(A) Recording a permanent, sharp two dimensional black and white or multi colour photograph.
(B) Recording a permanent three dimensional multi colour photograph.
(C) Recording a permanent three dimensional black and white photograph.
(D) Recording a permanent three dimensional photograph of a given single colour or a multi colour.
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is?
(A) Of higher pitch when train arrives
(B) Of higher intensity when train arrives
(C) The same in both cases in all respects
(D) Of higher pitch when train departs
Snow on the mountains does not melt all at once when it is heated by the sun because?
(A) It has a low specific heat capacity
(B) It has a high latent heat of fusion
(C) It becomes very hard
(D) It reflects most of the heat from the sun
Two waves each of amplitude 1.5mm and frequency 10Hz are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is?
(A) 1.0
(B) 1.2
(C) 1.5
(D) 2.0
Optic fibres are used in?
(A) X-Ray photos
(B) CAT Scans
(C) Ultrasound Scans
(D) Endoscopy
A circular plate, a cube and a sphere, all made up of same material and having the same mass are heated to 3000C and left in a room. Which of them will have the slowest rate of cooling?
(A) Sphere
(B) Cube
(C) Circular plate
(D) All of the above
A boat will submerge when it displaces water equal to its own?
(A) Surface area
(B) Weight
(C) Density
(D) Volume
Splitting of different colours of light in a prism is?
(A) Dispersion of light
(B) Reflection of light
(C) Diffraction of light
(D) Refraction of light