CBSE Class X Guess Questions: Science (Magnetic Effect)


  1. State the rule to determine the direction of a                      a) Magnetic field produced around a conductor carrying current.                                                              b) The force experienced by current carrying straight conductor placed in a magnetic field perpendicular to it. 
  2. c) Current induced in a coil due to its rotation in a magnetic field.
  3. From the following statement write down that which is applicable to a commutator.                                                    a) galvanometer uses commutator for deadbeat                        b) transformer uses commutator to step up voltage  c) motot uses commutator to reverse the current 
  4. What is short circuit? When does an electric short circuit occur? 
  5. How can it be shown that a magnetic field exists around a wire through which current is passing? 
  6. What will be the frequency of an alternating current if its direction changes after every 0.01 s? 
  7. The given figure shows a solenoid wound around an iron core. Will the end A be a North Pole, when the current flows through it in the given direction? 
  8. How does a solenoid behave like magnet? Can you determine the North pole and the South pole of a current carrying solenoid with the help of a bar magnet? Explain. 
  9. Write the principles on which the electric motor and DC generator works. 
  10. What were the observations made by Oersted in his experiment? State the rule which you use to find the direction of induced current. 
  11. What constitutes the field of a magnet? How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire increases? 
  12. Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason. 
  13. What is the function of an earth wire? Why is it necessary to earth metallic appliances? 
  14. Name three colours used and names of the wires used in household wiring. 
  15. a. Why does a compass needle get deflected when brought near a current carrying conductor? b. A rectangular coil of copper wire is rotated in a magnetic field. After what revolutions does the direction of induced current change? 
  16. The diagram alongside shows two ways of connecting three bulbs A, B and C to 220 V main in a room. Name the two arrangements. Which of them would you prefer for household electricity? Give two reasons. 
  17. What is overloading of domestic electric circuit? What precautions should be taken to avoid such overloading? 
  18. Write the properties of the magnetic field lines. Why don’t two magnetic field lines intersect each other? List three sources of magnetic filed. 
  19. A positively charged particle (a particle) projected towards north is deflected towards west by a magnetic field. Find the direction of magnetic field. 
  20. Write the direction of magnetic field at a given point on a current carrying conductor? How can it be represented graphically? 
  21. At what place of a magnetic field are the magnetic field lines denser? What is direction of magnetic field lines inside a magnet? 
  22. Explain the function of commutator and the brushes used in an electric motor. Name some devices in which electric motors are used. 
  23. What is an electromagnet? List any of its two uses. Draw a labeled diagram to show how an electromagnet is made. What is the purpose of the soft iron core used in making an electromagnet?
Numerical:
1. The mains power supply of a house is through a 5-A fuse. How many 100-W bulbs can be used in
this house at the correct voltage?
2. A wire 10 cm long and carrying a current of 1.5 A is held in a uniform magnetic field in which B=10-
3 T. Calculate the force on the wire if it is held perpendicular to the lines of the magnetic field.
3. A current of 10 A flows in a circular coil of 1000 turns and radius 0.1 m. Find the magnitude of the
magnetic field at the centre of the coil.
4. At what distance from a straight conductor carrying a current of 2.8 A, will the magnetic induction
be 2.8×10-5 T?
5. Find the strength of the current which will produce a magnetic field of 10-4 T at the centre of a coil
of mean radius 0.10 m. The coil comprises 20 turns.
6. A 0.4 m wire, stretched horizontally, carries an electric current of 15 A from East to West, in a
magnetic field whose magnetic field intensity is 0.1 N/Am, directed vertically downwards. What is (a)
the magnitude of the magnetic deflecting force on the wire, and (b) its direction?

