EVERYDAY SCIENCE BOOKS PDF

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Everyday Science Notes By National Officers Acadmy NOA. Format: PDF Categories: CSS General Science & Ability Books, General Science & Ability Notes. Download CSS Booklet Everyday Science Complied Book for CSS Compulsory Subject General Science & Ability. This is a complied version and all data has. Download CSS Everyday Science MCQS Book for Free. The CSS Point pensugetheatcie.cf pensugetheatcie.cf


Everyday Science Books Pdf

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Download free PDF Book, EVERY DAY SCIENCE For Competitive Examination By Dr. M. Akram Kashmiri. View Everyday Science Complied pensugetheatcie.cf from FINANCE at University of Karachi. PMS/CSS Everyday Science Compiled by: Engr. Syed Muhammad. SURROUNDED BY SCIENCE. everyday SCIENCE. The Museum of Science , Boston, has a long-standing commitment to developing exhibits for people.

Ans: The light from the stars travels through different layers of space of varying densities. Therefore, the light rays deviate from their original path.

Further, these layers are not stationary but keep on moving. This leads to the twinkling of stars. And why? Ans: On 23 September and 21 March we have equal days and nights all over the world. This is so because on these days, the rays of the sun fall vertically on the equator at noon. Both the poles receive equal rays of the sun. As a result, exactly one-half of each hemisphere receives the suns rays.

This makes day and night equal.

Ans: One revolution of the earth around the sun takes days and 6 hours. But we consider a year as consisting of only days and ignore 6 hours. In four years the difference becomes as much as 24 hours or one day.

Hence, to every fourth year we add one day. That year of days is known as leap year. Ans: Igneous rocks are formed when the molten material from volcanoes gets solidified.

This material is liquid, hot and sticky which moves towards the surface through cracks and joints. All other rocks derived from these rocks. Hence, they are called primary or parent rocks. Ans: These areas are very cold because the sun does not rise much above the horizon. Therefore, its rays are always very slanting which emit minimum heat. These areas being very cold are called Frigid Zones. Ans: The three hot regions of the world-equatorial forests, savannah lands and hot deserts-are not found in Europe because Europe is the only inhabited continent situated entirely outside the tropics.

Ans: The lowest layer of the atmosphere in contact with the earths surface is the warmest because the atmosphere is heated mainly from the below. Ans: Temperature above the oceans and land masses varies even on the same latitude because of the differential heating of land and water, i.

Ans: As marine animals do not depend upon sunlight for their survival, they are able to live at great depths where there is permanent darkness. Ans: The needle-like leaves limit transpiration and thus enable conifers to grow in the drier areas. Ans: In equatorial forests trees often shed a few leaves or shed their leaves seasonally, but most of the trees retain their leaves for most of the time so that the forests appear evergreen. Ans: Petroleum is often called black gold because of its great demand in the modern industry and for domestic use.

CSS Everyday Science Notes By NOA

It provides fuel for heat and lighting, lubricant for machinery and raw material for a number of industries. Ans: Marsupial means broad-pouch. Since kangaroos have a pouch-like fold of skin near the stomach in which they carry their young ones, they are called marsupials.

Ans: Platypus is a strange animal because it is an animal-bird that survives under water, walks on the ground and digs tunnel under the ground. It is a four-legged animal that lays eggs like a bird. It is found in Australia. Ans: A person in a moving vehicle is in a state of motion.

When the vehicle suddenly stops his body tends to remain in a state of motion due to inertia and he is thrown forward. Why does not the moon fall on to the earth? Ans: Glass is more elastic than rubber because for a given applied force per unit area, the strain produced in glass is much more than that produced in rubber. Ans: The camel has very broad and large feet. As a result of the large surface area in contact with the ground, it exerts less pressure on the sand and sinks only slightly in it.

Other animals have smaller feet which exert more pressure on the sand. As a result, they sink more in the sand and cannot walk easily in desert.

Everyday Science & GSA Important and Repeated Solved MCQs with Flashcards and PDF, Part 1

Ans: A small quantity of liquid assumes a spherical form due to surface tension which tends to reduce the surface area. A given mass will acquire minimum surface area if it assumes a spherical shape. Ans: Due to surface tension, the free surface of liquid at rest behaves like a stretched membrane. When an iron needle floats on the surface of clean water, its weight is supported by the stretched membrane.

