General Physics Questions And Answers


Q1. 
What will be the color of the sky in the absence of the atmosphere?

Ans.
Dark


Q2. 
On what factor does the normal shift through a refracting medium depend?

Ans.
The thickness of the refracting medium


Q3. 
A lens immersed in a transparent liquid is not visible. Under what condition can this happen?

Ans.
Same refractive index


Q4. 
What is the cause of the blue color of the ocean?

Ans.
Scattering of light by water molecules


Q5. 
A concave mirror is held in water. What should be the change in the focal length of the mirror?

Ans.
Remains the same


Q6. 
What happens to the interference pattern if the phase difference between the two sources varies continuously?

Ans.
Disappears


Q7. 
Two independent light sources act as coherent sources’.

Ans.
False


Q8. 
What will be the effect on the fringes formed in Young’s double-slit experiment if the apparatus is immersed in water?

Ans.
Decreases


Q9. 
In Young’s double-slit experiment if the distance between two slits is halved and distance between the slits and the screen is doubled, then what will be the effect on fringe width?

Ans.
Increases four times


Q10. 
If the separation between the two slits is decreased in Young’s double-slit experiment keeping the screen position fixed, what will happen to the width of the fringe?

Ans.
Increases