physics-important questions and theirs answers

1. Under which category Magnetic, electrostatic and gravitational forces come? – Non-contact forces
2. No matter how far you stand from a mirror, your image appears erect, How is the mirror likely to be? – Either plane or convex
3. Due to which Phenomenon are advanced sunrise and delayed sunset found in the sky? – Refraction of sunlight
4. Due to which Phenomenon is the formation of colours in soap bubbles? – Interference of light
5. On which principle a pressure cooker works? – Elevation of boiling point of water by application of pressure
6. Why does pressure of a gas increases due to increase of its temperature? – Kinetic energies of die gas molecules are higher

7. By which Newton’s may the weight of an object be assigned? – Laws of gravitation
8. With which field is a current carrying conductor associated? – A magnetic field
9. On which the linear expansion of a solid rod is independent? – On its time of heat flow
10. Which doesn’t have any effect on velocity of sound? – Pressure
11. In which network, all devices are connected to a device called a’ hub and they communicate through it? – Star network
12. Why does white light into its components? – Due to dispersion
13. What type of lenses are used in movie projectors? – Convex
14. During which radioactivity radiation is not emitted? – Cathode rays
15. An object is undergoing a non-accelerated motion. What is Its rate of change in momentum? – Zero
16. A particle is moving freely. Then its– kinetic energy is always greater than zero
17. If an object undergoes a uniform circular motion, then What will be? – Its velocity changes
18. In howmany hours does geostationary satellite complete its one revolution around the earth? – 24 hours
19. MCB, which cuts off the electricity supply in case of short-circuiting, on which effect does it work? – Magnetic effect of current
20. A motor vehicle is moving in a circle with a uniform speed. Where will be the net acceleration of the vehicle? – towards the centre of circle
21. Which property of a proton may change while it moves freely in a magnetic field? – Velocity
22. During sunrise and sunset, why does sun appears reddish-orange? – Reddish-orange light is least scattered by the atmosphere
23. Why are ball bearings used in bicycles, cars, etc? – The effective area of contact between the wheel and axle is reduced
24. By which Singal a television channel is characterised? – Frequency of transmitted signal
25. What is a good conductor while carrying current? – Electrically neutral
26. What is the device used for measuring the wavelength of X-rays? – Bragg Spectrometer
27. Which is responsible for the working of Newton’s colour disc experiment? – Persistence of vision
28. Who is the founder, of quantum theory of radiation? – Plank
29. What is Photon? – The fundamental unit/quantum of Light
30. When does a  liquid disturbed by stirring cometo rest? – Due to Viscosity

chemistry-important questions and theirs answers


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