PHYSICS QUESTION FOR 10 TH CLASS 2009-10

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PHYSICS QUESTION FOR 10 TH CLASS 2009-10

PAPER SET-2

  1. A lens has a power 4D. What is its focal length and nature.  2
  2. Make a diagram to show how hypermetropia is corrected? 3
  3. Why does sky appears blue? 3
  4. How can we connect three resistances 6ohm each to obtain 12ohm net resistance
  5. A wire of resistance 20W is drawn out so that its length is increased to twice its original length. Determine the new resistance.3
  6. A potential difference of 200V is maintained across the ends of a wire having resistance 100 ohm. Calculate the number of electrons passing through it in one second. Charge on one electron is 1.6x10-19 C .3
  7. Metal M is found in nature as its carbonate MCO3 .It is used in the galvanization of iron articles. Identify the metal M and name its ore MCO3.How will you convert this ore into free metal? Explain with equations. 3
  8.     A concave mirror produces a magnification of ½ when an object is placed at 60cm from it. Where should the object be placed so that a virtual image of double of the size is formed?
  9. A 25W and 100W bulbs are joined in series and connected to the mains. Which bulb will glow brighter and why?3
  10. A concave mirror of focal length 10cm is placed at a distance of 35cm from the wall. How far from the wall an object be placed so that the image is formed by the mirror at the wall?3
  11. Explain the  working of fuse wire in a circuit.3
  12. Why Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG?3
  13. Why is bio gas a better fuel than animal dung cakes.  3 When the current in a wire moves from south to north, the direction of the deflection in the magnetic needle parallel to the wire will be:

  14. (a) East to west (b) West to east(c) East to north(d) West to south

  15. Mark (1) Q 7 Negative value of focal length of a spherical mirror indicates that it is

  16. (a) Concave mirror(b) Convex mirror(c) Plane mirror(d) Convex mirror of small focal length

  17. Mark (1Q 8 Refraction of light can take place at the boundary of

  18. (a) Transparent media(b) Opaque media(c) Any medium(d) Rarer mediumMark (1)

  20. Q 9 The three R’s referred to in context to save environment are:

  21. (a) Reduce, Recycle and Reuse(b) Refuse, Reduce and Reuse
    (c) Remain, Relent and Repent(d) Reinforce, Repair and Render

  22. Mark (1) An electric  geyser  has  the  ratings  2000 W, 220 V  marked  on it. What should be the minimum rating,in whole number of a fuse wire,that may be required for safe use with this geyser  

  23. Differentiate  between  the  short circuiting  & overloading  of  electrical circuits. How does a fuse protects an electrical circuit ?                                                                 2
  24. Draw the pattern of  magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside solenoid  indicate ? Write one application of magnetic field of current carrying solenoid.                                                                                      2
  25. A coil  of  insulated  copper wire  is connected to the  galvanometer. What will happen if a bar magnet :

  26.      (a) pushed into the coil  

  27.      (b) withdrawn from inside the coil 

  28.      (c)  held stationary inside the coil.                                                                            3

  29.  

  30. Two  compounds  ‘A’  and ‘B’ have the same molecular formula C4H8O2. Compound  ‘A’  is  an acid  and  compound ‘B’ has a  fruity  smell.  Suggest  (i) chemical formulae and  (ii) the  structural  formulae of  compounds  A  and B. Name  the  functional  group  of  compound B.What  name  would  you  give to the relationship between the compounds A and B.                                                                                                                    3

  31.  

  32. (a) Two lenses have power of (i)+2D and (ii)- 4D.What is the nature and focal length of

  33.                 each lens ?

  34.           (b) An  object is  kept at a distance of 100cm from each of above lenses. Calculate the 

  35.                 (i) image distance (ii) magnification in each of the two cases.                               3

  36.  

  37. n  a  household electric circuit different  appliances  are  connected in parallel to one another. Give two reasons.

  38.           An electrician puts a  fuse  of  rating  5A  in  that  part of domestic electrical circuit in

  39.           which an electrical  heater of rating 1.5 kW, 220V is operating.What is likely to happen  

  40.           in this case and why ? What change, if any, needs to be made ?                                   5

  41.                                                                Or

  42. You are given following current-time graphs from two different sources:

  43. (i) Name the type of current in two cases.  

  44. (ii)Identify any one source for each type of these currents.

  45. (iii)What is the frequency of current in case II in India ?

  46. (iv)Use above graphs to write two difference between the current in two cases.

  47. 4      What do you mean by angle of deviation of a triangular glass prism ?               1

  48.                                                                                                          

  49. 5      A person uses spectacles of power +2D.What is the defect of vision he is suffering from ?                                                                                                    1

  50.                                                                                             

  51. 6      What is S.I and commercial units of electrical energy ?                                  1

  52.                                  

  53. 7      How  can  three  resistors   of  2, 3  and 6  ohms  be connected  to  give  a    total resistance of  a) 4 ohms  b) 1 ohm                                                           2

  54.  

