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Class 9 (1637 questions)
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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)?
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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?
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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?
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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?
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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?
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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?
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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?
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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?
Cyber
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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?
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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?
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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?
Cyber
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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?
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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?
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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?
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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?
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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?
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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?
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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?
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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?
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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?
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