Rapid Revision Physics: Competitive Exam 2025

Rapid Revision Physics: Competitive Exam 2025. Here are one-liner questions and answers relevant to all exams to include NTPC, SSC, CDSE, CPO, and even for Civil services

Physics

• If the mass of a person is 60 kg on the surface of earth then the same person’s mass on the surface of the moon will be           60kg
• Which units is used for measuring the amount of a substance     Mole
• Through which of the mediums can sound NOT travel          Vacuum
• The Theory of Relativity is associated with        Albert Einstein
• According to which law, at constant temperature, the volume of a gas is inversely proportional to pressure          Boyle’s Law
• What is the SI unit of force Newton
• Which branch of physics deals with properties of fluids at rest     Hydrostatics
• What is the other name of Newton’s first law of motion          Law of inertia
• The momentum of an object of mass ‘M’ moving with a velocity ‘v’ is given by         Mv
• Which of the two colours of spectrum forms the extremes                     Violet and Red
• What is the momentum of an object having mass of 14 kg and velocity 28 m/s –392 kg-m/s (p = mv)
• The three laws of motion were proposed by                Newton
• Which type of mirror is used by dentists to see large images of patient’s teeth- Concave mirror
• Which devices is used to measure the atmospheric pressure        Barometer
• The ability of the eye to focus on both, near and distant objects, by adjusting its focal length, is called the Accommodation of the eye
• Modern electrical generator works on principle of          Electromagnetic Induction
• Travellers in deserts often tend to have an optical illusion of a sheet of water where none actually exists. What is this called                Mirage
• Who invented the modern mercury thermometer with a standardised scale  Daniel Gabriel Fahrenheit
• The ability of medium to refract light is also expressed in terms of its              Optical density 
• The center of the reflecting surface of a spherical mirror is a point called                  Pole
• Who provided the basic theory about the nature of matter           John Dalton
• What is the SI unit of power of a lens called Dioptre
• Which British physicist was awarded the Nobel Prize in Physics in 1906 for his work on discovery of electrons? J J Thomson

• The persistence of sound in an auditorium is the result of repeated reflections of sound and is called Reverberation
• In 1752, which American scientist shows that lightning and the spark from your clothes are essentially the same phenomena Benjamin Franklin
• A voltmeter  is an instrument which can detect the presence of Potential difference
• The instrument used to measure current is called Ammeter
• Which is NOT generally the properties of non-metals Conductors
• Which instrument is used to show the direction of flow of current in a circuit –Galvanometer
• Which is used to detect cracks and flaws in metal blocks – Ultrasound
• Which sub-atomic particle was discovered by J Chadwick –Neutron
• The SI unit of sound was named in honour of which physicist –Heinrich Rudolf Hertz
• Who proposed the laws of planetary motion – Johannes Kepler
• Albert Einstein was awarded the Nobel Prize for Photoelectric effect in 1921.
• Name the British chemist who presented his atomic theory in 1808, on conservation of mass and law of definite proportions, which was a turning point in the study of matter –John Dalton
• What is the SI unit of resistance – Ohm
• A microphone converts – Sound energy into electrical energy
• The speed of sound Decreases as it passes from solid to gaseous medium.
• Which devices is used to convert alternating current into direct current Rectifier
• Automobiles are fitted with a device that shows the distance  travelled –Odometer
• Which units is used to measure the intensity of sound -Decibel
• Which instruments is used to measure wind speed –Anemometer
• We hear others speaking to us from adjacent rooms due to __Diffraction _of sound waves .
• Give me a place to stand and I will move the world . which famous scientist said these words – Archimedes
• What is measured in ‘joules’ –Energy
• The lens which is thin in the middle and thick at its periphery is called a – concave lens
• Rockets work on the principle of conservation of – Momentum
• A light-year is a unit of –Distance
• Which type of mirror is used by dentists to see large images of patient’s teeth-Concave mirror
• Which was discovered by Henri Becquerel –Radioactivity
• Which colour deviates the least when light passes through a prism –Red