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. The dimension of coefficient of viscosity is
൧) 14൬ 8) 14൩ C) ۱۸۳٦٢ ഉ) 14൬2

. The radioactive element Neptunium (9,Np2°9) emits which particle to form
Plutonium

A) o particle 8) B particle C) y particle D) positron

. Which of the following is true in the case of hexagonal crystal systems ?
4) 8 = 0 = 0, ५ = § = 90°, 1205 8) 8 = 0 =©, ५ = 8 =+ = 90°
©) 80 ‏ع برع 8 ع به ره عع‎ 90“ D) azb¥c,a=fp=90%y

. In the case of L— S coupling scheme when L > S, J can have
A) (2S +L) values B) (2L + 1) values
C) (2L +S) values D) (2S + 1) values

. Lyman spectral series of hydrogen atom lies in which region of the electromagnetic
spectrum ?
A) Ultraviolet region B) Infra-Red region
C) Visible region D) Radio waves

. Which of the following are not the conditions to produce Haidinger fringes ?
i. The source must be an extended source.
ii. The source must be a narrow source.
iii. The film thickness must be appreciably large.
iv. The film thickness must be very small.
v. The observing instrument is to be focused for parallel rays.
A) Only (i, iii and iv) B) Only (ii, iv and v)
C) Only (ii and iv) D) Only (iv and v)

. Which of the following statements are correct in accordance with the first law of
Thermodynamics ?
i. It is applicable to any process by which a system undergoes a physical
change.
ii. It is applicable to any process by which a system undergoes a chemical
change .

iii. It introduces the concept of internal energy.
iv. It does not provide a method for determining the change in internal energy.
A) i, ji and iii B) i, ili and iv C) i, ii and iv D) ii, iii and iv