    Comments

    Post a Comment

    Popular Post

    Obtaining and Utilization Food Class 7 Science Solved question (Basic Science Questions answers)

    Image
    A. Answer these questions 1. Name the three life process help living being to procure energy from food? Answer: Three life processes that help living organisms to procure energy from food are: (i) Digestion (Nutrition) (ii) Respiration (iii) Transportation 2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph. Answer: Autotrophs are organisms that can prepare their own food. Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants. Cyanobacteria are also an example of autotroph. 3. Name three type of heterotrophic nutrition Answer: Three types of heterotrophic nutrition are: (i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition 4. What are enzymes? Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body ...
    Read more

    9th Atoms and Molecules Question bank By KV For CBSE Board

    CHAPTER - 3 “Atoms and Molecules” 1. Laws of Chemical Combination 2. John Dalton's Atomic Theory 3. Atoms, ions & Chemical Formula 4. Mole Concept 5. Molar Mass & Avogadro constant Download Test Paper with solution CBSE Study By Jsunil ********************************************************************************* 1 Mark Questions: 1. Who gave law of conservation of mass ? 2. What term is used to represent the mass of 1 mole molecules of a substance? 3. What name is given to the number 6.023 x 10 23 ? 4. What is molecular mass? 5. Give Latin names for sodium & mercury. 6. *How many atoms are there in exactly 12 g of carbon ? 7. Define mole. 8. Calculate formula unit mass of CaCl2. [ At. Mass : Ca = 40 u , Cl = 35.5 u ] 9. Name a diatomic gas. 10. How many atoms are present in H 2 SO 4 . ...
    Read more

    Class IX assignment Chapter: Sound

    9 th Chapter: sound –Guess Questions for practice 1. If you place some small blades on a drum, what will you observe when you beat this drum with a drum stick? Explain. 2. Describe an activity with a (a) metre scale (b) rubber band to show that only a vibrating body produces sound. 3. With the help of tuning fork demonstrate that sound is produced by a vibrating body. 4. What is vibrating in the following musical instruments producing by a musical sound? (a) Violin (b) drum (c) saxophone (d) flute (e) guitar (f) dholak (g) tabla (h) sitar 5. What is medium? What constitutes the medium? 6. Describe an activity to show sound travels faster through a solid medium than through a gaseous medium. 7. Describe an activity to show sound travels faster through a solid medium than through a liquid medium. 8. Describe the experiment to demonstrate that waves do not c...
    Read more

    Physics : Class X Chapter: ELECTRICITY Assignment 2012-13

    Image
    Sadhana Devi Vidyapith, Samastipur ASSIGNMENT -1, (2012-13) By JSUNIL   Sub. – Physics, Class - X   Chapter -ELECTRICITY One mark questions 1. Define the term “electric current”. 2. Define the term ‘resistivity’ of a material. 3. How is a Voltmeter connected in the circuit to measure the potential difference between two points? 4. You have two metallic wires of resistances 6 ohm and 3 ohm. How will you connect these wires to get the effective resistance of 2 ohm? 5. If the distance between two electric charges is doubled, how much will the force exerting between them change to? Two marks questions 6. State Ohm’s law. “The resistance of a conductor is 1Ω.” What is meant by this statement? 7. Why are coils of electric toaster made of an alloy rather than a pure metal? 8. Why is the series arrangement not used for domestic circuits? 9. A wire of resistivity ‘r’ is stretched to double its length. How does it affect the (a) resistance (b) resistivity? 10. Write tw...
    Read more

    Derivation of Lens and mirror formula X Reflection and Refraction of light

    Image
    MIRROR FORMULA The relation between object distance(u), image distance(v) and the focal length (f) of the mirror is known as MIRROR FORMULA. Consider a concave mirror MM' (of small aperture). An object AB of height h is placed on the left of the mirror beyond its center of curvature so that the image formed is real, inverted and diminished in size(height = h'). Here : Object distance = PB = -u Image distance = PB'= -v Focal length = PF = -f Radius of curvature = PC = -R As shown in Figure, Δ ABP ∼ Δ A'B'P. ∴ A'B'/AB = PB'/PB ∴ A'B'/AB = (-v)/(-u) ∴ A'B'/AB = v/u.............(I) Similarly, as shown in the figure, Δ ABC ∼ Δ A'B'C. ∴ A'B'/AB = CB'/CB ∴ A'B'/AB = (PC-PB')/(PB-PC)........[as CB'=(PC-PB') and CB=(PB-PC)] ∴ A'B'/AB = [-R - (-v)]/[-u - (-R)] ∴ A'B'/AB = (-R + v)/(-u + R)........(II) By (I) & (II), v/u = (-R + v)/(-u + R) ∴ -...
    Read more