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When some detergent is added to this water, its surface tension decreases. As a result of it, the stretched membrane on the surface of water is weakened and is not able to support the weight of needle. Hence the needle sinks in such water. Ans: The boiling point of water depends upon the pressure on its surface. Steam produced inside the cooker builds up pressure thereby raising the boiling point of water, which results in quick cooking.

Ans: The amount of heat latent heat possessed by steam is much greater than the amount of heat possessed by water at the same temperature. Therefore, steam causes more severe burns 10 www. Ans: When salt is sprinkled over ice, some of it dissolves.

As dissolution of the salt is accompanied by absorption oh heat. The temperature of the system falls below 0 degree Celsius. Hence, ice does not melt readily. Ans: the water which comes out of the firemans hose carries large momentum as its velocity i s very high. The equal and opposite reaction force pushes the fireman backwards with a great speed satisfying the law of conservation of momentum.

As a result, it is difficult for the fireman to hold the hose. Ans: sound waves need a material medium for its propagation. There is no air in space and hence, sound waves cannot travel. However, radio waves can travel through space. The astronauts can see each other because light, like radio waves, can travel through vacuum. Ans: sonar scanners send out ultrasonic waves, which are reflected by body tissue and organs. From the pattern of reflections, a computer can build up an image of the internal structure which is vital for diagnosis.

Ans: the velocity of light is much greater than that of the sound. Therefore, flash of lightning is seen before the sound of thunder is heard. Also, dolphins can avoid fishing nets and can detect fish at night. Explain Ans: Bats emit high frequency 1, 20, Hz sound waves and listen with their sensitive ears for any echoes. From the time taken to hear the echo and from the nature of sound received. Bats are able to estimate the distance and the type of surroundings. This process is known as echolocation.

Same process is used by the dolphins. Why is it so? Due to the interference between the direct signal and the reflected signal, there is disturbance on the TV screen. Earth 7 Fertilizers 46 9. Atmosphere 8 Pesticides 47 Weather 9 Microwave ovens 47 Cloud 12 Immunization 48 Rain 13 Fingerprinting 49 Acid Rain 14 Infra Red Radiation 50 Minerals 17 Greenhouse Effect 50 Rock Mineral 17 Antimatter 53 Mineral Deposit 19 Magma 54 Lava 20 Brain 55 Solar and Lunar Eclipses 22 Heart 60 Day and Night and their variation 23 Tissues 68 Energy 23 Epithelial Cell 68 Thus the warm temperature is maintained.

Some people snore during their sleep because the breathing action produces sound. This is so because the pharynx or the windpipe offers resistance to the air taken in or expelled.

Sleep walk is a sort of disorder of sleep in which a person starts walking during his sleep. The sleeper walks and performs complex activities automatically without regaining consciousness.

While climbing a mountain, a climber bends his body forward in order to keep the centre of gravity of his body within two thirds portion. According to this principle the Pisa Tower is not falling. The climbers are mostly parasites and they cannot manufacture their food.

Therefore, they climb on other trees and get food from them. Mars is called the red planet because its colour is red due to the desert like surface. Vitamin D is necessary for body because it is essential for bone formation and retention of calcium in the human body. Vitamin D also protects the teeth. The weight of an object is the product of mass and force of gravity. The equatorial diameter is more than the polar diameter. Thus, the force of gravity is more at the poles and the weight is more there.

All of them do not sweat; they use the above mentioned mechanisms to cool themselves. Because the distance remains the same. The light from the stars travels through different layers of space of varying densities. Therefore, the light rays deviate from their original path.

Further, these layers are not stationary but keep on moving. This leads to the twinkling of stars. And why? On 23 September and 21 March we have equal days and nights all over the world.

This is so because on these days, the rays of the sun fall vertically on the equator at noon. Both the poles receive equal rays of the sun. As a result, exactly one-half of each hemisphere receives the suns rays. This makes day and night equal. One revolution of the earth around the sun takes days and 6 hours. But we consider a year as consisting of only days and ignore 6 hours. In four years the difference becomes as much as 24 hours or one day.

Hence, to every fourth year we add one day. That year of days is known as leap year. Igneous rocks are formed when the molten material from volcanoes gets solidified. This material is liquid, hot and sticky which moves towards the surface through cracks and joints.

