Explanation

Surface tension acts like a stretched membrane on the water's surface, and the surface tension along the blade's edges is greater than the blade's weight.

The force of surface tension acts tangentially to the liquid surface on the circumference of the blade.

Explanation

The Strait of Gibraltar connects two large water bodies, the Atlantic Ocean & Mediterranean Sea.

they lie between southernmost Spain and northwesternmost Africa.

The Strait of Gibraltar is located in the Iberian Peninsula (Spain)

The Sea separates Europe from Africa

Explanation

Note: according to Fpsc answer key  the correct  ans is green light

Since the maximum absorption by chlorophyll occurs in red light.

It is the most effective wavelength for photosynthesis.

Chlorophyll strongly absorbs red light.

Thus it is effective at photosynthesis.

All important questions and Information Related to 'Photosynthesis"

Photosynthesis takes place in the presence of the following light Only in sunlight from the sun

Photosynthesis takes place faster in white light

Photosynthesis occurs more in blue and red light rays

Photosynthesis occurs more in blue and red light rays and less, or not at all, in green light rays.

ND2-03-2023

Explanation

The common refrigerant used in domestic Refrigerator is Ammonia

Ammonia, frequently used commercially in large freezing and refrigeration plants is also called “anhydrous ammonia”

because it contains almost no water (it is 99.98% pure).

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Explanation

• Sunlight is a good source of vitamin D.
• When our skin is exposed to sunlight, it produces vitamin D, which is essential for bone health, immune function, and the regulation of calcium levels in the blood.
• Deficiency of Vitamin D results in Rickets.

Explanation

The permanent hardness of water is caused by Chloride, Nitrates, Calcium and Sulphates of Magnesium 

Permanent Hardness is not precipitated by boiling 

It is removed by Zeolite

Additional Information:

The Presence of Calcium and Magnesium Bicarbonates causes temporary hardness of water 

Temporary hardness can be removed by boiling the water

Explanation

A weather balloon is not fully inflated on the ground because the air inside the balloon would expand and may burst as it rises.

The atmosphere is less dense at higher altitudes, so the pressure inside the balloon becomes greater than the pressure outside.

This causes the balloon to expand until it reaches its elastic limit and bursts.

Weather balloons typically burst at altitudes of over 15 miles (24.1 kilometers).

If a balloon were fully inflated on the ground, the gas would need to be vented out and wasted as it expands. 

Explanation

• Tungsten is very resistant to corrosion and has the highest melting point (melting point = 3695 K) and the highest tensile strength of any element.
• Tungsten is used for making bulb filaments of incandescent lamps because it has the highest melting point and does not melt even while it is glowing for long hours.

Explanation

• Television signals cannot be received ordinarily beyond a particular distance due to the curvature of the earth.

Key Points

• Signal waves travel in a straight line from the transmitting antenna to the receiving antenna. The signal transmitted from a TV tower cannot be received beyond a certain distance because the surface of the Earth is curved.
• This is due to, after going a certain distance the frequency of television signals decreases while their wavelength increases.
• Signal waves transmitted from a transmitter get absorbed or blocked by the curvature of Earth and are not received. 

Additional Information

• Signal:
  • Information converted in electrical form and suitable for transmission is called a signal.
  • Signals can be either analog or digital.

Explanation

The sun is visible a little before it rises and a little after it sets because of atmospheric refraction.

Refraction is the phenomenon that occurs when light changes direction as it passes from one transparent medium to another.