1.

A parallel beam of monochromatic light of wavelength 460 nm passes through a long slit of width 0.1 mm. What is the angular divergence in which most of the light is diffracted?

• 2.3×10^-3 rad
• 4.6×10^-3 rad
• 9.2×10^-3 rad
• 9.2×10^-6 rad

2.

The correct mathematical expression for amplitude modulated wave is:

• A_csinω_ct
• A_msinω_mt
• (A_C+ A_msinω_mt)sinω_Ct
• (A_Csinω_Ct + A_msinω_mt

3.

Read the below paragraph carefully answer the question :
Case study
Poverty has many faces, which have been changing from place to place and across time and has been described in many ways. In pre-independent India, Dadabhai Naoroji was first to discuss the concept of poverty line. In post-independent India, there have been several attempts to work out a mechanism to identify the number of poor in the country. The official data on poverty is made to the public by the planning commission. It is estimated on the basis of consumption expenditure data collected by the National Sample Survey organisation. Most poverty alleviation programmes implemented are based on the perspective of the five year plans. The government has a variety of programmes to generate wage employment for the poor unskilled people living in rural area.

4.

What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen atom spectrum lines?
(Take h=6.63×10^-34Js; c=3×10⁸ ms^-1; e=1.6×10^-19C)

• 122nm
• 12.2nm
• 1.22nm
• 10.2nm

5.

Energy band gap is maximum in:

• metals
• semi-conductor
• super conductor
• insulator

6.

The forbidden energy gaps in conductors, semiconductors and insulators are (E_g)_c, (E_g)_s and (E_g)₁ respectively. What is the relation among them ?

• (E_g)_c < (E_g)_s < (E_g)_t
• (E_g)_c > (E_g)_s > (E_g)_t
• (E_g)_c < (E_g)_s > (E_g)_t
• (E_g)_c = (E_g)_s > (E_g)_t