light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

Question : 11 [UP (Pre) 2015]

The minimum height of mirror required to see whole stand up image of a man of height 1.50 metre shall be

a) 1.50 metre

b) 1.00 metre

c) 0.75 metre

d) 3.00 metre

Question : 12 [NDA]

Which one among the following statements is not correct?

a) In air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode

b) In progressive waves, the amplitude may be constant and neighbouring points are out of phase with each other

c) Transverse wave can be polarised while longitudinal wave cannot be polarised

d) Longitudinal wave can be polarised while transverse wave cnanot be polarized

Question : 13 [IAS Prelim]

Assertion (A) :
The boiling point of water decreases as the altitude increases.
Reason (R) :
The atmospheric pressure increases with altitude.

a) Both A and R are true but R is not a correct explanation of A

b) Both A and R are true and R is the correct explanation of A

c) A is true but R is false

d) A is false but R is true

Question : 14 [IAS (Pre) 1994]

What is the reason behind the extraordinary shining of the diamond cuts in a proper way?

a) Because it is so hard

b) Because it has a higher refractive index

c) Because it has a higher transparency

d) Because it has a fixed deviation floors

Question : 15 [IAS (Pre) 2000]

Rainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this?

1. Dispersion
2. Refraction
3. Internal reflection

a) 1 and 3

b) 2 and 3

c) 1 and 2

d) All of the above