Question

Assertion  :  The cloud in sky generally appear to be whitish.

Reason      : Diffraction due to cloud is efficient in equal measure at all wavelengths.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Answer

(c) If assertion is true but reason is false.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The condensers of capacity  and  are connected in parallel, then the equivalent capacitance is

(a)  

(b)  

(c)  

(d)  

It is essential to consider light as a stream of photons to explain:
In a semiconductor:
  1. There are no free electrons at 0K.
  2. There are no free electrons at any temperature.
  3. The number of free electrons increases with temperature.
  4. The number of free electrons is less than that in a conductor.

Long distance short-wave radio broadcasting uses

(a) Ground wave

(b) Ionospheric wave

(c) Direct wave

(d) Sky wave

An electron is travelling horizontally towards east. A magnetic field in vertically downward direction exerts a force on the electron along

(a) East   

(b) West

(c) North

(d) South

The length of the wire is doubled. Its conductance will be

(a) Unchanged

(b) Halved

(c) Quadrupled

(d) 1/4 of the original value

A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at

(a) 0° to the direction of the field

(b) 45 ° to the direction of the field

(c)  90° to the direction of the field

(d) 135° to the direction of the field

Two photons having:
  1. Equal wavelengths have equal linear momenta.
  2. Equal energies have equal linear momenta.
  3. Equal frequencies have equal linear momenta.
  4. Equal linear momenta have equal wavelengths.

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is

(a) 3   m/s

(b) 1.5  m/s

(c) 6  m/s

(d)  m/s

The material of permanent magnet has

(a) High retentivity, low coercivity

(b) Low retentivity, high coercivity

(c) Low retentivity, low coercivity

(d) High retentivity, high coercivity