1.

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

2.

Energy band gap is maximum in:

• metals
• semi-conductor
• super conductor
• insulator

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.

Which of the following statements are correct?
(A) The resistivity of a semiconductor decreases with increasing temperature.
(B) The potentiometer is unaffected by the internal resistance of the source.
(C) In ionic crystals and electrolytic liquids electrons carry the electric current.
(D) Ohm's law fails if V depends on I non-linearly.
(E) Kirchhoff's rules are used for analysis of electric circuits.
Choose the correct answer from the options given below:

• (B), (C) and (E) only
• (A), (B), (D) and (E) only
• (C), (D) and (E) only
• (A), (C) and (D) only

5.

We are the organizers. We __ welcome the guests.

6.

A radioactive isotope phosphorous-32 has an initial activity 10μCi and has half life of 14 days. What is the activity of the source after 42 days?

• 1.25μCi
• 2.5μCi
• 5μCi
• 0.625μCi