21,

22,

23,

24,

25,

26.

27,

28,

29,

DNA model was proposed by Watson and Crick in the year :
(ಹಿ) 1970 (B) 1953 © 1983 (D) 1965

Which statement of cell cycle is not true ?

(ಹ) It consists of mitosis and interphase

(3) The cell's DNA replicates during G1

(ಲ) A cell can remain in G1 for weeks or even longer

(D) Most proteins are formed throughout all subphase of interphase

The element with atomic number Z=115 will be placed in :
A) 7% period, I A grouj (B) 8% period, IV A grou
7 group ற்‌ group
C) 7t period, VA grou, D) 6 period, VB தாயு
7 group ற்‌ group

Half-life period of a radioactive element X is same as the mean life time of another element Y.
Initially, they have same number of atoms. Then :

(ಹಿ) Xwill decay faster than Y

(B) Y will decay faster than X

(C) Y and X decay at the same rate after one half-life period
(D) Y and X have same decay rate initially

The difference between soft and hard X-rays is of :
(A) Velocity (8) Intensity (ಲ) Frequency (D) Polarization

Which rays are not the portion of electro-magnetic spectrum ?
(^) Alpha-rays (B) X-rays (C) Microwaves (D) Radiowaves

Whose experiments mark the beginning of the field of communication using electromagnetic
waves रे

(A) 1.2. 8056 (8) Maxwell (C) Marconi (D) Hertz

The correct sequence of the increasing wavelength of the given radiation sources is :
(ಹ) Radioactive sources, X-ray tube, crystal oscillator, sodium vapour lamp
(8) Radioactive sources, X-ray tube, sodium vapour lamp, crystal oscillator
(ಲ) X-ray tube, radioactive sources, crystal oscillator, sodium vapour lamp
(D) X-ray tube, crystal oscillator, radioactive sources, sodium vapour lamp

What is the range of frequency for ultrasonic wave ?
(ಹಿ) 1kHz (B) 5kHz © 580 ‏عتما‎ (D) 100 ‏عتما‎

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