Physics in Daily Life — Part 3: 28 MCQs with Explanations

Short-sight defect could be corrected by a concave lens lens.

Sound cannot travel through Vaccum.

The speed of sound in air at sea level is approximately 340 meters per second .

Moon light reaches to earth in 1.3 seconds seconds.

The speed of light is 300,000 km/s .

The approximate intensity level of the sound which can cause damage to the ear drum is 100 dB.

UV light falls in the category of Ionizing Radiations .

The cracking sound heard when dry hair is combed with a hard rubber comb is due to Small electric sparks .

Red, green and blue is the correct answer to “Which one of the following sets of color combinations is added in color vision in TV’”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Iris is unable to dilate the pupil immediately is the correct answer to “When a person enters a dark room from bright light he is not able to see clearly for a little while because the”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

The rear view mirror of a motor vehicle is Convex .

Concave lens is the correct answer to “Myopia is a defect of Human eye. it can be corrected by using a lens called”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Lactometer is a type of Hydrometer which is used to measure the specific gravity of Milk .

Ultrasonic is the correct answer to “The principle used in radar is the same as that of Sonar. In radar we use radio waves; whereas in sonar we use”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

3 feet is the correct answer to “A six feet tall lady wants to see her full image in a plane mirror. The minimum length of the mirror will be”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

When a ray of sunlight enters a dark room, its straight path become visible because of dust particles hanging in the air. It is because light is Visible .

The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least 56 ft .

Water is heated in a kettlE. The inside water is heated by convection. A person sitting near the fire receives heat by Radiation .

Television signals are converted into light signals by Photo diode .

Ionosphere is the correct answer to “Which of the following layers make radio transmission possible”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Ionosphere is the correct answer to “Which of the following atmospheric layers help in radio communication”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

The phenomenon of Aurora Borealis, the display of red and green lights in northern hemisphere is due to radiations from Ionosphere .

Length is the correct answer to “A light year is a unit of”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

slow is the correct answer to “Clocks, which moves with the velocities comparable with the velocity of light, run”. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

When white light is passed through a prism, it splits into 7 colours.

Sound cannot travel through a vacuum is the correct answer to “Which from the following is true for “Sound””. Items of this type are drawn from the Physics in Daily Life — Part 3 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Sound waves are Longitudinal waves.

Long-sight defect could be corrected by using Convex lens.