Light reaches the earth form sun in nearly____________________?

Related Mcqs:

1. According to Einstein light travels form one place to another in the form of ________________?

   A. waves
   B. particles
   C. photons
   D. it was not his discovery

2. In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?

   A. Becomes double
   B. Remains same
   C. Becomes half
   D. First increases then decrease because of the curvilinear graph

3. How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit) ?

   A. 365 days
   B. 730 days
   C. 329 days
   D. 129 days

4. A light ray traveling form rarer to denser medium suffers a phase change of__________________?

   A. 60°
   B. 90°
   C. 180°
   D. 45°

5. The escape velocity form the earth surface in km S-1 is____________________?

   A. 4.2 km S-1
   B. 7.5 km S-1
   C. 9.5 km S-1
   D. 1.1 km S-1

6. Gravitation force of sun is__________?

   A. 274 m/s²
   B. 362 m/s²
   C. 300 m/s²
   D. None  of these

   Submitted by: Adeeba Bashir

7. Which one of the following properties of light does not change with the nature of the medium ?

   A. velocity
   B. wavelength
   C. amplitude
   D. frequency

8. In Young double slit experiment, if white light is used____________________?

   A. alternate dark and bright fringes will be seen
   B. coloured fringes will be seen
   C. no interference fringes will be seen
   D. impossible to predict

9. In monochromatic red light a blue book will probably appear to be_________________?

   A. black
   B. purple
   C. green
   D. no scientific reasoning available

10. Which experiment shows that wavelength of light is smaller than that of sound___________________?

    A. Diffraction
    B. Polarization
    C. Interference
    D. Reflection