- Prevents infrared rays radiation from sun reaching earth
- Prevents infrared rays reflected from earth from escaping earth’s atmosphere
- Prevents Ultraviolet rays from sun
- Reflects back Radio Wave
- C
-
Ozone layer is found in the Stratosphere.
Stratosphere is at the height of 15-30 Km from earth surface.
Ozone layer absorbs UV B radiations produce resistance tor reach earth.
Everyday Science MCQs
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Water is highly effective coolant for a car engine because:
- Water is good conductor of heat
- Water has very high specific heat capacity
- Water boils at a comparatively high temperature
- Evaporation of water produces lot of cooling
- B
-
Water is highly effective coolant for a car engine because:
Acetic Acid is commonly used in house hold as:
- Vinegar
- Vitamin C
- Lemon Juice
- Aspirin
- B
-
The Acetic Acid other names are Ethanoic Acid, Ethylic Acid, Vinegar Acid and Methane Carboxylic Acid.
When hydrogen filled balloons rises high in the atmosphere:
- It will expand
- It will shrink in size
- Its size will remain unchanged
- Will depend on air pressure
- D
-
Balloon weight became less and hydrogen gas weight became height. Due to extra upthrust balloon rises up.
Mud houses are cooler in summers and warmer in winters as compared to brick houses because:
- Mud is good conductor
- Mud is a bad conductor
- Mud is a neutral insulator by nature
- Cooling in summers and sunlight coming through holes causes warming in winters
- B
-
Mud is bad conducted of heat as compare to wood or metal.
Mud or Clay neither allows heat to enter the mud house nor allows to exit heat.
A place of metal becomes hot when it lies in the sun through:
- Conduction
- Convection
- Radiation
- Heat Energy
- C
Which vitamin is formed by action of sunlight on the skin?
- Vitamin A
- Vitamin B
- Vitamin C
- Vitamin D
- D
-
Skin absorbs UV B radiations and converted them into D3.
Vitamin D is obtained from Fish, Egg, Cheese, Beef etc.
An instrument designed to testing the purity of milk is called:
- Hydrometer
- Monometer
- Milometer
- Lactometer
- D
-
Louis Heusner invented Lactometer on 8 May 1877.
He was a Physician.
Lactometer works on the Archimedes Principle.
The most abundant elements in sea water are:
- Sodium and Potassium
- Sodium and Calcium
- Sodium and Chlorine
- Chlorine and Iodine
- C
-
There are found six elements in sea water which are Chlorine, Sodium, Calcium, Magnesium, Sulfur and Potassium.
Ph of sea water is 7.5 to 8.4.
Coolants in refrigerators and air conditioners contribute to what environmental hazard?
- Acid Rain
- Ozone Depletion
- Oil Spillage
- Global Warming
- B
-
Some refrigerators are extremely harmful for Ozone layer and greenhouse gases also.