Explanation

• The stratosphere is the layer of the atmosphere where the ozone layer is present.
• It extends from approximately 12 to 50 kilometers (7.5 to 31 miles) above the Earth's surface.
• The ozone layer is a critical component of the Earth's atmosphere, as it absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.

Explanation

Let's calculate:

Regular wages for 40 hours = 40 * Rs. 30 = Rs. 1200

Total wages received = Rs. 1680

Overtime wages = Rs. 1680 - Rs. 1200 = Rs. 480

Overtime wage rate = 2 * Rs. 30 = Rs. 60/hour

Number of overtime hours = Overtime wages / Overtime wage rate

= Rs. 480 / Rs. 60

= 8 hours

Explanation

Explanation

• The molecular model of DNA that suggests the basic mechanism of replication was proposed by James Watson and Francis Crick.
• They proposed the double helix model of DNA in 1953, which revolutionized our understanding of genetic information storage and replication.

Explanation

The ultraviolent rays are filtered through Ozone Layer.

The ozone layer, often known as ozone shield is a part of Stratosphere.

Explanation

Explanation

• If an object absorbs all seven colors of light (i.e., all the wavelengths of visible light), it appears black.
• This is because no light is being reflected, and our eyes perceive the absence of light as black.
• When an object reflects all the component colors of light, it appears white.

Explanation

Laboratory means علم کیمیا کے امتحان کا مکان یا کارخانہ

Explanation

In the Quran and Bible, it is mentioned that the nation of Hazrat Musa (Moses, A.S.) fasted for 40 days as an act of repentance and devotion to Allah (God).

Key References:

Quran (Surah Al-Baqarah 2:51, 7:142) – Mentions Musa (A.S.) fasting for 40 days on Mount Sinai while receiving the Torah.

Bible (Exodus 34:28) – Confirms Moses fasted 40 days and nights without food or water.

Explanation

Put up is the correct collocation for displaying posters (e.g., "Put up posters on the wall").

"Up" implies affixing or posting.