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Class 9 (1226 questions)
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by GIANSH GUPTA KHUNDKER
· Class 9
When a dark grey solid element is heated, it changes directly into a purple gas without melting. What is this phase change called?A) BoilingB) EvaporationC) MeltingD) Sublimation
Science
Other
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by GIANSH GUPTA KHUNDKER
· Class 9
Why is aluminium unreactive with air under normal conditions?A) It is covered with a protective layer of oxideB) It sits very low in the reactivity seriesC) It is produced via the electrolysis of its oxideD) It has an extremely high melting point
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by GIANSH GUPTA KHUNDKER
· Class 9
Which plant tissue is responsible for transporting water and minerals from the roots to the leaves?A) PhloemB) XylemC) CortexD) Cambium
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by GIANSH GUPTA KHUNDKER
· Class 9
Which part of the cell contains the genetic material?A) CytoplasmB) Cell wallC) NucleusD) Mitochondrion
Science
Tissues
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by GIANSH GUPTA KHUNDKER
· Class 9
Which of the following correctly groups quantities into scalars (magnitude only) and vectors (magnitude and direction)?A) Scalar: Force | Vector: SpeedB) Scalar: Displacement | Vector: VelocityC) Scalar: Mass | Vector: WeightD) Scalar: Acceleration | Vector: Distance
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by GIANSH GUPTA KHUNDKER
· Class 9
A student moves a permanent bar magnet quickly into a stationary coil of wire connected to a sensitive center-zero galvanometer, causing the needle to deflect momentarily to the right. Which action will cause the needle to deflect to the left?A) Holding the magnet completely stationary inside the coil.B) Pulling the coil away from the stationary magnet in the same direction.C) Pulling the bar magnet quickly out of the coil.D) Moving the identical South pole of the magnet into the coil same speed
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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
Cyber
Other
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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
Cyber
Other
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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
Cyber
Other
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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
Cyber
Other
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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
Cyber
Other
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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
Cyber
Other
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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
Green Warrior
Other
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