An electric motor could be used as a: ___________?

Related Mcqs:

1. Production of heat due to an electric current flowing through a conductor is given by _________________?

   A. Joule effect
   B. Joule Thomsons effect
   C. Comptons effect
   D. Feed back effect

2. An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be______________?

   A. 12
   B. 24
   C. 5
   D. 1100

3. An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?

   A. E = BeV
   B. B = eE/V
   C. E = BV
   D. E = BeV/2

4. A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?

   A. 220V
   B. 220/ 2V
   C. 110V
   D. 220 √2V

5. In the electron microscope, electric & magnetic fields are used as_______________?

   A. Electromagnetic gun
   B. Source of electromagnetic waves
   C. Deflecting charged particle
   D. Converging source of electrons

6. The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?

   A. Ke2/rn
   B. Ke2/rn2
   C. ÀKe2/rn
   D. ÀKe2/rn2

7. Electric current in a solid metal conductor is caused by the movement of what ?

   A. Protons
   B. Electrons
   C. Metal atoms
   D. Metal ions

   Submitted by: Ahmed Khan

8. Which of the following are not deflected by electric and magnetic fields ?

   A. Alpha rays
   B. Beta rays
   C. Gamma rays
   D. None of these

   Submitted by: Aamir Balouch

9. A bird sitting on a high tension electric wire does not get electrocuted because:

   A. Sit has high resistance
   B. the body is earthed
   C. it does not form a closed path for the flow of current
   D. its feet are good insulators

   Submitted by: Abid Hussain

10. The back emf of a motor which is just started is_________?

    A. Zero
    B. Maximum
    C. Minimum
    D. Optimum

    Submitted by: Raza Baloch