The core of a transformer is laminated to reduce energy losses due to__________?

Related Mcqs:

1. The co efficient of linear expansion is equal to__________?

   A. ΔL = αLΔT
   B. ΔL/LΔT
   C. LΔT/ΔL
   D. αLΔT-ΔL

   Submitted by: Mahrukh

2. Mach is the unit of measurement in stating the speed of a moving object in relation to__________?

   A. The speed of sound
   B. The speed of other object
   C. The speed of light
   D. The speed of air resistance

   Submitted by: Ghusharib Ur Rehman

3. Geothermal energy is a _______________________ source of energy?

   A. non-renewable
   B. stable
   C. renewable
   D. none of the above

4. ________________ cells converts solar energy into electrical energy?

   A. rotory
   B. photovoltaic
   C. galvanic
   D. non of these

5. In normal state of energy the incident high energy photons will be______________?

   A. Stimulated
   B. Absorbed
   C. Cause X-ray emission
   D. Cause laser production

6. Which one of the following material is most suitable for making core of an electromagnet ?

   A. air
   B. steel
   C. Cu-Ni alloy
   D. soft iron

7. In multimode step index fibre the refractive index of core and cladding is____________?

   A. same
   B. different
   C. zero
   D. different with refractive index of core higher than cladding

8. To reduce the uncertainty in the timing experiment______________?

   A. Highly precise instrument
   B. Conduct at room temperature
   C. Count number of vibration
   D. Both a and C

9. A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?

   A. 0.025J
   B. 0.50J
   C. 0.75J
   D. 0.100J

10. The system which can exchange matter as well as energy with its surroundings is called____________?

    A. open system
    B. Closed system
    C. Isolated system
    D. Inert system

    Submitted by: Aneela shabbir