General Science MCQ
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To an astronaut in space, the sky appears to be:
- Red
- White
- Dark
- Blue
Remark:
A large collection of files are called:
- folder
- records
- sectors
- database
Remark:
The stars twinkle at night because:
- they emit energy
- of diffraction
- of refraction
- of relection
Remark:
What is the frequency range of audible waves?
- 20 to 20000 Hz
- 21000 to 24000 Hz
- 25000 to 30000 Hz
- 31000 to 40000 Hz
Remark: The audible range of sound for human beings extends from about 20 Hz to 20000 Hz (one Hz = one cycle/s). Children under the age of five and some animals, such as dogs can hear up to 25 kHz (1 kHz = 1000 Hz). As people grow older their ears become less sensitive to higher frequencies.
The number of protons in an alpha particle is :
- one
- two
- three
- four
Remark:
An alternating current instead of direct current is used in long-distance electric transmission because:
- it is easy to generate
- rectification is possible
- energy losses are minimum
- it causes fewer accidents
Remark:
The process in which living organisms are used to remove contaminants, pollution or other unwanted substances from soil or water is known as:
- Biotechnology
- bioremediation
- Biodegradation
- Biomagnification
Remark:
The bats can fly in the dark because:
- they can see the objects in darkness
- they have weak legs and are likely to be attacked by predators
- they generate flashes of light
- they generate ultrasonic sound waves
Remark:
Pituitary gland is located in
- brain
- kidney
- liver
- intestine
Remark:
When a bus starts suddenly, the passengers sitting in the bus lean backward. This is because of :
- Inertia of rest
- Inertia of motion
- Momentum
- Gravity of the earth
Remark:
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