  55. The current bill for  a  month  of  30 days is  Rs 90.  If  the rate is Rs 3 per kilowatt hour for 5 identical bulbs lighted 5 hours daily. What should be  the power of each bulb.                                                          

  56. 12   An object placed 50cm from a lens produces a virtual image at a distance of 10 cm                                                                  

  57.      infront  of the  lens. Calculate  the focal  length of the lens and draw a diagram to  

  58.      show the formation of the image.   3                                                                                                                                                                                                                     

  59. What is meant by term scattering of light? Describe the arrangement for observing scattering of light by colloidal solution.             

  60.                                                                 

  61.  16 a)  How  can  we  induce current in a coil and when the induced current is found to       

  62.           be the highest

  63.       b) Give  an  experiment  to  demonstrate  the  force  acting  on  current    carrying

  64.           conductor placed in a magnetic field.                                                     2+3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

  65.  a) A  copper  wire has a  diameter of 0.5 mm and  a resistivity of 1.6 ohm cm. how

  66.           much of this wire would be required to make a 10 ohm coil.

  67.      b) State  the Joule’s  law  of  heating .  Explain  any  two practical  applications of

  68.           heating effect of electric current  
  69.  Find the work done by an electron to maintain the potential difference of 80V?

  70.  

  71. What is the potential difference between the ends of 16Ω resistance, when a current of 1.5A flows through it?

  72.  

  73. The potential difference across the the terminals of an electric iron is 240V and the current is 6 A what is the resistance of electric iron?

  74.  If there are 108 electrons flowing across any cross section of a wire in 4 minutes, what is the current in the wire?

  75.  A copper wire has diameter o.5mm and resistivity 1.6 x 10-8 ohm m what will be the length of this wire to make the resistance of 10 ohms?

  76.  Find the effective resistance of resistors 0.01 ohms and 107 ohms.in series and parallel

     

  77.  Two resistors of same materials has been connected in series first and then in parallel. Draw a V – I graph  to distinguish  these connection.

  78.  Three resistors 3,4,5 ohms are joined in parallel in a circuit. If a current of 150 mA flows through the resistor of 4 ohms, then find the values of the current in mA which will be flowing in other two resistors?

  79.  A wire of length 2cm having resistance R  is stretched  to have an increase of 100% of original length . Find its new resistance with respect to its original resistance.

  80.  An electric lamp has resistance of 400 ohms. It is connected to a supply of 250V. If the price of electric energy is Rs.1.20 per unit, calculate the cost of lighting the lamp for 20 hours.

  81.  

  82. PAPER SET-13

  83.  

  84. Subject – Physic     Why magnetic field lines do not intersect each other.                                             (1)

  85. 2.      What happens to the image distance in the eye when we increase the distance of an object from the eye?                                                                                                         (1)

  86. 3.      What is the magnitude of the induced current in the circular loop ABCD of radius r as shown in figure below, if the straight wire AB causes a current of magnitude I ampere?                                                                                                                                                (1)

  87.     Two wires X and Y of the same metal have the same area of cross-section and have their lengths in the ratio 2:1. What will be the ratio of currents flowing through them when same potential difference is applied across length of each of the wire                                         (2)

  88. 5.      Why the sun’s disc appear circular during noon.                                                        (2)

  89. 6.      A resistance of 5Ω is connected in series with a parallel combination of a number of resistors each of 6 Ω. If the total resistances of the combination is 7Ω, how many resistors are in parallel?

  90. 7.      What is an electromagnet? Draw a diagram of electromagnet carrying current. State two ways by which the strength of an electromagnet can be increased.                                                 (3)

  91. 8.      A 3D lens forms a real image that is four fold the object placed perpendicularly on the principle axis of the lens. Find the distance of the object from the lens.                                 (3)

  92. 9.      (a)     State two main causes of the person-developing far sightedness with the help of a ray diagram. Suggest how he can helped to overcome this ability?

  93.           (b) The near point of a hypermetropic person is 80cm from the eye. What is the power of the lens required to enable him to read clearly a book held 25cm from the eye.                                                                                                           (5)

  94. 10.  State snell’s law of refraction of light? Draw a diagram to show the refraction through a rectangular glass slab? What is lateral displacement? The refractive index of diamond is 2.42 with respect to air. Calculate the velocity of light in diamond. Does the value of refractive index depend on the colour of light?

  95.                                        Or

  96.    (a)State Joule’s law of heating. Derive its expression.

  97.    (b)Two resistor ratios of 5Ω and 15Ω are connected first in series than in parallel combination. Calculate the ratio of heat energy generated in series and parallel combination if both the resistors are connected to the same battery of ‘V’ volts and for same time interval ‘t’.                                                        (5)

  98. 1.       A household uses (i) machine of rating 200W for 5 hour (ii) two fan at rating 80W for 6 hour (iii) 6 bulbs of 18W for 8 hours, each day. Find the electricity bill of one month if cost per unit is Rs.4.0.                                                                                                                 3                                                                                              

  99. 2.       (i) What do you understand by the term fuse in an electric circuit? 

  100.       (ii) State two properties of a material, which make it suitable for fuse wire.

