The “Important 500 Questions Of Physics part-3” is an invaluable resource for students gearing up for upcoming exams due to its comprehensive coverage of essential physics topics. By presenting a curated set of 500 questions, this resource allows students to test their understanding and grasp of various concepts in physics. It serves as an effective tool for self-assessment and targeted revision, enabling students to identify their strengths and weaknesses. Additionally, practicing with these questions helps students familiarize themselves with the exam format and improve their problem-solving skills, ultimately enhancing their performance on exam day.
Important 500 Questions Of Physics part-3
- Who invented electronic computer – Dr. Alan M. Turing
- One horse power (HP) contains – 746 W
- How many meters are there in one angstrom – 10-10m
- The weight of one kilogram is – 8 newtons
- How many calories are in one joule – 24
- Occurs in one nano second – 10-9s
- One nanometer is equal to – 10-7cm
- One light year is closest to – 1015m
- What is the distance in one light year – 46 x 1012km
- How many meters are there in one micron – 10-6
- What is one micron equal to – 001mm
- The penetrating power of X-rays can be increased by increasing the potential difference between cathode and anode.
- The atomic number of carbon is 6 and atomic weight is 12. How many protons are there in its nucleus – 6
- The maximum number of electrons that can be in the second orbit of an atom of an element is – 8.
- What determines the chemical properties of an element – Number of electrons
- The chemical properties of an element depend on its atomic number.
- Block Hole theory was propounded by – S. Chandrashekhar
- Which electronic configuration is for metal element – 2, 8, 8, 2
- Which scientist was co-winner of the Nobel Prize with his sons – William Henry Bragg
- How will the height of a six feet tall person be expressed in nanometers – approximately183 x 107 nanometers
- When two electrons are in the same shell, what is found in them – anti-cycle
- Energy transformation takes place in dynamos – from mechanical energy to electrical energy.
- One barrel of oil is approximately equal to – 159 liters
- What is the purpose of thermostat – to keep the temperature constant
- With the help of which particles did Rutherford discover the nucleus – α-particles
- The electronic configuration of the atom with atomic number 20 is – 2, 8, 8, 2
- Who invented the first incandescent bulb – J. A. Fleming
- Photoelectric cell converts light energy into electrical energy.
- The discoverer of meson is – Yukawa
- Converts chemical energy into electrical energy – battery
- In the context of a molecule of a chemical element, the magnetic quantum number is related to – spin
- The device used to record and reproduce recorded dictation is called – Dictaphone.
- Rectifier is used to convert AC to DC.
- Cyclotron is a device which provides energy to charged particles.
- By studying the scattering of what from gold foil, Rutherford discovered the nucleus – α
- The substance formed after 1 ß (beta) emission from11Na22 is – Mg
- What is the number of protons in a negatively charged atom (anion) – less than the number of electrons in the atom
- Which scientist discovered gamma rays – Rutherford
- The atomic number of an element does not help in determining what – Number of neutrons present in the nucleus
- Which has negative charge – Gamma ray
- If the atomic number of an element is 35 and it has 18 electrons, then the number of protons in it will be – 18
- The most appropriate statement related to the atomic weight of an element is – Unlike the mass number, the atomic weight of an element can vary.
- If there are 2 protons, 2 neutrons and 2 electrons in the atom of an element, then what will be the mass number of that element – 4
- What are gamma rays – high energy rays emitted by radioactive substances
- The number of protons in element 92U235 is – 92
- The nature of elements can be known – through electronic configuration.
- To discover the nucleus, when Rutherford showered alpha (α) particles on a thin metal sheet, most of the alpha particles passed through the metal foil without any deflection.
- What is used to absorb neutrons to control the chain reaction during nuclear fission – Boron
- The mass number of the nucleus is always greater than its atomic number.
- The effective radius of an atom is – 10-10 m
- The number of electrons in an atom of atomic number Z and mass number A is – Z
- Beta (ß) rays are – from negatively charged particles.
- If the amount of a radioactive substance is doubled, the rate of radioactive decay remains unchanged.
- Which scientist first discovered radioactivity – Henri Becquerel
- Radioactive substances emit – alpha particles, beta particles, gamma particles
- Atomic number of sodium is 11 and atomic mass is 23. The numbers of electrons, neutrons and protons in this will be – 11, 12, 11 respectively.
- Stable nuclei (with light A<10) have approximately equal numbers of neutrons and protons.
- “Equal volumes of gases at the same temperature and pressure have the same number of molecules.” According to which rule is this – Avogadro’s hypothesis
- What kind of salt is H2CO3 – Acidic
- Solutions in test tubes filled with H2O and aqueous NaOH can be differentiated by – Red litmus
- pH value indicates whether a solution is acidic or alkaline.
- The very soft mineral ‘talc’ is mainly – magnesium silicate.
- Aqueous solution of ammonium chloride is – alkaline
- Molybdenum acts as a catalyst enhancer in the Haber process of ammonia production.
- What is the gaseous mixture of carbon monoxide and nitrogen gas called – Producer gas
- What is the pH level of blood of a normal person – 7.35-7.45
- Aqueous solution of copper sulphate is acidic in nature, because the salt undergoes – Hydrolysis
- Cupric chloride is used as a catalyst in the Decan method of making chlorine gas.
- What are present in the solution of common salt in water – positive ions of sodium and negative ions of chlorine
- Aqueous solution of which salt turns red litmus blue – Na2CO3 – positive ions of sodium and negative ions of chlorine
- The salts which remain free from acidic hydrogen atom or hydroxyl ion are called – normal salts.
- pH value of milk is – 6.6
- Absolute zero temperature is – theoretically the lowest possible temperature.
- The base used as counter acid is – Magnesium hydroxide
- What does ashes taste like – salty
- Although the amount of aluminum in the earth’s crust is greater than that of iron, yet aluminum is more expensive than iron because the metallurgical processes of producing aluminum are more expensive than those of iron.
- The role of a catalyst in a chemical reaction is to change activation energy.
- Salt which absorbs water is called – hygroscopic salt
- Those substances which provide heat by burning are called – fuel
- Platinum powder is used as a catalyst in the contact method of making sulfuric acid.
- From safety point of view, what is filled in G gas cylinder to make the gas deodorized – Mercapton
- By reducing the volume of a gas at constant temperature, its pressure increases.