light but longer than X-rays, and is commonly used for sterilizing medical equipment?A) Infrared radiationB) MicrowavesC) Ultraviolet radiationD) Gamma rays
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by GIANSH GUPTA KHUNDKER
· Class 9
Two resistors, one with a resistance of 3.0 Ω and another with a resistance of 6.0 Ω, are connected in parallel across a 12 V battery. What is the total current drawn from the battery by this parallel combination?A) 1.3 AB) 4.0 AC) 6.0 AD) 9.0 A
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by GIANSH GUPTA KHUNDKER
· Class 9
A student stands 165 meters away from a tall vertical wall and claps their hands loudly. If the speed of sound in air is 330 m/s, how much time elapses between the clap and the student hearing the echo?A) 0.5 secondsB) 1.0 secondC) 1.5 secondsD) 2.0 seconds
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by GIANSH GUPTA KHUNDKER
· Class 9
A uniform meter rule is balanced horizontally at its midpoint pivot (the 50 cm mark). A 4.0 N weight is suspended from the 20 cm mark. What force must be applied downward at the 90 cm mark to maintain horizontal equilibrium?A) 2.0 NB) 3.0 NC) 4.0 ND) 6.0 N
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by GIANSH GUPTA KHUNDKER
· Class 9
Which domestic water conservation strategy focuses on reducing the demand for treated potable (drinking) water by utilizing household wastewater from sinks, showers, and washing machines for garden irrigation?A) Rainwater harvesting from rooftopsB) Recycling greywaterC) Desalination of domestic groundwaterD) Blackwater purification systems
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by GIANSH GUPTA KHUNDKER
· Class 9
An astronaut transports a rock sample with a mass of 3.0 kg from Earth to the Moon. The gravitational field strength on Earth is 10 N/kg, and on the Moon, it is 1.6 N/kg. What are the mass and weight of the rock on the Moon?A) Mass = 0.48 kg, Weight = 4.8 NB) Mass = 3.0 kg, Weight = 30 NC) Mass = 3.0 kg, Weight = 4.8 ND) Mass = 0.48 kg, Weight = 30 N
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