70.

71.

72.

73.

74,

75.

76.

The ideal timing of radiotherapy for Wilms Tumour after surgery is :
(ಹಿ) Within 10 days (B) Within 2 weeks
(9) Within 3 weeks (D) Anytime after surgery

Half-life of Technetium 99 is :
(ಹ) 2 hours (B) 6 hours (ಲ) 12 hours (D) 24 hours

Radiation damage is divided into (a) lethal damage, (b) sublethal damage and (c) potentially
lethal damage (PLD). Which of the following statements is true ?

(ಹ) PLD will cause cell death under ordinary circumstances.

(3) PLD cannot be repaired under ordinary circumstances.

(ಲ) The variation of postirradiation conditions cannot enhance PLD repair.

(D) PLD repair is less likely to occur when mitosis is delayed.

Which of the following statements is false ?
(ಹಿ) Radiation damage can cause a cell to either die or continue being viable but mutated.

(8) The two events above are very different when it comes to the dose dependence of their
probability to occur and also when it comes to their impact on the organism to which
the cell belongs.

(ಲ) Cell killing by radiation 15 said to be a “deterministic effect”.
)0( mutating by radiation is said to be a “nonstochastic effect”.

The average effective dose from medical radiation is about :

(5) The same as the dose from natural background radiation.

(B) The same as the dose from natural background radiation excluding radon.
(ಲ) Half of the total effective dose.

(D) One third of the total effective dose.

In the percent-labeled mitoses technique, the time interval before any mitotic cells appear
gives the duration of :

(A) TheSphase (B) TheG,phase (C) TheG,phase (D) The M phase

Which of the following statements is false ?

(A) By “cataract” is denoted any detectable change in the normally transparent lens of the
eye.

(8) Cataracts can be caused by irradiation of the lens.

(ಲ) Cell division in the lens continues throughout life.

(D) The lens has the same mechanisms for cell removal as other normal tissues.

11 072/2017
{P.T.O}