  101.      (iii)Why fuse wire is always placed in the live wire of an electric circuit?

  102.      (iv)How does fuse wire protect an electric circuit?

  103.       (v)Two fuse wire A &B of the same length are rated 15A and 5 A. which amongst the A & B will be thicker & why?                                                                                                        5                                                                                       

  104. (i)A copper has a diameter 0.5 mm and resistivity1.6 x10-8 Wm. what will be the length of this wire to make a resistance of 10W. (ii) How much will the resistance change, if the diameter doubled?

  105. 1.A plane mirror, a concave mirror, and a convex mirror are given. How will you identify them by looking at your image?

    2.State the laws of refraction.

    3.Define power of a lens What is its S.I unit?

    4.Why the Sun is visible to us 2 minutes before Sunrise and 2minutes after Sunset?

    5.What is dispersion of light? Why does it occur?

    6.Draw the ray diagram and describe the size, position and nature of image formed by a concave mirror, when the object is placed between C and F .

    7.Define the following (i) power of accommodation of eye (ii) least distance of distinct vision.

    8.A person can see the near objects clearly but not the far objects. Identify the defect

    of the eye. Mention the causes. Explain its correction with a neat ray diagram.

    9. What is Hypermetropia? Explain its cause and correction with neat diagram.

     10. What is Presbyopia? Explain its cause and correction.

    11.Find the focal length of a concave mirror of radius of curvature 32cm.( f = 16 cm)

    12. Calculate the refractive index of glass if the velocity of light in glass is 2x 108m/s. Velocity of light in vacuum is 3x108m/s.( n = 1.5 )

    13 The refractive index of water is 4/3 and for glass it is 3/2 with respect to air. What is  the refractive index of glass with respect to water? ( n = 1.125 )

    14. An object of 5cm high is held 25cm away from a converging lens of focal length 10cm.Draw the ray diagram and find the position, size, and the nature of the image formed.

    15. An object is placed at a distance of 10cm in front of a convex mirror of radius of curvature 30cm.Find the position, size, nature of the image formed.

    16. Find the focal length of a concave lens of power –2.0D.

    17. Two thin lenses of power 3.5 D and –2.5D.are placed in contact. Find the power and focal length of the combination. What is the nature of the combined lens ?

    18. State Snell’s law of refraction of light.

    19.A transparent medium A floats on another transparent medium B. When a ray of light travels obliquely from A to B the refracted ray bends away from the normal. Which of the media A and B is optically denser and why?

    20.The radius of curvature of a convex mirror used on a moving automobile is 2m. A truck is coming behind it at a constant distance of 3.5m. Calculate(i) the position and (ii) the size of the image relative to the size of the truck.What will be the nature of the image .

    21. Draw a ray diagram to show the passage of two rays of light through a rectangular

    glass slab, when the angle of incidence is zero in one case and a little than 900in the other case.

    (b) Prove that if a ray enters a rectangular glass slab obliquely and emerges from

    the opposite face, the emergent ray wil be parallel to the incident ray.

    22. Where will the image be formed by a convex mirror if the object is placed between

    infinity and the pole of the mirror?

    23. In what S.I units is the power of lenses stated? A convex lens has a focal length of

    50cm. Calculate its power.

    24. Why does the sun appear reddish during sunrise and sunset ?

    25. An object 5 cm high is placed 20 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror, should a screen be placed to obtain a sharpimage? Calculate the size of the image formed.

     

    26 A concave mirror and a convex lens are held separately in water. What changes, ifany do you expect in the focal length of either?

    27 A convex mirror used on an automobile has a focal length of 3m. If a vehicle behind is at a distance of 5 m, find the location of the image.

    28 An object of size 4 cm is placed 25cm in front of a concave mirror of focal length 15cm. Find the position and nature of the image and the size of the image. 

    29 The stars appear to twinkle, but the planets do not Why?

    30 What is cataract ?

    31 Why does the sky appear blue?

    32 A convex mirror used on a bus has a focal length of 200 cm. If a scooter is located at 400 cm from this mirror, find the position , nature and magnification of the image formed in the mirror.

    33 An object 15 cm length is placed at a distance of 10 cm in front of a convex mirror of

    focal length 15 cm. Find the position, nature and size of the image formed.

    34 A concave lens has a focal length of 15 cm. At what distance should an object 10

    cm long be placed so that it forms an image at 10 cm from the lens? Find the nature

    and size of the image formed. 

    35 Name the four common defects of vision and state the cause of each defect. A

    person cannot see distinctly objects placed beyond 2 m. State the nature and focal

    length of the lens which could be used to correct this defect.

    36 An object is placed at 20 cm from a lens of focal length 10cm. The lens produces an

    erect and diminished image, Draw a ray diagram showing the image formation by

    the lens. Find the position of the image formed by the lens. 

    37 Is it necessary that an optically denser medium must have greater mass density?

    Give an example. 

    38 How does the size of an image changes when an object is moved away from a

    concave mirror?

    39 Explain, why the length of the day time increases by 4 minutes.

    40 Name the principles involved in the formation of rainbow.

     

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