All other rocks derived from these rocks. Hence, they are called primary or parent rocks. These areas are very cold because the sun does not rise much above the horizon. Therefore, its rays are always very slanting which emit minimum heat. These areas being very cold are called Frigid Zones. The three hot regions of the world-equatorial forests, savannah lands and hot deserts-are not found in Europe because Europe is the only inhabited continent situated entirely outside the tropics.

The lowest layer of the atmosphere in contact with the earths surface is the warmest because the atmosphere is heated mainly from the below. Temperature above the oceans and land masses varies even on the same latitude because of the differential heating of land and water, i. As marine animals do not depend upon sunlight for their survival, they are able to live at great depths where there is permanent darkness.

The needle-like leaves limit transpiration and thus enable conifers to grow in the drier areas. In equatorial forests trees often shed a few leaves or shed their leaves seasonally, but most of the trees retain their leaves for most of the time so that the forests appear evergreen. Petroleum is often called black gold because of its great demand in the modern industry and for domestic use. It provides fuel for heat and lighting, lubricant for machinery and raw material for a number of industries.

Marsupial means broad-pouch. Since kangaroos have a pouch-like fold of skin near the stomach in which they carry their young ones, they are called marsupials. Platypus is a strange animal because it is an animal-bird that survives under water, walks on the ground and digs tunnel under the ground. It is a four-legged animal that lays eggs like a bird. It is found in Australia. A person in a moving vehicle is in a state of motion.

When the vehicle suddenly stops his body tends to remain in a state of motion due to inertia and he is thrown forward. Why does not the moon fall on to the earth? Glass is more elastic than rubber because for a given applied force per unit area, the strain produced in glass is much more than that produced in rubber.

The camel has very broad and large feet. As a result of the large surface area in contact with the ground, it exerts less pressure on the sand and sinks only slightly in it. Other animals have smaller feet which exert more pressure on the sand.

As a result, they sink more in the sand and cannot walk easily in desert. A small quantity of liquid assumes a spherical form due to surface tension which tends to reduce the surface area. A given mass will acquire minimum surface area if it assumes a spherical shape. Due to surface tension, the free surface of liquid at rest behaves like a stretched membrane. When an iron needle floats on the surface of clean water, its weight is supported by the stretched membrane.

When some detergent is added to this water, its surface tension decreases. As a result of it, the stretched membrane on the surface of water is weakened and is not able to support the weight of needle. Hence the needle sinks in such water. The boiling point of water depends upon the pressure on its surface.

Steam produced inside the cooker builds up pressure thereby raising the boiling point of water, which results in quick cooking. The amount of heat latent heat possessed by steam is much greater than the amount of heat possessed by water at the same temperature.

Therefore, steam causes more severe burns 10 www. When salt is sprinkled over ice, some of it dissolves. As dissolution of the salt is accompanied by absorption oh heat. The temperature of the system falls below 0 degree Celsius. Hence, ice does not melt readily. The equal and opposite reaction force pushes the fireman backwards with a great speed satisfying the law of conservation of momentum. As a result, it is difficult for the fireman to hold the hose. There is no air in space and hence, sound waves cannot travel.

However, radio waves can travel through space. The astronauts can see each other because light, like radio waves, can travel through vacuum. From the pattern of reflections, a computer can build up an image of the internal structure which is vital for diagnosis.

Therefore, flash of lightning is seen before the sound of thunder is heard. Also, dolphins can avoid fishing nets and can detect fish at night.

Explain Ans: Bats emit high frequency 1, 20, Hz sound waves and listen with their sensitive ears for any echoes. From the time taken to hear the echo and from the nature of sound received. Bats are able to estimate the distance and the type of surroundings. This process is known as echolocation. Same process is used by the dolphins.Plastics 24 Because the distance remains the same.

The climbers are mostly parasites and they cannot manufacture their food.

CSS Everyday Science MCQS Book

Epithelial Cell 68 Ans: the velocity of light is much greater than that of the sound. Convex mirrors are used in automobiles because they form erect and diminished images of the object. Ans: i Molecules of oil are not bigger than that of water and therefore do not mix easily. What will be the load experienced by him. The rotation of the earth on its axis produces a centrifugal force which increases its equatorial diameter.

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