All Free Everyday Science MCQs with Answers

841. Study of current and past landscapes formation is known as____________?

• A. Morphology
• B. Aero logy
• C. Geo-morphology
• D. Biology

Explanation: Geomorphology combines the study of Earth with the study of forms, so it examines how present and past landscapes were formed. Morphology is the general study of form and is not limited to landforms.

842. Isobars are the lines connecting the places having same:___________?

• A. Pressure
• B. Rainfall
• C. Height
• D. Temperature

Explanation: Isobars are lines on a weather map joining places with equal atmospheric pressure. Equal-temperature lines are called isotherms, so temperature is the common trap.

843. The top atmosphere of the Earth directly reflects back into space nearly what part of the total amount of sun's energy coming to it?

• A. 10%
• B. 20%
• C. 30%
• D. 50%Chemistry

Explanation: Earth's atmosphere, clouds, and surface reflect roughly 30% of incoming solar radiation back to space, an amount called Earth's albedo. The remaining energy is absorbed by the atmosphere and surface or otherwise redistributed.

844. An example of an abiotic component __________?

• A. Plants
• B. Soil
• C. Animals
• D. Bacteria

Explanation: Soil is abiotic, meaning it is a non-living part of an ecosystem, although it supports living organisms. Plants, animals, and bacteria are biotic components because they are living.

845. Pollutants that are introduced into the environment by human activity are called as ___________?

• A. Qualitative pollutants
• B. Quantitative pollutants
• C. Anthropogenic pollutant
• D. All of Above

Explanation: Pollution caused by human activities is described as anthropogenic pollution, from Greek roots meaning human-made. Qualitative and quantitative describe kinds or amounts of pollutants, not their human origin.

846. Basidiospores are considered to be a major source of ___________?

• A. airborne allergens
• B. water borne allergens
• C. animal faeces
• D. bio-weapon

Explanation: Basidiospores are reproductive spores released by fungi such as mushrooms and bracket fungi, and they can become airborne. Inhalation of these spores may trigger respiratory allergies.

847. The species that flower are called ______________?

• A. Gymnosperms
• B. Bryophytes
• C. Angiosperms
• D. Algae

Explanation: Angiosperms are flowering plants whose seeds are enclosed within fruits. Gymnosperms produce exposed seeds, while bryophytes and algae do not form true flowers.

848. The instrument that measures temperature, pressure, and humidity at various altitudes in the atmosphere ___________?

• A. Barograph
• B. Radiosonde
• C. Aneroid barometer
• D. Altimeter

Explanation: A radiosonde is carried upward by a weather balloon and transmits measurements of temperature, pressure, and humidity at different altitudes. A barograph records pressure, whereas an altimeter mainly indicates altitude.

849. Melanoma (skin cancer) is associated with ______________?

• A. ozone accumulation
• B. ozone depletion
• C. acid rain
• D. allergens

Explanation: Ozone depletion allows more ultraviolet-B radiation to reach Earth's surface, increasing the risk of DNA damage and skin cancers such as melanoma. Ozone accumulation in the stratosphere is protective rather than harmful in this context.

850. The earth's atmosphere is divided into layers based on the vertical profile of __________?

• A. Air pressure
• B. Air temperature
• C. Air density
• D. Wind speed

Explanation: The atmosphere is divided into the troposphere, stratosphere, mesosphere, thermosphere, and exosphere mainly according to how temperature changes with altitude. Pressure and density also change vertically, but they are not the basis of this standard layering.