General Physics Questions And Answers


Q1. 
Which basic oscillatory circuit is used these days to produce electromagnetic waves?

Ans.
LC oscillatory circuit


Q2. 
Is the ratio of frequencies of UV rays and IR rays in the glass more than, less than or equal to 1?

Ans.
More than 1


Q3. 
Microwaves can’t be used for long-distance transmission of signals.

Ans.
False


Q4. 
If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons?

Ans.
Halved


Q5. 
A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from.

Ans.
Myopia


Q6. 
According to the thin lens formula, which one of the following is true regarding the focal length of the lens?

Ans.
f is negative for concave lens


Q7. 
What is the SI unit of power of a lens?

Ans.
Diopter


Q8. 
The power of a convex lens is negative.

Ans.
False


Q9. 
What causes haloes (rings) around the sun or the moon?

Ans.
Reflection of light


Q10. 
Why is the sequence of colors in the secondary rainbow reverse of that in the primary rainbow?

Ans.
Two internal reflection