Physics Extras

Hi Dear Friends

Here are some Extra Questions for Physics …. Try To Solve Them and This will help you Improve your grades

Thanks And Regards
Aditya Goel
For Opponent-Crushers


Q. 1. Draw the ray diagram for an object placed at 2F in front of convex mirror.
Q. 2. Explain the different types of energy that can be obtained from
oceans.
Q. 3. What is the principle used in motors and discuss the role of split rings in electric motors.
Q. 4. Magnification of object is –1 . What kind of spherical mirror is Used and what is position of the object.
Q. 5. Hydrogen has been used as rocket fuel. Is it cleaner than CNG? why or why not.
Q. 6. Explain the construction ,working ,advantages and disadvantages of using solar cooker with diagram.
Q. 7. How has the traditional use of wind and water energy been modified for our convenience.
Q. 8. Find the equivalent resistance between A and B and find current In 5 ohm resistance
Q. 9. Why dispersion of light is found in case of prism and not in glass Slab. From the diagram give the number that corresponds to color Of danger signal. Why only that color is used as danger signal.
Q. 10. A convex lens has focal length of 50 cm. What is its power ? An object is kept at distance of 75 cm from this lens. Where Is the image formed ? How does size of image compare with that of object ?
Q. 1. Name one main ore of aluminium.
Q. 2. Why carbon tetrachloride (CC14) does not conduct electricity?
Q. 3. Which group of elements was missing in Mendeleev's Periodic Table?
Q. 4. State one point of similarity between the human eye and the camera.
Q. 5. The path of a beam of light passing through a true solution is not visible. Why?
Q. 6. The elements A, B and C are present in the same period of Periodic Table. Their atomic radii are 172 pm; 106 pm and 136 pm, respectively. Arrange these elements in increasing order of their atomic number in the period.
Q. 7. What type of bond is present in water molecule? Explain the formation of bonds between hydrogen and Oxygen to form water molecule.
Q. 8. How many electrons are associated with (i) one coulomb of charge? (ii) The flow of current of 16 mA for 100 s? (Given: charge of electron = 1.6 x 1019 C)
Q. 9. Two 'set-ups' are shown below: What are we likely to observe if the (i) Magnet in set-up (A) is kept stationary within the coil? (if) Key in set-up (B) is just 'plugged-in’?
Q. 10. Draw the pattern of the field lines of the magnetic field produced by a current carrying

  • Straight wire
  • circular coil
  • solenoid

Q. 11. How many 440 Q resistors should be connected in parallel to draw a total current of 10 A on a 220 V line?
Q. 12. Discuss the reaction of sodium, magnesium, iron and gold with water.
Q. 13.Give an example of the reaction between a non-metal oxide and sodium hydroxide. Write the balanced chemical equation also.
Q. 14. The image, formed by a concave mirror, is observed to be

  • Virtual, erect and larger than the object.
  • Real, inverted and larger than the object.
  • Real, inverted and of the same size as the object.
  • Real, inverted and smaller than the object.

Where is the position of the object in each of these cases? Draw ray-diagrams to justify your choices
for cases (I) and (III). Or
A beam of white light is made to fall on the three set-ups shown here.What are we likely to observe in each of these three cases ? How can we understand the similarity in the observations of cases(I) and (III)?
Name the seven colours linked with the observation in case (II) for sunlight
Q. 15.

  • Write a reaction in which a gas is evolved.
  • What are oxidation-reduction reactions? Write the reaction of copper oxide with hydrogen and

identify the species which is reduced.

  • What is rancidity?

Or

  • How are chemical reactions classified? Describe the various types of reactions with the help of an

Q. 1. Name a device that helps to maintain the potential difference across a conductor
Q. 2. Why ammeter is connected in series whereas voltameter is connected in parallel through a circuit?
Q. 3. Name the material used as filament in heater and electric bulb.
Q. 4. The p.d. between the terminals of an electric heater is 60v when it draws a current of 4A from a source.What current will the heater draw if p.d is increased to 120v.
Q. 5. What are difference between resistivity and resistance?
Q. 6. If resistance of a device kept constant and p.d decreases to half , what will be effect on its current?
Q. 7. Why are coils of heating appliances are made of alloys rather than metals?
Q. 8. What is variable resistance?
Q. 9. Why rheostat is used?
Q. 10. R1 , R2 & R3 are three resisters connected in series . derive equivalent resistance for circuit. If value of two resistance are 10 ohm and 20ohm , and a current of 5A flow through circuit having p.d 12v , find value of third resistor if all 3 are connected in parallel
Q. 11. What are advantages of connecting electrical device in parallelwith the batteries instead of series?
Q. 12. State joule’ s law. An electric iron consumes energy at rate of 840w when heating is at maximum rate and 360 w when heating is at minimum.The voltage is 220v . what are the current and resistant in each case?
Q. 13. Why inert gas such as nitrogen , filled in electric filament?
Q. 14. What is fuse? What type of material should be used for it?Give the rating of fuse for a device marked as 1000w –220v.
Q. 15. What is commercial unit of electrical energy? Express it in joule.
Q. 16. For resistors of equal values are connected through p.d 220v and carry current of 5A . Find values of each resistors.
Q. 17. Why we should not connect a bulb and a heater in series ?
Q. 18. What is electric power? Give its SI unit.
Q. 19. Why aluminium and copper wires generally used for transmission of current?
Q. 20. Why high tension wires are used for long distance transmission?
Q. 21. Why does a compass needle get deflected when brought near bar magnet?
Q. 22. Define magnetic field lines . what is direction of magnetic field lines inside magnet?
Q. 23. How the relative strength of magnet is expressed?
Q. 24. What will be effect in deflection of needle if

  • Current in solenoid will be changed
  • Magnitude of current will increase.

Q. 25. If an electron enters in magnetic field from west direction , how will it deflect?
Q. 26. List the properties of magnetic field lines.
Q. 27. Why don’t two magnetic field intersect each other?
Q. 28. The magnetic field in a given region is uniform . Draw a diagram to represent it.
Q. 29. A alfa particle projected towards west is deflected towards north by a magnetic field.What is the direction of magnetic field?
Q. 30. What is MRI?
Q. 31. Name two organs inside our body where magnetic field produced?
Q. 32. What is electric motor? On which principle it work? Name two device in which it is used.
Q. 33. State Fleming left hand rule.
Q. 34. What is commutator?
Q. 35. What is armature? How electromagnet is more advantageous than a permanent magnet?
Q. 36. What is electro magnetic induction?
Q. 37. Give two ways to induce current in a coil
Q. 38. What are differences between AC & DC?
Q. 39. After what times AC changes its direction ? give frequency of current produced in india.
Q. 40. What is dynamo? On which principle it work?
Q. 41. What modification should do to get DC from AC generator?
Q. 42. What precaution should be taken to avoid the overloading of domestic circuits?
Q. 43. What is short circuits? When it occurs?
Q. 44. What is function of earth wire? Why it is necessary to earth a metallic appliance?
Q. 45. Give three methods of producing magnetic field.


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