Physics Gurukul
Class 12 Physics Important Questions on Electromagnetic Waves
Class 12 Physics Electromagnetic Waves Work Sheet – I ONE MARKS QUESTIONS 1. Write the expression for the displacement current? 2. The charging current for capacitor is 0.5 A. What is the displacement current across its plate? 3. Write an expression for the speed of e.m. waves in free space. 4. For an electromagnetic wave, … Read more
UNIT –III- MAGNETIC EFFECTS OF CURRENTS & MAGNETISM
CLASS 12 UNIT-III MAGNETIC EFFECTS OF CURRENTS & MAGNETISM Formula Assignment Level-1 Assignment Level-2 Assignment Level-3
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Sound
Sound (i) The sensation felt by our ears is called sound. (ii) Sound is a form of energy which makes us hear. (iii) Law of conservation of energy is also applicable to sound. (iv) Sound travels in form of wave. Production of Sound Sound is produced when object vibrates or sound is produced by vibrating … Read more
Work & Energy
Work For doing work, energy is required. • In animals, energy is supplied by food they eat. • In machine, energy is supplied by fuel. Not much work inspite of working hard : Reading, writing, drawing, thinking, analysing are all energy consuming. But in scientific manner, no work is done in above … Read more
Sound (SA)
Short Answer Type Questions-I (2 Marks) 1. Three persons, A, B and C are made to hear a sound travelling through different mediums as given below : Persons Mediums A Iron Rod B Air C Water Who will hear the sound first? Why? [2011 (T-II)] 2. (i) Define the time period of a wave. (ii) … Read more
Sound (VSA)
Very Short Answer Type Questions (1 Mark) 1. What is reverberation? [2011 (T-II)] 2. Name the disease that can be caused by UV rays. [2011 (T-II)] 3. If 20 waves are produced per second, what is the frequency in hertz? [2011 (T-II)] OTHER IMPORTANT QUESTIONS 1. What do you understand by the term wave motion? … Read more
Important Short Notes (Sound)
Sound Important Notes 1. Sound is a mechanical energy which produces sensation of hearing. 2. For hearing sound there must be (i) a vibrating body, … Read more
Important Short Notes
Work & Energy Important Notes 1. Work: Work is said to be done, when a force causes displacement in its own direction. 2. No work is done, if the displacement is not in the direction … Read more
Work & Energy (LA)
1. Define work, energy and power. Give the SI units for each of the these quantities. A man whose mass is 80 kg climbs up 30 steps of the stairs in 30 s. If each step is 12.5 cm in height, calculate the power used in climbing the stairs, (g = 10 m/s2). [2011 (T-II)] … Read more
Work & Energy (SA)
Short Answer Type Questions-I (2 Marks) 1. The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on … Read more
Work & Energy (VSA)
1. Seema tried to push a heavy rock of 100 kg for 200 s but could not move it. Find the work done by Seema at the end of 200 s. [2017 (T-II)] 2. At what speed a body of mass 1 kg will have a kinetic energy of 1 J? [2011 (T-II)] 3. Define … Read more
Class 9 Science Thrust & Pressure (Questions from board papers)
Thrust & Pressure Questions from board papers Science Chapter- 10 (Part-2) Thrust & Pressure (Questions from Board Papers) Very Short Answer Type Questions: Question 1: How is pressure related to thrust? Answer 1: Pressure = Total thrust / Total surface area Question 2: Name the SI unit of pressure. Answer 2: Pascal (Pa) [ 1 Pa = … Read more
Ch-07 System of Particles & Rotational Motion
Centre of Mass Assignment-1 Rotational Motion Assignment-2 … Read more
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Best Way to Approach Physics Numericals
Physics is an interesting subject, the presence of problems makes it more. Don’t think any problems to be tough. Don’t be like, yeh problem to bilkul nai hoga mujhse. Rather face the problem. Positive attitude towards problem solving in physics is mandatory. Make sure you understand the concepts clearly. It is an important part in physics. While solving problems,first read … Read more
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Protected: NEET TEST
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Protected: NEET TEST
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Protected: NEET TEST
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