AIIMS 2019 Physics Modern Physics Revision Quiz 2 for NEET & AIIMS Exams

Question 1

What will be the number of photons emitted per second by a 10 W sodium vapour lamp assuming that 90% of the consumed energy is converted into light [Wavelength of sodium light is 590 nm, and h = 6.63×10^-34 J –s]

Question 2

Direction: Each of these questions contains two statements. Assertion and Reason Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion (A): To increase resolving power of a telescope, the aperture (α) of the objective should be large.
Reason (R): Resolving power of the telescope is given by

.

Question 3

Direction: In each of the following questions, a Statement of assertion is given followed by a corresponding Statement of reason.

Assertion (A) The phenomenon of X-ray production is basically inverse of the photoelectric effect.
Reason (R) X-rays are electromagnetic waves.

Question 4

Direction: In each of the following questions, a Statement of assertion is given followed by a corresponding Statement of reason.

Assertion (A) Critical angle of light passing from glass to air is minimum for violet colour.
Reason (R) The wavelength of violet light is greater than the light of other colurs.

Question 5

A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Calculate, the minimum time after which it would be possible to work safely with this source.

Question 6

Direction: In each of the Following questions, two statements are given. One is assertion and the other is reason. Examine the statement carefully and mark the correct answer according to the instruction given below

Assertion In a stationary wave, there is no transfer of energy.
Reason There is no outward motion of the disturbance from one particle to adjoining particle in a stationary wave.

Question 7

Direction: In each of the Following questions, two statements are given. One is assertion and the other is reason. Examine the statement carefully and mark the correct answer according to the instruction given below

Assertion For higher temperature, the peak emission wavelength of a black body shifts to lower wavelength.
Reason Peak emission wavelength of a blackbody is proportional to the fourth power of temperature.

Question 8

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?