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Physics Awareness Questions for Competitive exams
What Is Physics?
- Most people hear the word ‘physics’ and run for cover. But it’s not just for rocket scientists! You are surrounded by physics all the time, and whether you realize it or not, you use physics every day. Physics, the study of matter and energy, is an ancient and broad field of science.
- The word ‘physics’ comes from the Greek ‘knowledge of nature,’ and in general, the field aims to analyze and understand the natural phenomena of the universe.
- Physics is a broad and complex field. It covers everything from sound and light to nuclear science and geology. Because of this, it’s been divided into different branches so that scientists can specialize in their knowledge of physics.
Newtons laws of Motion
Newtons First law of motion.
Newton’s first law of motion states that an object at rest remains at rest and an object in motion remains in motion with the same velocity unless acted upon by what we call an unbalanced force
Newtons Second law of motion.
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
Newton’s third law of motion.
For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.
What is Vector
Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity’s magnitude.
Although a vector has magnitude and direction, it does not have the position.
That is, as long as its length is not changed, a vector is not altered if it is displaced parallel to itself.
What is Scalar
A scalar or scalar quantity in physics is a physical quantity that can be described by a single element of a number field such as a real number. A scalar is usually said to be a physical quantity that only has magnitude and no other characteristic.
This is in contrast to vectors, tensors, etc. which are described by several numbers that characterize their magnitude, direction, and so on. The concept of a scalar in physics is essentially the same as in mathematics.
Physics Awareness Questions – GK Questions
The instrument is used to measure altitudes in aircraft’s is Altimeter.
Wattmeter is the instrument is used to measure the power of the electric circuit.
Nuclear sizes are expressed in a unit name known as Fermi.
A light-year is a unit of distance.
Light from the Sun reaches us in 8 minutes.
To measure heat radiation we use the instrument name Radio micrometre.
Pure water freezes at 32 F temperature.
Rocket works on the Angular momentum conservation laws.
Aviation fuel for Jet aeroplanes consists of purified Kerosene.
In Cosmic rays, we can find Mesons.
The wavelength of X-rays is of the order of 1 Angstrom.
A red object, when seen through a thick glass, appears as Black.
Human Body is a good conductor of electricity.
The Central Arid Zone Research Institute is located in Jodhpur.
Radium is the rare element that will associate with Marie and Pierre Curie.
Sir Alexander Fleming discovered Penicillin.
Optical fibres are mainly used for communication.
Leo Hendrik Baekeland made an invention to Bakelite.
Rocket Engine works on the Principle of Newton’s third law of motion.
Methane is the main component of Biogas and Natural gas.
Moment of inertia is known as Tensor.
Sound waves in air are longitudinal.
Magnetism at the centre of a bar magnet us Zero.
Lux is the SI Unit of Intensity of illumination.
Due to interference, on a rainy day small oil films on water show brilliant colours.
Materials for rain-proof coats and tents owe their water-proof properties to surface tension.
The sound of frequency below 20 Hz is known as infrasonic.
In steel, sound travels at the fastest speed.
General Science (Physics Awareness) Questions and Answers.
Light travels at the fastest Speed in the vacuum.
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit visible light.
Optical fibre works on the total internal reflection.
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in 4.2 years.
Supersonic plane fly with the speed greater than the speed of sound.
Mach number is used in connection with the speed of aircraft.
Radiocarbon dating technique is used to estimate the age of fossils.
Natural radioactivity was discovered by Henri Becquerel.
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